https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&feed=atom&action=historyCommon and Precious 3 - Revision history2024-03-29T13:06:22ZRevision history for this page on the wikiMediaWiki 1.16.5https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=15675&oldid=prevR4002: /* Circuit Notes */2023-12-27T23:49:58Z<p><span class="autocomment">Circuit Notes</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The circuit is done the classic way in full Transistor (all 2N3904) topology. A standard (series) pulled crystall oscillator circuit provides the source signal. It's followed by a buffer stage that has a parallel resonant tank circuit in it's collector path. The tank circuit is tuned to twice the driving frequency. The doubled signal needs some addional filtering. The amplitide of each added sine swing is weaker than the swing that goes with the fundamental frequency. Therefore, the imbalanced singal is feed to a resonant filter stage existing of three series resonant tanks which happen to be coupled with a small capcitance. The Signal at it's output is <del class="diffchange diffchange-inline">verry </del>smooth and shows a steady amplitude. This, now clean, signal is amplified once more before feed to the PA driver stage. Impedance matching between the last amplifier stage and the PA driver Transistor is realised with a small transformer (binocular ferrite core). The driver stage uses a 2N3866 with heatsink in class B mode. It delivers approx 1,5W. The final driver stage operates in class C mode and uses a 2SC2078 RF power Transistor (which was designed for use in 11m Band devices like CB radios). Therefore, it works well here and provides approx 8W RF when running at 14V.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The circuit is done the classic way in full Transistor (all 2N3904) topology. A standard (series) pulled crystall oscillator circuit provides the source signal. It's followed by a buffer stage that has a parallel resonant tank circuit in it's collector path. The tank circuit is tuned to twice the driving frequency. The doubled signal needs some addional filtering. The amplitide of each added sine swing is weaker than the swing that goes with the fundamental frequency. Therefore, the imbalanced singal is feed to a resonant filter stage existing of three series resonant tanks which happen to be coupled with a small capcitance. The Signal at it's output is <ins class="diffchange diffchange-inline">very </ins>smooth and shows a steady amplitude. This, now clean, signal is amplified once more before feed to the PA driver stage. Impedance matching between the last amplifier stage and the PA driver Transistor is realised with a small transformer (binocular ferrite core). The driver stage uses a 2N3866 with heatsink in class B mode. It delivers approx 1,5W. The final driver stage operates in class C mode and uses a 2SC2078 RF power Transistor (which was designed for use in 11m Band devices like CB radios). Therefore, it works well here and provides approx 8W RF when running at 14V.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A 7 Pole (triple) PI filter ensures harmonics supression that meets the official requirements. Mind: just because you do not-so-legal stuff doesn't mean you need to be lazy and annoy people with harmonics. Be nice and thoughtful. Try not to bug people. Choose your frequency with care and make sure your signal is all clean.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A 7 Pole (triple) PI filter ensures harmonics supression that meets the official requirements. Mind: just because you do not-so-legal stuff doesn't mean you need to be lazy and annoy people with harmonics. Be nice and thoughtful. Try not to bug people. Choose your frequency with care and make sure your signal is all clean.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A 7805 fixed voltage regulator provides +5V DC to the Atmel AVR ATTiny25 which generates the morse signal. Keying takes place in the last amplifier stage that drives the 2N3866. The 2N3904 is keyed by using a PNP Transistor (BC557) in it's collector path. Turning on and off the +12VDC and therefore the RF that drives the PA.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A 7805 fixed voltage regulator provides +5V DC to the Atmel AVR ATTiny25 which generates the morse signal. Keying takes place in the last amplifier stage that drives the 2N3866. The 2N3904 is keyed by using a PNP Transistor (BC557) in it's collector path. Turning on and off the +12VDC and therefore the RF that drives the PA.</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Two LEDs (power = green, key = orange) provide information about the status. The whole board is fit into an old weather proof aluminium chassis. The 2SC2078 is mounted (insulated) to the chassis, providing cooling. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Two LEDs (power = green, key = orange) provide information about the status. The whole board is fit into an old weather proof aluminium chassis. The 2SC2078 is mounted (insulated) to the chassis, providing cooling.</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Antenna Notes ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Antenna Notes ==</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=15417&oldid=prevR4002: /* Summary */2023-08-14T15:40:03Z<p><span class="autocomment">Summary</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>- Frequency: 26510 kHz 26,510 kHz 26.510 MHz (rarely used [[CB#Russian_CB_Channel_Frequencies|CB frequency]])</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>- Frequency: 26510 kHz 26,510 kHz 26.510 MHz (<ins class="diffchange diffchange-inline">[[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|26 MHz / 27 MHz beacon frequency]] and </ins>rarely used [[CB#Russian_CB_Channel_Frequencies|CB frequency]])</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified [[CB]] antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified [[CB]] antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=15415&oldid=prevR4002 at 15:38, 14 August 20232023-08-14T15:38:39Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>- Frequency: 26510 kHz 26,510 kHz 26.510 MHz </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>- Frequency: 26510 kHz 26,510 kHz 26.510 MHz <ins class="diffchange diffchange-inline">(rarely used [[CB#Russian_CB_Channel_Frequencies|CB frequency]])</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified [[CB]] antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified [[CB]] antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=8279&oldid=prevR4002: /* Summary */2019-02-22T20:00:43Z<p><span class="autocomment">Summary</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Power: 7W</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified CB antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">- Frequency: 26510 kHz 26,510 kHz 26.510 MHz </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>- Antenna: 5/8λ Vertical (modified <ins class="diffchange diffchange-inline">[[</ins>CB<ins class="diffchange diffchange-inline">]] </ins>antenna) on a roof, approx 10m above the ground (1,5m above the roof).</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- System: Pulled 13.256kHz X-Tal with doubler stage. Uses 3x 2N3904 for oscillator, doubler and buffer. Uses 2N2866 for Driver and 2SC2078 in the PA.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- System: Pulled 13.256kHz X-Tal with doubler stage. Uses 3x 2N3904 for oscillator, doubler and buffer. Uses 2N2866 for Driver and 2SC2078 in the PA.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Record: 1.094km to Chester, Cheshire, UK (WebSDR, 19. of June 2017)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Record: 1.094km to Chester, Cheshire, UK (WebSDR, 19. of June 2017)</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== History ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== History ==</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6998&oldid=prevZazzle at 09:00, 24 November 20172017-11-24T09:00:00Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== History ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== History ==</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>{| width="100%" border="1" cellspacing="0" cellpadding="2" align="left" style="border: #969696; border-collapse: collapse; margin: <del class="diffchange diffchange-inline">50px</del>;"</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>{| width="100%" border="1" cellspacing="0" cellpadding="2" align="left" style="border: #969696; border-collapse: collapse; margin: <ins class="diffchange diffchange-inline">0px 0px 30px 0px</ins>;"</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>! Date !! Issue</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>! Date !! Issue</div></td></tr>
</table>Zazzlehttps://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6997&oldid=prevZazzle at 08:58, 24 November 20172017-11-24T08:58:47Z<p></p>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== History ==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">{| width="100%" border="1" cellspacing="0" cellpadding="2" align="left" style="border: #969696; border-collapse: collapse; margin: 50px;"</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">! Date !! Issue</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|- </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| May 2015 || Project kick-off. Evaluating the setup and loacation.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| June 2016 || First prototype of a 500mW version.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| September 2016 || First prototype of a 7W version.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| October 2016 || Clean and stable version of the 7W prototype.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| June 2017 || Antenna construction and setup. Deployment and begin of operation.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| August 2017 || Operation interrupted for about two weeks due to power loss inflicted by rats s gnawing through the mains wires.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">| September 2017 || Operation interrupted for about three weeks due to massive antenna damage inflicted by a heavy storm.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">|}</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"><br /><br /></ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td></tr>
</table>Zazzlehttps://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6878&oldid=prevZazzle at 21:08, 20 June 20172017-06-20T21:08:54Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Keying: Atmel AVR ATTiny25</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- Keying: Atmel AVR ATTiny25</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>- Uses two 7 pole (<del class="diffchange diffchange-inline">tripple </del>PI) filter for harmonics supression.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>- Uses two 7 pole (<ins class="diffchange diffchange-inline">triple </ins>PI) filter for harmonics supression.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- System effiency is approx 70%</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>- System effiency is approx 70%</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Circuit Notes ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The circuit is done the classic way in full Transistor (all 2N3904) topology. A standard (series) pulled crystall oscillator circuit provides the source signal. It's followed by a buffer stage that has a parallel resonant tank circuit in it's collector path. The tank circuit is tuned to twice the driving frequency. The doubled signal needs some addional filtering. The amplitide of each added sine swing is weaker than the swing that goes with the fundamental frequency. Therefore, the imbalanced <del class="diffchange diffchange-inline">singla </del>is feed to a resonant filter stage existing of three series resonant tanks which happen to be coupled with a small capcitance. The Signal at it's output is verry <del class="diffchange diffchange-inline">smoth </del>and shows a steady amplitude. This, now clean, signal is amplified once more before feed to the PA driver stage. Impedance matching between the last amplifier stage and the PA driver Transistor is realised with a small transformer (binocular <del class="diffchange diffchange-inline">ferrit </del>core). The driver stage uses a 2N3866 with heatsink in class B mode. It delivers approx 1,5W. The final driver stage operates in class C mode and uses a 2SC2078 RF power Transistor (which was designed for use in 11m Band devices like CB radios). Therefore, it works well here and provides approx 8W RF when running at 14V.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The circuit is done the classic way in full Transistor (all 2N3904) topology. A standard (series) pulled crystall oscillator circuit provides the source signal. It's followed by a buffer stage that has a parallel resonant tank circuit in it's collector path. The tank circuit is tuned to twice the driving frequency. The doubled signal needs some addional filtering. The amplitide of each added sine swing is weaker than the swing that goes with the fundamental frequency. Therefore, the imbalanced <ins class="diffchange diffchange-inline">singal </ins>is feed to a resonant filter stage existing of three series resonant tanks which happen to be coupled with a small capcitance. The Signal at it's output is verry <ins class="diffchange diffchange-inline">smooth </ins>and shows a steady amplitude. This, now clean, signal is amplified once more before feed to the PA driver stage. Impedance matching between the last amplifier stage and the PA driver Transistor is realised with a small transformer (binocular <ins class="diffchange diffchange-inline">ferrite </ins>core). The driver stage uses a 2N3866 with heatsink in class B mode. It delivers approx 1,5W. The final driver stage operates in class C mode and uses a 2SC2078 RF power Transistor (which was designed for use in 11m Band devices like CB radios). Therefore, it works well here and provides approx 8W RF when running at 14V.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>A 7 Pole (<del class="diffchange diffchange-inline">tripple</del>) PI filter ensures harmonics supression that meets the official requirements. Mind: just because you do not-so-legal stuff doesn't mean you need to be lazy and annoy people with harmonics. Be nice and thoughtful. Try not to bug people. Choose your frequency with care and make sure your signal is all clean.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>A 7 Pole (<ins class="diffchange diffchange-inline">triple</ins>) PI filter ensures harmonics supression that meets the official requirements. Mind: just because you do not-so-legal stuff doesn't mean you need to be lazy and annoy people with harmonics. Be nice and thoughtful. Try not to bug people. Choose your frequency with care and make sure your signal is all clean.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>A 7805 fixed voltage regulator provides +5V DC to the Atmel AVR ATTiny25 which generates the morse signal. Keying takes place in the last amplifier stage that drives the 2N3866. The 2N3904 is keyed by using a PNP Transistor (BC557) in it's <del class="diffchange diffchange-inline">collecor </del>path. Turning on and off the +12VDC and <del class="diffchange diffchange-inline">thefore </del>the RF that drives the PA.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>A 7805 fixed voltage regulator provides +5V DC to the Atmel AVR ATTiny25 which generates the morse signal. Keying takes place in the last amplifier stage that drives the 2N3866. The 2N3904 is keyed by using a PNP Transistor (BC557) in it's <ins class="diffchange diffchange-inline">collector </ins>path. Turning on and off the +12VDC and <ins class="diffchange diffchange-inline">therefore </ins>the RF that drives the PA.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Two LEDs (power = green, key = orange) provide information about the status. The whole board is fit into an old weather proof aluminium chassis. The 2SC2078 is mounted (insulated) to the chassis, providing cooling. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Two LEDs (power = green, key = orange) provide information about the status. The whole board is fit into an old weather proof aluminium chassis. The 2SC2078 is mounted (insulated) to the chassis, providing cooling. </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>All other ''Common and Precious Beacons'' operate with 1/2λ dipoles. Given that the site (roof) offers enough space, it was the best decision. Other antenna types easily become tricky to mount or don't have a good efficiency. Staying undercover is also a point here.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>All other ''Common and Precious Beacons'' operate with 1/2λ dipoles. Given that the site (roof) offers enough space, it was the best decision. Other antenna types easily become tricky to mount or don't have a good efficiency. Staying undercover is also a point here.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>An old CB antenna was choosen for this project. It sat in the basement for almost 15 years. Primary because it was already pretty weather worn and corroded. But it was still enough for such a project. The foot (with <del class="diffchange diffchange-inline">it's it's </del>socket) got torn apart. After some experiements a new impedance matching curcuit was installed in it's base. It's an inductor on a <del class="diffchange diffchange-inline">ferrit </del>core that fulfills two requirements: providing an inductive reactance (which compensates the capacitive inductance the antenna inhibits) and providing impedance matching (approx 30R to 50R).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>An old CB antenna was choosen for this project. It sat in the basement for almost 15 years. Primary because it was already pretty weather worn and corroded. But it was still enough for such a project. The foot (with <ins class="diffchange diffchange-inline">its </ins>socket) got torn apart. After some experiements a new impedance matching curcuit was installed in it's base. It's an inductor on a <ins class="diffchange diffchange-inline">ferrite </ins>core that fulfills two requirements: providing an inductive reactance (which compensates the capacitive inductance the antenna inhibits) and providing impedance matching (approx 30R to 50R).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In addition, long ground radial were added. Those are made of simple insulated flexible wire. Four radials, approx 5m each. The SWR is approx 1:1.05, which is excellent.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In addition, long ground radial were added. Those are made of simple insulated flexible wire. Four radials, approx 5m each. The SWR is approx 1:1.05, which is excellent.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Notes ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Notes ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>There's only one way to describe this project: "''<del class="diffchange diffchange-inline">Ops</del>, this <del class="diffchange diffchange-inline">escallated </del>quick...''". The basic wish was to build a classic full transistor Transmitter that uses frequency multiplication like it was done in the old days. So far so good. But the project soon escallated when it comes to output power. The project was designed to deliver 500mW, with the intention to operate it with a solar module and Battery pack. That's reasonable for a project in the 11m Band. DXin on this band is only possible during daytime (plus approx one hour before and after sunset). So there's no use in operateing at night. In the end it wasn't 500mW but approx 8W. Why? Well, tinkerer's disease struck. In particular: "''Hmm, let's see how far I can get with standard parts and reasonable efforts''". Well. you know the outcome now. :)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>There's only one way to describe this project: "''<ins class="diffchange diffchange-inline">Oops</ins>, this <ins class="diffchange diffchange-inline">escalated </ins>quick...''". The basic wish was to build a classic full transistor Transmitter that uses frequency multiplication like it was done in the old days. So far so good. But the project soon escallated when it comes to output power. The project was designed to deliver 500mW, with the intention to operate it with a solar module and Battery pack. That's reasonable for a project in the 11m Band. DXin on this band is only possible during daytime (plus approx one hour before and after sunset). So there's no use in operateing at night. In the end it wasn't 500mW but approx 8W. Why? Well, tinkerer's disease struck. In particular: "''Hmm, let's see how far I can get with standard parts and reasonable efforts''". Well. you know the outcome now. :)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Pictures ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Pictures ==</div></td></tr>
</table>Zazzlehttps://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6877&oldid=prevZazzle at 11:35, 19 June 20172017-06-19T11:35:21Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Single.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Single.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Chassis.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Chassis.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">[[File:11M-CaP-Pole-SWR.jpg|left|240px]]</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Antenna-Matching.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Antenna-Matching.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Lookup.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Lookup.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:11M-CaP-Pole-SWR.jpg|left|240px]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:CaP-Chester-Cheshire-UK-WebSDR-19.06.2017.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:CaP-Chester-Cheshire-UK-WebSDR-19.06.2017.jpg|left|240px]]</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Beacons]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Beacons]]</div></td></tr>
</table>Zazzlehttps://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6876&oldid=prevZazzle at 11:33, 19 June 20172017-06-19T11:33:55Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Chassis.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Board-Chassis.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-SWR.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-SWR.jpg|left|240px]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:11M-CaP-Antenna-Matching.jpg|left|240px]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Lookup.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Lookup.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td></tr>
</table>Zazzlehttps://www.hfunderground.com/wiki/index.php?title=Common_and_Precious_3&diff=6874&oldid=prevZazzle at 10:58, 19 June 20172017-06-19T10:58:58Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:11M-CaP-Pole-Antenna-Sidelook.jpg|left|240px]]</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>CaP-Chester-Cheshire-UK-WebSDR-19.06.2017.jpg</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[File:</ins>CaP-Chester-Cheshire-UK-WebSDR-19.06.2017.jpg<ins class="diffchange diffchange-inline">|left|240px]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Beacons]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Beacons]]</div></td></tr>
</table>Zazzle