https://www.hfunderground.com/wiki/index.php?title=FM&feed=atom&action=historyFM - Revision history2024-03-29T04:51:33ZRevision history for this page on the wikiMediaWiki 1.16.5https://www.hfunderground.com/wiki/index.php?title=FM&diff=16047&oldid=prevR4002 at 16:09, 6 March 20242024-03-06T16:09:36Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</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>
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</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=16046&oldid=prevR4002 at 16:08, 6 March 20242024-03-06T16:08:46Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. Phase modulation (PM) produces the same end result and uses the emission designator G3 / G3E for phase modulated voice. Some radio services, such as [[VHF_marine|VHF marine]], use the G3E emission for FM voice - 16K0G3E instead of the F3E designation. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. Phase modulation (PM) produces the same end result and uses the emission designator G3 / G3E for phase modulated voice. Some radio services, such as [[VHF_marine|VHF marine]], use the G3E emission for FM voice - 16K0G3E instead of the F3E designation. </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>WFM or WBFM is used worldwide on the FM broadcast band, which varies from country to country. The 88-108 MHz band (87.7 MHz to 107.9 MHz) is the de facto standard. Other standards, like the Japanese band or the [[OIRT]] band used in former Soviet bloc countries (former USSR, the CIS, etc.) WFM usually has a 75 kHz bandwidth and multiple sub-carriers. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>WFM or WBFM is used worldwide on the FM broadcast band, which varies from country to country. The 88-108 MHz band (87.7 MHz to 107.9 MHz) is the de facto standard. Other standards, like the Japanese band or the [[OIRT]] band <ins class="diffchange diffchange-inline">65 MHz - 74 MHz </ins>used in former Soviet bloc countries (former USSR, the CIS, etc.) WFM usually has a 75 kHz bandwidth and multiple sub-carriers. <ins class="diffchange diffchange-inline">The Japanese FM band used to be allocated the 76 MHz to 90 MHz spectrum, it is now 76 MHz - 95 MHz. </ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=16044&oldid=prevR4002: /* Frequency Modulation */2024-03-06T16:07:02Z<p><span class="autocomment">Frequency Modulation</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</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><del style="color: red; font-weight: bold; text-decoration: none;">Efff emmmm</del></div></td><td colspan="2"> </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>
<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;">No static at all</del></div></td><td colspan="2"> </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;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. Phase modulation (PM) produces the same end result and uses the emission designator G3 / G3E for phase modulated voice. Some radio services, such as [[VHF_marine|VHF marine]], use the G3E emission for FM voice - 16K0G3E instead of the F3E designation. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. Phase modulation (PM) produces the same end result and uses the emission designator G3 / G3E for phase modulated voice. Some radio services, such as [[VHF_marine|VHF marine]], use the G3E emission for FM voice - 16K0G3E instead of the F3E designation. </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;">WFM or WBFM is used worldwide on the FM broadcast band, which varies from country to country. The 88-108 MHz band (87.7 MHz to 107.9 MHz) is the de facto standard. Other standards, like the Japanese band or the [[OIRT]] band used in former Soviet bloc countries (former USSR, the CIS, etc.) WFM usually has a 75 kHz bandwidth and multiple sub-carriers. </ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=16043&oldid=prevR4002 at 16:04, 6 March 20242024-03-06T16:04:56Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</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;">Efff emmmm</ins></div></td></tr>
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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;">No static at all</ins></div></td></tr>
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</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=16039&oldid=prevR4002: /* Frequency Modulation */2024-03-02T16:40:01Z<p><span class="autocomment">Frequency Modulation</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as FMN, NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as FMN, NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </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>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E<ins class="diffchange diffchange-inline">. Phase modulation (PM) produces the same end result and uses the emission designator G3 / G3E for phase modulated voice. Some radio services, such as [[VHF_marine|VHF marine]], use the G3E emission for FM voice - 16K0G3E instead of the F3E designation</ins>. </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=15981&oldid=prevR4002 at 14:37, 22 February 20242024-02-22T14:37:03Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</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><del class="diffchange diffchange-inline">'''FM, no static at all...no static at all.'''</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </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>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=15980&oldid=prevR4002 at 14:36, 22 February 20242024-02-22T14:36:55Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Frequency Modulation ==</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 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;">'''FM, no static at all...no static at all.'''</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>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </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>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz <ins class="diffchange diffchange-inline">11 meter </ins>[[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </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>FM (in the form of narrow FM, also known as FMN, NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as FMN, NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=15974&oldid=prevR4002: /* Frequency Modulation */2024-02-22T14:32:36Z<p><span class="autocomment">Frequency Modulation</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </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>FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as <ins class="diffchange diffchange-inline">FMN, </ins>NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF [[VHF_/_UHF_Radio|bands]]. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </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>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. </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>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=15973&oldid=prevR4002: /* Frequency Modulation */2024-02-22T14:32:20Z<p><span class="autocomment">Frequency Modulation</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 14:32, 22 February 2024</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 6:</td>
<td colspan="2" class="diff-lineno">Line 6:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the [[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|10 meter]] band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </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>FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF bands. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF <ins class="diffchange diffchange-inline">[[VHF_/_UHF_Radio|</ins>bands<ins class="diffchange diffchange-inline">]]</ins>. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </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>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM mode is also known by its [[Emission Designator|emission]] designation F3 or F3E. </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>[[Category: Transmission modes]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category: Transmission modes]]</div></td></tr>
</table>R4002https://www.hfunderground.com/wiki/index.php?title=FM&diff=15972&oldid=prevR4002: /* Frequency Modulation */2024-02-22T14:31:41Z<p><span class="autocomment">Frequency Modulation</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 14:31, 22 February 2024</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 4:</td>
<td colspan="2" class="diff-lineno">Line 4:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>With FM, the carrier frequency is [[Emission Designator|modulated]] by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than [[AM]] when the received signal is strong, but worse quality under poor reception conditions. </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>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the 10 meter band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>It is rarely used on [[HF]] frequencies, with the exception of 27 MHz [[CB]] operators in [[11_meter#Freeband_11_Meter_and_CB_Calling_Frequencies_Channels|many countries]] - [[CB#US_.22FCC.22_.22CEPT.22_or_.22mid_band.22_CB_Frequencies|often in conjunction]] with AM and [[SSB]], [[amateur radio]] operators using the FM in the <ins class="diffchange diffchange-inline">[[Amateur_radio#Amateur_Radio_Bands_MF.2FHF|</ins>10 meter<ins class="diffchange diffchange-inline">]] </ins>band, [[Business_Radio|land mobile radio users]] operating on a small number of channelized frequencies in the 25 to 30 MHz [[11_meter|range]] and some specialized maritime mobile (marine radio) [[CB#China.2FHong_Kong_Chinese_27.5-39.5_MHz_HF_and_VHF-low_Fishery_Marine_Band_FM_Fishing_Radio|systems]] used by fishing fleets, fishery radio networks, etc. </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>FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF bands. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF bands. Different services have different [[FCC|regulations]] regarding deviation limits, bandwidth, etc. for FM voice use worldwide. </div></td></tr>
</table>R4002