HFU HF Underground
Loggings => 22 Meter Band HiFER Beacons => Topic started by: Beerus Maximus on January 26, 2018, 0103 UTC
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BEER is a Black Cat Systems 22m beacon kit (see: https://blackcatsystems.com/rf-products/22_meter_band_part_15_beacon_kit.html) 13566 is the area-ish.
It is assembled and on the air, transmitting from the Boston suburbs. As of 1/25/2018 the antenna is an end-fed 20M dipole not far off the ground. It is outdoors, but not far above the ground right now. Not entirely ideal, but it's possible someone may hear this beacon. Antenna improvements when the weather is warmer.
Valid reception reports will be rewarded with a nice printed QSL card. Submit reports to: beerusmaximus@gmail.com. An audio recording, SDR capture, or legitimate waterfall screen scrape will get you a card. Note, a postal mailing address is required to receive a card.
Once again, target frequency is 13566.0-ish.
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Any luck yet? I've tried a couple of times but it's nothing but a buzz saw of noise here in that region of the band.
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No reports yet. The beacon is on the air 24/7.
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I have been listening for it...in time it will show up in Colorado is my guess.
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Just wondering, how is a dipole "end fed"?
BEER is a Black Cat Systems 22m beacon kit (see: https://blackcatsystems.com/rf-products/22_meter_band_part_15_beacon_kit.html) 13560.720 is the area-ish.
It is assembled and on the air, transmitting from the Boston suburbs. As of 1/25/2018 the antenna is an end-fed 20M dipole not far off the ground. It is outdoors, but not far above the ground right now. Not entirely ideal, but it's possible someone may hear this beacon. Antenna improvements when the weather is warmer.
Valid reception reports will be rewarded with a nice printed QSL card. Submit reports to: beerusmaximus@gmail.com. An audio recording, SDR capture, or legitimate waterfall screen scrape will get you a card. Note, a postal mailing address is required to receive a card.
Once again, target frequency is 13560.720-ish.
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Just wondering, how is a dipole "end fed"?
With a tuning fork.
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Just wondering, how is a dipole "end fed"?
A dipole is considered to be such when the total length of the radiating elements are a half wavelength at the frequency of operation. If fed in the middle (where current is max and voltage is min) you get a low impedance wich is suited for coax. If fed on the end (where voltage is max and current is min) you see around 2k ohms impedance, a considerable hurdle for coax matching that will require a transformer to efficiently transfer power from coax to antenna or vice versa. End feed sometimes exacerbates rfi issues in the shack, but ferrites placed on the feed line can mitigate these unwanted effects.
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FYI.... there is no such thing as an "end fed dipole". A dipole is center fed. An end fed wire is not a "dipole".
The exception being an O.C.F. dipole (G5RV).
The impedance at the feedpoint of an end fed wire depends on the length of the wire and frequency of operation, not just "2k ohms" ;)
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BEER is off the air. The house cleaners took some extra liberties with my shack and somehow managed to destroy the beacon. Looks like the power cable got tangled in a vacuum and the board beaten up in the bristles. My bad for not getting it into a box and tucked away.
Hopefully back on the air soon when I can affect some repairs.
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Just wondering, how is a dipole "end fed"?
With a tuning fork.
LMAO!
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BEER is off the air. The house cleaners took some extra liberties with my shack and somehow managed to destroy the beacon. Looks like the power cable got tangled in a vacuum and the board beaten up in the bristles. My bad for not getting it into a box and tucked away.
Hopefully back on the air soon when I can affect some repairs.
This post requires pics.
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FYI.... there is no such thing as an "end fed dipole". A dipole is center fed. An end fed wire is not a "dipole".
The exception being an O.C.F. dipole (G5RV).
The impedance at the feedpoint of an end fed wire depends on the length of the wire and frequency of operation, not just "2k ohms" ;)
A dipole is usually taken to be 1/2 wave long for the frequency in question, and the ends see around 2k ohms z.
:D
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Again, a DIPOLE is center fed, not end fed. You are confusing an end fed wire with a dipole.
FYI.... there is no such thing as an "end fed dipole". A dipole is center fed. An end fed wire is not a "dipole".
The exception being an O.C.F. dipole (G5RV).
The impedance at the feedpoint of an end fed wire depends on the length of the wire and frequency of operation, not just "2k ohms" ;)
A dipole is usually taken to be 1/2 wave long for the frequency in question, and the ends see around 2k ohms z.
:D
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Hope this could be a response to the dispute in the subject antennas :)
http://www.eham.net/ehamforum/smf/index.php?topic=95835.0
//QRP
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And again, incorrectly stated several times by some hams that don't know any better in that discussion, an "END FED WIRE" is not a "DIPOLE" and there is no such thing as an "END FED DIPOLE"
Here's the definition of a "Dipole"
"A dipole antenna is the simplest type of radio antenna, consisting of a conductive wire rod that is half the length of the maximum wavelength the antenna is to generate. This wire rod is split in the middle, and the two sections are separated by an insulator."
Notice the "middle" reference? A wire that is fed at the end is, an "End fed wire" antenna.
Another one = "A dipole antenna is a straight electrical conductor measuring 1/2 wavelength from end to end and connected at the center to a radio-frequency (RF) feed line"
Hope this could be a response to the dispute in the subject antennas :)
http://www.eham.net/ehamforum/smf/index.php?topic=95835.0
//QRP
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Wow.... sorry to hear that. I'm glad I clean my own shack, too much stuff to break to let someone else do it. :P :P
Please let us know when it's back on the air. 8)
BEER is off the air. The house cleaners took some extra liberties with my shack and somehow managed to destroy the beacon. Looks like the power cable got tangled in a vacuum and the board beaten up in the bristles. My bad for not getting it into a box and tucked away.
Hopefully back on the air soon when I can affect some repairs.
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And the responses of a halfwave antenna operating at the frequency of resonance, "dipole" or end fed, are exactly the same, radiation angles, the same current and voltage minima and maxima at the same points along the length of radiator, etc.
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Just by listening to a radio transmitter, you can not determine how the antenna is fed. The most important thing is that the signal reaches your receiver so you can hear it and the rest is irrelevant.
Keep going BEER!
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You're wrong but I understand, you want to call an apple a pear. No problem! ::) ::) ::)
... but back to the original post, there is no such thing as an end fed dipole.
And the responses of a halfwave antenna operating at the frequency of resonance, "dipole" or end fed, are exactly the same, radiation angles, the same current and voltage minima and maxima at the same points along the length of radiator, etc.
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BEER is back on the air. I added a cap at C16 to move the freq up. BEER is now at 13566 KHz.
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Great to hear it Beer... I'll shut my beacon off this weekend and give a listen.
BEER is back on the air. I added a cap at C16 to move the freq up. BEER is now at 13566 KHz.
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Later this spring/summer I'll get a properly nourished antenna in the air for this beacon. But I'm hoping someone might be able to catch it as it is now.
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This was starting to reach the level of the JTA-Radio Bob battle over whether a dipole was a balanced or unbalanced antenna. I don't think anyone gave a crap but those two? They certainly proved they were unbalanced for arguing about it the way they did.
That little episode was the birth of a decade plus of on and off "Pirate Wars".
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It's all good!. Changing word meanings is fun! ;D
This was starting to reach the level of the JTA-Radio Bob battle over whether a dipole was a balanced or unbalanced antenna. I don't think anyone gave a crap but those two? They certainly proved they were unbalanced for arguing about it the way they did.
That little episode was the birth of a decade plus of on and off "Pirate Wars".
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Is that foam from an IPA in your avatar?
Later this spring/summer I'll get a properly nourished antenna in the air for this beacon. But I'm hoping someone might be able to catch it as it is now.
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Good signal SIO 454 (my noise level just under S4)
2137 - cw slow speed "beerbeerbeer"
2140 - S4 signal; recording named BEER Beacon L0223I01.MP3 and available @ https://drive.google.com/drive/folders/14l0hIz_KVhAB7IRgRM8cCb-ZSu0GAAaj?usp=sharing
2142 - S5 signal; recording named BEER Beacon L0223I02.MP3 and available @ https://drive.google.com/drive/folders/14l0hIz_KVhAB7IRgRM8cCb-ZSu0GAAaj?usp=sharing
2227 - finally faded out to a bare whisper
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Congratulations, Aurora. You are the first confirmed reception of BEER. The audio files you have provided are definitive. I have also received your email. A QSL will be in the works, but please be patient. Thanks for looking out for my beacon (and hat-tip to Black Cat Systems).