Post Aa2udxSBwl7lLEfqWu by freepeoplesfreepress@qoto.org
(DIR) More posts by freepeoplesfreepress@qoto.org
(DIR) Post #Aa2qA939rstsnoUeDg by freemo@qoto.org
2023-09-23T02:32:16Z
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The antenna is up, tuned, and working!(Video attached, analysis and pictures in first reply)#Ham #HamRadio #AmateurRadio #Radio #RF #ee
(DIR) Post #Aa2qJGG8QvzflfuUO8 by freemo@qoto.org
2023-09-23T02:33:55Z
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Analysis and another picture attached below.
(DIR) Post #Aa2udxSBwl7lLEfqWu by freepeoplesfreepress@qoto.org
2023-09-23T03:22:30Z
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@freemo Dear Dr. Freemo: The antenna looks pretty good on the Standing Wave Ratio (SWR), I have encountered the subtle changes in SWR readings when an antenna flexes in high winds. Have you ever encountered subtle changes in SWR readings during high winds? Sincerely, Monica Andrews, Amateur Radio EnthusiastSincerely, Monica Andrews, Editor-in-chief, #FreePeoplesFreePress News
(DIR) Post #Aa2v2no4x1fmf4l4S0 by freemo@qoto.org
2023-09-23T03:26:58Z
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@freepeoplesfreepress I have not seen changes in SWR during high winds when measuring it under these conditions or from the radio. I can pick it up, however, when i use my higher end equipment. Its very small though.
(DIR) Post #Aa48SmGkmc3hz5qYk4 by kilroy_was_here@dobbs.town
2023-09-23T17:32:03Z
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@freemo Just a basic vertical with traps?
(DIR) Post #Aa48gJLN7lGwKNSavI by freemo@qoto.org
2023-09-23T17:34:29Z
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@kilroy_was_here Yup.. plus radials which you can see in my first reply.
(DIR) Post #Aa48kD2yTeLdxOiJqS by kilroy_was_here@dobbs.town
2023-09-23T17:35:13Z
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@freemo Saw those. That was the pic that let me see they were traps and not junctions.
(DIR) Post #Aa48ni1jkbIOuOntXk by freemo@qoto.org
2023-09-23T17:35:49Z
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@kilroy_was_here coil based traps yea :) All on the roof on my philly home, so very small footprint.
(DIR) Post #Aa48ykdIP1lCAxdY36 by kilroy_was_here@dobbs.town
2023-09-23T17:37:45Z
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@freemo Nice seeing somebody else from PA showing ham radio stuff on the net, most of the time it seems like it's just folks out west who are doing that. lol
(DIR) Post #Aa493VbNiMVr0S0gWO by freemo@qoto.org
2023-09-23T17:38:40Z
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@kilroy_was_here haha yea they have more space there.But check out a APRS map sometime, you might be surprised how active the east coast is :)
(DIR) Post #Aa6bLafomcqSyrPp4q by rombat@sfba.social
2023-09-24T22:05:07Z
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@freemo @kilroy_was_here Any RFI effects in the house? I have a similar rooftop in SF with an EFHW and working on some suspected common mode issues.
(DIR) Post #Aa6bWUrCkTcY7vwSg4 by freemo@qoto.org
2023-09-24T22:07:05Z
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@rombat None that I specifically noticed. I get s2.5 to s4 noise floor though and im sure at least some of that is from the house.Keep in mind the roof top radials act as a sort of shielding from RFI for the active vertical, so they are particularly good for rooftops.The first time i installed this a decade ago though when id transmit my neighboors backyard light would turn on... which kinda sucked considering iw as running an APRS beacon 10 minutes apart :)@kilroy_was_here
(DIR) Post #Aa6bhFo52uRQdObsuW by rombat@sfba.social
2023-09-24T22:09:03Z
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@freemo @kilroy_was_here I was thinking the radials might have that effect. Might give a vertical a try one of these days up there. I’ve found 40m CW or FT8 to be particularly triggering. Last night it rang my doorbell system. 😬
(DIR) Post #Aa6c2QQkk4wXfGnILA by freemo@qoto.org
2023-09-24T22:12:51Z
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@rombat Its not usually the mode but the frequency + power.. i am willing to bet if you switched to FM on the same freq and transmitted youd get your doorbell going off too.@kilroy_was_here
(DIR) Post #Aa6c7MZsUi3vABPu2y by rombat@sfba.social
2023-09-24T22:13:45Z
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@freemo @kilroy_was_here Higher duty modes seem to make things pop on a lot more. But it could be just where that is in the band, I agree.
(DIR) Post #Aa6cESRx3nA7P15mmO by freemo@qoto.org
2023-09-24T22:15:02Z
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@rombat Yea its just cause they put more power into the band.. SSB if you arent talking but are pushig the PTT nothing will come out the antenna... it only puts as much power in aws the volume it hears... If you make a very loud whistle into SSB it would be almost the same as CW (except not quite as clean a tone obviously)@kilroy_was_here
(DIR) Post #Aa6cnz6rciHIpZAYGO by kilroy_was_here@dobbs.town
2023-09-24T22:21:24Z
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@freemo @rombat This is one of the reasons my elmer always told me to tune up in CW or AM mode (FM wasn't common on radios back in his day). The more power going through the antenna path the better you can dip your SWR meter.
(DIR) Post #Aa6csWMrud2t8Zoniq by freemo@qoto.org
2023-09-24T22:22:16Z
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@kilroy_was_here yea tuning up in CW is still the norm unless you have an auto tune... in a pinch you can whistle into the mic too but its not as clean.@rombat
(DIR) Post #Aa6d0nrmjjajj1EEdM by kilroy_was_here@dobbs.town
2023-09-24T22:23:48Z
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@freemo @rombat Yea if he ever wanted to check his tune or retune after moving slightly up or down he'd whistle in the mike.