Community Digest |
Top new questions this week: |
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Question about low voltage from mains for tube amplifier 811hEdit: So I guess what i really want to know is more technical question regarding 572b tubes. What plate voltage is minimum to safely drive 572b tubes? what is lowest filament voltage to optimally ...
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Quartz Oscillation Output Signal Amplifying for more Power?Quartz oscillation is well known for its high Q-Factor and stable frequency. I have read many articles which say that amplifying such quartz oscillations should not be easy. I am not a licensed radio ...
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In WSJT-X my waterfall display is not showing any signalsI had to change hard drives in my PC and now my waterfall display is not working. I DO have control of my IC-7300 via USB. I have connected the audio just like before. Am I missing a special driver or ...
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Greatest hits from previous weeks: |
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FCC tracking of unlicensed FRS/GMRS transmissionsIf a transceiver such as the BaoFeng UV-5R is used to transmit over FRS/GMRS frequencies (unlicensed), it is illegal in the United States due to FCC regulations that state that the power must be <0....
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PL-259/SO-239 vs N Type vs BNC which is best connector to use when?I understand that the: PL-259/SO-239 connector (so-called "UHF connector") isn't great for UHF frequencies, but is very common N type connector is water-proof; and the BNC connector is quick to ...
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BF-F8HP: "Radio did not respond" when trying to use CHIRPI'm trying to program my Baofeng bf-f8hp with the chirp software, but as I have to do, "Download From Radio", after I choose the appropriate maker, product and model, all I get is an error ...
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Using my Baofeng UV-5R to talk to walkie talkiesI have a few walkie talkies at home and sometimes I connect my UV-5R to them to talk to them and act as another walkie talkie. At one time, I built a little simplex repeater out of it. Should I not be ...
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Does a 1/2 wavelength end-fed antenna need a good RF ground?I was searching for DIY end-fed antenna. Some of the articles I found say that for a 1/2 wavelength end-fed I need a "small to no counterpoise" (with a lambda*0.05 m counterpoise), but some other ...
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What is dB(μV/m), and what are its applications?Many radio coverage tools yield results in dB(μV/m). For example, CRC-COVWEB or nearly any tool based on the Longly-Rice model. The unit occurs in regulations sometimes as well. For example, maximum ...
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FCC sends "Notice of Dismissal" with quite threatening language just for denial of a vanity callsign?I had applied for a vanity callsign which wasn't available. That was in March. The FCC license system shows my old callsign is still in effect. Today, after a longer absence from my mail, I open a &...
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