Hi Gary, Yes, based on how strong the RFI is on 20 meters, your un-tuned shielded loop should definitely hear the noise on 20 meters (as an example) based on my tests even without using an external p
Hi Mike, Sorry to everyone. Guess thats what happens when you do e-mail while still in bed hiding under the sheets so you dont wake your wife with the bright screen on your phone. 73, Don (wd8dsb) __
While playing around with my portable flag that I designed for MF/HF radio direction finding, I noticed something that confused me for about a year, and I finally figured out what's going on which le
Hi James, Yes, multipath is certainly a variable, and I'm actually trying to include something that's not outwardly obvious regarding the directional response of a receive antenna related to polariza
Hi James, I left a word out, and I have now added the word into my below text (I added the word horizontal). Yes, multipath is certainly a variable, and I'm actually trying to include something that'
Hi John, Hard for me to argue your purely vertical antenna system skewed observations. Thanks as always. Don (wd8dsb) _________________ Searchable Archives: http://www.contesting.com/_topband - Topba
Karel (OK1CF) was calling CQ for hours on end early this morning with very few callers, and his signal was very steady into the Indianapolis area so I decided to record and upload a brief recording o
Hi Chuck, Based on the application you mentioned, I suspect youre looking for commercially available bias tees. MFJ sells Bias Tees. Don (wd8dsb) _________________ Searchable Archives: http://www.con
Andy (DL8LAS) had a very nice signal into the Midwest US last night. I made a brief recording of him calling CQ and uploaded it onto youtube. Peaks were very strong but there was also considerable QS
Hi Mike and gang, It has been a long time since I looked at the SAL in which I modeled it with the help of the designer of the SAL (KB7GF). The SAL is actually different than the K9AY and other EWE t
Hi Jose, To keep things simple, I say the K9AY is not like a pennant or flag since it has been demonstrated by many people to be more ground dependent (sometimes needing added ground radials). Under
Hi Jose, I would like to make one more comment to make us all scratch our heads. You said "The remain wires works like two vertical in phase, as the same in any flag". But the Flag when modeled has a
Hi Andy, I agree with David (K1WHS) that your RF Spectrum waterfall display does not look like powerline noise as it shows very repeatable bright and dark bands and the bright bands are equally space
Hi Bill, You should still be able to compare yourself to V31MA using the RBN data. Just find out how much power V31MA was running and compare it with your power level in units of dB. Then you can use
Hi Bill, I misunderstood, it looks like V31MA was running low power, so you would have to subtract off the difference in dB from your RBN data to see how it compares with V31MA. Don (wd8dsb) ________
Hi Frank, Thanks for mentioning my portable flag, and that's the way to go to get close to the area of the suspect pole but I didn't want to toot my own horn. It really is an easy antenna to build an
Rick, When I mentioned using an AM radio with a 3 or 4 element yagi when within 0.25 miles of the source I should have said thats up on VHF (like 136 or 146 MHz, etc.) if its really power line noise
Hi Jim, Below is a link to a simple website I have for my portable flag antenna and you will find a link in the first paragraph of my website to the original QST article (with the permission of the A
Hi Rick and Frank, This may have already been discussed offline but if WWRU 1660KHz is indeed one of 2 stations mixing then the math suggests 1380 KHz is a prime candidate regarding the second transm
Hi Frank and gang, I might be able to help provide some additional insight/direction. This is not necessarily a case of having to show harmful interference, as the AM Broadcasters are held to some ve