Re: Topband: Waller Flag Question

Maybe his secret is a preamp cooled with liquid helium! ;-) Seriously, there are preamps operating at 70 degrees F (for example) that have less than a 1 dB NF at VHF. They are usually mounted at the feedpoint of a high gain array, because of feedline loss. Today, I have the type of terrible cold

Re: Topband: Waller Flag Question

On Sun,9/6/2015 4:31 PM, Tom W8JI wrote: Thanks for the insights. I have no doubt the theory is correct. My sense, though, is that in the denser suburbs, we live in a "fog" of local radio noise, generated by the scores of digital and other devices that surround us. The sad thing is that

Re: Topband: Waller Flag Question

Bruce wrote on Sept 6. Snip < Check it out http://www.qsl.net/k4fk/presentations/WF-receiver-antennas-SFDXAs.pdf > Bruce, ref to the link above there is a gap in the "History of the Flag Antenna" The earliest fef. to the Terminate loop I have found is in Keen’s Wireless Direction Finding

Re: Topband: Waller Flag Question

Thanks for the insights. I have no doubt the theory is correct. My sense, though, is that in the denser suburbs, we live in a "fog" of local radio noise, generated by the scores of digital and other devices that surround us. A similar observation was made 20 years ago by Brian Beezley,

Topband: Waller Loop Antenna

Many thanks to everyone who helped in my efforts to get my Waller Loop working correctly. Carlos very kindly sent me an email showing me the effect his tower has on altering the polar plot, his recommendation was detune the tower - this cured his  problem - there is a free Polar plotting

Topband: Waller Flag Question

It can be done. JC, N4IS has been doing it and has the DX contacts that most can not hear.. The proof as they say "is in the pudding"  He uses balanced twisted pair feed lines with  pre-amps, and other noise reduction techniques..   Check it out

Topband: Waller Flag Question

The on-line materials about Waller Flags says that a modest size WF would need about 40 dB of gain to boost the signal to a usable level. One of the postings says that cascading two preamps of 20 dB each seems to add extra noise, and they talk about developmental work being done on a single

Topband: CE1TBN

I am happy I made 20 qso. 4 new one. Thank you CE1TBN Happy Ham El jueves, 3 de septiembre de 2015, Marco Quijada escribió: > Good. I ll try to catch you > > CE1TBN > > El jueves, 3 de septiembre de 2015, sulaiman Aljedaie 7Z1SJ < > s7z...@gmail.com

Re: Topband: CE1TBN

Congratulations Marco ...good job !!! 73Douglas, CO8DM "No creo que haya alguna emoción más intensa para un inventor que ver alguna de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, de dormir, de todo." - Nikola Tesla - Original Message - From:

Re: Topband: Waller Flag Question

Art Delibert wrote on Set. 6 snip would need about 40 dB of gain to boost the signal to a usable level. One of the postings says that cascading two preamps of 20 dB each seems to add extra noise, and they talk about developmental work being done on a single preamp of 40 dB. Is there now

Re: Topband: Waller Flag Question

The on-line materials about Waller Flags says that a modest size WF would need about 40 dB of gain to boost the signal to a usable level. One of the postings says that cascading two preamps of 20 dB each seems to add extra noise, and they talk about developmental work being done on a single