You probably have a preamp on your rx loop. The first thing to do is kill the dc to it on transmit to shut it down. I have an Airspy HF+Discovery SDR which has a fragile front end. To keep tx RF out
My rx antennas are around 40 to 50 feet separated. I get good peaks and nulls on 160 and the top of the AM broadcast band. 80 m. doesn't work as well. But 160 is where you really want it to work. Tha
My hunch is that your problem is the wire you are using. My inv. L is strung with hard drawn 7 strand bare AWG 14 copper. Multi-strand or solid soft drawn will probably break on you eventually. 73 Ro
I have a NCC-1 with a pair of rotatable pixel loops. I have one filter in the NCC-1, a high pass broadcast band filter. It really hits the stations around 1000 and below. Doesn't have much attenuatio
Bad idea, except maybe for field day or some other temporary setup due to rust. Also, long thin runs of steel may not return RF well. For permanence it's a lot better to invest in 3000 feet copper t
spent a while in the shack listening to the noise, and monitoring it on their equipment connected to my Top Band dipole. After about 45 minutes they both went out in the street, and an hour later th
The problem with adding a top wire to your 43 foot vertical is that it is probably not made to support a wire pulling on it at the top, unless it's cross section is uniform and it is guyed at the mid
For medium wave, every ham who transmits with a base excited vertical radiator should get a copy of _Radio-Electronic Transmission Fundamentals_ by B. Whitfield Griffith, Jr. 2nd ed., Noble Pub. Co.,
I can't comment on the folded counterpoise because I am not familiar with it. The "broadcast model" which I take to mean 120 radials is used because in the case of a 90 degree tower on medium wave, t
I know many will disagree but I wish the ham industry had never gone to RG6 and F plugs and jacks for filters, preamps and various rx antennas etc. I know that UHF/BNC/N take up more space and cost m
Good luck with that voltage breakdown rating for foam RG6 running high power through it and other than a flat line. As to the milliwatt loss on transmit, okay FB but on rx with microvolts, I'm alread
Good question. I don't think you mentioned any cost limit. Given that I would put up a substantial self supporting commercial tower ~ 130' tall. Solid legs, 5 or 6' face tapering to 1 or 2 feet. Pyro
What makes you think it is just being discovered? Rob K5UJ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
If that were all I could add, I'd switch them to 40 35' radials. The R component of my inverted L on around 1840 is 11 ohms. X is around 20. That's with 101 radials. I look for a R of at least 15 oh
I am always amazed at the hams who will buy a home within sight of a broadcast tower. Rule no. 1 when looking for a new QTH is to find where all the AM and FM plants are and avoid them; especially QR
There were a few electronic key designs that surfaced in the '50s, maybe even late '40s, usually appearing in QST. But then Jim Ricks W9TO designed his TO Keyer which Halicrafters started manufacturi
Does this mean we are better off using something like RG8X with copper shield and center conductor for lines to low band rx antennas? 73 Rob K5UJ _________________ Searchable Archives: http://www.co
On those ICE preamps, check the small dipped inductors, because they can blow open if the preamp is exposed to a high enough RF field. If your preamp is on a rx antenna and you are transmitting with