I don't know what Davis RF will recommend to resolder fine stranded wire that has become oxidized, but this old industrial electrician has had to do that in the distant past... My method is 1. comb /
Hmmm, looks to me considerably less than -25dB difference... Ionosphere reflection is shown as ~ -64dB <avg> and the moon is looking like ~ -78dB... Wonder how much loss they had in matching those sh
I have a bunch of Jay's relays in use up to a thousand feet from the shack and have no problems... Of course, I make sure there is adequate voltage and current at the relay for reliable switching...
Tim, I am going to play the devils advocate here... How many of those TIC Rings do you maintain yourself? I assume it is your volunteers who mainly climb the towers and do repairs when things fail (
I guess my age is showing... What you guys want is called a current breaker... It is a short rectangular loop of wire taped parallel to the boom... It is a method of inserting a trap where you canno
Well, if you ask ten hams a question like you did you will get 11 opinions - because one will change after hearing the others... So, my opinions are: Yes, running a second beverage parallel and close
Steve, Moxon in his book on HF Antennas For All Locations brings up this subject and he later revisited it in his ARRL article on assymetric fed dipoles... I have done some tinkering with assymetric
Pete - right on! I am dismayed by the lack of the old ham spirit that I see in todays operators... Pete pointed it out quite clearly... 12 relays @ $3 a pop - $36 Roll of quarter inch dia. soft cop
HI Jim, thanks for the comments... Yes, the relays will handle the voltage and current at 1.5kw... The ones I use are ~ $2.50... I buy typically 2 dozen at a time for the price break.. You have to r
Discussions like this wax and wane with opinions... However there is actual data to work from.. The easiest to understand is the work of Rudy Severn, N6LF (do a web search) His field measurements (no
ICE is open during normal business hours and has to answer the phone to take orders.. I ordered a pair of 419 filters from them over the phone two weeks ago, they answered on the second ring, and the
Well, of course... AFTER I post my message I skim through the list and I see a number of flolks having problems with ICE... It is clear from the groups experience that ICE has problems and I was a lu
The word picture (and diagrams) of the 'missing half 'of a dipole antenna going down into the ground is a device to help visualization of how the induced ground currents act to complete the return cu
Steve, I agree that is what a Mininec model likely shows... A model is not the real world... A good read of Cebik in this subject will give additional information... ... And while my example may be a
Ah jeezzzz.... Makes my stomach hurt just to look at it... denny / k8do _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTal
Many hams (if not most) would like an absolute law allowing them to put up towers/antennas... This is not going to happen in your lifetime, or mine... Even as Palmdale heats up there are innumerabl
I have two towers held up with Phillystran and Big Grips, 120' and 150'... Been about 13-14 years now - I would need to go look at the date scribbled in the concrete at the base of the towers to be s
Gary, the pattern of the basic dipole will be the same (slight differences), but the gain and the impedance at the feed point will be down and the resonant frequency will rise slightly... How much t
A skyloop can be a good compromise, all band, antenna solution for lots of folks... I had a coax fed, horizontal loop cut for 40 meters at 18 feet above ground, primarily for a listening antenna and
Bob, have you modeled it? I bet you will be surprised at what you find... Don't get carried away and try to replicate your beam and all that... Just model a 55 vertical tower at 10" dia with a 17.5 f