Doug and the rest of the Top Band gang, Here is what I have observed on a 40 foot tower with half slopers, and I look at the half sloper mounted a small percentage of a wavelength from ground in a mu
Top Banders, I know everyone was interested in the CFA, and came across some pictures on the internet of the MW stations using them. Thought it might be interesting for everyone to see even though th
Wonder if anyone can comment on which antenna/SWR analyzer is the best one to buy for work on 160 meter antenna systems (with HF in general being the second reason for purchase). Wonder what analyzer
Hello Tom, I run a 68 foot half sloper (1/8 wave length on 160 meters) mounted on my 40 foot tower, and really have a blast on 160 with it. You can see my antenna in the March 1998 issue of QST. Here
Ted, I had the opposite problem that you had. I put up a 68 foot 1/8 wave half sloper for 160 meters (it is an electrical 1/4 wave with inductive loading at the feed point). You can see my actual ant
EAA01496 Sender: owner-topband@contesting.com Precedence: bulk X-List-Info: http://www.contesting.com/topband.html X-Sponsor: W4AN, KM3T, N5KO & AD1C I have been trying to find information on the CW
Dan, Following are product specifications that Beldon Cable lists for both RG58 and RG59 type cable. I am not sure what the Sat. Cable characteristics are, but thought the following information still
Hello Mike, EZNEC model of a T configuration using a 50 foot vertical section indicates each leg of the T needs to be 61 feet long (total length of the top of the T would be 61 x 2 = 122 feet), and t
I used to think the reason big guns did not hear me were due to their running directional receiving antennas, but I now suspect the majority of the problem has to do with the very narrow receive fil
I'm certainly not trying to argue with you, Dick; perhaps I'm way off base. I'm not an antenna expert. Why don't we see what the others on the Topband list have to say about the radial requirements f
work on 80, 40 30, & 20meters. Hello Jim, I'm a pretty new user of antenna modeling software, but let me take a crack at answering your question and lets see how it corresponds to other responses you
Typically I see comments that unused coil turns should be shorted, but logic tells me that for maximum coil efficiency unused coil turns should not be shorted unless the application of unused turns r
Thanks to everyone that responded to my original question, and below is a summary of the responses I received along with a test I performed last night. I did receive a few direct responses to my ques
Built a W1FB preamp (Aug 1988 QST) for use with my 4.5 square shielded loop which is located in my shack, and the MC1350 IC gets permanently altered when I transmit on 160 meters using my 53 foot bas
Thanks for all the responses (many responses received). Below is a summary of the responses I received, along with the actual fix I came up with that has solved the W1FB preamp failure problem I was
-- I too wondered what the pattern of the beverage looked like as its length was reduced so I did a simple model using EZNEC demo for a terminated 1.8 MHZ beverage (500 ohm termination) mounted 5 fee
Tom, The modification you mention for using a BF981 with the KD9SV preamp is as follows : Install a 22 ohm resistor between the 100 ohm resistor and the source of the dual gate mosfet. The 100 ohm re
A few weeks ago I installed 3 half size point fed pennants (each aimed approximately 120° apart), and have been wondering if I need to install any chokes and/or ground rod on the feedline near the fe
I received numerous responses regarding my proposed common mode noise test, and here is a summary of the responses. 1) The majority of respondents supported my proposed test. 2) There was really only
Second, a common mode choke does not in any way degrade the signal nor the performance of the antenna. but after more offline discussions with Jim about a posting by W8JI warning that a improper valu