This subject seems to have moved far away from Force 12! Not sure of the date of the Mertel patent, but Racal Antennas developed and sold a military tunable antenna using all of the claims in around
The former AM broadcast tower where I have my remote station uses bare copper-clad steel radials. This was apparently because many of the radials are on or above the surface due to the rocky terrain,
At one QTH in England I lived about a mile from some 400kV lines. Operating on 160m or 80m was uttterly impossible in damp weather - and that is a lot of the time in England! The lines would be quite
"That used to be a big problem for cable tv companies that used hardline with copper center conductors" I had exactly that problem a while ago with the feed to my Beverages which is several thousand
I have 6 commercial (AM Broadcast) tower sections that I would like to use for a 60' tower, and would be grateful for advice: The sections are triangular with tubular verticals, 1.5" OD, ~1.125" ID,
I am reminded of the old saying: "If you pay the most, you may get the best. If you pay the least, you will certainly get the worst." Having said that, there is some perfectly good cable coming out o
"ISO 9000 traceability means very little unless they've changed from when I had to make lab systems meet compliance. Essentially it means document what you do and do what you document. It has little
This may not be the correct forum - please forgive me if it is not. I have a 900 MHz link between my home and my remote station, and at present the UHF antenna is at the 240' level on the tower which
I have made a receiving four square array using 25' masts with top loading much as described by W8JI. The verticals and ground systems are pretty much identical, the only significant difference being
I think I can answer my own question now, and the answer is faulty measurement technique... I am only using an MFJ259 to measure both impedance and resonant frequency, but my instrument cannot differ
I had a similar requirement for a motor operated vacuum variable in the auto-tuner at my remote station, although my motor only produces just enough torque to turn the capacitor. After lots of though
Jim I'm not sure that this is exactly analagous, but I have a tri-band vertical mounted right at the edge of a reasonably large lake (~0.5km x 20km). I found that that dramatically improved its perfo
I really don't know the reason - my experience is purely anecdotal. I do not however think it is much to do with the conductivity or otherwise of the water. The water is pretty pure (drinkable withou
Please forgive my posting this question here - if anybody can suggest a more appropriate forum I would be grateful. For several years I have had a 900MHz link between my home and remote stations. The
"If he's been bothering you, I'd guess that your higher power and more gain may have also been bothering him. Perhaps he's moved to a different frequency? I'd continue bombarding the ether with as m
Look-out/fire-watching towers made of wood are (or were) quite common in provincial/state parks and similar. Some of the ones I have seen have been well over 40' high. So it is certainly possible, al
I have an old AV3 10-15-20m vertical. I used to have it on top of a 20' pole with 4 radials for each band. Compared to my A4S it was so bad as to be useless - although the match was good on every ban
I am proposing to use a Polyphaser type RGT suppressor in the antenna feed for my 900MHz link. The specs appear to show that the suppressor is quite suitable for the application - I need DC passthrou
I think the definition of 'single point' can be a little tighter than it may appear: My remote station is at a former AM broadcast tower - so that is very well grounded indeed. I also have an APRS di
There was a short discussion a while ago on whether a vertical was better ground mounted fed against ground radials or up in the air fed against resonant radials. The general consensus was that 'up i