I'm moving to a new QTH and have been planning to put up a US Tower MA-770 with motor crankup and base, but ideally would like something a bit heavier duty. Zoning restrictions limit me to a 8" diame
I've heard that for years, but I read recently (I think on the Polyphaser website, but I could be wrong) that that is an urban myth and that grounding a rebar cage is actually very desirable. Does a
Hi Gang, I've read some of the websites and notes you've all suggested with interest. (This is a subject of great interest to me, since I've just finished installing my tower!) Here's what my ground
Hi Gang, I need some advice for a common problem. I have a crankup tower that supports a 160m inverted Vee. The ends of the antenna are tied to 6ft tall 4x4 posts. I'd like some way to take up slack
Dave, the different in loss between LMR400 and LMR600 for your application is not very much. Using the coax loss calculator at http://www.ocarc.ca/coax.htm I find that, at 440 MHZ, with a 60 ft run u
Hi Dave, I don't see why his test is flawed. Seems pretty creative to me. Your suggestion probably woudn't yield consistent results because of QSB. Jim W8ZR ** Jim Garland Santa Fe, NM www.w8zr.net *
I can recommend the C.A.T.S. RD-1800 ( http://www.rotordoc.com/sales.html ) It's a drop-in replacement for a T2X, but has twice the power (1800 in-lbs torque, 12,000 in-lbs braking). It is a much mor
Just mesh the plates and look inside (I"m assuming they're the glass type, not the ceramic type). If the concentric plates are centered with respect to each other and if the mechanism turns smoothly
Dave, My QTH has the service entrance to the house located immediately adjacent to the exterior coax entrance panel outside my station wall. All grounds, including the house 240V service ground, the
Hi Gang, A few months ago I put up a Tashjian TM-370D 70' Sky-Needle (same design formerly made by Triex). and would like to find some owners of Sky-Needles to compare notes with. The TM-370D is a he
Bill, that's quite an interesting mystery! Evidently, you're overloading the power supply and it's shutting down, so I agree with Jerry's assessment. However, from what I understand, the stepper moto
Is the schematic for the steppIR controller circuit available anywhere? I'd like to take a look at the driver circuitry. From the discussion, it sounds like SteppIR is using a standard H-bridge bipol
but on 10 or 12 meters, where the feed is likely to be mulitple lambda in length, I wonder if using the antenna as a tuner gets the user into something like the "my feedline tunes my antenna!" type o
I think Jerry is exactly right in his suggestions. Evidently, some sort of current transient is shutting down the power supply. A 12V negative spike on a +33VDC power supply at tuning startup is very
I'd been planning on lubricating the 3/8" pull up/down cable on my crankup tower with Prelube 6, but I've heard that Prelube 19 is a better and more modern substitute. Unlike Prelube 6, Prelube 19 le
It's a very cool design, especially the trick of using inductors to shunt the insulators at the base of the supporting towers in order to null ground radiation. It's interesting how high-angle skywav
I DO remember all those Gotham ads. But, curiously, I never actually talked to anybody who actually was using one. Even in the 1950s, Gotham prices seemed impossibly low. I always wondered if they wo
Gng, Today, I tried to wire up the connectors for my CATS RD-1800 ver.2 rotor and DPU-1800-d control unit, but can't find my manual. I'd really appreciate it if somebody could email me the pinout for
SS Ty-wraps are pricey, about $2/each, last time I checked them. Also, the kind I saw can't be removed without cutting them, Because they're very flat, cutting them isn't easy if they're tightly wrap
Gary, the RFI is almost surely coming in on the CAT5 cable. I doubt the WiFI transceiver is picking it up through its antenna. (You didn't say so, but I'm guessing the transceiver uses an integrated