Of course it makes a difference electrically; otherwise, why would you have to remove it? Properly done, it's more than just a few microns in depth, it's a mil or more, depending on the current used
Hi Gary, I'd look for things that are different, like the coax or balun connections. And I've never had any issues with brand-name NoAlOx in joints, either new or years later. 73, geo - n4ua ________
Patrick, Back in the day, a company called Kirk made a series of what they called "helicoidal" beams. The elements were tapered fiberglass with approx 1/4" wide, thin copper strap wrapped around in a
Steve, Google George Risk Industries GRI P-20-A. That's the one commonly used in prop-pitches and, I believe, the Orion. 73, geo - n4ua _______________________________________________ _______________
They share the same bolt circle, with the T2X having 2 more bolt locations. Four of the six T2X bolts will fit the Ham4. 73, geo - n4ua _______________________________________________ _______________
Hi Jim, The clamps for the HDR-300 are the same part numbers as the ones you are missing. They should still be available from MFJ. Last year, I sold a completely refurbished 400 with newly-machined s
And, in fact, that's what I do. One mast has a brass shaft collar that rides on a slab of Nylatron (GS grade I think), and the other mast uses a scrap TB-3 that was machined to replace the ball asse
Jorge, If this question is directed at me, no, I only use a bearing/bushing at the top of the tower. I generally have at least 10 feet of mast (~3m) inside the tower and I have always thought that th
I buried all of my 160 meter radials (approx 60) with a home-made radial plow pulled behind a compact diesel tractor - took about 2 minutes per radial. Modified subsoiler - less than $200 invested. <
New, clean, probably just fine. I have used it as the insulator at the ends of dipoles at full power with no problems. The problem with all rough-surface insulators like braided and twisted ropes is
Dan, Here's the manual from 7.61. It looks like the first number in the line, the "2", might be the type of match, and what follows are the particulars for that match. I can't get YO to run on this W
I fall into the "torque is torque regardless of what side of the mast" school. Where can one find these CommQuart articles by Dick Weber? 73, geo - n4ua ______________________________________________
Chuck it in a lathe, bore slightly oversize, press in brass or steel bushing as desired. Probably 15 minutes of work in a machine shop. 73, geo - n4ua _______________________________________________
In general, if you can't weld aluminum (TIG, etc), you should be crimping, bolting, clamping, all the while being aware of the issues with dissimilar metals. Soldering aluminum is a parlor trick and
Back in the 70's, I did a project comparing the optical cross section a lot of different growing things - mostly trees - to their radar cross section at various frequencies, UHF and up. You can proba
A properly rated clevis or pin shackle from the eye of the anchor to an equalizer plate is the usual method. 73, geo - n4ua _______________________________________________ ___________________________
Just deform a few of the threads in the middle with a punch. Do it on both sides and it should achieve what you want. 73, geo - n4ua _______________________________________________ __________________
If no one else has mentioned it, there is a very complete treatment of Synchros that was published by the guv'mint, United States Navy Bureau of Ordnance OP1303, Synchros Description and Operation. M
I just acquired a used F12 80 meter dipole with the linear-loading wires. I have read everything I can find online about this design (mostly in Tower Talk) and I have a few questions. Has anyone mode