FYI....cumulative discussion...bottom posted...please keep discussion intact for future antenna builders who want to know about this subject. All antenna guru's are invited to post. -- -- On Sat, 16
Yeah, expensive knockout tool if you can even find one small enough. I think the Carlon boxes may be too thick for a nibble tool. For a one-off just drill a smaller hole and use a file to shape it wa
I was curious about the junk right-angle connector, so I sawed one open. Yep, just as Jim described, it's a tiny spring that makes the connection. Can take a photo if anyone wants a peek. 73, Charlie
Hi Gents, I need a fellow ham to pickup a small load of "radial wire" on spools this coming March 8 to March 13. What is there will usually fit in most trunks of a small car. 'Course a van would be e
I wouldn't use Delrin for that....had Delrin on a 4el quad some years ago and it wasn't UV proof...also, seemed to become brittle over time. Delrin insulators would break under stress. Have you check
It's a 1:1 balun. Chances are there are corroded connections inside the box due to the steel rivets used in assembly. I opened the plastic case and repaired mine....taped box back together...been tha
Hello everyone, I recently aquired a "commercial" dummy load that I'm sure will handle more than 2kw. There are 12, 600-Ohm resistors in parallel that measure 50-Ohms with a Ohmmeter. The resistors l
Thanks to Jim and Chuck! Definately non-inductive for this application, but the power rating is, I don't know. I know it was used at a 5KW AM radio station for some testing. I should have mentioned t
OK, thanks Jim, Interesting why Bendix would call this thing (in part) a "modulator"...nothing in there to modulate a RF signal that I know about....just a high power 50-ohm dummy load. 73, Charlie,
I think you're right there Jim. I see on the schematic it is named: "DUMMY, LOAD, MODULATOR" Charlie, N0TT https://theelectrostore.com/content/datasheets/kanthal_globar_resistors.p __________________
Assuming "light weight" rotors....you'll still need to guy... Chain link fence "top rail"? 10' lengths at Home Depot. Cross-bolt together. An "outer guy" near the top can run to a ~3ft "stiff arm" ne
Grant, I made a "multi-freq" oscillator using a couple of 555 timers, one of which was allowed to run almost "wide open". That was the signal generator/oscillator. The other 555 turned the oscillator
The "secret" to using wood outdoors is to soak it down good with Thompson's Water Seal (following label directions) before painting. Last's a VERY long time! Tempered hardboard is good for making the
It matters.... The Loos measures the amount of deflection on whatever cable is being tested. If the cable isn't the size that the Loos isn't calibrated for then the reading isn't going to be correct
Yes, and the tail is not just for conveniece sake, it's to keep the Philly out of reach of grass fires and maybe even someone with a pocket knife. Charlie, N0TT ______________________________________
Kurt, Not really. The guage should be calibrated for whatever cable one intends to measure. It's that simple. 73, Charlie, N0TT _______________________________________________ _______________________
It's all about the diameter of the wire under test and the amount of deflection when the mechanics of the Loos presses on that wire to deflect it between two points on the instrument. The amount of d
Hi Guys, I have a multi-KW forced air-cooled dummy load. It came from the Boeing plant in Wichita KS. The official designation is "Dummy Load Modulator". Dummy load I understand, but WHAT is the "mod
Thanks for all the replies! My curiosity about the "modulator" is now neutralized....hi hi 73, Charlie, N0TT _______________________________________________ __________________________________________
IIRC the beam antenna handbook says, the overlap should be about 3 times the diameter of the larger tubing. That allows for a ~2" slit so you can tighten the joint with a clamp. So, 6 inches for your