signal A few years ago, I met the designer of a few of these Radio Shack switches. He happened to mention that they had paid close attention to maintaining constant impedance and achieving good port
"...Astron RS-12A power supply...The noise was very high amplitude pulses every 16.66 ms ... especially strong on top band. 73, Roger" _________________ Roger, the missing output capacitor probably h
"Is it possible to choke the QRN at the TV power cord? Would a large ferrite J core wrapped with as many turns of the power cord be effective in eliminating or attenuating this signal at its source?
Hi Tom, et al.! Some good comments about the problem. Let me add a few more: "My old cure here was a power plug with a built-in **suitable for line bypass** .01uF cap between each conductor and the s
"Does anyone have a good source of small quantities of potting compound suitable for Beverage and Pennant transformers, etc.? Maybe 4 ounces at a time (100+/- grams)" George, In our lab, we've used t
"Just wondering how you like the VA1 and if you have compared it to anything else? Read the mixed reviews on e-ham and get the impression that it is a very nice unit - when it works - which may not b
"...then I found that it barely gets down to 2 MHz with a CB whip." A short extension and a loading hat from Henry at Texas Bugcatchers would almost certainly bring it down into the band. Henry recom
"can anyone recommend a source for relatively inexpensive non-inductive resistors." Joe, I've used the Ohmite TCH35P TO220-style resistors that are available through Mouser (page 384 in the current c
end different order ... cover wide measure Tom et al., I agree. And a very interesting discussion of choke design. I've recently had to deal with the same problem in a different context, and we appl
"I have started looking around for an old low power (<5KW) AM transmitter to mod for 160. Without the modulator section, the RF-deck could become a robust rig at 1.5KW. "Would such a project be more
"...I ran the numbers, and sure enough, an S-9 +30dB signal from an FT-1000 would have composite noise sidebands that would be 20dB above the rigs minimum discernable signal...." "...I would sure hat
Michael, Thanks for your thoughtful comments. A few responses: "One possible answer is that in the artificial lab environment, we have eliminated atmospheric noise, so we are able to listen down to t
"Can anyone provide me any help in how to cure noise issues generated by neigbors invisable fence? It causes noises about every 10khz about 10 over S9. "Thanks Scott" As Gary said, it'll be tough to
"It may be only coincidence that I have a 500 kv line in that direction." "73, Pete N4ZR" Pete, Mike's comments seem to be right on the mark. As a matter of interest, here are some observations we've
here wa in was "Oh, my- that is probably begging for trouble. Not only does that technically constitute trespassing, but it would indeed look very suspicious. "73, David K3KY" You're absolutely right
"...One of them suggested that DSL might be responsible for some trash on 160. Any thoughts on this? I don't have DSL myself -- I use a cable modem, with its own (much higher frequency) set of proble
"How about a beverage made with a small coaxial cable instead of balanced ladder line.... Jacques F6BKI Hi Jacques! Did just that a few years ago, since I had a few 1000 ft. rolls of 1/8 inch diamete
I may be the last to have heard this, but I found a note in an industry news letter this morning about Rohn Industries having been acquired by Radian Corp. in December, 2003. Just a matter of interes
Sorry. I didn't mean to suggest I didn't know about Rohn's having problems...just that I wasn't aware that they'd been acquired by Radian. Brad I may be the last to have heard this, but I found a not
"I can only get a ground rod in about 1 foot. There is a standard barbed wire fence going by less than 10' away, with normal T-posts. Would hooking to it as a ground be of any use? Or, Should I just