One listens not to the two tones, in an effort to discriminate them, but rather to the slow "thrummmm thrummmmm...." that repeats at very low speeds when you get the tones close. That is, the amplitu
I think the point being missed here by one of the posters is that if the feedline is really excellent....like the 1/2 inch Heliax, or perhaps 450 ohm transmitting ladder line, or less radically, perh
Exactly Hey guys: In his book, "Reflections", Maxwell states that all power fed into the transmission line (minus line loss) is absorbed by the load, regardless of the mismatch. Secondly, with open-w
((Some content deleted)) Your point is that the better the feedline, the lower the losses, and open wire feedline is best. All true and I totally agree. The point is, if you use the very best feedlin
Yes, I've had some bad RF burns in a past life. Ouch ! Slow to heal also. That's why I use such care never to allow RF to flow on the outside of my Coax. Takes a lot of work with chokes to accomplish
Hmmm.....my breakdown would be about like this... CW - 0 (used to do it, not any more) SSB - up to 5 % (used to do it, not any more) Digital - all the rest. (love it, can't get enough !) 73 de Gary,
I have two observations about all this, or perhaps I should call them questions. First of all, I thought a tube was supposed to be pumped down to a very good vacuum and then completely sealed. Thus t
Well !! We certainly generated a very useful discussion on this topic ! Reading all the technical posts, and the links people provided, I certainly learned a lot. I now understand that the getter is
Hmmmm.....and I was just getting around to thinking about building a "test" socket setup. Are you saying that filament heat alone was enough to melt the solder ? I would have thought that it would ta
Phil, I understand your point. But, if I were to mess up again somehow, then I'd not have any more replacement grippers to switch. I suppose I could buy a spare socket. But I'm not sure if or where t
True enough ! sound pressure levels on the db A scale. They ran something like this, although my recollection of the numbers may be slightly off, by a matter of a few dBA. 80 dBA - unlimited time of
I guess we've all had horrible experiences like that, and wish we could crawl under the earth and hide. My feelings regarding the whole deal are these: Let's not be critical of anyone except yourself
Larry, Those are the classic symptoms of a parasitic oscillation. You probably already know this. But in any case, you need to look at suppression and low pass (HF) filters in the rest of the path to
grounding is As you describe these various ground systems, it is clear that there are some very long wires connecting the various ground system components together. These long wires likely have sign
poor Ok....8 feet....allow me a little slack and call it say 3 meters. A quarter wave on 12 meters. Almost a quarter wave at 15 meters. Thus probably not a very good ground at all on 10, 12 and 15 m