ORIGINAL MESSAGE: REPLY: The amount of power dissipated in the suppressor resistor on ten meters can be controlled by using more or less inductance in the coil. Less inductance = less dissipation, bu
I dont understand how moving the resonant frequency of the coil up and using the same resistor raises the Q? More inductance than necessary will result in more possibility of absorbing the wanted RF.
ORIGINAL MESSAGE: REPLY: If you are talking about the suppressor coil, it is not resonant and has little effect on the VHF parasitic frequency because it is bypassed by a low value resistor. Its purp
ORIGINAL MESSAGE: REPLY: If that were true, why do we see so many burned up suppressor resistors in both homebrew and commercial amps? The balancing (of L and R values) is trickier than some people t
Bill: I have a feeling that people are just "putting in stuff" with neither a clue as to why they are doing it nor what they are trying to accomplish. Sad to say, this may very well apply to "commerc
Your understanding of parasitic suppressor design is 180 degrees opposed to reality. I suggest that you study up on the subject instead of inflicting new amp builders and others who apparently also d
And what commercial amps are burning up these suppressors? I can understand a few home brewers who either dont understand the subject or believe the misinformation thrown around as in your prior post
Its been a long time since Ive seen or heard of a poorly designed commercial suppressor burn up. Real amplifier engineers have understood the subject for decades. The problem seems to continuously co
Radio Handbook, 20th edition (17.22), " In the process of adjusting the resistor coil combination, it may be found that the resistor runs too hot. The heat is usually caused by the dissipation of the
"If one did not care about bypassing the HF around the resistor, one could have only the resistor without a coil at all and the parasitic suppression would be equally effective. Power loss would be h
ORIGINAL MESSAGE: REPLY: Please, give us your version. I can hardly wait to hear how parasitic suppressors actually do their job. I have stated my opinion, let's hear yours. 73, Bill W6WRT __________
ORIGINAL MESSAGE: REPLY: Exactly right, Jim. That's what happens to all of us when we are new at this but hopefully, with some experience, we are motivated to look deeper into what's actually going o
ORIGINAL MESSAGE: REPLY: Hit the archives, Carl. It's been a common complaint on this and other reflectors for years. 73, Bill W6WRT _______________________________________________ Amps mailing list
My opinion has nothing to do with it; Im relating to facts. It was published in QST so any ARRL member should be able to access it. It was written by Bill Orr and a follow up by one of the ARRL staff
I guess that means that you are unable or incapable of backing up your statement. Here it is again for you. "If that were true, why do we see so many burned up suppressor resistors in both homebrew a
I quoted part of the same thing from the "Radio Handbook" 13 lines down from this post. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://li
ORIGINAL MESSAGE: REPLY: Of my personally owned commercial amps, the Command HF-2500 had burned parasitic suppressor resistors. Just in the last three days, the following posts have expressed the sam
ORIGINAL MESSAGE: REPLY: Correct. Just to be clear: It is not the choke that does the suppressing, it is the resistor. The purpose of the choke is to provide a path for the lower frequency HF energy
Hmmm...That is not what I get out of the statement. The job of the coil/inductor is to provide enough reactance at the frequency of the parasitic to "quench" it, yet not provide enough reactance at t
I see then that you blame vintage 30-50 year old amps with cooked suppressors as proof of poor design. Or in the case of the HF-2500 about 15 years old and most likely tuned by someone not familiar w