Pete, In general, today's transceivers will reduce the output power function of the detected level of the SWR. Thus, the more SWR you have, the less drive from the transceiver is available. As all ot
Actually transmitters are energy conversion devices. Maximum available power capability that does not reach the antenna does not necessarily turn to heat. As a matter of fact a mismatch just as ofte
Woops, the results are correct but I described the impedance wrong. In this case the surge impedance of the network would be the geometric mean of the input and output impedance. Phase shift would b
Tom, et al: With regard to T-networks, this is why its important to record your tuner settings instead of searching for minimum VSWR each time. At the local club, one of my friends was using an MFJ-9
Tom. You are promulgating wrong ideas and concepts which will repeated by the neophyte. Please go back to the books and redo your homework about energy conversion/conservation in RF systems. Besides,
Alex wrote, in part: Nonsense! Tom is absolutely correct! Go to the University of Chicago web site where a tuner simulator is set up. Read the instructions, use your antenna system analyzer to determ
I hope they do grasp the correct concept, then all the folklore about SWR and what makes transmitters and tuners hot will cool off. The only thing SWR does for certain, at least in the systems we ar
BTW, the XMatch tuner I mentioned by N4XM, is called a "Classic Lowbander" tuner. The design contemplates use primarily on 160 and 80. It works 40 on up, but perhaps not with the highest efficiency n
Guys, all I asked was whether I could do any harm to my transceiver by operating it into a high-SWR load, or at least one high enough to cause the output power to be folded back by the protective cir
Pete ..... I think the simple answer is that if your transceiver is astute enough to "roll-back" the power when confronted with an offending load, you are safe. Guys, all I asked was whether I could
the OK, I will ask the question that wasn't asked but got responses because the responses were very interesting and applicable to my situation. Just a few hours ago, UPS delivered a TENTEC 238a 2000
I wasn't answering your question, because no one can answer it. The only answer is if it didn't blow up, it is probably OK. I wouldn't run a rig without an adjustable matching system into a high SWR
I can answer it :-) You most likely will be stressing the circuitry in the transmitter. Depending on the SWR cut back protection circuit and its time constant, there could be glitches of overload on
If the SWR causes excessive voltage in the PA, it will BLOW the output transistors. If the SWR causses current in the PA, it will cause excessive heat. Hopefully, the SWR protection circuitry is des
Yep, same here Tom. I can't match my dipole any better than 3:1 on 10 meters with my tuner, so I use the Drake L-7 as a buffer. The tuned input on my amp lets the solid state finals in my exciter see
I think that sums it up pretty well, except to say voltage is generally limited by the operating Q of any resonant circuits (they can ring) AND the design of the PA. With class AB or A PA's in push