This will be a 2M sensor, about 10m from the PA and just before a preamp, connected to a 17 ele Tonna. The preamp can handle 150W and the contests I'm interested in have a 'restricted' section for 100W max, so I want to ensure I'm not pushing more 100W into the pre-amp, which with losses I guess could be 110-120 PEP at the amp.
Not two worried about SWR at the amp and I have a simple MJF the I can use to measure that in the shack. Plus I'm considering options to 'A-B' switch sensors if I have more than 2. I'm also feeding an SGC to a long wire, which is remote by approx. 30m and considering putting a remote HF sensor down there. This is fed direct from the K3/100 in Bypass mode, so SWR readable on the rig. 73 de David, M0XDF (K3 #174, P3 #108) -- Any hound a porcupine nudges, Can't be blamed for harboring grudges. I know one hound that laughed all winter, At a porcupine that sat on a splinter. - Ogden Nash (1902-1971) On 28 Jan 2012, at 00:50, Mike WA8BXN wrote: > > > Its not clear to me why one would need to put the sense element at the > antenna. About the only benefit to it that I can see is you can make sure > your coax to that point has not become extremely lossy. Just about anything > else can be measured with the sensor in the shack. One would be more > interested in knowing the SWR looking into the feedline at the transmitter > than at the antenna end. > > If an automatic antenna tuner is near the antenna feed point, if its working > then the SWR should be low in the coax from the tuner to the rig. Trying to > read the SWR between a tuner and antenna is not all that useful and many swr > sensors may not be accurate when not used in 50 ohm feedlines. I didn't > quite say that right. Between a tuner and antenna we would expect a high swr > and the feedline not matching the Z of the antenna. If the antenna is > resonant, then a tuner would not be needed. > > So I am missing something, perhaps someone could fill me in! > > 73/72 - Mike WA8BXN > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
