Fred, That is a 'trick' question - right? If not, read on - your loss in dB does not change.
There will be no difference in your feedline loss - the KAT3 does not change the loss on your feedline, it just makes the K3 happier. Now if you were tuning that antenna at its feedpoint rather than at the transmitter, it would make the difference between a matched feedline and one with SWR - that is the advantage of a remote tuner. If you are still interested in loss due to SWR (even if not applicable in this case), consult the chart in the Transmission Line chapter of the ARRL Handbook (most any edition). You will find that with an SWR of 3 and a matched line loss of 1 dB the additional loss is less than 0.5 dB - if the matched line loss is 4 dB, the added loss due to SWR is only 1 dB. Even at a 10 dB matched line loss, the additional loss due to SWR is only about 1.3 dB. The loss does not increase drastically due to SWR, it is the matched line loss that is the greater factor - that is why open wire feedlines work so well even with very high SWR. You realize a 3 dB gain by doubling your power, so the transmitted gain will be 3 dB - there is no change in the feedline loss (when expressed in dB). 73, Don W3FPR On 9/14/2011 3:58 PM, Fred Atchley wrote: > I have a K3-100 with KAT3 and a KPA500 w/o a tuner. I use an all-band > "Mystery" (similar to a G5RV?) wire antenna. Because of the KAT3, the K3 > "sees" a 1:1 antenna match which is good. However, I would like to operate > up to 200 watts out (low power) for the California QSO party. The KPA500 > tolerates a 3:1 SWR at 200 watts across the 20 meter band and in the CW > portion of the 80 meter band on the mystery antenna. > > My question is which option is the most effective, 100 watts with 1:1 or 200 > watts with 3:1? Keep in mind that both options use the identical antenna and > feedline. > > ______________________________________________________________ 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
