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Posted by: wb8rcr, John Posted On: 11/18/02 Subject: Re: New to QRP Message Posted: In Reply to: New to QRP posted by KC0OFK on 11/13/02 Someone asked about the feedline. If it's coax, and I assume the tuner is at the transmitter end, 70 feet of coax could present a significant loss, especially at 10 meters. Remember, the SWR at the antenna (which your tuner doesn't affect) influences the feedline loss, A LOT. The loss goes up as the frequency goes up. If you are using RG-58, there may not be much of anything making it to the antenna at 10 meters. I'm personally not much of a fan of open wire, but then I like resonant antennas. If you are using an antenna like the G5RV, which is going to present a high SWR, you really need to consider open wire for it's low loss. Also, where do you go looking for QSOs? It's usually pretty easy to come up with a contact near the QRP frequencies. If you are in other parts of the band, people will assume that you will fade pretty quickly due to the weak signal and won't come back to you. You need to be a little more cagey to nail them if you're operating at 7010. 5 watts means more the higher you go in frequency. Aside from the possible feedline loss, 5 watts is almost as good as a KW on 10 meters. On 40, there's a pretty big difference between 5 and 100. Operating on 10 when it's open is usually a pretty good strategy, so there must be some problem if you are having trouble. |
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