Jim Danehy wrote: > I own K3 # 3355. Love it. Only thing I do not have is the digital > recorder and the sub receiver. I am considering the sub receiver. I > read in the operating manual that there is a -3 db loss when both > receivers are using the "splitter" (common antenna). Is that > interpretation correct ? I would probably not be using two antennas > except on 160 and 80 which I operate sparingly in the winter. If I > use the sub receiver and the main receiver from the same antenna can > you notice the -3 db loss ? As we know that is a halving of the > signal. One db is the lowest difference your ear can detect.
Hi Jim, This is correct. Virtually all true dual-receive implementations use a 3-dB splitter to route the signal to both receivers while preserving impedance match. Most of the time you won't notice the 3 dB loss. It would only come into play on a band where both the noise and signals are extremely weak, and if it's an issue, you can turn the sub receiver off or use a separate antenna. You'll want a separate antenna anyway so you can use diversity receive, which works amazingly well in fading conditions. 160 and 80 meter operators in particular use this technique. I'd suggest matching the crystal filters on the main and sub receivers, at least those you might be using for diversity receive. 73, Wayne N6KR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
