Steve wrote: >The advantage to USB CW is that ... it is often useful to hear > what's up the band as you tune higher. ...With LSB you would >hear the last station worked only if he was below your listening >frequency rather than above, especially if the signal is weak. For >serious DX chasing, USB CW is the way to go.
Very interesting, Steve. Thanks for the explanation. In my 36 years as a ham I've pursued mainly MARS, portable, rag-chew, sched, or casual DX/contest operation, the last to test antennas, usually. I'd never heard of a receive mode advantage for USB on CW before. Still, the advantage seems to stem from operation conventions for how a band is scanned and how the DX being chased offsets his receiver, rather than from a technical-based superiority. Perhaps playing around with reducing the value of RF-C66, C63, and/or RFC1 might get the existing K1 product detector crystal (X5) oscillation frequency (BFO) high enough to get above the IF frequency. Then you'd have to play around with the transmitter offset oscillator crystal (X6) and components (C62 and RFC2) to get the transmitter offset above the receiver zero-beat frequency rather than below it as it now is. Seems like an upward shift of just a couple of kHz would do. It doesn't seem too daunting...definitely possible, it appears to me. However, I've not seen any postings since the K1 came out in 2000 reporting that anyone has actually done this. Good luck, and post results if you try! > The present day LSB - USB band "standards" have their roots > from years ago... Frankly, I think in modern times it is silly to retain the convention of LSB on the lower bands except when old ham gear is being used. There's a lot of military surplus equipment available that operates on USB only. Forget using that on the lower ham bands without some non-original re-engineering! 73, Mike / KK5F _______________________________________________ Elecraft mailing list Post to: [email protected] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
