I have to agree with the reasoning behind John's comments here. As has been opined by many, the K3 really shines its brightest on CW, where spurious transmitter products are typically limited to the occasional key clicks. The percentage of misadjusted and badly offending transmitters is MUCH greater on SSB; I don't think anybody would argue with that.
That said, it's all a matter of arithmetic, and there are a lot of variables involved -- on both the TX and the RX ends. But all other factors being equal, how much is it worth to have the needed receiver dynamic range for that one must-have SSB contest or DX QSO that you wouldn't get without it? Many would say (no trademark infringement intended), "Priceless!" For most of us, that isn't literally true, of course. You do reach a point of diminishing returns with anything, especially in engineering. The K3, IMO, strikes what is just about a perfect balance between high-end performance and price. No other radio even comes close to the K3's price/performance ratio, as far as I can tell. Bill W5WVO ----- Original Message ----- From: "John A. McCabe" <[EMAIL PROTECTED]> To: "elecraft" <[email protected]> Sent: Tuesday, December 02, 2008 6:11 PM Subject: Re: [Elecraft] K3 & ADAT ADT-200A by HB9CBU > > > David Cutter wrote: > > Some folk suffer extremely strong QRM from broadcasters on 40m > > (particularly on the east coast of Scotland) and to them there is a > > real desire for the best possible gear to hear weak stations amongst > > huge bc signals from Europe. That's where receivers like the Perseus > > and others come in to their own. > > > > > > Hi David, > > Yes I can see your point, and I am certainly not questioning the benefit > of High Dynamic range receivers in those situations. I guess what I am > having a hard time understanding how it would be possible for any > receiver, regardless of the dynamic range of the receiver, to receive a > weak signal 2 Khz away from, say a 80db over 9 broadcast or other > signal. Would not the IMD, sidebands, and splatter from the broadcast > station itself be so severe as to prevent this? Or am I overstating the > effects of transmitted phase noise and IMD? As I mentioned in my > previous post, there is no way I could see operating 2 Khz away from the > very strong signal of my ham neighbor. His transmitted IMD would be way > too severe. But I can easily operate 20 Khz or more away with the K3. > To me, any minor difference in close in dynamic range between say the > Perseus and the K3 is of little or no importance in this situation. I > could not receive a weak signal so close to such a strong signal anyhow > because of his transmitted IMD. But the wider spaced number's matter a > great deal, and that is what concerns me when I see a 117-123db BDR as > compared to 140db at wider spacings. > > 73, > > John, KD8K > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
