Hi Don, The IC-756Pro "rumble" is a known problem; the cause is leakage of the noise-blanker drive signal, via the +8V supply rail, into low-level receiver AF stages. There is a specific fix: http://
Dear Uncle Mike, <<The industry has a host of rigs that were dogs>> "Pigs", please, if you don't mind. Tail-wags, 73, MacGyver (Adam VA7OJ/AB4OJ's Golden Cocker) http://www.qsl.net/ab4oj/macgyver/mac
Hi George, Yes indeed...just shows you what can happen when one leaves one's best buddy at home alone with a copy of "ye compleate Workes of Christopher Marlowe"... Cheers for now, 73, Adam VA7OJ/AB4
Hi Mitch, By the time the NTIA signs off on 60m, the ITU designates it as an amateur band world-wide and the FCC authorises it, at least 10 years will have passed - by which time most of us will have
Hi Don, Actually, since Riley Hollingsworth came aboard, the FCC's fairly rigorous enforcement policy has helped clean things up quite a bit on the US ham bands. The big problem is pirate operators,
Hi Dave, Neat idea - an I/Q image-reject mixer down-converting to ZIF, and driving a DSP (as in the Collins 95S-1). One needs a spectrum analyser to keep it clean, though. Cheers for now, 73, Adam VA
Bill, Here in Canada, we have IARU Region 1 and Region 2 amateur-band allocations. This means that there are no subbands by emission type/usage in the US sense. Our radio regulations specify maximum
I would add one more line: Q: What is the function of the DSP stage? 1. Makes the radio sound better 2. Everything George says about it 3. Everything Doug says about it 4. No one knows but it sorta w
Mike, They already have, and will continue to do so inexorably. "Technology has only two degrees of freedom; forwards and down. There is no backwards." Cheers for now, 73, Adam VA7OJ/AB4OJ When are t
Hi Tim, ICAS = Intermittent Commercial and Amateur Service, as compared to CCS (Continuous Commercial Service). These two service types were first defined in the power-tube industry. The classical de
For those who are interested in learning more about the basic concepts of Software Defined Radio (SDR), here is a link to an excellent White Paper on the subject. The document is of a general nature,
Hi guys, Yes, I shall be the first to admit that this is totally off-topic (and off the wall). Nonetheless, it should serve to inject some badly-need levity into the proceedings... On Jaguars (prior
Hi Scott, If you are an ARRL member, you can download the ARRL Test Procedures Manual (PDF). http://www.arrl.org/members-only/prodrev/testproc.pdf Cheers for now, 73, Adam VA7OJ/AB4OJ Where can I fin
Hi Duane, << Icom IC-756ProII...An internal heatsink, - why put the single largest and most variable heat generating source's heatsink inside the radio? >> The entire heavy, die-cast light-alloy chas
Hi Tom, George, I fully concur with your remarks. There are several issues at play here: The typical -20dB carrier set point on the filter flank in a conventional filter-type SSB generator serves two
Hi Tim, It hurts to admit this, but I believe that in the matter of CW capability we are up against the ugly realities of the marketplace. The amateur segment is only a part of the major Japanese rad
Hi George, <<< It primarily is a result of the time it takes for the phase lock loop to lock. >>> << That is included in the overall 10-msec delay. I wasn't aware that you are so intimately familiar
Ken, The qrz.com server appears to have a problem. It responds to a ping, and its domain name resolves correctly to an IP address, but it will not accept an HTTP GET command. It is possible that the