You probably already do this or something similar, but what I do is drive a NPN transistor with a signal generator. I tie the collector to the manual key input, and of course the emitter is grounded
<snip> The main marketing guy at ICOM, perhaps four years ago, told me "no one works CW, it is a dying mode" and "there isn't any chance we will change the software, the ratio control is fine". Whil
Hi Steve, Respectfully, that is why we should look at it with a scope. The IC- 706 (and the 775DSP I had) does not just truncate dits, it truncates the leading edge of EVERY element, both dots and d
Sure appears that way. neighbor. Actually that is still about half the rise and fall time needed. I don't know where the rumor comes from that excessive bandwidth somehow results in "cutting QRM or
Hi Paul, Look for it and let me know. I have the CCIR data, and at 35 WPM under severe fading you might start to notice a change once in a while during fades, but that would only be true if receiver
I use the most selectivity possible (but almost never less than 200Hz) unless the signal is buried in rough noise. The reason is S/N ratio is directly proportional to selectivity, and my brain has l
Hi Lee, I see what you are describing now, and it should be clean CW. Waveform is VERY important, more so than rise and fall in most cases. I'll try to do a better job of explaining, because I still
I certainly wouldn't adjust a roller inductor while transmitting near the tuner's rated power, but virtually any roller inductor can be adjusted while transmitting at reasonable power levels without
That's why it is called a raised-sine in this application, since it starts and stops at zero slope. The key to all of this is bandwidth. Assume we start with a square wave from a key and we filter i
Sounds like exactly the same problem ICOM has in some radios. If you do a make-only delay, you also will have to stretch the signal from the key input to restore the weight. That shouldn't be difficu
I haven't been following this closely, so forgive me if I repeat something that has already been said but...... The most effective processor is a split-band audio processor, assuming you can keep the
You miss the whole point of the multi--band clipper then, if you think it has harmonics or IM distortion at the output. 73, Tom W8JI W8JI@contesting.com
That is not true by any observation I have gathered in well over 50 tests when my signal was weak on 160 meters. I now use a waveshape that is similar to a sine rise and fall, and no one so far can
I think we have, through poor planning, made life miserable for CW ops on crowded bands. Let's look at this in proper perspective: I listen with a 440 Hz tone mostly. A 1.5 mS rise or fall time woul