Don't know about the PRO II, Steve. But, I am getting confused here - nothing new! <:} When I hold down the dit paddle at almost any speed and look at the r-f output envelope with a scope, I see almo
Neat setup, Tom - I'll have to try that . . . thanks. Well, I have only the PRO to speak about, but it is just about the same as your 706! I just got through running some scope checks and monitoring
Ran some more tests last night using the CW function/mode of MixW 2.02 as a keyer. It is the only program I could find that has actual "weighting" as an option. Default is "0" which does not change t
Tim, I guess that Steve and I and others are guilty of tossing around terms that have a special meaning in the world of CW that might be different elsewhere. "Heavy" as applied to keying means that t
Excellent, detailed and informative posting, Lee - thanks for another view of this interesting topic. It seems that there are two major keying differences between your TT Jupiter and my Icom PRO: (a)
An example of the effect of "soft" keying can be found in the CW ID used by most PSK31 programs. They use the same raised-cosine function to on/off key the carrier as used in the phase shifting. I fi
And the merits of inputting transmit audio into the balanced modulator are equally impressive! 72/73/oo, George W5YR - the Yellow Rose of Texas Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
At Tom Rausch's suggestion, I am posting the following results of examining the CW ID keying waveform of a popular PSK31 program (MixW) by scope to determine the rise and fall times and to examine th
Carl, you have pointed up both an error and an omission in my overly long treatise. First, you are entirely correct: I said 90 degrees when I meant 180 degrees, or more correctly the appropriate half
Tim, as long as you listen to the PRO receiver with either phones or speaker through the crappy internal analog audio system you will not be getting anywhere near the sound that radio is capable of p
Mark, historically speaking, processing at audio baseband has not proved to be all that effective in enhancing articulation and improving effective S/N for SSB signals. True, it can be highly effecti
Well, the abrupt phase shift implemented with on-off switching of phase would not distort the PSK31 signal within its occupied bandwidth as much as it would create very large and far-reaching sideba
Thanks, Carl - I believe I got my first one in the late 70's and borrowed a friend's Vomax to make comparisons. I picked up what appears to be a brand new one at some flea market for about $15 which
I correctd a similar problem with my NIR-12 by changing the time constant of the bypass relay control circuit - think I just changed a cap in the circuit. After that it works fine. I use it outboard
Soft compressors and clippers have been used for years and are effective for FM and AM modes, but can have limited effectiveness for SSB. The problem is that if the processing is made aggressive enou
John, I was unaware that the Pegasus used any user-installable conventional crystal filters in the 455 KHz IF chain. There is a fixed bandwidth crystal or ceramic "roofing filter" there, but it is mu
I, too, used the famous Heathkit long and narrow hand mic back in the 70's on an HW-101 mounted in the car. Not only did it sound good, but being ceramic, it could stand the heat of a closed car in T
Bottom line, I expect to see a lot of the concepts that originated in the Kachina 505 DSP to see light again in the Orion! 72/73/oo, George W5YR - the Yellow Rose of Texas Fairview, TX 30 mi NE of Da
Dan, the Jupiter must be a remarkable radio indeed. How come you are hearing the birdies or whatever if they are below the noise floor of the receiver? Not yanking your chain, just curious as to how
Very true, Carl . . . I think that it helps to recall that the "SWR bridge" in any rig is actually serving only to give an indication of when the transmitter is loaded to its design load, usually 50