It would depend on the supply Bill. I know very little about computers (except they waste my time), but I work daily with circuitry used in power supplies. Most AC line operated switching supplies r
Hi Bob, I agree that most switching supplies don't care if the input is a sine or square wave (as long as peak voltage is within range of the regulation system), but I disagree strongly with the sugg
I'm "doing" a keyer for contesting and general ragchewing, and I have a contest related question. The keyer has a LCD display that displays what is being sent either through the paddles or from a com
I'm going through this now, rewiring for the contest this weekend. While I don't have a "real" contest station, I have a large 160 station we are using in a contest. I have six separate lines of rece
Hi Rich, Even hearing ONE signal would be very unlikely as a transmitter fault. It is very unlikely to be a transmitting station fault because there are an incredible number of tuned circuits between
I generally work more JA's on a non-contest day then we worked in the contest. We worked about a half-dozen or so, when typically about a dozen or more are available most days of the week. Part of t
In fairness, before anyone runs out and buys an R4C, the R4C's we used here on 160 that Bill talked about are far from stock. For first mixers they have either dual-triode single-balanced mixers (6J6
Hi Dick and all, If this is too long, skip to the end. I have a constructive suggestion that might be fun and educational. Most radios fall apart somewhat at close spacing. The ARRL announced on the
Hi Clive, I hate to bring bad news, but..... I have no idea what RADCOM measures, but QST reviews do not measure CW bandwidth.... nor do they measure SSB bandwidth with valid modulation envelopes. Pr
This extract is forwarded from the topband reflector discussion. My only comment is to look at the cheap Elecraft K2 and use it as a comparison to high-dollar radios. These numbers don't tell everyth
Often I just listen in contests. Hearing both ends, it is very plain QSK is not always the issue. Quite often the other person doesn't even wait for the first person to finish!! 73, Tom (W8JI@akorn.
Would it be feasible to use the same test setup that ARRL uses for The problem is to measure bandwidth the analyzer must have a much narrower filter than the bandwidth you are looking at. So if you w
Hi Dale, Part of the reason people see this problem differently is because of noise floor at their location. If the noise-floor is high, clicks and splatter are masked by the noise. You can also use
Looking at signals here, what happens is if I have "rough noise" narrow filters can ring and lengthen the noise pulses. In some cases, like during QRN from thunderstorms, I find no AGC and a wider f
Rise and fall times are only a small part of the bandwidth issue Tony. Synthesizer settling and bounce can be a major player. PSK people try to sell it based on how narrow the mode is, and yet it ha
I've heard that difference in a 775DSP when on QSK and on semibreakin. At least some 775's let out a "thump" on the receive frequency and between the receive frequency and transmit frequency. When y
Hi Wally, Please, no more new SSB contests on 160 meters unless the rules require people to follow regional bandplans!!! While 160 SSB contests are probably always going to be problems, forcing NA st
Sometimes receivers are the problem, but much more often it is the transmitter. My FT-1000D was terrible for close spaced signals, because Yaesu left the noise blanker's amplifier run full-tilt when
Hi Ward and all, There is no standard in dB for modulation products. Radios do not require type-acceptance, only external power amplifiers. The number everyone thinks of is for harmonics and problems
Clicks are like hydrocarbon emissions. Most people don't care if they have them, and neither do the manufacturers, until we all start to choke on the bad air quality. Factually, not emotionally, it