Dear Jim & the LF group Jim wrote: It would take a little care to implement though; if the drive to only one of the totem poles was varied in phase, changing the output amplitude would also change th
73 Alberto I2PHD Dear Alberto, LF Group, "Totem pole" = 2 transistors in series with the top one connected to +ve supply rail, the bottom transistor connected to the -ve rail, and the output taken fr
if the drive to only one of the totem poles was varied in phase, changing the output amplitude would also change the output phase, introducing up to 90 degrees unwanted additional phase modulation i
I am not familiar with that totem pole scheme, but, isn't it dangerous to drive a totem pole with 0 degrees ? Wouldn't both the Fet (transistors, whatever) be brought in conduction state at the same
At 14:12 29/01/2002 +0100, Johan wrote: ...Perhaps I am missing something, but as far as I can see, the waveform *will* be symmetrical if the drive to each totem pole has a 50/50 duty cycle and the m
Dear Jim and the Group I tried some experiments with a scheme similar to that suggested by Johan - The problem with this is that, while the square wave output contains essentially no even harmonics,
Dear LF Group, Many thanks to DL4YHF for the speedy software update; I hope to do some tests on PSK31 some time in the next few days. About using BPSK modulation with the Decca TX:- The phase keying
