Am 28.12.2013 23:33, schrieb Markus Vester: [...] PS Any progress on bypassing the divider in your VLF transmit chain? Aaah, no, i forgot that. So i cannot transmit OP32 on VLF because it would be in
So i cannot transmit OP32 on VLF because it would be incoherent Ah-so reverse engineering in D land , means going back in time , now it makes sense ...back to basic's , like re inventing the wheel !
My suggestion: Use two outputs from the stereo soundcard: An "amplitude" and a "phase" channel. The output from the phase channel will be a square wave, coherent, constant amplitude, fed to the divid
But what about the balance factor ?, that could be a 'loop' hole in the law : ) From: [email protected] Markus Vester Sent: Sunday, December 29, 2013 12:37 PM To: [email protected] Subj
Hi Wolf, Am 29.12.2013 12:18, schrieb wolf_dl4yhf: Hello Markus, Ok .. i had assumed the problem was the flipflop (or binary frequency divider) which would be in an unpredictable state when not fed w
Hi Markus, Thanks for the ideas. Well, the PA needs and has a separate PTT input anyway, for flexibility reasons. So i may just use the VOX circuit. 73, Stefan Am 29.12.2013 11:33, schrieb Markus Ves
Hi Stefan, Not really... the design goal was driving the PA with the 13.8 V, "20 ampere" power supply. There actually is some stray inductance (despite using 17 mm wide copper foil) so the load "seen
Hi Stefan, here's a quick sketch of how I would go about it. You wanted XORs so here's one with XORs ;-) But in this circuit they serve basically only as inverting or noninverting opamps, depending w
You're right Graham, we're reinventing the wheel... Amplitude modulation with carrier phase jumps is much like a cart with square-shaped wheels. We found that we could go further by rounding off the
Ok Wolf, you're right. That is a simpler solution, requiring only minimal hardware changes for Stefan. One channel sends a continuous uninterrupted 17.94 kHz tone to the divider, the other channel co
Hi Wolf, I think Stefan was only trying to solve the simpler problem of generating a dual squarewave drive for his VLF PA, and was not aiming for amplitude modulated output yet. So when he transmits
Hello Markus, Ok .. i had assumed the problem was the flipflop (or binary frequency divider) which would be in an unpredictable state when not fed with a phase-coherent signal "in the gaps" (zeroes i
Ah but Wheels need to have 'Type approval' in DL , so may not be legal to modify the square ones ... From: Markus Vester Sent: Sunday, December 29, 2013 11:48 AM To: [email protected] Subj
We Germans are currently lobbying the Eu parliament, which will ultimately but forth legislation enforcing round wheels everywhere (including UK ;-) From: [email protected] Graham Sent: Sunday,
