A modern PIC like the dsPIC33EP32GS202 (which I am currently playing with) can possibly be used for that purpose. It has a multiple high-speed PWM outputs which can be programmed for periods and puls
Hi Andy, It was me, using a PIC16F1783 with 1 MBaud on an FTDI-based interface. At higher bitrates, there were occasionally lost samples depending on the CPU load of the PC. So it wasn't a problem wi
Hi Warren, It's not strictly the Weaver method but there is an SSB 'up-converter' with I and Q outputs in SL. It actually uses a forward and inverse FFT, and cos^2 windowing (with 50 percent overlap)
Well the main purpose of the filter is filtering. Letting it produce an I/Q output is more or less a by-product, and it works extremely well. Am 14.04.2016 um 19:54 schrieb Andy Talbot: That seems a
Hi Domenico, It's important to turn off 'differential encoding' in the digimode terminal. Most PSK-modes have that option set by default, but for Ebnaut it must be cleared. When you set the symbol ra
Ummh.. why am I thinking about Sesame Street now ? http://www.amazon.de/Butlers-BUTLERS-ZINC-M%C3%BClltonne-Oskar/dp/B006IFQW5S/ref=sr_1_1?ie=UTF8&qid=1461530074&sr=8-1&keywords=m%C3%BClltonne+metall
Hello all, I can confirm such a single-turn loop with a big ferrite transformer works well - even with a very simple amplifier. Construction details and a few spectrograms at : http://www.qsl.net/dl4
Greetings all, Interesting application .. but wouldn't the operation of such a simple transductor (wound on a single ferrite core) depend a lot on the 'RF drive' itself, and / or have different influ
Hi Tom, Ah, i see.. thanks, I missed that on the photo ... so there won't be kilovolts of AC on the DC exciation coil. Or, depending on how the ring core is oriented in the "mostly air core" coil, th
Hello Dave, By coincidence, one of the developers of SDR-play recently asked me if I'd like to have one of these devices to add support for it. Since I cannot devote lots of time for it, my suggestio
Hello Tobias, Dave, and the group, Great, thanks Tobias - in that case, Dave doesn't need to fool around with virtual audio cables etc. After installing the ExtIO-interface, you can select ("install"
Hello Stefan, Michel and all, In fact the 'EbNaut recorder' configuration doesn't use the FFT for decimation. But it uses the same class of pre-processing to decimate the sampling rate for the record
Greetings all, PSK31 is technically speaking BPSK. But G3PLX doesn't like that name (as he once explained to me, long ago) because there is only "one real PSK31". Ok, there is an experimental QPSK31
Hello Jim, I still wonder why the sync pulses from the Thunderbolt E are so short - you mentioned 10 us in your email, but what is the exact pulse length ? With a slightly modified software (SL) it m
Hi Chris, Whow, that's a nice "mass grave" of logic ICs ! - yes of course, you can use the 1 Hz output. If it has a 50 % duty cycle, it will look just like a 500 ms long sync pulse to the software. I
Hello Jim, Ok thanks for the details. The reason why the Trimble's "Dirac-like" sync pulse didn't work with SL is because SL expects a 'nice' rectangular pulse. It needs that to find out if the sound
It will possibly work if the software (SL) would not expect a 'normal' rectangular pulse, look for the "valid" low->high transition (because some cards have the bad habit of inverting the polarity),
Hello Bill, Nice to hear from you again. Indeed it's a good point, if the GPS isn't only used for frequency calibration but also for absolute timing. I looked at Paul Nicholson's principle of centroi
Hello Jim, I wouldn't give up on the Thunderbolt E yet. A double-ovenned 10 MHz sounds intriguing, you should have a very low phase noise which other GPSes (clocked by a cheap 'computer grade' oscill
