You can generate accurate 8970Hz frequencies from a single PIC DDS provided you clock it with a decent source to start with. The surplus market is awash with suitable oscillators as a reference, an
Hello Wolf, Stefan, Andy, Eddie, VLF. Tnx all for the info about generating a stable signal on 8970.1 Hz. I have here 2 other PC's/(older) notebooks where I like to do experiments with, and also on t
Hello Stefan, VLF, I think you are very lucky with a PC that generates such a stable signal. use the digimode frequencies given by the receive side i a stable trace. :-) > I tried two notebooks now.
Tnx Eddie, Lets see what happens from now on (11h00 UTC) I have now configured a continue test tone at 8970.1 Hz in that Digimode terminal. SR cal is locked at 22KC1 A few 100 mW of notebook audio in
Hi Eddie, No, I did'nt use that Digimode terminal to generate a signal, but just the Signal generator in that Components / Circuit window. 73s Peter. PA1SDB -- Original Message -- From: qrss@talktalk
Hi Peter, Which reference signal are you currently using? I think GBZ and GQD should be optimal for you. I'm using GQD for my 2nd VLF grabber in the moment. 73, Stefan Am 27.04.2012 13:12, schrieb PA
Hi Roger and group, I think Stefan has already answered most of the questions. Indeed you can (should) use the same instance to lock the sampling rate to a reference, and produce a stable output sign
Hi Eddie. Am 25.04.2012 14:54, schrieb qrss: Hi Stefan The expert has arrived, we knew it was simple "Expert" is very relative! Somehow we are all experts. But it feels strange to me to be called an
Hi Wolf, Am 25.04.2012 18:02, schrieb wolf_dl4yhf: Much easier and more reliable to build a dedicated hardware, clocked by a 10 MHz reference, using a PLL, DDS, or similar. Really easier? I have very
No problem Eddie. If it fails, "no man over board". (dutch saying :-) In the few weeks that I'm here, I did learn a lot about S.L. Locking, uHz, etc. And learn to have patience :-) 73's, Peter PA1SDB
Tnx Stefan, My 3rd experiment, a 10 year old notebook, ASUS PC has just (10h UTC) begun generating a trace at 8970.1 Herz. Lets see what happens in the next hours. I will buy such soundcard as you su
Hi all, Just soms experience story's. I tried 3 PC's now to generate a stable carrier on 8970.1 Hz. At (A) the test started with a 10 year old notebook PC. Width band trace as you see. At (B) a 2 yea
Am 25.04.2012 18:24, schrieb Stefan Schäfer: Hi Wolf, Am 25.04.2012 18:02, schrieb wolf_dl4yhf: Much easier and more reliable to build a dedicated hardware, clocked by a 10 MHz reference, using
Hello VLF, I like to do some local test here with Spectrum lab setings (and who knows, High ERP transmissions later :-) I have here a notebook that generates a signal with the Signal generator in Spe
Has anyone tried using an external USB soundcard with a separate locked clock? Most work from a 12MHz crystal which can be replaces with a GPS locked source without too much effort. But I can't help
OK Peter No 8.9kHz TX 'ing experts have replied yet so we are on our own at the moment. :-) 73 Eddie On 25/04/2012 12:12, PA1SDB, Peter wrote: Hi Eddie, No, I did'nt use that Digimode terminal to gen
Hello Peter, Stefan and all, From the curved traces visible in Peter's high-resolution spectrogram I'd say this thermal drift is normal for a soundcard. You may be able to shorten the initial time (a
Hello VLF, I like to do some local test here with Spectrum lab setings (and who knows, High ERP transmissions later :-) I have here a notebook that generates a signal with the Signal generator in S
Hi Peter, Am 25.04.2012 11:12, schrieb PA1SDB, Peter: Hello VLF, I like to do some local test here with Spectrum lab setings (and who knows, High ERP transmissions later :-) I have here a notebook th
Hi Stefan, The reference is tuned into ICV on 20.270 KHz. It looks like that 3rd PC that I test now is the best of 3 sofar. But it runs to short to see details. The TX PC is connected to a passive lo
