Hello Paul, I'm guessing that you've considered all of the below but just in case: Erratic power supply startup related to the comparatively high source resistance of long wires and associated connec
When I checked the data sheet for the IP1215S isolating DC-DC converter I spotted that it said max 47uF load capacitance - and I had 100uF hanging on each rail. Hopefully that's the answer. For some
Hello Paul, Based on the those additional details, it might be worth a quick check of the voltage-loop stability margin: if for example your load draws 50 ma, briefly add a 390 ohm 2W resistor across
The re-built E-field rx was put outside this afternoon for a on-air trial. Pre-amp inside the antenna tube http://abelian.org/vlf/tmp/171129a.jpg I'm a bit worried about noise from light getting into
Hello Paul, By noise from light do you mean shot noise from the average solar flux? I tried a quick calculation yielding < 1 nV/rt-Hz, and I guessed that your noise voltage density is more than 10x t
Thank you very much for the details on your fine receiver Paul Can you explain what's vcat++ ? I'm missing something here. Probably you explained that before :( 73 de Luis EA5DOM
You can listen to the rx through the link http://78.46.38.217/vlf1.m3u The wind has picked up a bit today and there's a scratching crackling noise appeared. Something mechanical by the sound of it. I
Am 30.11.2017 11:48, schrieb Paul Nicholson: vtcat is a program in vlfrx-tools which moves signal streams around and maybe changes the sample format. The ++ option specifies a network connection to s
New H-field rx is coming along well. Design changes are completed - it has a lower system noise, wider bandwidth, significantly lower common mode response, and a much better line driver. Like the new
Thank-you for the update, Paul. It't amazing that 10 uW can be detected over there - almost like spooky action at a distance, with only a few hundred billion photons per second. The carrier is phase
Hi Joe, Am 05.12.2017 13:15, schrieb [email protected]: The carrier is phase stabilised by Spec Lab so the tuning coil can be peaked without glitching the phase and the current is also periodically adjus
Sounds good! What do you estimate, what is the 'gain' on 2970 Hz relative to the old system from the last season? Soon there will be a signal on 5170 Hz again. Next week at the latest. 73, Stefan Am
Ground to a halt this weekend on the new H rx, waiting for parts. There's always something that's out of stock! http://abelian.org/vlf/tmp/171210a.jpg I decided I could fit both pre-amp and line driv
Parts have arrived so I can continue now with the new 2-chan H rx. Meanwhile, the new spectrogram is more or less working properly. http://abelian.org/vlf/fbins3.html Thanks a lot to Markus for advis
I think I've got the Hann window working now, it looks a lot better and sharpens up the spectrogram quite nicely, eg http://abelian.org/vlf/fbins3.html#p=1512457200&b=285&s=sp&m=cardioid&w=h&c=1 Than
Sadly this appears as boxes with a blue background without spectrogram. Is there something I can try? Hopefully there was another message last night. 73 Joe I think I've got the Hann window working n
Joe, Paul Works good here on both XP/SP3/Firefox and Win10/Firefox. Impressive stuff Paul! Jay W1VD WD2XNS WE2XGR/2 Sadly this appears as boxes with a blue background without spectrogram. Is there so
Same here but after waiting a minute or so the spectrogram fills in with data and everything works. I think it needs time to download or process data? Firefox Quantum 57.0.1 on Ubuntu. I must say alt
Thanks Dex. Inpressive indeed! Joe Joe, Paul Works good here on both XP/SP3/Firefox and Win10/Firefox. Impressive stuff Paul! Jay W1VD WD2XNS WE2XGR/2 -- Original Message -- From: <[email protected]> To:
