Hi Chris, Am 14.11.2015 21:00, schrieb Chris Wilson: OK, but what about wire breakdown voltages? In all the big air cored LF tanks I have seen the windings are well spaced on ceramic, or Paxolin type
Hi Luis, Am 14.11.2015 08:40, schrieb VIGILANT Luis Fernández: Thank you for the QSO too. You were booming here 599. Easy copy but I still have to train my ears a bit, not to get "false or nill decod
Hi all, After some days, the 630m band opened for TA paths again. Best TA reports from last night shown below. Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az 2015-11-19 05:02 DK7FC 0
Hi Chris, I would avoid doing this step. It may be comfortable but it's hard for most relays to carry RF currents of a few ampere and voltages of a few 10 kV :-) There may be some vacuum relays thoug
Chris, Yes, HV relays for DC or 50 Hz may not work properly: https://www.youtube.com/watch?v=hIkNY5xjy5k 73, Stefan Am 19.11.2015 13:44, schrieb Andy Talbot: Alan - You're forgetting the loading coi
Hi Chris, I would assume such a large HV switch and the whole construction adds a few 10 pF to your system. This C has of course no radiation resistance. So this lowers your antenna efficiency a bit!
Hi Tom, Do you know that the OM is subscribed to this reflector? I thought he isn't. Or do you want to tell us that you've made the QSO? :-) In a QSO he asked how we could rise mor (CW) activity on M
Hi Paul, You seem to eat a lot of ice! :-) Interesting image :-) 73, Stefan Am 20.11.2015 21:00, schrieb Paul Nicholson: Contemplating building a receiver for LF. I probably have all the parts. First
Oh, Luis, that's a pity! Can't you run the TX during your trip? Controlled with your smartphone and Teamviewer? That's how i do it :-) BTW, I'm in contact with EA8BVP now (too!). 73, Stefan Am 20.11.
Hi Luis, Excellent! Thanks for your work, activating so many OMs everywhere arround the world. Most OMs seem to know nothing about the great fun below 500 kHz. So there is a LOT (!!) of potential for
Hi Chris, I took a separate floating power supply to build this circuit, a simple transformer (10VA), a bridge rectifier, electrolyt capacitors, voltage regulators, you know, the traditional stuff :-
Hi John, Yes, his LF system is active all the time. Unfortunately i am not ready to TX on LF these days. I put his adress into CC so you can contact him. 73, Stefan Am 22.11.2015 16:38, schrieb John
Am 23.11.2015 20:28, schrieb Paul Nicholson: [...] It would be great to see some VLF activity. Very little sign of amateur activity seen here lately. Except for http://abelian.org/vlf/fbins.shtml#p=1
Hmm, Use Spectrum Lab with a GPS reference signal, compensating the soundcard drift, and a GPS-locked mixer and you're down in the 10 uHz range and also ready for nearly any mode used on the band! :-
Hi Domenico, What about a test in EbNaut on VLF from your location? I would watch out for you and learn how to use the software on VLF. Ah and what about Markus? Ah, oh, and i remember i have a large
Hi VLF, Who is testing on 8270.0000 Hz? Uwe/DJ8WX? It is a stable signal since many hours... http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html 73, Stefan
Ok. Large is relative. I mean something that can be run from a normal 230V mains socket :-) (single phase!) It would be easy to build a transformer, a termination resistor, a MOSFET driver IC as a si
Hi John, We all know what we're doing! Apart from the availability of a tree phase supply (nearly every German household has a three phase system available, for the kitchen oven at least, which an be
See for yourselfe: http://wsprnet.org/drupal/wsprnet/map You need to edit the settings below the map to 630m and say the last 6 or 12 hours. 73, Stefan Am 28.11.2015 20:51, schrieb Mal Hamilton: Any
