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25997

Re: A world record for vlf35 at Forest, VA

... Coherent BPSK, EbNaut http://abelian.org/ebnaut -- Paul Nicholson --
Paul
Dec 11
#25997
 
25996
David L. Wilson
Dec 11
#25996
 
25995

Hum filter offline process

Posted in the files area in this forum under folder Glenn_Jolly the filter program hfx described below may be found. It is a zip archive (hfx.zip) consisting
glenn_jolly
Dec 10
#25995
 
25994

A world record for vlf35 at Forest, VA

Mike Smith at Forest Virginia now holds the world distance record for amateur radio communication at VLF, with a reception of a 17470.1 Hz message from DK7FC
Paul
Dec 10
#25994
 
25993

Re: Some filter code and e-field schematic current receiver

Hello Rick, Intermodulation (IMD) tests are not easy. Still they can be employed with an understanding that a certain amount is allowable. Even the act of
glenn_jolly
Dec 6
#25993
 
25992

Re: Some filter code and e-field schematic current receiver

Glenn, Glad to see that Yahoo Groups is finally stable enough to reply! Yes indeed the cascode FET receiver was definitely not running at a proper operating
forestradio
Dec 5
#25992
 
25991

Re: Receiver calibration using a low-cost GPS

Your calibrator and calibration procedures are very impressive. As is your screen shot of the W4DEX signal -- resolution of 69 microHz! That's about four
forestradio
Dec 5
#25991
 
25990

Re: Some filter code and e-field schematic current receiver

Yahoo Groups is finally stable enough to send a reply! Thanks for the note on the LT-1128; I blundered by not noticing its relatively low input impedance. I
forestradio
Dec 5
#25990
 
25989

Re: Receiver calibration using a low-cost GPS

Yesterday I calibrated the orthogonal loop rx delay and phase by the same method. The calibrator hooks up to a wire loop antenna
Paul
Dec 2
#25989
 
25988

Re[2]: [SPAM PROBABLE] Re: [VLF_Group] Todmorden receiver

Hello John / Paul Yes, I know EXACTLY how the old receiver and antenna feel :) Friday, December 1, 2017 ... -- Best regards, Chris
Chris Wilson
Dec 1
#25988
 
25987

Re: [SPAM PROBABLE] Re: [VLF_Group] Todmorden receiver

the problem when we get old! .... we're being replaced by younger, better performers .... life is tough, even for radio receivers 73's Paul John F5VLB ...
jm polard
Dec 1
#25987
 
25986

Re: Todmorden receiver

This afternoon I switched off the old E-field receiver, possibly for the last time. It's been running since September 2003. 14 years of Pennine weather, cattle
Paul
Dec 1
#25986
 
25985

Re: Some filter code and e-field schematic current receiver

Interesting results Rick. The intermod you are seeing in the cascode is likely coming from a nonoptimal bias or operating point. You should be able to
glenn_jolly
Nov 30
#25985
 
25984

Re: Receiver calibration using a low-cost GPS

I did a quick run with the calibrator this afternoon to calibrate the phase response of the new E-field rx. That means constructing an equalisation file, an
Paul
Nov 30
#25984
 
25983

Receiver calibration using a low-cost GPS

I'm hooked on the U-blox NEO-7N GPS chip at the moment. The particular module I use is this one, https://www.amazon.co.uk/gp/product/B06XXGJPVM There are many
Paul
Nov 30
#25983
 
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