Hi Gary Yes I see Jim 'tunes' his loop after the coax feed or is it HF filtering. My Loop is 800mm sq 50 turns and 3.6mH according to rjeloop. I am using SpecLab and PC 73 Eddie . On 05/03/2011 18:5
Hi Gary Thanks for the reply, first thing, for "10dB hump at 8.9kHz" read 20dB. Direct coupling of coax to the feed was killing the Q, I have added a 4 turn coupling loop. The flatness was only reall
Hi Eddie, Yes, you will need a pre-amp, don' forget that the E-Probe has a pre-amp. I advise you to build the M0BMU VLF pre-amp with 7 to 10 kHz band-pass filter, circuit attached. 73, Gary - G4WGT.
Hi Gary Yes I see Jim 'tunes' his loop after the coax feed or is it HF filtering. My Loop is 800mm sq 50 turns and 3.6mH according to rjeloop. I am using SpecLab and PC 73 Eddie . On 05/03/2011 18:52
Hi Gary Thanks for the reply, first thing, for "10dB hump at 8.9kHz" read 20dB. Direct coupling of coax to the feed was killing the Q, I have added a 4 turn coupling loop. The flatness was only real
Hi Jim Thanks for that, I knew we could depend on an analysis from you. You confirm my thoughts and findings, I went for a step tuned, low loss loop, I get 20dB gain around >1kHz wide on tuning to 9k
Dear Eddie, Gary, LF Group, The loop is tuned, but is very low Q, and has more of a low-pass response really. It was done this way partly in order to obtain a wide bandwidth around 9kHz, which allows
Hi Gary I am testing a very similar loop to your 1.1m square, mine is 800mm sq. and uses Litz wire. Results at the same hight as my E-Probe are disappointing as yet. I have no pre amp on it, and am w
You can get much higher signal voltage out of the same loop antenna by changing it to a high Q resonant design. I guess with the relatively high impedance load of the sound card input (several kohm)
