High readings at FSM19
3 months 2 weeks ago - 3 months 2 weeks ago #5812 by FSM19
Last edit: 3 months 2 weeks ago by FSM19.
- Posts: 135
- Thank you received: 15
3 months 1 week ago #5835 by Sonarflash
Hi, VA7BDG. I had this problem a few years ago. My GM tube/USB interface kept getting high readings when I was on 20M. Solution was to make a Faraday cage of aluminium foil inside and outside the USB module ABS box, and add an extra layer of well-grounded coax shielding braid to both cables and the aluminium. Problem solved.
The following user(s) said Thank You: FSM19
3 months 1 week ago #5836 by FSM19
Thanks for your comments. My probe is in a copper foil covered abs box now. The last problem seems to have been caused by an old Codar CR-70A that used to belong to my late father (G4ZPV). I recently got it working again, but there was a problem with the break-down of the electrolytics in the power supply, causing pulses. Anyway I'm doing a total change of setup here.
3 months 5 days ago #5838 by FSM19
3 months 4 days ago - 3 months 4 days ago #5839 by Bert490
Last edit: 3 months 4 days ago by Bert490.
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