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Strong Birdies in 75/80M
Posted: Thu Jan 20, 2022 4:35 pm
by Kriss - KA1GJU
I thought it was from my temporary desktop, but it appears it's within my 200D. It's a steady S-8 (-79dBm) at about 3938.5kHz and ever so slowly drifts low in frequency. I found a few more similar ones, on 2624kHz, 3283kHz and 4591kHz.
Any thoughts as to a remedy? Screenshots are attached.
Thank you,
73 Kriss KA1GJU
Re: Strong Birdies in 75/80M
Posted: Thu Jan 20, 2022 5:19 pm
by PD3LK
Hi, if you have the 6m pre-amp on then try to set it off. It helped me with my 7000
r/Leon
Re: Strong Birdies in 75/80M
Posted: Thu Jan 20, 2022 5:32 pm
by Kriss - KA1GJU
Turned 6M pre-amp off, no change.
Thanks for reply though!
73 Kriss KA1GJU
Re: Strong Birdies in 75/80M
Posted: Thu Jan 20, 2022 7:19 pm
by w-u-2-o
Moved: not an SDR Console topic.
Re: Strong Birdies in 75/80M
Posted: Thu Jan 20, 2022 10:10 pm
by Kriss - KA1GJU
OOPS! Sorry about posting in wrong location. Not used to this forum, I'm more of a Groups.io guy.
Anyway... any ideas from the folks here? Do all 200D's exhibit this behavior?
Here's the version:
- ver.png (28.24 KiB) Viewed 4649 times
73 Kriss KA1GJU
Re: Strong Birdies in 75/80M
Posted: Fri Jan 21, 2022 2:02 pm
by w-u-2-o
The 6M preamp will have no bearing on this problem given that it is on 80M.
As far as I know, nobody has ever experienced an S9 birdie (internally generated spur).
I see you have run the unit into a dummy load. Have you also tried running the unit off a battery instead of a power supply?
Re: Strong Birdies in 75/80M
Posted: Fri Jan 21, 2022 11:20 pm
by G3ZQH
On my 200D I do not see any of these spurs with a dummy load in place. There are no spurious emissions at all that I can see in this range. Peaks of that size are more likely to come externally rather than from the rig. Or possibly a fault in the rig?
73 Dave G3ZQH