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Supreme Being
Group: Forum Members
Last Login: Tuesday, January 17, 2012 4:25 PM
Posts: 215,
Visits: 503
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(SDR-1000, D44, win XP sp2 )
Numerous SVN of test and trunk over the last 2-3 months have given me random periods of what sounds like RX intermod or possibly mis-adjusted noise blanker even though NB was not enabled. In most cases, it sounded like splatter from a station Khzs away and in a few cases there was a rise in the panadapter noise floor across the whole display in sync with the amplitude of a strongest signal. I don't think it is a hardware problem because I can toggle VAC button off-on-off or on-off-on and the "intermod" goes away. I can not reproduce this at will and I have been unable to determine its pre-cursers...
Has anyone else seen this ??
AL, K0VM
AL, K0VM
SDR-1000, Flex5000, Flex user since 2006
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Forum Newbie
Group: Forum Members
Last Login: Tuesday, May 12, 2009 2:25 AM
Posts: 9,
Visits: 117
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It seems to always occur during these conditions:
1. Filter = 1 khz.
2. NR (noise reduction) enabled.
3. ANF (auto notch filter) enabled.
4. ambient noise level >S4 (on the meter)
The 'splatter' noise seems to follow the bounces of the S meter.
No signal needs to be in the filter passband or near the tuned frequency.
The 'splatter' noise sometimes occurs while listening to SSB signals if the NR and ANF are activated.
PowerSDR v1.11.0 SVN:2235
5000a
P4 3.0 ghz, 3GB ram, hyperthreaded processor
WinXP Pro SP2
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