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[linrad] Quietening computer noise
I have managed to recieve signals on HF using two SBL-1 mixers driven by
a quadrature LO (AD9854) and a couple of low noise opamps (NE5534).
Linrad runs in direct conversion I/Q mode. The main limiting factor at
present is noise from both computer and monitor.
The sound card is bog standard and the machine is a PII 400 MHz running
RH9, but with only 64MB of RAM
The max filter bandwidth appears to be about 2 KHz on SSB, and narrower
on AM - if I try to make it wider nothing happens.
Is this due to RAM and processor limitations?
How to get rid of that computer noise? ( I have made no attempt whatever
Thanks in advance