13 Jan 2017

472kHz WSPR RX on PC battery power

For the last few minutes I have been on 472kHz WSPR RX using the shack PC on battery power. Without the SMPSU charging the noise floor is 7-S points lower and already I have spotted LA8AV (1035km) and lots of others. The lower noise floor is amazingly lower.
at 22:16
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1 comment:

Alan G8LCO said...

Well Done Roger!!!

You might find choking the Laptop output lead with a ferrite ring helps. Choking the antenna common mode style can also be very beneficial.

Laptop supplies vary a lot, older ones can have part dried out electrolytics, the output filters - often two 330uF/25V cans can be the issue. They should only be replaced with a very low ESR high ripple type, common general use types have much higher Z at the frequencies we don't want.

Congrats again!

Alan G8LCO

Sat Jan 14, 01:50:00 am GMT

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