Topband: BCB Interference

[Guy Olinger K2AV]

MF Broadcasting stations often change patterns and reduce power at
night due to onset of distance propagation.  A receiving high pass
filter that passes 1.8 Mhz and up should do wonders for you.  73, Guy.

On Mon, Apr 5, 2010 at 8:55 AM, Luciano Gasparini Nachif
<luciano_nachif at yahoo.com> wrote:
> I recently installed a Perseus SDR receiver. Last Saturday afternnon, myself and PT9IR were playing with it and noticed a very strong noise all around HF.
> I decided to concentrate our efforts on 40 meters as we could rotate the yagi in trying to spot the noise source.
> We also installed an AT-130 antenna tuner in between the 2 elem yagi and the receiver. If we had it through, the band noise was at least 20dB stronger than with the AT inline and we could hear something like music and voices on day light.. that was not very clear at night...
> Interesting to mention is that music and voices couldn't completely disapear with AT130 inline on day light but almost gone at night.
> We could see 40m station signals with AT-130 inline but nothing without it.
> I found very strong signals on 3720KHz, 7440KHz and or multiples of 1240KHz.
> BTW, the 1240KHz bracasting station is about a mile from my house and I think it runs at least 3kW. And I thought I had a lot of QRN at night....
> I believe the right answer shall be a BCB filter but will a BCB and a bandpass in series do remove all interference and bring life back into HF for me?
>
> 73,
> Luciano PT9KK
>
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