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Date: Mon, 12 Feb 2018 16:35:59 +0000
From: Chris Wilson <dead.fets@gmail.com>
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To: rsgb_lf_group@blacksheep.org
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Content preview: Hello Mike, Thanks for the reply, it actually has 2 (in series)
N1BUG band pass filters in front of it! I have always had this "noise hump"
around the band, I once thought the filter (one...) had cured it, but next
time I looked it was back. MF is lovely and quiet in comparison. i see exactly
the same with a Softrock with or without a BPF. [...]
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Subject: Re: LF: Do I need an attenuator on LF RX??
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Hello Mike,
Thanks for the reply, it actually has 2 (in series) N1BUG band pass
filters in front of it! I have always had this "noise hump" around the
band, I once thought the filter (one...) had cured it, but next time I
looked it was back. MF is lovely and quiet in comparison. i see
exactly the same with a Softrock with or without a BPF.
http://blog.n1bug.com/2017/02/01/2200-meter-softrock-lite-ii/
Monday, February 12, 2018, 4:26:13 PM, you wrote:
> Chris,
> It looks like you have a broadcast station where it shouldn't be (at
> 132.65kHz) and several other spurious stations in that area, so you
> may well have unwanted signals within the 136kHz band, especially at
> night (your recording seems to have been done during the middle of
> the day). You might improve things by by-passing the pre-amp. It
> would do no harm just by experimenting with an attenuator but why
> attenuate and amplify at the same time unless the preamp also
> provides another function such as matching? It seems the only
> front-end selectivity on that receiver is a narrow bandpass so you
> would really benefit from some additional wider filtering, eg an LPF
> with a cut-off just below the LW BC band.
> Mike, G3XDV
> ==========
--
Best regards,
Chris mailto:dead.fets@gmail.com