David,
to start a discussion, noise blankers, in general, work best on a
wideband noise signal, with well-conditioned group delay characteristics
where the blanking occurs. Multi-pole analogue filters, by their nature,
have poor group delay responses, which is why group delay is usually not
mentioned on the spec. sheet. A digital FIR filter is far better in this
respect. So your 756 PRO has everything going for it: wide bandwidth and
digital FIR filters.
A digital domain noise blanker can, in principle, be configured to
minimise the effect (spectral line widening) of the blanking operation
on the signal of interest, but it would probably be a significant effort
to design and implement.
Robin, G8DQX
On 17/12/16 01:37, David Tiller wrote:
All,
I'm currently suffering thru S9 arc noise at my QTH on 30m - 6m, but I
figured I'd try to decode some MSK144 this evening - it should be able
to cut thru the noise, right?
I forgot I had the noise blanker on (Icom 756 PRO), and I got decodes
left and right. When I turn it off, though, I get no decodes at all. I
figured if an old, tired DSP rig like the 750 PRO could do some DSP
voodoo to zap the noise, WSJT-X could add it as either a standard
filter or as an option.
What do you guys think?
I can provide WAV files of the noisy and noise-blanked signals.
--
*David Tiller*
Sr. Architect/Lead Consultant | CapTech
(804) 304-0638 | [email protected]
<mailto:[email protected]>
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