Topband: Any Linrad selective limiter noise blanker experts here?

[Roger D Johnson]

Darn! Forgot the URL!
http://www.ka7oei.com/syn_blank.html

73, Roger



On 1/20/2020 10:43 AM, Tim Shoppa wrote:
> My horrible utility line noise (which afflicted me in ARRL 160) continues
> and I'm looking to operate in the CQ 160 test this weekend and not be an
> alligator. I've located the offending pole but lack any way of getting it
> fixed on such short notice.
> 
> In a quiet non-contest topband session, my rig's noise blanker does a very
> decent job eliminating the 120Hz impulses. I have to operate many kc away
> from any loud locals but it's effective. In a low-power contest like NAQP
> SSB the rigs noise blanker is still useful although not a cure-all.
> 
> But in a 160 contest with a huge density of loud local signals, the rigs
> noise blanker's action just mixes all the super-loud dense signals together
> and isn't really effective anymore.
> 
> I read in N2NC's NCJ article, about the powerful technique of using a SDR
> with Linrad configured to not apply the noise blanker to the loud signals.
> He goes on to say "The Linrad noise blanker, combined with the 768kHz
> bandwidth of the Airspy HF+, has been a big plus when the noise pops up. It
> makes the noise a non-issue, and I notice no distortion, even on a band
> packed with strong signals". N2NC's article here:
> https://ncjweb.com/bonus-content/N2NC-Linrad/N2NC-Linrad-Main.pdf
> 
> Can any topbanders familiar with Linrad, please give me some hints on this
> configuration? Either on this list or by E-mail to me.
> 
> Tim N3QE tshoppa at gmail.com
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