I have never seen this noise reducer before, interesting that it does not use a
sense antenna. I have operated from the Caribbean when there was a noise
source in the US direction and it is extremely frustrating. Of course the
noise is always in the worst possible direction. The following KP4AA video
shows the NR-1 in action and it is impressive.
https://youtu.be/i3tDPcf-ZjE?si=l0ETs-AH2FmTzGfn
John KK9A
JP W2XX wrote:
We use one at KP4AA due to some hellacious line noise that was plaguing us
beaming stateside. It does what it says on the box. It’s a little fiddly though
and the knobs aren’t very big, the whole box is tiny actually.
It’s not set and forget, required tuning for each band or each different noise
source.
Of course the day after cqww SSB, the noise source was fixed 🤣
You could reach out to Ken, KP4AA, for all the details. His email is good in
QRZ.
J.P. W2XX
> On Nov 11, 2025, at 7:30 AM, Jim VE7RF wrote:
>
> Has anybody used this unit ? It's unique in that it does not require a
> separate noise sense ant.
> It's made by SV3ORA.
>
> It can also be installed in the RX only loop, commonly used in most
> xcvr's. Then it can be used safely, and also used with QSK.
>
> It has a separate bandswitch...'marked 'IMD'. The unit covers 1.6 to
> over 70- mhz......and everything in between. It can also be modified for
> use on the 2 x lower freq bands.
>
> http://www.qrp.gr/nr1/sv3ora_NR-1_Antenna_Noise_Blanker_manual_EN.pdf
>
> http://qrp.gr/nr1/
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