[TowerTalk] NR-1 noise reduction unit.

[john at kk9a.com]

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/