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Author Topic: NB and NR Performance Comparisons?  (Read 26981 times)
NO2A
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Posts: 879




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« Reply #15 on: October 09, 2012, 09:40:22 AM »

I usually leave the preamp on to hear the weak ones. I`ll try using some attenuation when that happens.
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W4OP
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Posts: 520


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« Reply #16 on: October 09, 2012, 11:37:07 AM »

You should never need a preamp below 20M unless something is wrong with the rig or you are using a very low gain RX only antenna.
Using the preamp on the low bands degrades your IP3 and blocking dynamic range.
Here's a short article on using preamps and attenuators on HF. VHF/UHF is a different story.
http://www.arraysolutions.com/Products/appnote_preamps.htm
YMMV,

Dale W4OP
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ND6P
Member

Posts: 124




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« Reply #17 on: October 10, 2012, 09:28:03 PM »

I went from a 756 Pro3 to the TS-590S and noticed too that the NR was not as good on the latter. 

It would be great if the ARRL Product Reviews would include NB and NR performance measurements.
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LA9XSA
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Posts: 376




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« Reply #18 on: October 15, 2012, 01:26:21 AM »

The NB on my FT-817ND does make the wideband electric fence pulses more bearable, but it doesn't cancel it completely. The pulses are like clockwork, so I guess that helps the NB, but they're S9 so perhaps more than the ignition noise that the NB was meant to deal with.
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N7RST
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Posts: 518




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« Reply #19 on: October 13, 2014, 06:48:35 PM »

I can honestly say, the FT-920 NB is one of the best I have ever used.  The Orion 1's is useless, the PRO2/3 are useless, the 570 doesn't seem it is even hooked up, the 590 is almost as bad as the 570.  I depend on the NB to remove static and other such noise sometimes and the FT-920 does it every time, the others do little to nothing.  NR functions, I rarely would employ.  More like a bad cell phone call.

I think some designers need to really understand NR and NB more before putting out more new radios with useless attributes like NB and NR unless they can prove they really work.....
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KG0MN
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Posts: 51


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« Reply #20 on: May 07, 2015, 08:14:40 PM »

The funny part is I have a TS-2000, TS-590, FT-950, Drake C-Line and Drake TR-4 and the TR-4 is the only one that works like it should.  But the old 23 Channel CB I had laying around does the best job clearing out the noise.
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KF7CG
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Posts: 927




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« Reply #21 on: May 08, 2015, 10:59:40 AM »

On my FT-950 the NB is not to great with the local noise. With careful parameter selection (1-15) and some volume adjustment the digital NR can pull them out of the noise, but then usually the can't hear me anyway.

FTdx-3000D, better but not great NB, and somewhat better NR. Then again usually it is useless as I won't be heard on the other end.

KF7CG
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W6GX
Member

Posts: 3768




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« Reply #22 on: May 09, 2015, 07:37:24 AM »

I have the Yaesu 5000 and the NR and NB are excellent.  In fact, I leave NR on all the time. The NR is a step ahead of the Icom Pro III which I thought it was the best NR until the Yaesu 5000 came along.  The NB on the 5000 kills power line noise and static pops.  I'm not sure if Yaesu used the same DSP code on the 3000 or 1200.  I know the NR is pretty much useless on the 950.

73,
Jonathan W6GX
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