Re: [TenTec] [Orion] Orion II Noise Blankers

["Ron Castro" <ronc@sonic.net>]

Great test, Lin!  This confirms my more subjective observation that both the 
HW and SW NB's work extremely will on short-duration peak noise.  Probably 
the stronger and shorter the peak, the better it works.  Greater pulse-width 
duration noise, such as that from arcing power line insulators is another 
story...
Ron N6AHA

----- Original Message ----- 
From: "Lin Davis" <linbdavis@earthlink.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, February 25, 2006 2:34 PM
Subject: Re: [TenTec] [Orion] Orion II Noise Blankers


> After reading some some of the comments about the O2 noise blankers, I did 
> this
> test:
>
> O2 settings:
> AGC: slow (Hang: 2.02 sec, Decay: 5dB/s, Threshold: 0.37uV)
> F= 21.3MHz, USB, BW=2100hz, PreAmp OFF, Atten: none.
> Antenna: 10 foot piece of wire in ANT2 and within three feet of noise 
> source.
> I used a soldering iron for the noise source by switching it on and off 
> about 30
> times for each of the settings below and recorded the highest S-meter 
> value
> observed. (Probably not too good for the iron ;) )
>
> Results:
>
>    NB       S-METER    Equiv. Input  Total
> HW   SW                Power (dBm)   Reduction (dB)
>
> OFF  OFF    S9+55          -31       0
> OFF  1      S9+30          -52       21
> OFF  5      S9+20          -59       28
> OFF  9      S9+20          -59       28
> ON   OFF    S1.5           -94       63
> ON   1      No Movement    LT -101   GT 70
> ON   5      No Movement    LT -101   GT 70
> ON   9      No Movement    LT -101   GT 70
>
> Where:
> LT = Less Than
> GT = Greater Than
>
> The Equivalent Input Power values came from my S-meter calibration I did a 
> while
> back with a precise RF generator (Agilent aka HP)
>
> Conclusion:
> For this type of noise, the hardware blanker is very effective! The DSP 
> blanker
> is less effective, but does reduce it signifigantly. Remember, a reduction 
> of
> 70dB means the equivalent power was reduced by a factor of 10,000,000.
>
> I hope you found this informative....
>
> 73,
> Lin
> WB1AIW
>
>
> Ronald Gorski wrote:
> > At 03:55 PM 2/24/06 -0500, BobK8IA@aol.com wrote:
> >
> >
> > > Both the hardware and software noise blankers in the Orion II dont  seem 
> > > to
> > > be doing much, if anything. The digital NR certainly operates as I can 
> > > hear
> > > that one kick in.
> > >
> > > I did a master reset and no difference.
> > >
> > > Anyone else notice my problem?
> > >
> > > 73, Bob  K8IA
> > >
> > > _
> > For me, the hardware NB works somewhat but the s/w NB does nothing. As I
> > mentioned in a previous thread, the NR produces audio distortion.
> > Ron N9AU
> >
> >
> >
> >
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