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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>>>http://lists.contesting.com/mailman/listinfo/orion
>>
>>
>>
>>
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>>
>
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