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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