[RFI] MFJ-856 oddity

Cortland Richmond ka5s at earthlink.net
Wed Aug 15 13:13:50 PDT 2012


That has to be SOME noise!

Assuming no saturation, how about a sensitivity adjustment/step for the 
meter?

Cortland
KA5S

On 8/15/2012 0951, N1BUG wrote:
> Charlie,
>
> My total attenuation (series connected) is 50 dB. There are places
> even that is not enough - where the meter will sit pegged throughout
> a ~400 foot area. These are *not* areas where the attenuator anomaly
> is happening, but places where the attenuators are working yet 50 dB
> is just not enough.
>
> Note that I seem to have some rather strong noise sources. One I can
> hear from one mile away with the 856 pointed toward the offending
> pole, trees in the path but *no power lines, poles or man made
> structures of any kind* between the 856 and noise source. Perhaps
> this is not unusual, but this level of intensity surprised me. The
> particular source, later narrowed down by an ultrasonic device,
> seems to be either a cutout or pin insulator on a ~13kV line.
>
> 73,
> Paul
>
>



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