Re: [RFI] MFJ 5008 ultrasonic receiver

[HankP <pfizenmayer@q.com>]

Bob -- I built the ULAD that was in QST some years ago and bought a parabolic 
reflector from Edmunds --I can hear birds - crickets my steps walking down the 
alley - two finger rubbed together at 200 feet - the wind blowing if any wind - 
in all the time I have had it I have been able to identify 1 piece of hardware 
on a pole . BTW I fiddled with a couple other 40KHZ rx approaches - but 
essentially same results. 

The APS RFI guys have the RADAR ENGINEERING ultrasonic receivers and they are 
very marginally better than my homebrew. 

They have a receiver now that is very effective - They can record the waveform 
of the noise you hear - (they prefer to record from your antenna ) then go in 
search of that matching waveform. If I was going to spend any serious dollars 
on finding powerline arcing - I would do someting that duplicates that ability 
. 

I have tuned loops - and an ICOM R10 rx which is pretty effective but nowhere 
near as good as the APS receiver . Have you looked at W0IVJ's VDSL recording 
with a SDR -- that plus some way to record the waveform would be great . 

73 Hank K7HP 



----- Original Message -----


June QST has a review of the MFJ 5008 ultrasonic receiver. I am 
thinking about getting one for locating sources of power line noise. 
What do you think of this unit ? 

Bob 
K6UJ 
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