[Hallicrafters] Peet Ultimeter 2100 interference

[bill riches]

A while ago I asked if anyone had a cure for rf interference that I have
every 12 khz or so from 100 khz up to about 10 mhz. I called Peet and
tech service said the racket is coming from the humidy sensor but had no
ideas for a cure.
 
I tried a bunch of ferrites in barious places in the top control box and
they did not help at all.  What did work was installing a .05 cap across
the terminals marked Humity sensor (yellow) and common (red).  That
eliminated the interference.
 
Was surprised that Peet would not say - "Gee - sorry about the
interference - we will have our engineers check it out and get back to
you".  If it was an el-cheepo unit I could understand their attitude,
however on a unit that starts at a grand you would think they would be
more interested.  I guess today all a manufacturer has to do is slap a
Part 15 sticker on their equipment and they are good to go.  
 
Parts cost - about 20 cents for the cap!!
 
Off vent mode!!
 
73
 
Bill Riches, WA2DVU
Cape May Court House, NJ 08210