[Heathkit] HR-10 IF leakage

[Robert Nickels]

Ron Youvan wrote:
>   I don't know the rig, but what is the IF frequency?  Is it near
> 1680 khz X 2 = 3360 kHz?  If so there is your problem. 

Hi Ron - and thanks for your reply.  The HR-10 IF is 1681 khz.   (Why 
they chose this freq only Heaven and the Engineers at Heath know!)

Just to update the group, both my buddy Larry WA9VRH and I were 
experiencing the same thing - bad IF feed-through from a 1680 khz AM 
broadcast station.  In my case it was enough to drive up the AVC and 
make the receiver really numb.  But only on 80 meters - the other bands 
were OK - which led me to think that it was just a lack of Q in the 
front-end.  

But then I got to thinking - both Larry and I were using trap slopers 
that cover 80, 40, and 160 meters.  Evidently our antennas were letting 
too much RF from 1680 into the front-end, because as soon as we switched 
to either a resonant antenna, or one fed thru a tuner, the interference 
disappeared.

I can't fault the Heathkit engineers for not considering that hooking 
the receiver to an antenna for a frequency it wasn't designed to cover 
might let signals from a band that didn't exist cause a problem!

73, Bob W9RAN