[AMRadio] Heath XC-6 question

[Tom Chesek]

Yes Charlie, you got those convertors and the 28MC crystals from me.  I'm 
glad that you are making use of them.

Tom K3TVC



-----Original Message----- 
From: CL in NC
Sent: Thursday, November 04, 2010 11:12 AM
To: AM radio
Subject: [AMRadio] Heath XC-6 question

Howdy all,

Checked into my first Collins Collectors net last night, wow, lots of 
carriers and checkins on the East Coast.  Even had to use the notch on the 
Mohawk to sort some out.

I picked up a Heath XC-6 and XC-2 converters to use with my Mohawk and 
Seneca TX.  I believe I got them from a fellow on this list.  If I did, the 
28MC crystals worked fine to put the 6 meter back on the 22-26 IF band of 
the Mohawk. The 2 meter worked fine the first time, but did not have the 
.3uv sensitivity the ARRL said it would have.  Gee, a 50 year old tube 
converter and doesn't meet specs, who would have known?

But, do any of you old time VHF AM folks that may have used these converters 
remember a mod to the 6 meter converter on the mixer/oscillator?  The normal 
Heath circuit has been modified in the mixer stage to change the 'L' network 
output, to a link output, and the oscillator from a simple crystal to ground 
in the grid circuit to an elaborate link coupled oscillator.  While this is 
working OK, the output stage will not come to resonance on 22MC, the slug 
wants to come all the way out of the coil, and is still climbing in output 
when you reach its' limit.  There is no parallel cap on this coil, just uses 
the internal capacitity of the 12AT7 to bring it to resonance.

The QST online archive has nothing on mods to these units, and I have no way 
of determining if the output coil has been changed.  Both osc and mixer 
coils just have 3 turn links wound on top of what may or may not be the 
original Heath coils.

Thanks for any help.

Charlie, W4MEC in NC



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