[TMC] Anyone working with the TMC GPR-110 Receiver?

[John Vendely]

Howdy,

Partly in the interest of waking up the list, I thought I'd ask if there 
are any folks out there who have or have had a GPR-110 receiver?  TMC's 
last HF receiver, the GPR-110 was not a successful product and few were 
sold.  TMC actually bought some of them back from dissatisfied 
customers, so I wonder how many might still be in existence.  So far, I 
know of only one other.  I've been restoring a GPR-110C over the last 
couple of months and am nearing completion.  It's an interesting and 
somewhat unorthodox receiver which went through several substantial 
design changes (a few of them undocumented) over about an eight year 
period before TMC exited the HF receiver market around 1980.

Same with the 1985-vintage MMX-4, TMC's last sideband exciter. The MMX-4 
replaced the MMX-2 series as the exciter in late-model HFT-10K 
transmitters, and was also sold as a retrofit exciter for older TMC 
transmitters.  Unfortunately, like the GPR-110, relatively few were 
sold.   I overhauled an MMX-4 a while back--the only one I've ever 
seen--and like the GPR-110, it's an interesting design though not up to 
the performance standards of contemporaneous exciters.  Any others out 
there?

These were economically difficult times for TMC, and incurring the 
expense of developing complex receiver and exciter designs like 
these was audacious and heroic...

73,

John K9WT