[Kenwood] Magicom Board for TS-820 What?

[N4ch at aol.com]

Well, it took a few months, but I FINALLY found the folder  with the 
paperwork for the two Magicom/W6TOG modification kits (I bought  both long ago) 
for the Kenwood TS-820........one was to add improved speech  processing to 
the transmitter, and the other supposedly improved receiver  front-end 
performance.   I have original promo sheets AND installation  instructions for 
both.   There's not much there (no schematics), but  what I do have is all there 
ever was, I'm pretty sure.   Anyone still  interested ?
 
73, Herman, N4CH.
 
 
 
In a message dated 9/27/2012 7:22:52 P.M. Eastern Daylight Time,  
N4ch at aol.com writes:

Hello  Les (and others).......

Shortly after the TS-820 came out, Magicom  offered at least  TWO "kits" to 
upgrade the performance of these  rigs.   One was to  improve TX speech 
processing; the other  supposedly improved receiver performance  (I THINK 
it was 
in regard  to sensitivity/overload performance, but not all that  sure).    
About 35 years ago, I bought one of each to install in my  then  almost-new 
TS-820.   The TX circuitry was mostly on a small  board  that was tacked 
in, and 
I THINK it had an IC that Magicom had  removed the  markings from, and of 
course the docs didn't say what  the part was.    This sounds like the mod 
you 
may  have.   The RX mod was minimal in  parts count.........I think  it 
consisted of a dual-gate mosfet or two to sub  into the receiver's  front 
end.   
There may have been another part or  two  changed also, but it's been a 
long 
time.   It's possible your  '820  has this mod too, but U will have to 
check the 
2 transistors in  the front end  and see if they have been changed.   As I  
recall, the transistors  supplied with this mod kit had the markings  
removed 
too.   If  your 820 has 2 unmarked devices in the  front end, there's a 
good 
chance it had  the receive mod kit added  too.    I remember, after making 
the mods,  there was  minimal improvement in performance both ways (at 
least it 
seemed  that  way), but I didn't have much sophisticated test gear back in  
those days, and  never made any "before/after"  measurements.   Although my 
 
so-modified rig is probably  long gone, I MAY still have a copy of the 
Magicom 
paperwork, but it will  be sometime next week before I'll get a chance to 
look  for  it.   More later........have a busy few days ahead.

73,  Herman, N4CH.



In a message dated 9/27/2012 1:24:56 P.M. Eastern  Daylight Time,  
wb6orz at pacbell.net writes:

Help please: we  have a TS-820 here with this board added to the IF  board. 
A Google  search has yielded some info, but still need the original   
instructions that came with this and/or any further info list members  can  
offer 
here.
How does this thing work? How is it switched on  or  off? What does the 
schematic look like? Does it change the method  of adjusting  the 
processor? Is 
it a compressor or a clipper? What  we've read sounds  favorable, but I'm 
bewildered.
Thanks in  advance!
(((73)))
Les
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