[GreenKeys] Common configurations for 28ASR with auxiliary reperf

[Jim Cooper]

On 11 Sep 2021 at 20:21, Paul Heller wrote:

> All the 28 manuals and wiring diagrams I am finding donTMt say much
> about how the under dome typing reperf is connected inside the
> cabinet. But perhaps I am looking incorrectly. ITMm not sure how I
> would best split it out if I wanted to.
> 
> I appreciate any clues to further information.

I will be daring and include my reply to you also 
to the group ...   ;))

I'd say it depends on the application the M28 set is 
being used for ...  commercially, for example, it's quite 
possible traffic came in on a 100wpm channel to the 
reperf and was then sent out to a different channel using 
the ASR TD at let's say 60wpm ...  basically a 'cheap' 
M28 RT set ...  

For 'average' ham use, I would think that one would 
want the reperf in the same loop the printer is receiving 
at, and the op would just turn on the reperf if he wanted 
to save some traffic on tape ...  or maybe a stunt box code 
in the LP would activate the LPR to make tape -- but the 
LPR would have to be at the same speed as the printer, 
of course. 

Since your LPR has a speed shifter gear, you might want 
to consider setting up loops with a jack field (hey, I have 
a super big one available!!) [really, would only need a few 
jacks] ... with two separate loops ...  if you wanted to receive 
an oddball speed off the air, plug LPR into that receiving 
loop;  if you want it to work with the ASR plug it into the 
local ASR loop.   Speed changing LPR is like a Cadillac  ;)) 
Lucky to have one. 

As for not seeing it in M28 wiring diagrams, there were 
so many different ways the equipment could be used -- 
especially for Leased Circuits (like I used to work with for 
ITT WorldComm) every customer had a different wiring 
setup ...  the engineer (me) would draw up the schematic and 
wiring plans based on what the sales guys dreamed up !! 

Unless your ASR also has a speed shifter, my suggestion 
is to keep the LPR separate from the loop on the ASR 
printer/TD ... so WHEN you want to do something with a 
different speed the LPR is there to copy it. 

Jim   w2jc