[GreenKeys] M28 LPR reperf

[Duncan Brown]

John,

On 12-Apr-21 15:54, John, W9DDD wrote:
> I'm not much of a Klein guy.  I touched one in the Army, but I don't 
> remember having to empty a chad box.  Maybe I'm wrong, cause I think 
> it printed between feed holes.  I don't think I ever used the GRC-46 
> to send a message by teleprinter, but I did kill some time typing a 
> fox tape and rys, to keep up my typing skills.
The TT-76 in the GRC-46 made lots of chad! It used wider (7/8") tape and 
printed on the wider edge. (Some later KLI reperfs could take both sizes 
of tape and then typed over the feed holes on the narrower tape.)

>
> Anyhow, there was a tape lid change for the 14 TD was a newer style 
> for chadless tape. It had slots or channels on the bottom side of the 
> lid rather than just a hole for the pins to poke through.  I suspect 
> part of the problem was space for the lid to flip up when the pin was 
> trying to get through a hole. The slots allowed that and also 
> prevented the chad lids from being pressed down as they entered the TD.
>
That makes sense. The tape lid would need to have room for the chad lids 
to move up so the pins could read the hole.

> My LPE doesn't punch a hole for the feed, the sprocket that pushed the 
> tape into the punch block does it, although it's not really a hole, 
> but a crater?  I suspect the LPR is the same.  That means there's an 
> adjustment to get the feed and data holes lined up.

That is what the feed holes in this LPR looks like: "craters"


What was your MOS? operator or repairman?
I was a 31J - TTY repairman.  But I had been a ham for 8 years before 
going into the service, and found I knew as much about radios as the 
Army-trained radio repairmen. So I worked on radios in my spare time and 
got my MOS changed to radio repair.

Thanks,

Duncan
K2OEQ


>
>
> On 4/12/2021 12:30 PM, Duncan Brown wrote:
>> I've been checking out a M28 LPR, chadless tape, reperf.  I'm mainly 
>> a Kleinschmidt & M15 guy and don't have much experience with M28s 
>> (they just seem to run & I don't have to do anything with them). So 
>> some questions on the LPR:
>>
>> 1. Does the LPR punch the feed holes? or do the feed pins just pierce 
>> the tape?  (the feed holes look small and pierced rather than punched.)
>>
>> 2. The print was light, so I put in a new ribbon, but it didn't make 
>> much difference.  I remember seeing some comments about 
>> problems/solutions to a print hammer problem.  What is the problem 
>> and is there a solution?
>>
>> 3.  Were different tape readers required for chad and chadless tape? 
>> Tried running a tape from the LPR on a TT-76 (it is designed for both 
>> sizes of tape) , but there were lots of errors.  I can understand 
>> that with fully-punched tape, you would want to sense the tape in the 
>> middle of the hole. But with chadless tape you might want to sense 
>> near the edge of the hole, away from the chad hinge?
>>
>> Thanks,
>>
>> Duncan
>> K2OEQ
>>
>>
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