[GreenKeys] M28 LPR reperf

[John, W9DDD]

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.

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.

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.

I'm trying to recall if I ever actually read in any adjustment manual 
about offsetting the feed slightly to get the pin pushing up the 
trailing edge of the chad, but it seems common sense.  There is some 
pretty heavy duty spring tension pushing the pins up on the reader.

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

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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