[GreenKeys] Distortion Test Set

[WA3FRP]

The DMS-3 is great but also look for the Digitech 2650.  This is what my Field techs carried and the T&R techs  in the Telex exchange used as well.



Sent from my iPhone

> On Apr 20, 2018, at 3:43 PM, Jack <wa2hwj at att.net> wrote:
> 
> ZCZC
>  
> I found this listing on Ebay for an Atlantic Research DMS-3 Distortion Test Set.
>  
> 112871808875
>  
> These are used to test bias and distortion on Teletype circuits.  It was the tool of choice
> of TTY repairmen “in the day”.   The meter uses a 22.5VDC battery which is not readily
> available in the exact form factor needed for the meter. But there are other 22.5VDC batteries
> that would fit inside. I’ve use two 9VDC batteries in series and it seems to work OK.
>  
> This set is useful for adjusting the contacts on Model 28 “signal generators” (keyboards and TD’s) and
> testing distortion from 14 TD’s, 15 keyboards, and so on.  CAUTION…the old saying “…if it works
> don’t fix it”, applies here in regards to “testing” TTY’s!
>  
> 73,
> Jack K2TTY
>  
> NNNN
>  
>  
>  
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