[GreenKeys] New Teletype Model 28 ASR

[William Wuttke]

Hi Paul,

I’m currently using a Model 33 ASR with a HAL ST-8000 which doesn’t have a current loop interface. I made a homebrew 20 ma loop to RS-232 converter using HCPL-4100 and HCPL-4200 optoisolators. I don’t have anything that interfaces with a 60 ma loop. The quickest and easiest thing for me to do is convert the 28 to 20 ma.

73,
Bill
KE3BK

> On Jul 27, 2019, at 8:07 PM, Paul Heller <paul0926 at comcast.net> wrote:
> 
> Glad to hear it  I’m curious why you want to run at 20ma.
> 
> Paul 
> W2TTY
>