[GreenKeys] GreenKeys Digest, Vol 107, Issue 14

[John Nagle]

On 12/8/2012 1:09 PM, greenkeys-request at mailman.qth.net wrote:
> Message: 4
> Date: Sat, 8 Dec 2012 20:56:31 -0000
> From: "Rob Jarratt" <robert.jarratt at ntlworld.com>
> To: <r.jarratt at computer.org>,	<greenkeys at mailman.qth.net>
> Subject: Re: [GreenKeys] Powering an ASR 33 Teletype in the UK
> Message-ID: <000301cdd586$818edd50$84ac97f0$@ntlworld.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> I just noticed something else which is puzzling me a bit. On the ASR 33's
> plate it says:
> 
>  
> 
> Supply Input: 115V 50Hz AC 5Amp Max
> 
> Signal Input: 120V.D.C MAX 0.07Amp Max
> 
>  
> 
> What is the difference between supply input and signal input? I am assuming
> it needs me to provide a 115V 50Hz supply but I am not completely sure now.

    The data signal input is a 60mA current loop.  The data plate says
the upper safe limits are 120VDC and 70mA.

					John Nagle