[GreenKeys] Can anyone identify this machine

[Martin]

I was wondering about that.

Its 160 volts.

Martin

On 02/03/2018 15:36, Ralph Mowery wrote:

> Without knowing the exact voltage the st5000 puts out it is hard to calculate the exact value, but if you put a resistor of around 7000 ohms and probably around 5 or 10 watts  in series with the loop you would have your 20 ma current loop.
>
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Martin
> Sent: Friday, March 02, 2018 9:59 AM
> To: Greenkeys email list
> Subject: Re: [GreenKeys] Can anyone identify this machine
>
> Eric
>
> Unfortunately I dont.
>
> I normally use an ST5 .
>
> What sort of loop does it produce? Here its generally 20 Ma using 80 volts, I believe you are on 60 ma. I have no idea as yet what the No 2A needs, it could be it came with standard American coils or maybe one of the GPO mods was for 20 ma.
>
> I am currently looking at a HAL ST5000 which I have pulled out of my pile of demodulators which appears to do both high and low tones, but unfortunately produces a 60 ma loop. I am hoping to get around that by using the FSK output which is alleged to be RS232 levels, to drive the similar input to my ST5. But for some reason the FSK out doesnt seem to be working, I need to get it onto the bench. If I could get this to work it would mean I can copy the ITTY and AUTOSTART broadcasts too.
>
> I suppose with suitable software I could also do it using your converter?
>
> But I do quite like doing it the "old fashioned way" as far as possible!
>
> Martin
>
>

-- 
--
CNET Honeybottom 5290
http://www.ckts.info/192/uk
  
This Email personally scripted by: Martin (G8UDJ)
The Strowger aficionado's site is at http://www.aeolian-hall.myzen.co.uk