European (or better non Teletype) machines use a very sensitive polarized relay to detect

the current loop reversing of the TW39 system which switches the motor power relay after

an incoming call.

Hence stand-by power usage of an European Telex control unit is almost nothing.

I would install the mentioned resistors on a small distance to the PCBs.

And yes... it should be online 24/7 - that's the fun of i-Telex. :-)

73

Henning DF3OE

i-Telex 925302 

www.i-telex.net

www.telexforum.de

Am Mo., 5. Sept. 2022 um 22:54 Uhr schrieb Paul Heller <[email protected]>:

Nice machine!

A fan is an interesting idea. A small one that runs off 120vac perhaps.

I don’t have that insulator in mine and I think Wayne’s suggestion to remove it is a good one. I often leave the lid opened to let air circulate in there.

It seems like a bad design. The European machines have a relay which is much better. I don’t know how they dissipate power from the small amount of loop current when not in a call, but I’ve not noticed heat build up in them. Yes it gets pretty warm and I often worry about that but so far all is doing ok on my machine. I do power it off when going away for any extended amount of time.

Paul
W2TTY

> On Sep 5, 2022, at 4:37 PM, Andy KN4UCL <[email protected]> wrote:
>
> 
> Hey folks, I recently got my M32 up and running on i-Telex and all is good but things are getting a little toasty and I am not sure how much I need to worry.  Please see attachments - the circles I drew show where it's getting hot.  120-130F if my Harbor Freight thermometer is to be believed.
>
> As there is quite a bit of room in there, I was wondering if a small fan would be helpful. 
>
> Any thoughts appreciated!
>
> thanks
> Andy
>
>
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