[GreenKeys] Suppression - M28 printers

[Nick England]

So the solenoid is to electrically override normal SELCAL print
suppression? I can see that.

The SELCAL example in the Stunt Box booklet just works mechanically via a
selector fork moving the SUP and 0 code bars.

On Tue, Mar 8, 2022 at 6:45 PM John, W9DDD <w9ddd at tapr.org> wrote:

> Selective calling.   It also uses the zero code bar.  I can never remember
> the names of the conditions.  But basically receiving the CDC code can put
> you in print.  Zero code bar then can be positioned to blind the printer to
> any future CDCs.  Then at the end of the message you get a code that puts
> you into non-print, suppressed and back into being able to decoded CDCs.
>
> I have printers with the solenoid and without.  In all cases the little
> arm is down into the slot.  I think the solenoid to allow monitoring the
> line irregardless of stunt box codes.
>
> There's 3 or 4 docs about the stunt box that goes into all the nuances.
> With 42  slots the combinations are endless (almost, you have to use some
> of them to do things like CR, LF, and FIGS-LTRS shift)
>
>
> ---
> ----
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
>
> On 3/8/2022 5:07 PM, Nick England wrote:
>
> I recently unearthed a 28 typing unit with a solenoid on the left end for
> print suppression. Not something I had run across before.
> Having never paid any attention to the SUPP code bar, I took a look at
> some other units and found the following other variants-
> SUP code bar pulled to left by spring tension
> SUP code bar pinned to right (by small lever fitting into code bar notches)
> SUP code bar with linkage for solenoid but pinned to right (by small lever
> fitting into code bar notch)
>
> The spring unit types OK no matter if is left or right…hmmm.???
>
> So what’s the story on the suppression solenoid - what was it used for?
>
> Cheers
> Nick K4NYW
>
> --
> Nick England K4NYW
> www.navy-radio.com
>
>
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-- 
Nick England K4NYW
www.navy-radio.com
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