[GreenKeys] suggestion for ST6 Modification.

Tue Mar 4 16:14:31 EST 2014

Lee, it seems that the auto space circuit kicks in once the data stops. So the st6 will go into mark hold. So the machine is not running open while you wait for the motor to turn off. But once it does turn off, as it is spinning down, it runs open for a handful of revolutions - having had the loop open when the motor relay is relaxed.

Eugene

73 Eugene W2HX

-----Original Message-----
From: Lee Mushel [herbert3 at centurytel.net]
Received: Tuesday, 04 Mar 2014, 9:48am
To: W2HX [w2hx at w2hx.com]; greenkeys at mailman.qth.net [greenkeys at mailman.qth.net]
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

Gentlemen,

I find some of the comments in this thread to be confusing.   Since, by design, there is an adjustable delay of  25 to 40 seconds after the "loss of signal" until the motor shuts down I would think that this "long time" of open running of the machine would have driven operators absolutely crazy in 1973.   So I have to wonder whether or not the critical (and admittedly lengthy) Auto-Start tune up procedure has been followed by people with this problem.

The overall tuneup procedure for the ST-6 is extensive and if you do not have access to it I fail to see how the TU can be operated!  There is more to this than just a "relay."

73

Lee   K9WRU

----- Original Message -----
From: W2HX<mailto:w2hx at w2hx.com>
To: greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>
Sent: Monday, March 03, 2014 5:50 PM
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

My mistake. You are all correct. Loop does open when the motor stops. But as several have suggested, it would be nice to hold the loop for a few seconds while the motor spins down.

Thanks everyone and sorry about the error
Eugene

From: greenkeys-bounces at mailman.qth.net<mailto:greenkeys-bounces at mailman.qth.net> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jack Hart
Sent: Monday, March 03, 2014 5:49 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

In the ST-6, the autostart motor relay also opens the loop.
I've seen a lot of ST-6's with that feature "jumpered out"....

Jack K0TTY

From: greenkeys-bounces at mailman.qth.net<mailto:greenkeys-bounces at mailman.qth.net> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Herb Graeber
Sent: Monday, March 3, 2014 4:32 PM
To: greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

If I remember correctly, both the motor and the loop
current are cutoff at the same time.  I remember the
machine running open for the few seconds while the
Model 28 ran down.  But, I've slept since then.
73...Herb K5HG

----- Original Message -----
From: Alf Fisher<mailto:alf_fisher at tiscali.co.uk>
To: k0bx at arrl.net<mailto:k0bx at arrl.net> ; W2HX<mailto:w2hx at w2hx.com> ; greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>
Sent: Monday, March 03, 2014 4:04 PM
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

Hi Joe & Eugene,
I reckon it would be desirable after the auto-start relay times out, to have a few seconds delay before opening the loop otherwise the machine will run open while the motor slows down.

The ST-6 does cut off the loop current and motor already but I don't know whether there is any delay on the loop current being cut.

73
Alf
G3WSD

----- Original Message -----
From: k0bx at arrl.net<mailto:k0bx at arrl.net>
To: W2HX<mailto:w2hx at w2hx.com> ; greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>
Sent: Monday, March 03, 2014 8:34 PM
Subject: Re: [GreenKeys] suggestion for ST6 Modification.

I believe the HAL ST-6 does this already.  When the auto-start relay times out, it also disconnects the loop supply.

Joe K0BX

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________________________________
From: W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>>
To: "greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>" <greenkeys at mailman.qth.net<mailto:greenkeys at mailman.qth.net>>
Sent: Monday, March 3, 2014 5:39 PM
Subject: [GreenKeys] suggestion for ST6 Modification.

Hello all,

I’ve been bitten with the autostart bug. As I refamiliarize myself with the ST6 (having not played with it much in a few years).  I realized that even after it turns the motor outlet off, the loop current remains flowing. I thought it would be a good mod to have the loop open up when the motor turns off to safe heat, magnets, etc.  I thought one solution might be to change the motor relay to one that has another pole. Then run the loop through that pole. So when the relay opens, so does the loop.

But I wonder if there would be a more elegant solution that would be purely electronic and not have to change the relay.  Or perhaps there really is not benefit in turning off the loop.

73 Eugene W2HX

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