[GreenKeys] M28 ASR Print Issue

Mon Jun 3 06:14:43 EDT 2024

Yes to the range adjustment.

Note that “dot cycle” or “reversals” is NOT the same as RYRY.
Reversals 01010101010101
RYRY. 0101011/0010101/
(/just to show characters)

Depending on the machine it might print RYRY for reversals or might not. I
suspect 7 vs 7.42 speed makes a difference but haven’t bothered to verify
that.

Anyway set the range control with real RY characters, not reversals.

Reversals are great for adjusting polar relays and transmission circuits,
not printers.

Nick England K4NYW
www.navy-radio.com

On Sun, Jun 2, 2024 at 10:13 PM Duncan Brown <duncanancy at earthlink.net>
wrote:

> Eugene,
>
> With the "Dot cycle" signal, you are generating a short stop pulse
> (22ms).
>
> Check the motor speed and the Range control.  You can probably get it to
> print correctly with a Range adjustment.  If the Range setting is much
> different than the other unit, it indicates another problem.
>
> Good luck,
>
> Duncan
> K2OEQ
>
>
>
> On 6/2/2024 10:04 PM, W2HX wrote:
>
> Thanks Jeff. They both used to work 100% in sync a few years ago. This is
> something that has changed in the last few years.
>
> One thing I’ll do is put the character generator on a scope (in series
> with a voltage source) to see what exactly is the difference between
> setting two characters of R and Y vs. dot cycle.
>
>
>
> As you suggested, I just tried the dot cycle on the ASR only (removing the
> KSR) and still had the same result RYYRYY.
>
> I should also mention that, the rhythm of the machine sounds “off” almost
> like it is running faster than 45 baud. Not much faster, but just sounds
> off. It used to be when I ran both machines together, they audibly would be
> perfect. Now the ASR sounds like it is running a little faster. That is the
> only thing I can think of to describe the sound.
>
>
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
> *From:* Jeffrey Golas <jeffg at junknet.net> <jeffg at junknet.net>
> *Sent:* Sunday, June 2, 2024 9:56 PM
> *To:* W2HX <w2hx at w2hx.com> <w2hx at w2hx.com>
> *Cc:* Greenkeys <greenkeys at mailman.qth.net> <greenkeys at mailman.qth.net>
> *Subject:* Re: [GreenKeys] M28 ASR Print Issue
>
>
>
> Id compare selector magnet resistance/inductance, the repeating letters
> aImost seem like a signal issue than mechanical. Id also try an RY paper
> tape by itself (or try your tester on just that machine).
>
>
>
> I wonder if one is intended for a different current rating or has any
> resistors on the loop that are aging or just too large.
>
>
>
> Jeff
>
>
>
> On Jun 2, 2024, at 9:37 PM, W2HX <w2hx at w2hx.com> wrote:
>
> 
>
> Hi all,
>
>
>
> For the last several years, I’ve noticed that my ASR does not print
> traffic the same as my KSR both are on the same loop. I would say the
> accuracy of the print is much worse than the KSR. But since I had the KSR
> working well, I never had the impetus to look into in detail. Tonight, I
> did a simple test and saw some interesting results.
>
>
>
> First, I am using a character generator which seems to work well (see
> attached picture).  The character generator has several modes, QBF
> (sentence) is one mode, then you can set up two individual characters and
> send an alternating series of these characters. It also has a “dot cycle”
> mode, which I believe is simply alternating mark and space.
>
>
>
> When I set up R and Y and send them out, both printers work perfectly.
> However, when I use the DOT CYCLE mode, the KSR again works FB, but the ASR
> shows RYYRYYRYY. Below are links to the print copy. Note there are two
> “paragraphs” on the page. The top paragraph is using the individual R and Y
> characters set up using toggle switches. The second paragraph shows the
> results of the DOT CYCLE mode. Again, these are on the same current loop.
>
>
>
> KSR page:
> https://w2hx.com/x/What-Is-It/ASR-Printing-Issue/20240602_191335.jpg
>
> ASR page:
> https://w2hx.com/x/What-Is-It/ASR-Printing-Issue/20240602_191352.jpg
>
>
>
> Anyone have any suggestions where to look?
>
> Thanks
>
>
>
> 73 Eugene W2HX
> My Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
>
>
> <20240602_191208.jpg>
>
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