[GreenKeys] M28 ASR Print Issue

Sun Jun 2 22:13:36 EDT 2024

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 
> <https://www.youtube.com/@w2hx/videos>
>
> *From:*Jeffrey Golas <jeffg at junknet.net>
> *Sent:* Sunday, June 2, 2024 9:56 PM
> *To:* W2HX <w2hx at w2hx.com>
> *Cc:* Greenkeys <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
>     <https://www.youtube.com/@w2hx/videos>
>
>     <20240602_191208.jpg>
>
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