[GreenKeys] M28 ASR Print Issue

Mon Jun 3 07:25:24 EDT 2024

Here’s the issue with reversals (dot cycle)

0 start
10101 Y
0 but I need 1 to stop
        so maybe I keep going
1 is this the first bit of a new character?
        or is this the stop bit I’ve been waiting for?
        or do I just keep going?
0 is this a start bit for Y 10101 ??
         or is it the first bit of R 01010 ??

I am so confused!

Nick England K4NYW
www.navy-radio.com

On Mon, Jun 3, 2024 at 6:14 AM Nick England <navy.radio at gmail.com> wrote:

> 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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>>
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