Problem with a AEA Keyer
 

I have a Moresmatic MM-1 keyer made by Advanced Electronis Applications.
First, are they still around, if not, did someone assimulate them?

Now the problem. After the keyer has been on for 1/2 to 1 hour, it will only
send A's from both sides of the paddles.
It appears to be a thermal problem because if it is turned off for a while,
it works fine till it "heats" up again.

Suggestions?

Kirk Mohror
K7EKM


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On Fri, 24 Oct 2003 14:00:24 -0700, "Kirk Mohror"
wrote:

I have a Moresmatic MM-1 keyer made by Advanced Electronis Applications.
First, are they still around, if not, did someone assimulate them?

Now the problem. After the keyer has been on for 1/2 to 1 hour, it will only
send A's from both sides of the paddles.
It appears to be a thermal problem because if it is turned off for a while,
it works fine till it "heats" up again.

Suggestions?

Kirk Mohror
K7EKM


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.524 / Virus Database: 321 - Release Date: 10/6/2003

AEA is out of business. Timewave Technology purchased the data
controller products. Tempo purchased the antenna analyzer products.
Most of AEA other products died when they went out of business a few
years ago. Seems to me about 1998. It would not hurt to check with
Timewave at www.timewave.com to see if they are or know of someone who
repairs the AEA keyer line.


Gary K8IZ
Washington State Resident
Registered Linux User # 312991

On Fri, 24 Oct 2003 14:00:24 -0700, "Kirk Mohror"
wrote:

I have a Moresmatic MM-1 keyer made by Advanced Electronis Applications.
First, are they still around, if not, did someone assimulate them?

Now the problem. After the keyer has been on for 1/2 to 1 hour, it will only
send A's from both sides of the paddles.
It appears to be a thermal problem because if it is turned off for a while,
it works fine till it "heats" up again.

Suggestions?

Kirk Mohror
K7EKM


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.524 / Virus Database: 321 - Release Date: 10/6/2003

AEA is out of business. Timewave Technology purchased the data
controller products. Tempo purchased the antenna analyzer products.
Most of AEA other products died when they went out of business a few
years ago. Seems to me about 1998. It would not hurt to check with
Timewave at www.timewave.com to see if they are or know of someone who
repairs the AEA keyer line.


Gary K8IZ
Washington State Resident
Registered Linux User # 312991

Howdy Kirk.....Hope this doesn't sound too obvious but have you tried
any rudimentary troubleshooting yet? Though I don't know your
particular keyer, I'd suggest opening it up and either running it or
letting it stay powered up while testing to see if it works the same or
is now ok or better (air circulation to confirm heat related)....during
this time observe components (touch or temp probe with your meter etc)
for excessive or isolated warming (one component or one area etc). Once
the problem occurs, if warming (a ballpark would be parts getting
uncomfortable to touch) is observed, try hitting them with a jet of
freeze spray (or even cool compressed air) to see if the problem
changes. Check basic power supply voltages (look for a regulator chip to
get the value and/or check the basic specs of various chips or the one
keyer chip for its intended operating voltage). One specific thing that
comes to mind is that some keyer circuits utilize diode logic switching
at the paddles (diodes might be elsewhere though) and in particular
sometimes a diode is across the paddles......it "might" be that if this
was failing you could get the symptom you described. This basic
troubleshooting can be done without schematics if a little care and
common ham-knowledge sense is used so..........have fun.......let us
know what ya found.

73 - Gord - VE1AJF

Howdy Kirk.....Hope this doesn't sound too obvious but have you tried
any rudimentary troubleshooting yet? Though I don't know your
particular keyer, I'd suggest opening it up and either running it or
letting it stay powered up while testing to see if it works the same or
is now ok or better (air circulation to confirm heat related)....during
this time observe components (touch or temp probe with your meter etc)
for excessive or isolated warming (one component or one area etc). Once
the problem occurs, if warming (a ballpark would be parts getting
uncomfortable to touch) is observed, try hitting them with a jet of
freeze spray (or even cool compressed air) to see if the problem
changes. Check basic power supply voltages (look for a regulator chip to
get the value and/or check the basic specs of various chips or the one
keyer chip for its intended operating voltage). One specific thing that
comes to mind is that some keyer circuits utilize diode logic switching
at the paddles (diodes might be elsewhere though) and in particular
sometimes a diode is across the paddles......it "might" be that if this
was failing you could get the symptom you described. This basic
troubleshooting can be done without schematics if a little care and
common ham-knowledge sense is used so..........have fun.......let us
know what ya found.

73 - Gord - VE1AJF