Le 15/07/2010 20:48, Antonio Vernucci a écrit :
Mine has the same behavior, and the technical manual says that it's
the way it works so no problem.

Furthermore it seems rather logical as in A.M. mode the H.T.s are only
required when the mike paddle is depressed... The dynamotor speed
settle time is acceptable in this mode but try to figure out the
dynamotor being turned on and off at the keying speed in CW!

Hope this helps,


Thierry
--

Thanks for information. OK for CW, though for AM it gives me a strange
feeling to hear the dynamotor starting every time I push the microphone
PTT. In the BC-191 / BC 375 the dynamotor instead runs continuously,
either CW or AM.

I have built an AC power supply for my ART-13 and I must now adapt its
control logic to that of the ART-13, which is not immediate to
understand because the schematic diagram is not easy to read (so many
relays ...) and the service manual describes things using a rather odd
sentence structure, difficult to follow. I do not succeed to get the
antenna relay energized in any way, so I fear I'll have quite a hard
time in the near future to have it in working order.

73

Tony I0JX
Rome, Italy

You're welcome, it's always a pleasure to have an opportunity to read or
to talk about this wonder.

About the behaviour of the dynamotors on the wwii US transmitters I can
add that on the BC604-684 it also goes on and off depending of the ptt
or tune button.

I must say that I've not powered up my T-13 for a while, about 22
years... A true shame. I've got all the components including a very
strong 19" rack to build an AC P.S. in storage, waiting for the right
day to come as the dynamotor seems to be a little too much an outdated
item by today's comfort, noise and energy savings standards.

In fact I'm still hoping to have enough spare time someday to get a
license to use this Tx. as it should be, not only to power up a dummy load.

I'll have a look in my documentation as I believe I could have some
schematics showing the connections required on/between plugs to operate
the Collins with a separate mains supply.

Also, I would be glad to know if you've got any help from ICP for your
RF ammeter?


73,

Thierry



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