RadioBanter - View Single Post - Starting up a DM-21 Dynamotor

December 1st 03, 05:28 PM

(Derek Cohn/WB0TUA) wrote in message . com...
Dear Friends,

I just picked up a BC-314-G (MW version of BC-348).

I think you mean "BC-312". The BC-348 is an aircraft rx.

The BC-344 is the AC powered version.

It came out of
the estate of a long deceased ham so I don't know how recently it was
used. I would like to begin the restoration process and will start
with the dynamotor. I have read TM11-850 N which covers this radio
and the only maintenance mentioned for the dynamotor is one drop of
oil in the bearings.

If I'm going to start up a dynamotor that hasn't been run in a long
time, does this one drop of oil in the bearings sound sufficient?

No!

Is
there any other recommended maintenance to get this thing lubed
properly so I don't burn up the bearings when applying power?

I'll defer to the dynamotor experts but the least I'd do read the
manual on overhauling the dynamotor, and open it up to see how much
lube is in there.

The former owner may have kept it oiled, so it may be fine, but you
have to look.

The manual for the BC-312 is on the excellent KG7BZ website, and there
may be good DM-21 info in there.

Also,
it's a 12 - 14v dynamotor. Is it recommended to start it on very low
voltage and increase it slowly to the recommended operating voltage?

Not really - the Ancient Ones just threw the switch and let 'er whine!

Thanks for any help you guys can give me!

Good luck! No ham bands from 150 to 1500 kHz, but what a BC receiver!

73 de Jim, N2EY