[ARC5] BC-348 Dynamotor

[Mike Morrow]

Mike F. says:

>> Sure, I agree with that. However, he said he plugs the AC supply in the same
>> connector where the dynamotor goes. I do not remember what he may have said
>> about running the dynamotor by itself. 73 - Mike 

Ken says:

> Well, I have not yet seen a clear indication as to whether the problem is in 
> the dynamotor or in the receiver. So far, it seems to me as though the 
> problem could be in either one.

It is true...Mark stated that the radio works fine on AC, and then continued with a description of what he did to install the dynamotor, followed by description of the abnormally low speed developed ten minutes later.

The BC-348-* does not use a dynamotor connector plug, so I'm not sure what the talk of a power supply/dynamotor "plug" refers to.  Also, my bet is that the statement about AC operation is historical, and was NOT a condition that was tested AFTER the dynamotor was first installed and its presumed "failure" was observed ten minutes later.

Mark, let's clear the smoke of ambiguity from this discussion by disconnecting dynamotor screw terminal 5 (+HV) from the receiver.  Turn the 28vdc power and receiver on and see if the DM-28 spins up to normal speed.  If it does NOT, your DM-28 has a problem.  If it spins up normally, you have a HV short in the receiver.  A capacitor short is very common and should be expected if you are using the original capacitors on the HV lines with the dynamotor's full output voltage before failure.

Mike / KK5F




>
>We have to eliminate one or the other in order to determine where the true 
>problem lies.
>
>The simplest thing seems to me to run the dynamotor without it being 
>connected to anything ex