[MRCA] [MMRCG] DY-105B testing questions

[Jason WA6BBQ]

Test load resistors calculated (Thanks again Tom!) scrounged, DY-105 tested
satisfactorily, interconnecting cable fabricated, (the time consuming part)

GRC-9 on the air last night!

CW only so far, put an RBN spot into AZ from SoCal on 3550. Tonight I’ll
locate my stash of T-17 mics and try it out on AM. Maybe even crash the AMI
net with it, ha!

Thanks everyone!
Jason WA6BBQ

On Mon, Apr 27, 2026 at 10:39 Jason Sogolow via groups.io <w6iee.73=
gmail.com at groups.io> wrote:

> Hi, I’d like to test and verify that my DY-105B is putting out correct and
> safe voltages before attempting to power up my GRC-9 with it.
>
> I can trick the dynamotor into starting and can see appropriate HV, but
> all the low voltage circuits apparently want to see a load, and that load
> appears to be integral to regulation.
>
> Open circuit, the 1.5v supply shows 24 volts… Not confidence inspiring.
> Blowing up one 3v flashlight bulb is one too many.
>
> Has anyone come up with test loads that would cause the thing to operate
> as expected?
>
> Thanks,
> Jason WA6BBQ.
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