[TenTec] TT Argonaut 509 Control board?

Mike Bryce prosolar at sssnet.com
Sat Jul 25 21:39:36 EDT 2020


Remove the loads from the control board and see what the voltage is then. It’s possible somewhere along the +8 volt line is pulling more current and thus dropping the voltage. Separate the loads from the card and see what happens

Mike Bryce WB8VGE
prosolar at sssnet.com

"The eye is always caught by the light, but shadows have more to say"

> On Jul 25, 2020, at 9:08 PM, William Redfearn <n4elm at bellsouth.net> wrote:
> I'm looking for a 90192 Control board for a TT 509.
> Apparently this is a very early one as it does not match my other 509 or the manual.
> The problem is the 8 volt power supply section is dropping to 5.3 volts when the radio is turned on.
> Voltage & resistance measurements and substitution have proved this out.
> Any control board from a 509 or 515 should work.
> Thought I'd see what I can find before I pull the discrete components and put in something like a 7809 regulator.
> Thanks!
> 73 - Dave, N4ELM
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