Bernd Maestling wrote:
> Hm,
>
> the HEX file looks like yours. The 5.2V at L1 don't change
> when I rotate the capacitor, so I think there must be
> something unlocked or wrong. The only thing that is changing
> is the red LED on the front going to light in TX mode and the
> current increases from 0.1A to 0.3A.
>
> With my counter I can measure frequencies between 400 and 500MHz
> at the measuring point in the first stage. It will change when
> I rotate the capacitor.
>
> 73
> Bernd
>
Bernd,
The TX should draw much more than 300 mA when in TX. If the synthesizer
is not locked, the output section will be disabled to prevent
transmitting off channel. Not sure how the voltage is staying at 5.2V if
it is unlocked. Try flipping DIP switch 8 to off and power the T856 off
and on again. Check TP12 (VCO Lock Detect). It should be low if the
synthesizer is in lock.
Do you have the manuals?
Is your TCXO 12.8MHz?
Ed Yoho
WA6RQD
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