[DSP-10] Continuing troubleshooting

[Don AE5K]

On 04/12/2013 04:09 PM, Scott wrote:
> Not familiar with the schematics, but I would say the +10T would go to 
> +10V when switched to TX mode.  If you have 0V, is there a 10V 
> regulator (perhaps 7810?) that could be bad.  If so, is there voltage 
> at the input to the regulator?  If there is and no output, it could be 
> a bad regulator IC or the +10T line shorted to ground.  If you have a 
> link to the schematic, send it to me and I'll take a look.
>
> N0EDV
> Scott
>
>
> On 4-12-2013 21:02, Perry Ogletree wrote:
>> ??????????????????????????????????????????
>> -----Original Message-----
>> In tx mode, the +10T line is zero.
>> ??????????????????????????????????????????
>>
>> Isn't the +10T line supposed to be +10 volts IN transmit, not 0 
>> volts.  As I
>> recall, that line was the power for the PA chain. That would explain 
>> your
>> low power readings!
>>
>> Perry - K4PWO
>>

Gee, another eagle eye.  Thanks Scott.  Haven't heard from you in a while.

The original schematic(s) appeared in the 3 part article on the DSP-10 
in September, October, and November 1999 QST by Bob W7PUA. If you are 
ARRL member, you can see them in their archives.  I think they are also 
available on Bob's DSP-10 page too.

I know I have awaken this reflector -- probably the most traffic in 
years on it!  I can use eyes looking at my problems and proposing tests 
or "just tell me what's wrong" hi.