[DSP-10] 5V at D1-A1

[Matthew J. Wolf]

The outputs of U107 look good.

When the RF Board is first power QA though QH are high.

Here is what I measure at QA though QH. Also here that I measure at R137 
though R144 on the side facing the diodes.

QA  5.019      R137  1.253
QB  5.020      R138   1.185
QC  5.010      R139   1.331
QD  4.860      R140   1.467
QE  5.018      R141    4.938
QF  5.018      R142   4.984
QG  5.018      R143   5.008
QH  5.018      R144   5.018

I'm thinking that I should try different values for R141, R142, R143, R144.

-Matthew


kd7ts wrote:

>If the UHFA program is running, and you have serial
>communications with the DSP-10, then the voltage should
>respond to the RF gain sequence <SHIFT><F-7> or <SHIFT><F-8>
>or the up and down cursor keys.
>
>Here is a table of values for the U107 outputs
>
>    RF Gain QA QB QC QD QE QF QG QH
>       100   0  0  0  5  0  0  0  5 Volts 
>       94    0  0  0  5  0  0  5  0
>       88    0  0  0  5  0  5  0  0
>       82    0  0  0  5  5  0  0  0
>       76    0  0  5  0  5  0  0  0
>       70    0  5  0  0  5  0  0  0
>       64    5  0  0  0  5  0  0  0
>
>     These U107 Voltages should be seen if the serial lines
>are working, regardless of what is happening in the PLL
>IC's.
>
>lifted from:
>
>http://www.proaxis.com/~boblark/dig_ser1.htm
>
>Hope this helps
>
>Mike KD7TS
>  
>