[DSP-10] DSP-10 troubleshooting - false alarm

[Don AE5K]

On 04/12/2013 03:45 PM, Joe wrote:
> Don,
>
> I think that the jumper between the two RCA connectors is the transmit 
> RF before the PIN diodes.  This is where I place an attenuator when I 
> need only a Milli-watt of excitation.  Maybe you could measure the 
> power there.  Or is the jumper missing?
>
> Joe WB8DNO
Hi Joe, and thanks for the message.  I think you mean the r.f. tx 
output/input connectors on the enclosure.  I use BNCs here instead of 
RCA.  I do have the jumper in at this point, but I will take it out and 
connect the power meter directly to the P3 power out from the 2N5109 
final amp to eliminate the possibility of those PIN diodes not working 
right.  In previous messages, the PIN diode that I was referring to was 
at the input to the tx amplifier chain consisting of U4 U5 and Q2.

Don AE5K