[hpsdr] TR keying - Penelope - CW output

[Bill Tracey]

I'm not the hardware expert of the crew, but looking at the datasheet 
for the ULN2003AD it would appear you want to connect Pin 25 of the 
DB 25 connector to +V of your load if it is inductive.   Your load 
gets wired to +V and one of the OC connectors.   The OC pin will go 
to ground to activate your load.

Regarding distortion ... how are you monitoring the Penelope 
output?  Could the receiver you're listening on be getting 
overloaded?   Is the distortion a keying transient, or do you hear it 
for steady key down?

Regards,

Bill (kd5tfd)

At 04:24 PM 5/15/2008, Hank Wolfla wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>
>Does pin 25 of the 25 pin connector need to be connected to the 
>source voltage that is required
>by the device you are keying from pin 9 of the connector?  I have 
>the transmitter working well,
>but have found that I hear distortion on the output when running 
>more than 0.1 watts on CW.  Anyone
>else having this problem running over 01 watts with the unit (50 ohm 
>dummy load)?  FM & AM
>sound great, and SSB sounds great at low power.
>
>Thanks,  Hank - K9LZJ



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