Tim,
I had a similar problem. Not with an XD keyer, but my own keying
interface. The optos worked fine for the RTTY FSK keying, but
didn't work for CW. So, I swapped out the opto for a standard
2N2222 (or equiv) keying circuit. This was also on a 990. Maybe
something's weird in the keying line - dunno.
73 Barry
On 21 Oct 00, Timothy R. Mohr , AA9RR wrote:
>
> I just finished assembling my W5XD keyer, and seem to have run into a
> problem. My rig does not seem to key up at all! I hooked an oscope to pin 17
> of U2, and I can see the CW is being sent. But it looks like the opto
> isolator isn't doing squat. I had to use the alternate part, the
> H11A817CQT-ND in my construction. Do I have to change the biasing of R3 and
> R4 ? I am trying to key up a FT-990. Any help would be appreciated!!!!!
>
> 73,
> Tim Mohr
> AA9RR
>
>
> --
> WWW: http://www.writelog.com/
> Submissions: writelog@contesting.com
> Administrative requests: writelog-REQUEST@contesting.com
> Problems: owner-writelog@contesting.com
>
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA FRC alternate: barry@w2up.wells.com
--
WWW: http://www.writelog.com/
Submissions: writelog@contesting.com
Administrative requests: writelog-REQUEST@contesting.com
Problems: owner-writelog@contesting.com
|