[DEMI] 2304-144 TX relay +R TC board (update)

[mburt]

Guess I'll reply myself.  Got the +R working.  The problem itself was
minor, but I was surprised that the documentation did not explain that
the diode D2 is not required on the TC board if you are using  TTL H for
keying.  I simply removed D2 and installed a jumper there connecting the
collector of Q1 to D5.  After this K3 was pulling in and I had my +27V
open circuit to the antenna  relay as per the instructions.  Now I just
need a local sched for a real test!  see you on the bands -
73, Matt
KF0Q

mburt wrote:
> 
> OK - I have not received any reponse on my query about the +R antenna
> relay output from my DEM TC board yet.  (I was out of town too for a day
> this weekend as well-)  After some more troubleshooting I have found
> that K3 on the TC does not switch after all.  I am keying the TC with
> the PTT H input via my 290rII which seems fine... K1 and K2 pull in -
> the collector of Q1 (junction with D2) goes low - but K3 never changes.
> Has anyone built a new TC board successfully since may '2000?  I am just
> wondering if the board layout is correct - the date on my schematic is
> 5/08/00.  I never measure any voltage on the neg term of C13 which tells
> me that K3 never switches.  My K3 is mounted on the top of the TC board
> just like K2.  I have checked all diodes in the circuit and everything
> tests fine - any help appreciated
> 73, Matt
> KF0Q
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