Dale -
There is only one problem with that modification. In the 'normal' circuit, C134 is charged in the
'resting' state. When the key is first pressed, (or VOX or PTT,) this cap is discharged into V10
Grid to provide a positive 'pulse' and yank the relay in HARD and FAST to avoid the first dit or
syllable being chopped short.
Depending upon the relay and circuit, you may or may not find this to be a
problem.
As usual with Drake, things are not always what they seem!
--
73, Garey - K4OAH
St Charles, IL
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
[email protected] wrote:
Put the T4X on the bench today, noticed the relay had been changed out. I found a sealed relay in
place of the open frame relay. The relay was for 12 vdc.. they powered the relay via a small
rectifier and a small filter network,taken from the 12 volt ac feed to the rig from the AC-4.
The Ptt circuit is now 12 vdc at the mic jack. I tried to follow what was changed in the PTT
wiring really hard to follow as they wove the new wire into the old harness. I set the rig up with
the ac-4, and checked it out. Everything seems to work as it should, T4X had no trouble tuning to
full output.
I guess the question is , this mod seems to work fine ,as its done ,is there any thing I
should be concerned about using the mod , as to the way the T4X was originally set up? any one see
any pitfalls ?
thanks
dale wt4t
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