Hello All,
I have no output on any band. This problem has been intermittent now is
all the time. I have just one replacement 6jb6 so I swapped them one and
the other. There is a correct bias current at idle. I checked the grid
of 6jbs's it was measured at 2.5 VoltsPP. My scope measures freq
My T4XC began providing full output on cw regardless of where the drive control
was set--even all the way CCW. Normally on CW you have to advance it beyond 12
o'clock for full output.
I consulted with Garey, K4OAH, and at his suggestion, checked R-105, the xmit
gain control for continuity and
Rick -
Check the DC voltage on the shielded wire at T14 (center pin on side
closest to CAR BAL pot). In CW mode, this voltage should be 0.0 with
the GAIN at MIN, rising to about a volt as the GAIN is turned up. IF
the voltage does NOT go to 0 at MIN, there is a problem with R105/R15,
Rick,
Is this on any particular band? Does the power out vary with position of the
TUNE and LOAD controls? Does this happen into a dummy load? If the PA goes into
parasitic oscillation power out will go full bore with the slightest
advancement of the GAIN control.
Also if there is an issue
Last night, my T4XC was providing full output on cw regardless of where the
drive control was set -- even all the way CCW. Normally, on cw you have to
advance it beyond 12 o'clock for full drive. I checked and double checked all
switch settings, etc. Any suggestions?
Thanks
Rick
with
your rig there!
~73~ de Eddy VE3CUI - VE3XZ
***
- Original Message -
From: Rick Tucker
To: drakelist@zerobeat.net
Sent: Thursday, January 07, 2010 9:10 AM
Subject: [Drakelist] T4XC drive
Last night, my T4XC was providing full output
Rick -
Check R105 and R106 and associated wiring for continuity and value. If
R105 opens at the bottom (ground) end, R106 or its wiring open up,
full drive regardless of GAIN control setting.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
7 matches
Mail list logo
