On my schematic, C176 is the audio feedback electrolytic in the audio
output section. Doubt if that would cause a 10M only issue.
Itis normal for the cal signal to be weaker in the higher freq bands.
The harmonics from the 100kHz osc get progressively weaker.
If you use another drake t4x, leave the r4 in "on" and listen to
yourself. you should have to turn the rf gain down to 1/4 but should be
nice and clear. It should also hear the "spot" mode well.
ALL of the electrolytics should be suspect if they are originals. The
ones in the PS and audio sections will cause hum and general unpleasantness.
Curt
KU8L
Carey Lockhart wrote:
hi Curt
i did try peaking the different stages. when i tune to
the calibrator signal i am only getting about 2 s units. as i go down
the bands it move up in signal strength. i guess its just me.
i haven't been playing with drakes very long so i really do not know
how they are supposed to act.
now i did find that c176 has a crack in it. maybe thats it.
Carey Lockhart, KC5GTT
[email protected] <mailto:[email protected]>
www.kc5gtt.com
On Jan 4, 2009, at 5:30 PM, Curt Nixon wrote:
Hi CArey:
If it only on 10M, it is unlikey to be an audio issue. More likely
an issue related to one of the bandswitched stages. Have you tried
peaking the inj and rf amp trimmers for 10?
10 is pretty quiet these days here but regulart QRN should show up
just like it does on 20 or 15 when they are closed down.
I use R-4a ser # 6131--with the transistor VFO. Original owner.
Curt
KU8L
Carey Lockhart wrote:
well my r4a is turning out nicely but i am not sure about 10m. i
have to turn the volume up to almost 2 o clock to here any noise. is
the r4a deaf on 10? or do i maybe have a audio problem? the serial
is 2952. i noticed some circuit difference when comparing it to
another parts r4a i have. this one also has one more tube the other
dose not.
i am guessing this is a early model. does anyone have the same
situation?
Carey Lockhart, KC5GTT
[email protected] <mailto:[email protected]>
www.kc5gtt.com
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