Hi,
Now that 10 is alive and well, I decided to put the B line (T-4XB, R-4B) on 10.
Hasn't been there in a long time.
The low sensitivity part:
The R-4B has low sensitivity on 10. I do not recall that from 20 some years ago
when I was last on 10 with it.
Using the R-4B to control, the calibrator will get an S meter reading of about
S5. Using the T-4XB to control the calibrator will yield an S8 reading. This
was done at 28.5, and this is after adjusting the 4 trimmers for 28.0. I notice
the same results using the cw range (28.0 - 28.5) crystal at both 28.0 and at
28.5. I do have 28.0 and 28.5 crystals in both the R-4B and the T-4XB. A low S
meter reading is also obtained using the 24.5 meg crystal that I have in an
accessory socket of the R-4B (I do not have one for the T-4XB). As expected,
"real signals" are louder using the T-4XB to control.
This situation did exist on 15 meters, but adjusting the 21 trimmers did take
care of that.
The low output part:
Using the R-4B to control, power out is low. About the best it can do is 30
watts with .16 plate current.
Using the T-4XB to control (transceive), about 75 watts with .26 plate current
(gain full open)
Using the SEPARATE position about 110 watts with .32 plate current (gain at a
bit less than 12:00)
Power readings as per wattmeter in C-4, so may not be accurate, but they are
relative.
I think the low sensitivity and low output problems are related, but I am not
sure why the output would vary so much between the T-4XB as the transceive
control and the separate control.
Any ideas welcomed.
Thank you,
Jim
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