Thanks Robert and thanks to all who responded to my question. Obviously there is much experience and knowledge in this group.
73 de N3XPD Mike
Robert Schenck wrote:
HI Mike,
Welcome to the world of the Drake equipment!
There ar ethree adjustkments that you ahev to do to correctly balance the carrier. They are C6, Carrier frequency trim, R21, carrier balance, and C17 Carrier balance/phase. You should firest check that the carrier frequency trim is correct. the idea with this adjustment is to place the carrier on the same point of each sideband filter skirt. that is, to be just as far down on the lower skirt of the USB filter as you are on the upper skirt of the LSB filter. This is usually done by deliberatly unbalancing the modulator so that carrier leaks through. You measure the amplitude of the carrier on a test receiver and compare the level between the USB position of the T4X SSB switch and the LSB poisition. The carrier amplitude should be close to the same as posible. BY adjusting the carrier frequency trim, you set the carrier to the correct frequency for both modes. I would only mess with this if there is more than an S unit difference.....
Then you can adjust the carrier balance pot, R21 for minimum carrier. you have to also adjust C17 the carrier pahse. Note that you should check for balance in both USB and LSB modes. you will have to adjust the trimmer, C17, for optimum carrier null for noth sideband modes, and to has to deal with the slight difference in reactance reflected back from the selected filter. Now, if you only operate 20 Mtr USB, for example, you could just tweak it for USB. Same is true for LSB only on a l;ower band. But, it is best to balance it for each mode.
Hope this helps.
73's
Rob K2CU
Mike Warner <[EMAIL PROTECTED]> wrote:
Hello to all on the list,
I recently cleaned all of the switches and pots in my T-4XC and as a result I disturbed the setting of the carrier balance pot (R-21).
I am having some trouble understanding the procedure that is in the manual .
It states to adjust this pot for minimum S meter on another receiver. I tried to do this and I think that I got it ok but am unsure.
Any experience with this on the list and if so any tricks, tips or words of wisdom from experience would be greatly appreciated.
Also, when I was cleaning this pot, I was trying to run it through it's full range and found that apparently it does not have any stops, or mine is broken.
Does anyone have any details on the mechanical construction of this pot? I have have never seen one like this before.
Thanks from a Drake newbie, 73 de N3XPD Mike
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