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If the carrier balance adjustment does nothing something is seriously wrong. Go over the carrier balance adjustment on P,15 of the handbook. The balance control should show an definite null. It is more common that a good null can not be achieved than that the modulator can not be unbalanced but in either case something is wrong. When working properly the balanced modulator has a very good null, you really need to set it using a receiver lightly coupled to the output. C-6 will affect the null but usually in making it impossible to get a null.
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Go over the adjustments again and see what you find. I am disturbed that the original problem may not have been a bad filter but whatever is causing this to happen. A story: when I first got my T4XB I could not null the carrier. After I got Garry's discs I found the wiring in the photographs didn't look write. I asked Garry and he confirmed that what was in mine was not correct, although it looked factory. In fact, the circuit is quite sensitive to stray capacitance. With the wires as they were the modulator could not be balanced. I moved them and got the correct deep null. So, look for something out of place. You should be able to get a substantial amount of carrier by unbalancing the pot. Actually, you need it for alignment. On 1/15/2025 10:28 PM, Tony Sokol via groups.io wrote:
?Hi Gang, --
Richard Knoppow Los Angeles WB6KBL SKCC 19998 |
