My TM-733A has no UHF transmit. Everything else works.
I read the text in the PDF copy (poor quality, Board layout diagrams useless) and it says the signal is generated directly.
If I probe the driver circuitry with my insulated pickup loop attached to my spectrum analyzer, I show a small signal in the 380 Mhz range that changes with frequency change. This seems to indicate that a product of the 12.8 Mhz xtal oscillator is not being produced or not mixing with the 380 Mhz signal to produce 440 Mhz input to the final amplifier "brick".
Three questions: Has anyone else seen this. If so, am I on the right track? Does anyone have a LEGIBLE schematic and pictorial of the boards? The PDF I have is, to put it mildly, awful. Any help/ideas would be appreciated. This is too nice a rig to sit idle. I don't think it's the final amplifier. There is no input to the "brick" so there is nothing for it to amplify. Thanks..
I read the text in the PDF copy (poor quality, Board layout diagrams useless) and it says the signal is generated directly.
If I probe the driver circuitry with my insulated pickup loop attached to my spectrum analyzer, I show a small signal in the 380 Mhz range that changes with frequency change. This seems to indicate that a product of the 12.8 Mhz xtal oscillator is not being produced or not mixing with the 380 Mhz signal to produce 440 Mhz input to the final amplifier "brick".
Three questions: Has anyone else seen this. If so, am I on the right track? Does anyone have a LEGIBLE schematic and pictorial of the boards? The PDF I have is, to put it mildly, awful. Any help/ideas would be appreciated. This is too nice a rig to sit idle. I don't think it's the final amplifier. There is no input to the "brick" so there is nothing for it to amplify. Thanks..
