Tram D201

[293]

I have a Tram D201 23 ch the manual tuning have been unlocked to where it transmit's and receive's, my problemis that the receiver is more sensitivity on the lower end of the band and greatly unsensitive on the upper end of the band, say channel 40 for example. Can an ajustment be made to equal the receive on both ends of the band and if so which ones are they? Thanks..293

[TheCBDoctor]

Hi 293

Your Tram D201 was modified for 40 channels using the manual receiver. It is a simple tank circuit with no reference crystal. The drawback is during manufacturing it was tuned for the legal 23 channels at the time. Many of the components were designed for a narrow "Q."

After 40 channels became legal those circuits were modified to allow for the expanded channels. Tuning the radio for the higher channels may cause you to lose some sensitivity on the lower channels. The only Sams Photo Facts is for the first version of the Tram D201. This should work; it is CB-88. Go through the tuning section and your performance may improve. If it does not, then you may have to modify the receiver using resistors in parallel with the tuning cans to widen your "Q."

The resistors would be from 100K to Meg Ohm. This may cause you to get some cross-channel interference if you modify the radio. The selection of the resistor values is critical. Unfortunately, there is no Sams for the D201A, which would help you identify the factory modification.

I have provided a link to some Tram info. I am still in the process of adding information. Do you have the first version (point to point wiring) or the second version (Pre-made clad board) of the Tram D201?

Tram D201 23 Channel: [Please login or register to view this link]

Respectfully,

[293]

I have the pre-made clad board.........Thanks 293

[293]

I wouldn't mind loosing a little on the lower end cause I run from 19 to 40 anyway if it could be done with a simple adjustment rather than build a circuit which is over my head anyway.........Thanks 293

[TheCBDoctor]

Hi 293

If you can get a hold of a Sams Photo facts # CB-88 you should be able to retune it.

Respectfully,

[293]

I don't have a signal generator that I can trust, so is it possible to key up from another radio to get a signal and tune for the upper band from it........a cb 88 is hard to find.......Thanks 293

[TheCBDoctor]

Hi 293

The problem with using another radio is you will not be able to keep a steady 1,000 Hertz signal at 30% modulation. The signal level should be able to go down to .1 micro-volt. Give it a try by using a dummy load and moving the radio further away as you tune the D201. If you can generate a 1KHz tone at the mic of the other radio it may work.

Unless, you have experience tuning radios, I would not try it because you may put the radio out of alignment and never get it back without the proper equipment.

Respectfully,