Hello all.

I have on the repair bench a Traeger model 48S3 transceiver, possibly 48-3, the “S” is very small. I don’t suppose anyone has a circuit diagram for it? It is like this one here: http://www.radiomuseum.org/r/traeg_48s3.html

Cheers, Stuart

Hello Stuart can you please email me . I have a favour to ask you.

Similar model circuits emailed to Brad, may help?

Traeger Transceiver 43 Circuit
Traeger Transceiver 43 Data
Traeger Transceiver 48 Info
Traeger Transceiver 48 Info
Traeger Transceiver 48 Circuit
Traeger Transceiver 48 Parts List

Thank you for that. The circuits don't match this radio but the receiver section of the 48S20 looks to be close, and I'm only going to restore this section.

Cheers, Stuart

Anything close is often an advantage. Valve radio circuits do not vary that much. In a transceiver you may find extra caps on the same rail. Do not replace them with a single cap. they are spaced out like that to decouple RF the transceiver puts out from forming "standing waves" on the wires and destabilising the thing.

Marc

Update. I've just discovered that the vibrator power transformer secondary is open circuit! It looks like I'll have to put this on the back burner, with all the others!

Stuart

Something to consider: I have collectors that I often fix stuff for. These guys have several battery powered sets & one was live chassis AC / DC. What was done here was to make up stand alone power supplies.

In one case the PSU has a module that outputs more than one fixed and regulated Voltage output like 45V for detector, 135 for others and so on. The bias is a separate winding for the DC filaments. (AC heaters will run on DC) To me that gives better isolation.

It would be quite simple if you are not going to repair the vibrator circuit, to fit a flying lead using a valve socket & base to carry the power. The PSU's built that are not dedicated to one radio, have the pin outs such that the individual radio plugs will only pick up their voltage/s (no accidents) and will not fit the dedicated ones.

Transistors like TIP50 will handle the current &voltage when used for regulator bypass. The only trap is that with many Solid State regulators, they go crazy due to the way the utility power is wired, if grounded. That is over come by the use of a 0.01 line cap to ground.

Marc

Update. I rewound the transformer and have restored the set. It works great, with excellent sensitivity with the original vibrator, after careful alignment. Actually I used the one from the transmitter, as it works better than the one originally used with the receiver. (They are both the same type.) The H.T. had been deliberately shorted by a hidden wire! Took a while to find that. It would have taken a lot longer without a circuit.

Thanks, Stuart