Just picked up a 1930s Battery operated Coronado

[old_coot88]

Originally Posted by vortalexfan

...I hear the Coronado's Oscillator on the Transistor radio is at 640 AM on the dial or very close to that spot anyways and when I go up the dial the oscillator noise kind of dies off the higher up the dial the tuner goes (on both radios).

So I'm guessing my oscillator is working but not correctly...

The osc is not running, period. Just a note on basic superhet practice (for convenience, say the IF is 460): When the radio is set up and aligned correctly, the osc will always track 460 on the high side of the received signal. So whatever station is tuned in, its signal will 'beat', or heterodyne, against the osc, generating the Intermediate Frequency of 460 khz, which is then sent downstream, amplified and detected.

Um.. what does O.L. stand for?

[vortalexfan]

Originally Posted by old_coot88

The osc is not running, period. Just a note on basic superhet practice (for convenience, say the IF is 460): When the radio is set up and aligned correctly, the osc will always track 460 on the high side of the received signal. So whatever station is tuned in, its signal will 'beat', or heterodyne, against the osc, generating the Intermediate Frequency of 460 khz, which is then sent downstream, amplified and detected.

Um.. what does O.L. stand for?

Ok, that's what I figured.

O. L. I believe means OverLoad(ed).
Anyways that's just a guess, because every single Digital Multimeter I've ever owned always showed some variation of the O. L. designation for the "infinite" or "open circuit" reading on the multimeter display.

Anyways I think I'm going to need new Osc. and Ant. Coils, or at least an oscillator coil.

[Kevin Kuehn]

Just for giggles does your meter show zero ohms when you touch both test probes together?

I guess you need to make the call of how badly you want to fix that radio. I looked on ebay and see a few 14-4034 Osc coils but sellers apparently think they're setting on the last ones on the planet.

[vortalexfan]

Originally Posted by Kevin Kuehn

Just for giggles does your meter show zero ohms when you touch both test probes together?

It measures 0.3 Ohms when I touch the probes together. Why?

I guess you need to make the call of how badly you want to fix that radio. I looked on ebay and see a few 14-4034 Osc coils but sellers apparently think they're setting on the last ones on the planet.

Well I've already sunk about $50 into this radio...

[Kevin Kuehn]

Originally Posted by vortalexfan

It measures 0.3 Ohms when I touch the probes together. Why?

There's always a little contact resistance at the connectors and prob tips.

[vortalexfan]

Originally Posted by Kevin Kuehn

There's always a little contact resistance at the connectors and prob tips.

Yes, which I was aware of, but what does that have to do with your "just for giggles" experiment about my oscillator and antenna coils being bad or not?

[vortalexfan]

OK here's a shot of the undercarriage of this radio.

Is there anything that looks out of place to you guys (besides the previously removed oscillator coil)?

[Kevin Kuehn]

Originally Posted by vortalexfan

Yes, which I was aware of, but what does that have to do with your "just for giggles" experiment about my oscillator and antenna coils being bad or not?

I didn't understand how you'd expect the radio to pick up stations all the while knowing those coils were open. But in the end the important things is you're making good headway.

[vortalexfan]

Originally Posted by Kevin Kuehn

Just for giggles does your meter show zero ohms when you touch both test probes together?

I guess you need to make the call of how badly you want to fix that radio. I looked on ebay and see a few 14-4034 Osc coils but sellers apparently think they're setting on the last ones on the planet.

I just looked on feebay and those coils are only $15 or so, which isn't too bad.

Just picked up one of these Oscillator Coils for $13 with free shipping.