CRT Hercule Turbo no Modulation

Wenefe · 2026-01-11T20:18:37+0000

Hello

I have a CRT Hercule Turbo

Unfortunately, it has no modulation in any operating mode

I would appreciate your help
Best regards from Austria

sp5it · 2026-01-11T20:34:09+0000

And that's a reason to post in old threads?
We unite in pain.
What measurements and tests you done so far?
Mike

Wenefe · 2026-01-11T20:48:54+0000

sp5it said:
And that's a reason to post in old threads?
We unite in pain.
What measurements and tests you done so far?
Mike

Thanks for the quick reply. The device was already with a technician, but unfortunately he gave up. Now I want to try it myself. I have measuring devices, soldering stations, etc. I just need a nudge in the right direction.

sp5it · 2026-01-11T22:04:37+0000

Ok, lets start. Link schematic for your radio.
Mike

19wrc333 · 2026-01-11T23:29:25+0000

sp5it said:
Ok, lets start. Link schematic for your radio.
Mike

The schematic can be found here: http://78roger.free.fr/crt/hercule_turbo.htm at the end of the service manual that is linked down there.

sp5it · 2026-01-11T23:57:32+0000

Apply audio from signal generator on microphone socket, put it on TX and check if on pin1 marked blue you have a signal from generator. If not, follow red line back to mic socket to find where it disappear.
Mike

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CRT Hercule Turbo no Modulation

Wenefe

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sp5it

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Wenefe

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sp5it

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19wrc333

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sp5it

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