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Old 12th Aug 2020, 6:21 pm   #1
Burnt wire
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Default Marconi oscillator

Ive been offered a Marconi oscillator, having never used such a thing, I was wondering would this be of any use in restoring valve radios ?? Advice glady taken....
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Old 12th Aug 2020, 6:28 pm   #2
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Default Re: Marconi oscillator

Might be, do you have a model number? If an RF generator, with modulation, then yes!
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Old 12th Aug 2020, 8:07 pm   #3
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Default Re: Marconi oscillator

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Originally Posted by kalee20 View Post
Might be, do you have a model number? If an RF generator, with modulation, then yes!
One is an oscillator TF1247, and also been offered a circuit magnification meter, TF1245, So would be a help if i could find out if they are any use.
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Old 12th Aug 2020, 8:54 pm   #4
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Default Re: Marconi oscillator

Marconi TF1247 is the VHF oscillator, covering 20 to 300Mhz. It operates at quite high power, and at very low impedance. You would have to make up a simple transformer (1 turn to 20 say on a ferrite ring or core) to step the output up to about 50ohms. And then the output can be varied up to about 4v. Not calibrated attenuation, no modulation.
Great fun to get useable, but if you are feeling your way, there are much better options of service signal generators available - Taylor 68, Avo HF135, Leader, Heathkit, and always the Volkswagen of the trade, the Advance E2.
The complete TF1245/TF1246 Qmeter unit is most versatile, but in a different field from servicing radios.
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Old 13th Aug 2020, 9:35 am   #5
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Default Re: Marconi oscillator

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Originally Posted by WME_bill View Post
Marconi TF1247 is the VHF oscillator, covering 20 to 300Mhz. It operates at quite high power, and at very low impedance. You would have to make up a simple transformer (1 turn to 20 say on a ferrite ring or core) to step the output up to about 50ohms. And then the output can be varied up to about 4v. Not calibrated attenuation, no modulation.
Great fun to get useable, but if you are feeling your way, there are much better options of service signal generators available - Taylor 68, Avo HF135, Leader, Heathkit, and always the Volkswagen of the trade, the Advance E2.
The complete TF1245/TF1246 Qmeter unit is most versatile, but in a different field from servicing radios.
wme_bill
THANK YOU ! I had a feeling that would be the case, they are on offer for £25 so if anyone wants them, I can pass on details of the seller.
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Old 13th Aug 2020, 4:46 pm   #6
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Default Re: Marconi oscillator

They are very valuable instruments in terms of what they can do for you if you are designing radios or winding your own VHF inductors. This doesn't mean prices are high, just the value of what they can do.

The TF1245 is a dual frequency range instrument and can be used with a different model oscillator to cover the LF-HF bands. (One oscillator bolts on each side of the 'circuit magnification meter')

Look up Q meter to see what this thing is.

By the way, the bit of coax linking the two is rather special stuff.

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