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Old 26th Jun 2014, 8:15 pm   #1
Neil Purling
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Default TRF related question

A old 'ham' I knew once who worked in a radio shop always used the term 'Reaction' when talking about the first radio he made. I realise now that he was talking about a TRF because he said it would squeal if you used too much reaction.

The inventor of the TRF: Edwin H Armstrong was American. The patent dates from 1914, so I wonder what term is used there?
Somehow Americans call it Regeneration and we call it Reaction. I just wondered why.
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Old 27th Jun 2014, 8:38 am   #2
lesmw0sec
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Default Re: TRF related question

If we had called it regeneration, the Americans would probably use the term reaction!
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Old 27th Jun 2014, 12:24 pm   #3
Herald1360
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Default Re: TRF related question

Regeneration is probably more descriptive of the actual process than Reaction. Whatever it's called it's really positive feedback.
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Old 27th Jun 2014, 1:21 pm   #4
rmslt56
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Default Re: TRF related question

Hello
Also known as Q multiplier,which is exactly waht it does.
Doug
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Old 29th Jun 2014, 10:09 pm   #5
Dave757
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Default Re: TRF related question

Hi all

EH Armstrong filed a patent for the regenerative process in 1914, but this
was overturned in favour of Lee de Forest in 1926. TRF receivers do not of
necessity have regeneration, although most do. My Marconi CR200 is a TRF,
but does not have reaction/regeneration, - it is fitted with a BFO.

Kind regards

Dave
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