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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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26th Jun 2014, 8:15 pm | #1 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,083
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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. |
27th Jun 2014, 8:38 am | #2 |
Octode
Join Date: Jul 2009
Location: Carmel, Llannerchymedd, Anglesey, UK.
Posts: 1,498
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Re: TRF related question
If we had called it regeneration, the Americans would probably use the term reaction!
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27th Jun 2014, 12:24 pm | #3 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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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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27th Jun 2014, 1:21 pm | #4 |
Retired Dormant Member
Join Date: Dec 2007
Location: St Albans, Hertfordshire, UK.
Posts: 43
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Re: TRF related question
Hello
Also known as Q multiplier,which is exactly waht it does. Doug |
29th Jun 2014, 10:09 pm | #5 |
Heptode
Join Date: Apr 2009
Location: Scratby, Norfolk, UK.
Posts: 648
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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 |