[NJARC] TRF radio?

[Jim Whartenby]

Greetings Dave
Look at the tubes and check the type numbers against a tube manual.  If
no manual is available, check them against Bill Beech's web site:

http://www.nj7p.org/Tube.php

If you find a tube described as a "pentagrid converter", you have a
superhetrodyne.  If not, it is either a TRF, Regenerative or
Super-regenerative.

Check the tuning capacitor.  If it has only one section, the set is
most likely a Regenerative.  If there are two or three sections, it is
most likely a Superhetrodyne.  If the tuning capacitor has more then
three sections, it is most likely a TRF.

Look closely at the tuning capacitor.  If one section has fewer or
smaller plates then the other(s), then it is most likely a
superhetrodyne.  If all plates are the same in size and number, then it
can be a TRF.

You can also check out the Wikipedia at: 

http://en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

for descriptions of all of these configurations.  Anyone can contribute
to Wikipedia so there is a chance some information is bogus but it is a
good source of information in a pinch.

Welcome to the Club,
Jim

--- Mstang6T5 at aol.com wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi all,
>  
> I'm a novice member who needs to tap into the NJARC knowledge  base.
> What is 
> a TRF radio? What type of tubes do they use? And  what may be the
> current draw 
> on the tubes?   I'm  currently looking at an Airline battery set, the
> owner 
> thinks it maybe a "TRF  radio" but is not sure. Thanks for the help.
> And have a 
> Happy New year!
>  
> Dave LeMay :-)
> 
> 
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