[Milsurplus] [Crystal_Sets] WWI Telefunken Project

[Al Klase]

Gang,

I'm contemplating building an electrical reproduction of the German 
field set at the bottom of this page (my site):
http://www.skywaves.ar88.net/xtal/xtal.htm

On paper this looks like a much better radio than the U.S. Army BC-14 
that we copied from some silly French set.

Consider these points:

- The detector is tapped down on the secondary in the two 
tuned-secondary positions of the right-hand switch.  This should avoid 
the detector killing the Q of the secondary.  I've personally observed 
this as a shortcoming the the BC-14

- The secondary tuning dial is calibrated in wavelength.  This should be 
reasonably accurate with light coupling.

- There is a separate untuned secondary selected by the right-hand 
switch.  This lets one discover a station by just tuning the antenna.

Looks like these guys knew what they were doing.  Assuming the phone 
jacks are on 19 mm centers, the front panel is about 9 x 12 inches.

Does anybody have any info on the detector?  What mineral(s), inside 
view, etc.?

Regards,
Al

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

______________________________________________________________
Crystal_Sets mailing list
Home: http://mailman.qth.net/mailman/listinfo/crystal_sets
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Crystal_Sets at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2196 / Virus Database: 2437/5197 - Release Date: 08/13/12