[ARC5] Crystals Update

[WA5CAB at cs.com]

I discovered that I had a sorta Rosetta Stone (in the form of SIG 5 
including SIG 5-1) for at least some of the crystal holders.

DC-n are the earliest.
FT-n came next and superceded some DC-n numbers.
CR-n/U came last and many consist of FT-241 or FT-243 holders marked for 
and containing crystals cut for specific radios or radio sets.  

("n" may be one, two or three digits.)

DC-10, listed only as 4495 KC, is for BC-( )-230 and DC-( )-430.  
Description says that the metal prongs with hooks at ends are for attaching to a 
coil.  Does not say what it was used for.

CR-4/U is FT-241 holder marked for and containing crystals cut for 
AN/TRC-1.



In a message dated 7/17/2009 7:27:52 PM Central Daylight Time, 
wh7hg.hi at gmail.com writes: 
> Okay, so anyway … I now have a bunch of FT-241 &FT-243 crystal
> holders (both wartime but with prewar parentage) as well as another
> bunch of blanks to fit FT-243 holders.  Thanks to the good offices of
> two of our number, I also have some mystery holders, specifically some
> CR-4*/Us and a DC-10.  The CR-4*/U holders look like FT-241s but are
> for something that operates in the frequency range of at least 70-90
> MCs.  The DC-10 holder is about the size of an FT-241 but rather than
> having pins it has two flat ears sticking out opposite sides that
> appear to be intended for something like screw-type binding posts.
> This one has a crystal for 4495 KCs.  If anyone has any idea what
> these holders are for, I’d love to know what they are.  Oh, and the
> multiplier train for the CR-4*/Us as well.  That would be nice.
> 
> A few holders I would like to have haven’t yet made an appearance,
> holders like a few of the various round ones.   (Some of the squarish
> ones are coming in next month.)  Being clever and outrageously
> talented, I may have enough information to get creative with casting
> resin and 3/32” brass sheet for some of them and some larger squarish
> ones made using the ones inbound as masters.  While I’m casting I can
> adapt them to the FT-243 blanks I have which would make things
> terribly convenient.
> 
> Freepatentsonline.com is my friend and has been for a long time.  This
> time, they coughed up a bodacious bunch of crystal holders and mounts
> with publication dates from 1927 to 1945 (actually a bit later since
> the applications were made during the war and the grants didn’t happen
> until a few years after) with a few of them of high interest.  Among
> other things I found some interesting holders that accepted the
> crystals and pressure plates as replaceable units plus the patents for
> the FT-171, FT-243 and a few others plus their predecessors.
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480