[MRCA] URC-4 Crystals

[B Smith]

The company that I ordered my latest URC-4 crystal was M and H in 
California but they have gone out of business. The URC-4 originally 
used a  large barrel type crystal a CR-24/U that is no longer 
available.
Specifications for military crystals can be found at:
www.euroquartz.co.uk/Portals/0/cr-crystals.pdf
So Look up CR-24/U.

You will probably want to order a crystal with wire  leads: I usually 
order an HC18/U holder. I have installed larger crystals in the URC-4 
for example a crystal in a HC-6 holder where  I soldered leads to the 
pins and rigged it inside the set but wire leads will make it easier, 
it was ugly but worked.    Additonal Holder info at:
http://www.jancrystals.com/chart.html

Your best best is to  order from International Crystal and talk with 
the Amateur Radio  Sales lady, she has an excellent data base - - - 
tell her you want a crystal made to CR-24/U specs  for the URC-4 radio 
but in a different holder.
http://www.icmfg.com/

Also  Jan Crystals  can supply crystals to military specifications, 
you would ask for a crystal made to CR-24/U  specs but in a different 
holder. They probably do not have anything in their data base on the 
radio.
http://www.jancrystals.com/

JAN Crystals is cheaper than International. International will get you 
closer to frequency however in the URC-4 application of  using  a 
multiplication factor of 4, if the crystal is 1 Kcs off then the final 
two meter frequency will be 4 Kcs off which  on AM probably will not 
make that much difference and is "close enough for Government work".

Order your crystal with wire leads for soldering. There is plenty of 
room inside the URC-4 to install the crystal.
http://www.jancrystals.com/chart.html

"dats  bout all I know bout crystals"

Z