[Milsurplus] CMS spy set

[Michael A. Bittner]

To Dennis and Al Klase, thanks for all the neat and very helpful pics of the rcvr, and Dennis, thanks the other information that I requested.  The mechanical drawings for constructing the set are coming along nicely.

More items for anyone on the list who may wish to comment::

One thing that is bothering me is the apparent lack of a ground connection.  I don't see one on the rcvr or xmtr, and there seems to be no mention of it in the instructions. With all the emphasis on matching antenna impedance, there must be a ground connection somewhere?
 
Also, no mention of a T/R switch.  I guess the set is meant for separate rcv and xmit antennas or hand switchover of a single antenna for rcv and xmit.  It seems to me that neither of these options are compatible with the suggested use of this set for shore-to-ship communications during landing assault and re-supply missions, although the hand switchover method makes sense for quick one-time use during spy missions, i.e., receive, send, pack up and move out before the DF-ers find you.

Although it doesn't say so in the instructions I assume that in order xmit voice, a key must be plugged in with its shorting bar shorted, and the mic. must have a mic-switch in series with the mic element.  Does this sound correct?

Mike, W6MAB
  ----- Original Message ----- 
  From: Dennis Monticelli 
  To: Michael A. Bittner 
  Sent: Friday, December 12, 2014 7:54 PM
  Subject: Re: CMS spy set


  Hi Mike,


  Good to hear back from you.  That's a great project and I'm interested in how it turns out.


  Here is the info you seek:
  1)   R1 is 1M so you made a good guess.
  2)   I have only one of the original transmitter coils.  The dimensions are 1.5" in dia for the coil winding portion of the form.  The total length of the form is 2.25", which includes the lip on both top and bottom.
  3)  The suitcase dimensions are 13 7/8 x 11 13/16 x 4 7/16.  It is finished naturally but worn off in places on my set (photo attached).   
  4)   The receiver coil size is indeed 5/8" dia.  The length is 1.5".  (photos attached)
  5)   FYI.  The receiver panel dimensions are 6 1/8 x 5 1/4 while the receiver box outer dimensions are 6 3/8 x 5 1/2 x 2 1/4.  The transmitter box is the same size.


  Dennis AE6C