[ARC5] What is this?

[D C _Mac_ Macdonald]

VHF Command Transmitter.  A replacement for SCR-522 equipment.  100-156 MC, IIRC. 
R-28/ARC-5 is matching receiver. 
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 

 
> Date: Mon, 1 Jun 2015 18:19:38 -0400
> From: mark.k3msb at gmail.com
> To: arc5 at mailman.qth.net
> Subject: [ARC5] What is this?
> 
> ebay 371340228361
> 
> 73 Mark K3MSB