[Milsurplus] Unknown Collins Audio box

[w8au at sssnet.com]

At 12:03 PM 10/14/2014, Doug Hensley wrote:

>Can anyone identify or provide any clues as to what this went to, 
>came out ofor otherwise might be useful to ?
>http://www.w5jv.com/Staged_for_Identifying/Collins_Unk_Audio_Module_Set/
>The lower three modules sport the familiar Collins audio naming habit.

This item is a commercial telephone termination used in carrier or 
microwave baseband systems.  It has a hybrid
that converts a two-wire telephone to a four-wire (separate send and 
receive channels) input and output. The adjustable
line amps set the receive and transmit levels on the carrier 
system.  Typical carrier channel levels (on analog systems)
are +7 dBm output and -16dBm input at 600 ohms.

About the only ham radio use would be as a phone patch, but amateur 
phone patches do this much simpler.

Perry   w8au