[Motorola] Board id- MDC Signalling...

[John Jewkes-W6HNC/AAR0MI OR]

AKA the old days, we called these horn/siren alert
boxes and they rested outside the radio and received
Sub-Audible tones to trigger. Sounds like with the description given 
(25-Pin port) it is likely the transmitter end of the system, in a base
radio or repeater cabinet. The bulk of the Mot mobiles and HT's since 
mid 90's have the horn alert circuits built in, and need only to be 
activated in the software/ribb to operate. (Each mobile/ht or 'group' 
(IE Swat team, etc.) is assigned a specific tone to activate.
73 de John W6HNC/AAR0MI OR

Eric Lemmon wrote:

 > Glenn,
 >
 > The HLN4708B is identified as a "MDC Signalling Circuit Board" on
 > MOL.  The
 > product has been canceled, so I can't find out anything more.
 >
 > 73, Eric Lemmon WB6FLY
 >
 > Glenn Little WB4UIV wrote:
 >
 > > Before I scrap this board can anyone identify it? The board is marked
 > > HLN4708B. It has a microprocessor, a couple of relays and a DB-25
 > connector
 > > as some identifying parts.
 > >
 > > Any help appreciated.
 > >
 > > 73
 > > Glenn
 > > WB4UIV
 > >
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