[GreenKeys] Best TU?

[Bruce Gentry]

Keith Densmore wrote:
> Hello,
> This sounds very interesting but I must confess I am not familiar with 
> exactly what  this is?? Could some kind soul enlighten me??
>
> Thanks,
> Keith VE3TS
>
>  The MD-522 is an American miltary surplus RTTY modem, typically used with the GRC-106 in radio huts that go into the back of a big pickup truck. It is more than just a modem, it also has an audio amp built in that will boost the receive audio to loudspeaker level. It works on audio, not an IF sample, so it can be used with other recivers. It has an internal loop supply and is powered by 24 volts DC.  When you find them, they are often missing the meter and knobs because of radioactive glow-in-the-dark paint paranoia. 
>   

     Bruce