It actually is quite simple to control the recent Yaesu radios via the microphone plug. No complex test equipment needed. If I recall correctly, there are 2 lines from the microphone called SW1 and SW2. By applying discrete voltage steps to those 2 lines, all 22 buttons on the keypad are encoded.
I used 8 resistors in a simple dual ladder array and a PIC to emulate the microphone. I should have a truth table somewhere if there is any interest. 73, John Maurer WØDP Ames, Iowa From: DCFluX To: [email protected] Sent: Thursday, November 16, 2006 3:08 PM Subject: Re: [Repeater-Builder] Re: Has anyone interfaced a Yaesu FT-8500 to be a remote base on a repeater? It should be possible to emulate the hand mic and control the radio. You would need some serious test equipment and it may not be worth the effort though. It should also be possible to piggy back a circuit into either the mic or the radio front pannel as well if disecting the protocol is not an option. But you would be flying blind from the controller side of things as there would be no way of knowing what channel you are on except by keeping track of it and hope that no one uses the front panel to get the radio and controller out of sync, this is the approch used by the Doug Hall RBI-1. On 11/16/06, Ken Arck <[EMAIL PROTECTED]> wrote: > > At 11:18 AM 11/16/2006, you wrote: > > >I would say that depends on when the radio was made. Older Yaesu's, > >such as the FT-757 and even the FT-727 had a "CAT" interface which > >allows data from a computer to set the operating parameters of the > >radio. > > > >Other radios in the Yaseu line, Such as the FT-5100 have a few lines > >for the buttons, like band sellect and channel up and down. Which can > >allow 'poor mans remote base'. > > > >Others take a serial data stream down the mic jack to do control of > >the radio. You would have to get a logic analyzer or digital storage > >scope to disect the protocol though. > > > The FT-8500, 8800 and 8900 don't allow for serial commanding of the > radio "on the fly", i.e. no CAT interface. Likewise, serial control > via the mic connector isn't possible either. > > That's not to say that just because a radio doesn't have "CAT" > capabilities that it isn't remotely controllable (as we showed with > Kenwood TM-V7a, g707 and 271A) but Yaesu apparently has a different > line of reasoning :-) > > Ken > ---------------------------------------------------------- > President and CTO - Arcom Communications > Makers of the world famous RC210 Repeater Controller and accessories. > http://www.ah6le.net/arcom/index.html > Authorized Dealers for Kenwood and Telewave and > we offer complete repeater packages! > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > > > > > > Yahoo! Groups Links > > > > >
