The Radio Information Board

Hi all, I have two Vx-3000 and I would like to make a simplex remote. the UHF is a newer one and the lowband is older and dosent do alpha tags. Has anyone ever made an interface using the 9 pin plugs on the back to do this and would share the pin outs please(with any added parts)?.. thank you for your help. Davie n 3 c h u at atlanticbb dot net

I have them mounted and transmitting but still havent figured out how to get audio out of the 9 pin plug?. Hope I dont have to resort to using speaker audio and puting it into the front mic plug. Any ideas thanks . Davie