I recently modified my TM-V7a so that I could decode CTCSS and use it as a remote base. The images below show my modifications. Unlike the TM-G707, there are separate mute lines for VHF and UHF. These operate in the same manner as the mute line described on the Repeater-Builder website for the TM-G707. (The position of the volume control matters)
http://groovin.net/ke4pjw/TM-V7a/V7-full.jpg http://groovin.net/ke4pjw/TM-V7a/V7-closeup.jpg http://groovin.net/ke4pjw/TM-V7a/IMG_5468.JPG In this configuration, I am only able to use the UHF portion of the radio. However, I believe two diodes can be used to create an OR gate so that both lines can be used to drive the inverter/buffer circuit. The caveat to that configuration is that the unused band can cause the receiver to open. You would have to set it to a CTCSS that is unlikely to open the receiver. Hope someone else find this information useful. Regards, Terry Trapp KE4PJW
