I am in the process of building a new telemetry board for my Auxiliary Link/remote base system and repeater. I have some ideas on what I want to accomplish but, I would welcome some input from others while I am in the design stage of this project.

The circuit board will contain telemetry feedback for the four major remote status conditions, and probably some additional feedback for other ancillary functions. There are fifteen such functions, all on/off, nothing variable. I have though considered the addition of variables, such as pan left, or pan right. Tilt up, tilt down etc. The four main functions are: Administrator access, User Group access, Auxiliary B status, and Telephone Autopatch. There will be a voltage to frequency converter that will provide an "S" meter feedback in the form of a progressively lower tone to higher frequency audio tone, proportionate to signal strength as seen by the 6 Meter receiver. There will be an audio synthesized voice chip to repeat announcements, and it will also contain a few sound effects to indicate certain happenstance's on the 6 Meter repeater. An example would be such as a "time-out" condition.

What I am wondering about though is, what things I might design onto this board while I am at it. The board will be primarily analog in design. I will use Op-Amp Comparitors for the Carrier Operated Relay functions, and PNP/NPN transistor switching circuits to turn on, or turn off various intermediary functions. I design mostly with Op-amps, 555 or 556 timers, and discreet transistors because, thats what I'm use to dealing with and I know their switching and current handling abilities.

So, any thoughts on what I might add? Please give suggested IC part numbers along with circuit ideas, and any critical interface conditions, such as CMOS, TTL, Current Mirrors with split power supplies etc. Anything I use will get honorable mention as to the originator of the ideas. Send your e-mails to techbench@geocities.com.