At 12/7/2006 14:06, you wrote: >Re: how to build a very simple repeater controller > > > How about using good ol' op amps? I like that approach because > > almost the entire basic controller can be implemented using a > > single chip: 2 op amps for hang time & TOT, 2 left for audio > > processing. Add a JFET for squelch audio gating & you're done. > >Well... it's been done already many times. The Hamtronics COR-3 >circuit is one such well thought out animal. Trying to squeeze it >all into one chip package is a noble idea not so easily done. > >You have to really be good with op amps operating near rf to make >the circuit play well. Like the COR-3 circuit mentioned above I >used Norton input op amps because their inputs seem to be easier >to keep under control in high rf locations.
Odd - I've never had that problem on my portapeater control boards (mounted right next to the exciter in the MVP). Bob NO6B
