Nothing wrong with a Master II, Micor or MVP Radio. The test case radios I'm using for the poor mans repeater project are Midland Syntech 70-340b units, which cost us $10 each. Last night we put the previously built (by us) cor/cos interface relay (yes we used a relay vs something solid state) circuit into the radios(s). In addition to working as a repeater... this mod in two radios will also function as a bi-directional unit. Since the interface is universal to all the same radios... cross band "port-hole" operation is done by simply plugging two different band radios into the almost stock wire harness.
There are simple provisions to lock the rx radio out from any tx during repeat receive cos/cor active. So we don't experience any repeater pumping during most linking or cross band operation. Mostly the modified radios will serve as receiver only units. The nice part about this conversion is how no mods need to be done to the tx radio. Yep... you read that right... More later on... cheers, skipp ps: I'll send you the information first thing in the morn... > DCFluX <[EMAIL PROTECTED]> wrote: > If cheap is the goal why not just convert a MASTR-II or a Micor? The > last 2 Micors I got were free and I paid $20 each for some Custom > MVPs. Pretty cheap. I'd prefere designing something from the ground > up vs. just converting something into the ham band. > > > > Many receivers used the two mentioned chips... in both commericial, > > Amateur Radio and classic scanner circuits. I've seen both part > > numbers converted to "tk" numbers in Yaesu and Uniden Radios. > > I wanted to do a receiver based on the SA-604 and an external squelch > circuit, but it is still on the projects list and it became hard to > find a off the shelf 21.4MHz IF Quarature coil. > > > > If you really were interested in more work with the mentioned > > chips I can and would be happy to email you some circuit diagrams > > and manuals related to the chips used in quality well engineered > > designs/circuits (in pdf file format). > > I'd like that. > > > As in our poor mans repeater project... sometimes when money is > > tight you try to use whatever you can get you hands on. > > If cheap is the goal why not just convert a MASTR-II or a Micor? The > last 2 Micors I got were free and I paid $20 each for some Custom > MVPs. Pretty cheap. I'd prefere designing something from the ground up > vs. just converting something into the ham band. >
