Many years ago, I tuned up a set of 220Mhz homebrew duplexers with a 5Mhz scope. I built a 50 ohm load into an aluminum mini-box and placed a diode inside the box near the load. I then used the scope to detect the voltage developed by the diode as the power increased or decreased. This was a very crude way of tuning the duplexer, but it did work. Those were the fun days when you really didn't know you were doing things the wrong way, but you still could make things work. I remember driving 5 miles from my house and being able to key up the repeater with my Midland 13-509. I was ecstatic! Oh, for the simpler days of Midland repeaters and Hamtronics controllers. You wonder how we ever talked to anyone on those crappy repeaters.
73, Joe, K1ike Steve Bosshard (NU5D) wrote: > This would not be your typical audio frequency or 20 Mhz vertical > bandwidth scope, I suppose, I have used a Bearcat programmable radio > scanner and an FM10 for a generator to tune pass and reject. Steve NU5D > > > jistabout wrote: >
