> n...@... wrote: > ...and everyone thought I was nuts for using a Regency > scanner as a deviation monitor & signal generator. > Bob NO6B
Well, it's not just because of that... Sorry Bob... I couldn't help myself... :-) I myself also tried using the Bearcat, Radio Shack, Uniden and GRE Scanners as rough test equipment... but I could only get relative accuracy at best. The deviation meter indication was not ultra stable or precise but it was kind of neat to look at. Still... when I had a lot more time and not much money (still not much money) they were relatively usable for ham applications. Interesting to learn Helper was able to tame a Bearcat Scanner PLL enough to make it into a viable test instrument. The Bearcat 210 series scanners at the time seemed to have a mondo strong VCO chain/PLL output... easily heard outside the box and (I'm told) was very much fun being possibly used for a short time to jam a nearby grouchy old ham on 2 meters if an outside antennae was used. And you learned not all scanner receiver IF frequencies were 10.7 MHz. Other Neat'o scanner mod tricks I found, tried, and used were the added SSB BFO circuit (and separate detected output), COS/COR logic outputs, buffered discriminator output, external frequency converter & frequency steering logic and low current DC outputs (which I still use to this day). I spent a fair amount of time inside 70's and 80's vintage Radio Shack Scanners to add out of normal frequency range and external rx-converter operation. What often starts life as one type of communications device can often be used for many other functions. And of course many hams in early attempts to construct a repeater hopes his/her scanner receiver will work in the application... only in most cases to be sorely disappointed. Early Radio Shack Scanners were easy to mod because the Service Manuals could be fairly easily obtained. cheers, s. > > At 12/24/2008 12:45, you wrote: > >The SM-512 is a service monitor that covers 1 to 512 MHz if > > memory serves correctly. It has a built in Sinadder and > > Millivolt meter. The system was designed around a Bearcat > > scanner.
