Hi Mike, Best I can find out it is called a service monitor, hence SM in model no.. Has Sinadder function as well as monitor RX and signal generator and modulator, deviation, and off frequency detector meter.
Randy --- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ <wa6...@...> wrote: > > At 04:06 PM 12/22/08, you wrote: > >Anyone have a operations manual and or service manual for a Helper > >Instruments SM-512 > > > >Randy > > Is that a Sinadder, an RG voltmeter, or another type of equipment? >
