Skipp, Don't forget the Helper SM-1000 Service Monitor. I owned one for a couple of years, and then upgraded to an IFR FM/AM 1200. My latest monitor is a Motorola R2600D, which I love.
The SM-1000 was a very basic and simple unit that met its claimed accuracy specifications. Perhaps its only drawback was that the oven-stabilized time base was not automatically synchronized with the frequency generating or measuring circuits; you had to manually tweak the CAL knob to zero the error meter before every reading. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025 Sent: Tuesday, December 23, 2008 6:19 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Helper Instruments SM-512 and SM-1024 Hi Randy, You'll be hard pressed to find the Service Manual unless one of the manual sharks (people selling manuals) has one. The only other source I've seen for the manual has been one or two of the SM-512 units I've seen up on Ebay in the last two years. A fairly well thought out basic service monitor. Like most every Helper Product ahead of its time and made with saving the comm tech time and money. Later version was the SM-1024. Helper Instruments was in Florida, growing out of a line of well thought out instruments targeted toward the Two-way radio industry. The owner of Helper passed and his daughter tried to keep things going but was unable to continue with new innovative products that separated Helper from the competition. Sometime later she sold interest in some specific Helper Products to Zetron. After a short time even Zetron discontinued production of their Helper Instruments products. The SM-512 Service monitor (and the later SM-1024) were very special animals (products) not produced or continued by Zetron. The one NY located service center (person) for the SM-512 passed some years back and the legacy of Helper slowly fades into history. I have a fair number of Helper Instrument Products and manuals... but sorry nothing for the SM-512 and SM-1024. cheers, skipp skipp025 at yahoo.com > "wb8art" <wb8...@...> wrote: > > Anyone have a operations manual and or service manual for a Helper > Instruments SM-512? > > Randy
