Hi The “normal” FRK-L is the low phase noise version of the FRK. There are two “external control” options. One is a 10K pot the other is a EFC voltage. Simple answer is to short the wires / leave them open.
The big deal is finding out if the beast still locks and how much signal is getting to the photo diode. Bob > On Sep 21, 2021, at 7:50 PM, Walter Shawlee 2 <walt...@sphere.bc.ca> wrote: > > I just stripped one of these units out of an Argo Systems AS-210 to use as a > stand alone reference. > The system ran before I did this, so I was sure all the hardware was working. > It is marked FRK-L (manual says this the low temp operating version), and says > Efratom p/n 2A5A2A. I did not see any data in the factory manual for what > this might mean, > but it has the coax 10MHz, and pins for #2-9 connections. > > My issue is that this has wires attached to pins 8 and 9, the *optional > remote frequency adjustment. > The label says "Unit Wired For Operation With External Frequency Control". > *This is discussed *nowhere* in the 79 page manual, and I have no idea what > to do with these connections. > the option is listed as a possible one, but nothing further is said, and no > connections to it show up anywhere. > > Any information is very welcome, as I would like to make a back up Rb > standard for my bench and this > looks like a great candidate if I can get it running. > > Also, from a waste heat viewpoint, the supply range is 22-32VDC, the > schematics discuss an internal +17VDC bus, > so am i correct in thinking that a well regulated +22-24VDC supply is better > than a +28VDC one in terms of waste heat (and shortened life)? > > many thanks, > walter > > Walter Shawlee 2 > Sphere Research Corp. 3394 Sunnyside Rd. > West Kelowna, BC, V1Z 2V4 CANADA > Phone: +1 (250-769-1834 -:- http://www.sphere.bc.ca > +We're all in one boat, no matter how it looks to you. (WS2) > +All you need is love. (John Lennon) > +But, that doesn't mean other things don't come in handy. (WS2) > +Nature is trying very hard to make us succeed, but nature does not depend on > us. > We are not the only experiment. (R. Buckminster Fuller) > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.