As Bob says you can use an internal or external supply and 10K pot to ground or leave open. With respect to the internal regulator. I think there are two things at startup: the voltage is higher and drops after ignition. So go with the 24V supply about 2 amps should work and to some extent that will drop some generated heat. But most RBs simply have to run hot due to the ovens in them. Add a good heatsink. Suspect the manual says that. Good luck Walter. Paul WB8TSL
On Tue, Sep 21, 2021 at 8:02 PM Bob kb8tq <kb...@n1k.org> wrote: > 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. _______________________________________________ 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.