I also use the same method though I am partial to IFR 510 FETs as I recall. Heck it just works and has for about 10 years. But that said this is Time-nuts and folks get pretty touchy about lots of things. So though these methods work I do wonder about noise and such. Regards Paul WB8TSL
On Tue, Nov 18, 2014 at 7:30 PM, Bob Camp <[email protected]> wrote: > Hi > > Single stage NPN 2N5179 or 2N918 or 2N2222 or … biased to generate a > collector current that looks like a “raised cosine” (see your 1952 RF > transmitter textbook). Tune the collector to the desired output. Set the Q > to something like 10 or so. Linear “class A” stage after that. Tune the > collector with another Q 3 to 10 tank. Match it to the load with a PI or a > Tee. > > Bob > > > On Nov 18, 2014, at 6:21 PM, Doug Ronald <[email protected]> wrote: > > > > I doubled my Austron 1250A from 5 MHz to 10 MHz with 2 NPNs fed in > push-pull and output in parallel with a tuned circuit. Before buffering it > with an LH0063, I fed the signal through a 10 MHz crystal, purchased at a > local surplus electronics store for $0.95. The 2nd harmonic is about 70 dB > down. > > > > -Doug, AE6SY > > > > -----Original Message----- > > From: time-nuts [mailto:[email protected]] On Behalf Of Bob > Camp > > Sent: Tuesday, November 18, 2014 3:11 PM > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] ks... answers The emails are getting long > > > > HI > > > > Actually there are three different approaches to the “double 5 MHz” > question. > > > > Roughly 99.99% of all doubler / tripler OCXO’s out there do the trick > with a simple single transistor stage and a tuned tank. Follow it up with > a tuned single transistor output amp. Cheap, easy, not very fancy, gets > people mad when mentioned. It works plenty good enough. The basic design > approach dates back to tube based multipliers done in the 1920’s. Just > about any transmitter design textbook from 1930 through 1960 has design > charts and tube based examples. > > > > Bob > > > >> On Nov 18, 2014, at 4:26 PM, paul swed <[email protected]> wrote: > >> > >> Don > >> The two units work together by a buggy cable from what I have heard so > far. > >> The Ref0 is the master that drives stuff it connects to REF1 that > >> disciplines REF0. > >> If GPS goes away or the ref1 it all keeps ticking. This is been teh > >> system design for about 20 years. > >> > >> Many of us have the ref1 only and the internal osc is 5 Mhz so thats > >> why you have seen discussions on multipliers here. Tap the 5 Mhz > >> double it filter it and buffer it. there seem to be 2 schools of > >> thoughts on the process. Balanced mixer or Wenzel. > >> I would have hacked the answer already. But I need to keep my ref1 > >> running so that it ages in. ASI will refund your money if bad. But only > in 30 days. > >> I do like what I see from the KS-... Can never remember the number. > >> Regards > >> Paul > >> WB8TSL > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
