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.
