[time-nuts] ks... answers The emails are getting long

paul swed paulswedb at gmail.com
Tue Nov 18 19:51:13 EST 2014


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 <kb8tq at n1k.org> 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 <doug at dougronald.com> 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:time-nuts-bounces at febo.com] 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 <paulswedb at gmail.com> 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
> >> _______________________________________________
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