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

[Bob Camp]

Hi

Done with some care, they have little or no phase noise impact on a good 5 MHz oscillator. The OCXO manufacturers would do something else if it did. Rip open some oscillators and take a look. It’s as good a use as any for that pile of dead parts sitting under everybody’s bench.

Bob

> On Nov 18, 2014, at 7:51 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> 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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>>> 
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