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

Bob Camp kb8tq at n1k.org
Tue Nov 18 19:30:10 EST 2014


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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