Indeed. I was just pointing out that high-Q approaches might not always
works as you would think, but there is a way around it if you need.
Cheers,
Magnus
On 11/19/2014 02:17 AM, Bob Camp wrote:
Hi
For the limited temperature swings that most labs have, and the sort of ADEV
that the OCXO has, a Q up to 10 can be tolerated pretty well. Keeping the parts
count down to two to four coils and a few capacitors lets you do it without a
lot of complex design tools. They did it with charts and slide rules back in
the 1940’s. You can do it with a few clicks on a web based calculator app these
days.
Bob
On Nov 18, 2014, at 8:10 PM, Magnus Danielson <[email protected]>
wrote:
Hi,
The low Q values has the benefit of being very phase stable.
Low Q dips can be put in to null out particular overtones, LCR-series loading
the signal to ground at suitable place. Also very traditional 1930-1950 era.
Cheers,
Magnus
On 11/19/2014 01:30 AM, Bob Camp 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.
_______________________________________________
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.
