Re: [time-nuts] Small quantity custom crystals

To ease the requirements on your crystal, you might consider using a diode frequency multiplier to bring your oscillator frequency into that range. Wenzel has a good app note on one variety: http://www.wenzel.com/documents/2diomult.html --n On Thu, 2010-09-30 at 18:57 +, Mark Sims wrote: > I

Re: [time-nuts] Simple PLL chips, gone ?

If you're thinking about using a CPLD to load registers in a PLL chip, why not just implement the PLL on the CPLD? After all, if you're looking for simpler-is-better, there's not much on a dedicated PLL chip that you can't easily replicate in CPLD with some care and attention paid to layout. -

Re: [time-nuts] Low phase noise VCO

t CPLDS from XILINX and ALTERA and has always worked very well for > me in terms of frequency locking range and low phase noise. > > Best regards > Ulrich Bangert > > > -Ursprungliche Nachricht- > > Von: time-nuts-boun...@febo.com > > [mailto:ti

Re: [time-nuts] Low phase noise VCO

> >>> Regards. > >>> > >>> Max. K 4 O D S. > >>> > >>> Email: m...@maxsmusicplace.com > >>> > >>> Transistor site http://www.funwithtransistors.net > >>> Vacuum tube site: http://www.funwithtubes.net > >>> Musi

Re: [time-nuts] Low phase noise VCO

> From: b...@iaxs.net > To: time-nuts@febo.com > Date: Tue, 9 Feb 2010 18:24:39 -0600 > Subject: Re: [time-nuts] Low phase noise VCO > > Which leads me to ask a novice question: > > Why not pull a 16 MHz crystal and multiply to 64 MHz? > > If you count down from 64 to 10 MHz, isn't the multipli

Re: [time-nuts] Low phase noise VCO

> Does it need to be phase coherent with your 10MHz reference, or just > frequency locked? Doesn't need to be coherent right now, but I can think of several reasons why having it phase coherent would be helpful in the future. > Also, If you are using it in a software defined radio, you don'

[time-nuts] Low phase noise VCO

Gentlemen, Not being an oscillator guru, I thought I'd ask here. I'm building up a fixed-frequency 64MHz PLL oscillator which uses a 10MHz reference. The reference is a homebrew HP 10544A-based GPSDO which seems to work OK. I've built a phase comparator based on a CoolRunner-II CPLD which impl

Re: [time-nuts] Test Equipment

Late to the party, I know, but I'd like to put in another recommendation for the DG8SAQ VNA. It's cheap, accurate, and best of all -- SMALL! It occupies 4"x3"x2" and so doesn't take up a whole desk. If 1.3GHz is enough for you, that might be the way to go. You get about 90dB of dynamic range. Y

Re: [time-nuts] HP 10544A with dodgy output?

east one of the transistors of the > differential pair is used in the circuit. > Is the board shown actually the oscillator board or just the buffer board? > > Is your OCXO a 10554 or is it a 10544A? > > Bruce > > Nick Foster wrote: > > Bruce, > > >

Re: [time-nuts] HP 10544A with dodgy output?

> Oscillator transistor base voltage - 2*Vbe. > > Bruce > > Nick Foster wrote: > > Thanks for the quick reply, John. > > > > > >> From: jmfra...@cox.net > >> Okay, 12V on the oscillator (pin 3) and 20V on the oven (pin 14). How much > >&g

Re: [time-nuts] HP 10544A with dodgy output?

re pins 2, 4, 5, 9, and 15 grounded? Pin 6 (EFC) should be grounded for > initial testing. > > John WA4WDL > > -- > From: "Nick Foster" > Sent: Friday, January 15, 2010 2:53 PM > To: > Subject: [time-nuts] HP 1

[time-nuts] HP 10544A with dodgy output?

Hi all, I've just built a GPS-disciplined oscillator built around a 10544A, somewhat in the style of the Brooks Shera unit, just to use around the shack. Problem is, now that it's wired up, I notice the output is heavily distorted. It's clipped on the negative side of the waveform, like an emi