Re: [time-nuts] DDS'ery narrow scoped.

IMHO, that would require a sine table with a steerable number of entries. Very problematic for a tunable DDS, but doable for a fixed frequency application, although address mirroring for ROM size reduction would require real address comparators instead just using the 2 MSBs as a selector. The

Re: [time-nuts] DDS'ery

There is an excellent article about cordic on http://www.andraka.com/files/crdcsrvy.pdf There are a lot of other good publications on Ray Andraka's web site. I have published a accurate sine/cosine function on www.opencores.org underhttp://opencores.org/project,sincos It is VHDL

Re: [time-nuts] cordic

So then, it's a trade between a big ROM LUT or a bunch o'gates for CORDIC. And for big N the bunch o'gates is probably going to be easier: 16 bit phase and wanting 16 bits out would be a 64kbit ROM (assuming you didn't do the usual thing of only needing 1/4 cycle).. There is also the

Re: [time-nuts] An (unknown?) nasty feature of the DDS principle for time nuts applications

Don't forget that your HP3325 is DDS-based, too, so it adds its own phase error sawtooth. 73, Gerhard dk4xp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] An (unknown?) nasty feature of the DDS principle for time nuts applications

Don't forget that your HP3325 is DDS-based, too, so it adds its own phase error sawtooth. 73, Gerhard dk4xp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] what is the best way to multiply a 10 Mhz signal?

Von: Stephen Farthing squir...@gmail.com Betreff: [time-nuts] what is the best way to multiply a 10 Mhz signal? I want to multiply the output from my Efratom 101 (10Mhz) to clock a DDS at 70 Mhz. Has anyone tried this? I did 5 MHz * 7 = 35 which is about the same, with CMOS gates and

Re: [time-nuts] New Zealand, Iceland, Haiti

Betreff: Re: [time-nuts] New Zealand, Iceland, Haiti In message 4c8651e7.1080...@att.net, Brooke Clarke writes: All the subject locations are on the edge of the Pacific plate. Iceland ? On the edge of the *Pacific* plate ? Have I missed some serious tektonic activity last night ?

Re: [time-nuts] Phase noise measurement (was - no subject)

Von: Bob Camp li...@rtty.us If you start with a mixer that runs 500 mV / radian (an RPD-1 at the typical 8 mV / degree + 10%) then -180 below that would be 0.5 nV. Since noise it coherent close in, the DSB to SSB process nets you 1 nV out when you have -180 dbc noise. Adding the

Re: [time-nuts] Phase noise measurement (was - no subject)

NXP BF862, available from digi-key. Don't these devices have relatively high flicker noise? 1/f corner is well below 100 Hz. Look at the noise voltage plots of that audio guy I cited. My results for the BF862 were the same shape, absolutely somewhat worse in amplitude because I

Re: [time-nuts] Phase noise measurement (was - no subject)

I think, I'll test some Analog Devices ADA9848-2 in parallel. It's hard to beat that combination of noise, 1/f, bandwidth, offset stability and price. Oooops, ADA4898-2 http://www.analog.com/en/amplifiers-and-comparators/operational-amplifiers-op-amps/ada4898-2/products/product.html

Re: [time-nuts] Phase noise measurement (was - no subject)

Wenzel Audio Amp referred to in this email. Perfect! I drive with it a 3561A and a 7L5! Works for me. The only problem is getting any more 2SK369. Any recommendations? NXP BF862, available from digi-key. I have used it in a similar hookup with good success. Its virtue is the low

Re: [time-nuts] Phase noise measurement (was - no subject)

to drive a +17 dBm mixer, and then amplify the IF output with a low noise current amplifier like the Linear LT1028. You can easily homebrew low noise _voltage_ ? 73, Gerhard dk4xp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

Re: [time-nuts] Notes on the Driscoll VHF Overtone Crystal Oscillator

. (in the same oscillator) That confirms: Close-in to the carrier, the phase noise is dictated by the resonator. [1] 73, Gerhard DK4XP [1] Grant Moulton: Analysis And Prediction Of Phase Noise In Resonators and Oscillators, HP signal analysis division 1985 http://www.hparchive.com/seminar_notes.htm

Re: [time-nuts] Notes on the Driscoll VHF Overtone Crystal Oscillator

at 3 GHz. regards, Gerhard dk4xp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Notes on the Driscoll VHF Overtone Crystal (time-nuts Digest, Vol 65, Issue 114)

, ... regards, Gerhard DK4XP U.L.Rohde/David P. Newkirk: RF/Microwave Circuit Design For Wireless Applications, page 762++ Wiley, ISBN 0-471-29818-2 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] homebrew 13 dBm distribution amplifier based on NIST design 5 to 100 MHz

be accomplished without ferrite or at least with a large air gap. regards, Gerhard dk4xp ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.