Re: [time-nuts] 5 MHz Frequency Doubler

Hi, Have a look at, http://www.wenzel.com/pdffiles/diodedbl.pdf Also http://www.wenzel.com/documents/hints.htm indicates that the NIST design uses JFET's but I can't find any more details. Robert G8RPI. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of

Re: [time-nuts] 5 MHz Frequency Doubler

Robert Atkinson wrote: Hi, Have a look at, http://www.wenzel.com/pdffiles/diodedbl.pdf Also http://www.wenzel.com/documents/hints.htm indicates that the NIST design uses JFET's but I can't find any more details. Robert G8RPI. -Original Message- From: [EMAIL PROTECTED]

Re: [time-nuts] 5 MHz Frequency Doubler

Christopher Hoover wrote: Hey 'nuts, I'm looking for a good design for a 5 MHz frequency doubler. The Wenzel Blue Tops HF doubler is said to be based on a low phase noise, public-domain NIST design: http://www.bluetops.com/Modules/lnhd.htm

[time-nuts] Suggestion: Collect circuit designs/measurement setups at www.febo.com/time-nuts wiki

I set up a wiki at http://www.febo.com/time-nuts quite a while ago with the idea that it might serve as a place to collect various useful bits of information. It really hasn't had any use at all to date. Some of the recent discussions here lead me to suggest that we try to revive the wiki and

[time-nuts] Newly-available app notes (was RE: 5 MHz Frequency Doubler)

Looking at the block diagram, it seems that there is an active noise-cancellation mechanism in place, not just the usual couple of diodes and a transformer. Whatever it is, it takes 30 mA at 15 VDC... Along those lines I recently scanned/OCRed a few app notes by Dieter Scherer and Ron Pratt of

Re: [time-nuts] 5 MHz Frequency Doubler

Hi Christopher: You might have a look at Mini Circuits MK-3, see: http://www.minicircuits.com/MK-3.pdf My guess is that it contains a monolithic bridge diode circuit and a couple of balun transformers. Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java

Re: [time-nuts] 5 MHz Frequency Doubler

On Wed, 25 Oct 2006 23:13:55 -0700, Christopher Hoover [EMAIL PROTECTED] wrote: Hey 'nuts, I'm looking for a good design for a 5 MHz frequency doubler. The Wenzel Blue Tops HF doubler is said to be based on a low phase noise, public-domain NIST design:

Re: [time-nuts] 5 MHz Frequency Doubler

Hi Rex: I think the 4 diode bridge circuit shown on the left of Fig 2 is the Mini Circuits MK-3. Note the fundamental and third harmonic suppression on the MK-3. http://www.minicircuits.com/MK-3.pdf Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java

Re: [time-nuts] 5 MHz Frequency Doubler

For what my 2 cents are worth. I've used the Wenzel design diode based multiplier many times and have had very good results with regards to close-in as well as far phase noise. A simple schematic of my circuit application can be found at:

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

In message: [EMAIL PROTECTED] Dr Bruce Griffiths [EMAIL PROTECTED] writes: : But the input voltage noise of the MAX477 is 5nV/rtHz, the corresponding : value for a discrete transistor circuit may be as low as 1nV/rtHz. rtHz is a new one for me (I'm mostly a software dude). A quick

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

It is read V divided by the square root of Hertz. John - Original Message - From: M. Warner Losh [EMAIL PROTECTED] To: time-nuts@febo.com; [EMAIL PROTECTED] Sent: Thursday, October 26, 2006 1:57 PM Subject: Re: [time-nuts] Comparison of Logic Standards for Clock Distribution In

Re: [time-nuts] 5 MHz Frequency Doubler

Hi Brian: rtHz is Root Hertz. On the newer HP (Agilent) Spectrum Analyzers you can display directly in rtHz, but there is no standard ASCII display character for that so they use xx/Hz where xx is something like uV. So although the display appears to be saying uV per Hertz it's really uV

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

In message: [EMAIL PROTECTED] jmfranke [EMAIL PROTECTED] writes: : It is read V divided by the square root of Hertz. Doh! rt == root. I feel silly now. warner : John : - Original Message - : From: M. Warner Losh [EMAIL PROTECTED] : To: time-nuts@febo.com; [EMAIL

Re: [time-nuts] 5 MHz Frequency Doubler

Brooke Clarke [EMAIL PROTECTED] wrote: rtHz is Root Hertz. On the newer HP (Agilent) Spectrum Analyzers you can display directly in rtHz, but there is no standard ASCII display character for that so they use xx/Hz where xx is something like uV. Ahah! So that's why that funky old nixie

Re: [time-nuts] 5 MHz Frequency Doubler

Hello Brian, nice circuit. Would you have phase noise info, and harmonic/ sub-harmonic measurements for it? Thanks, Said ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Allan deviation - finally some data!!!

It seems obvious that's what hapenned, but I am still curious about the temperature variation. Must have been the coax cables difference in length going to the two inputs. Temperature affected the delay. The resolution of the 5370 is quite amazing. Thanks for the comments and the software.

Re: [time-nuts] 5 MHz Frequency Doubler

Said- I do not have any specific phase noise numbers to offer, but the spectral output is: 5MHz -54dBc 10MHz 0dBc 15MHz -65dBc 20MHz -58dBc 25MHz -70dBc 30MHz -60dBc My application uses the 10MHz output to drive a homebrew direct frequency synthesizer with output in the VHF range, so

Re: [time-nuts] 5 MHz Frequency Doubler

Hi Brian, those numbers look quite impressive! 241GHz, that's almost Infrared :) bye, Said ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts