Re: [time-nuts] 5 MHz Frequency Doubler (Dr Bruce Griffiths)

2006-10-27 Thread Christopher Hoover
Dr Bruce Griffiths wrote: The design is probably a pair of low noise n channel JFETs configured as a push push doubler. Inputs driven in antiphase so that each FET conducts ffor opposite 1/2 cycles with the 2 FET drains connected in parallel. A bypassed trimpot connected between the FET

Re: [time-nuts] 5 MHz Frequency Doubler (Dr Bruce Griffiths)

2006-10-27 Thread Dr Bruce Griffiths
Christopher Hoover wrote: Dr Bruce Griffiths wrote: The design is probably a pair of low noise n channel JFETs configured as a push push doubler. Inputs driven in antiphase so that each FET conducts ffor opposite 1/2 cycles with the 2 FET drains connected in parallel. A bypassed

Re: [time-nuts] 5 MHz Frequency Doubler (Dr Bruce Griffiths)

2006-10-27 Thread Dr Bruce Griffiths
Christopher Hoover wrote: Dr Bruce Griffiths wrote: The design is probably a pair of low noise n channel JFETs configured as a push push doubler. Inputs driven in antiphase so that each FET conducts ffor opposite 1/2 cycles with the 2 FET drains connected in parallel. A bypassed

Re: [time-nuts] 5 MHz Frequency Doubler

2006-10-26 Thread Robert Atkinson
Of Christopher Hoover Sent: 26 October 2006 07:14 To: time-nuts@febo.com Subject: [time-nuts] 5 MHz Frequency Doubler 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

2006-10-26 Thread Dr Bruce Griffiths
:[EMAIL PROTECTED] On Behalf Of Christopher Hoover Sent: 26 October 2006 07:14 To: time-nuts@febo.com Subject: [time-nuts] 5 MHz Frequency Doubler 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

Re: [time-nuts] 5 MHz Frequency Doubler

2006-10-26 Thread Dr Bruce Griffiths
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

Re: [time-nuts] 5 MHz Frequency Doubler

2006-10-26 Thread Brooke Clarke
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

2006-10-26 Thread Rex
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

2006-10-26 Thread Brooke Clarke
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

2006-10-26 Thread wa1zms
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] 5 MHz Frequency Doubler

2006-10-26 Thread Brooke Clarke
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] 5 MHz Frequency Doubler

2006-10-26 Thread Tim Shoppa
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

2006-10-26 Thread SAIDJACK
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] 5 MHz Frequency Doubler

2006-10-26 Thread wa1zms
-nuts@febo.com Subject: 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

Re: [time-nuts] 5 MHz Frequency Doubler

2006-10-26 Thread SAIDJACK
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