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Friday, November 15, 2013

Standard Computer Crystals for 17 Meter SSB VXO and IF Filter


Pete Juliano, N6QW, is an electronic  genius.  The ideas in his SPRAT article will be of great use to all those who share in Doug DeMaw's devotion to VXOs and reluctance to spend money.  I'm really tempted to go back and re-do my BITX using Pete's 11.52 MHz computer crystal super-VXO and 4.9152 IF (I could then take my expensive 23.1 MHz crystals and put them back in my Doug DeMaw Barebones Superhet).  I also like Pete's DPDT reed relay crystal switcher too.  Three cheers for Pete Juliano, Doug DeMaw, and SPRAT!  And thanks to WB9FLW for reminding us of Pete's articles.

Hi Bill,
 
Your BITX17 really has me fired up! I came across an interested Super VXO by Pete N6QW for use on 17 Meters.

He uses standard computer xtals (4.9152 MHz for the IF) and (3 - 11.520 MHz freq doubled in the VXO)

This gets you on 18.120 to 18.150 using these two standard xtals.

See Link Below:
 
http://www.jessystems.com/SPRAT%20Article.pdf

http://www.jessystems.com/Images/23%20MHz%20VXO.jpg



Thanks for all your efforts they are much appreciated!!

Best Wishes,
Pete WB9FLW
 


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1 comment:


  1. Hi Bill

    "Nothing new under the sun..."

    VXOs and more importantly diode doublers have been used by VHF and UHF Hams for decades. I built my first diode doubler for an oscillator in 1966 and recently used several in the LO chain for a 24 GHz SSB transceiver.


    The super-VXO circuit is also pushing 35 years old.

    The key word is >experiment< as different crystals need different Ls to pull and still keep crystal Q level stability. VXOs have their own sins like tuning|amplitude|and RX-TX shifting non-linearity.


    In the L-C circuit for pulling 2-4 xtals, we usually avoid a lossy 43 ferrite toroid and use 1 with more Q

    Kind regards

    Emil


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