I have always been interested in trying to improve the look of the 'dead bug' style.
How about a small PCB with an 8 pin DIP connector that is used to mount the oscillator, the divide by 4 and get power, ground and provide 24 MHz and 6 MHz outputs to the 8 pin DIP. That way, the 'little module' plugs into the original socket on the PCB. In addition, if the correct part ever becomes available, it's just 'unplug and play'. Lot's more effort but it sure would look good. Might also allow for some modifications to raise the 24 MHz and achieve smaller phase increment corrections. Likewise, a module could be built to plug into U2 to provide for a 10 MHz VCXO and with jumpers for whatever frequency VCXO you might choose. As designed, the controller is good to 5 MHz or so. Come to think about it, is it time to think about a 21'st century Shera Controller re-design? Or has the TBolt made that obsolete? Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Sunday, May 13, 2012 9:08 PM To: [email protected]; Time-Nuts Subject: Re: [time-nuts] Shera Controller - U7 A 74AC74 in SO-14 package mounted dead bug style will make a handy /4 that is no bigger than most crystal oscillators. If that's still too big, you can go with the TSSOP, but no coffee for you for a week prior to soldering that baby :) Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: "Kevin Staley" <[email protected]> Sender: [email protected] Date: Sun, 13 May 2012 17:27:20 To: 'Discussion of precise time and frequency measurement'<[email protected]> Reply-To: [email protected], Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Shera Controller - U7 Hi all Thanks for the many responses. It would seem that U7 is pretty rare. I think I will be going with a 24 MHz "Can oscillator" and a separate 6MHz source for the PIC either divided from the 24MHz oscillator or a separate oscillator. Thanks again Kevin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Albertson Sent: 13 May 2012 16:47 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Shera Controller - U7 On Sun, May 13, 2012 at 8:11 AM, J. L. Trantham <[email protected]> wrote: > It is an 8 pin DIP, 24 MHz oscillator with an onboard divide output in > order to provide a dual output oscillator. It is an ECS-300CX-240 and > DigiKey lists it as obsolete since 2009. They say 'call'. Sounds like a you could use a normal 24MHz TTL can oscillator and a dual flip flop mounted "dead bug" style. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
