[time-nuts] Ugly Frequency Dividers

[Robert Atkinson]

Hi,
Sounds like someone made a solid state Decatron,
See http://mypage.bluewin.ch/sagnell/id14.htm

Robert G8RPI.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Normand Martel
Sent: 09 August 2006 00:12
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Ugly Frequency Dividers

That remembers me the ugliest (or most exotic?)
frequency divider i ever saw:

It was part of a Marconi (damn, i don't remember the
model number, but it was an OOOOOLD model), more
precisely the 600 MHz divide by ten prescaler.

The input divider was based on two tunnel diodes that
acted as a div. by two divider followed by the really
most bizarre divide by five unit i ever saw: Fifteen
discrete NPN transistors arranged in a star (or
pentagon (Helloooo Echelon!! ) ) topology with the
input placed at the center of the star. The 15
transistor were in a symmetrical loop of 5 three
transistor units working in a closed loop.

Years later, i've made searches to find the schematic
of this prescaler, but without the model number, this
is quasi-impossible.

If one of this forum's members has this schematic, i
would be pleased to ask for a copy!

Damn! That strange "star" all-transistor divider could
count up to 300 MHz after all!!!

Have a good day gang and keep this forum running!!

73 de Normand Martel VE2UM
Montreal, Quebec, Canada

--- Randy Warner <Randy at synergy-gps.com> wrote:

>  Tom,
> 
> Attached is my entry in the butt-ugly PPS divider
> contest. A whole lot
> of 74HC192's and 74HC74's. I think this is circa
> 1999 or so. 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Tom Van Baak
> Sent: Tuesday, August 08, 2006 2:16 PM
> To: Discussion of precise time and frequency
> measurement
> Subject: Re: [time-nuts] Frequency Dividers
> 
> Let me add this photo - I found in a box my first
> attempt to make a PPS
> divider as well as an early breadboard prototype of
> the much simpler,
> PIC-based, divider.
> 
> http://www.leapsecond.com/pages/ppsdiv/ver1.jpg
> 
> /tvb
> 
> 
> 
> _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com
>
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com
>
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

_______________________________________________
time-nuts mailing list
time-nuts at febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts 
Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600.


The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving the Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party.