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M1BYT > TECH 11.08.03 12:37l 42 Lines 1631 Bytes #999 (0) @ WW
BID : 781655M1BYT
Read: DB0FHN GUEST OE7FMI
Subj: Re: Off air lock for ref osc.
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<GB7FCR
Sent: 030811/0947Z @:GB7FCR.#16.GBR.EU #:9247 [Blackpool] FBB-7.03a $:781655M1B
From: M1BYT@GB7FCR.#16.GBR.EU
To : TECH@WW
VK6JY Opined with considerable skill:-
> 2 Line Osc jitter ?
>
> Harry, I think it best to not have the back end of a TV with its line o/p
> trying to lock to incoming syncs, as this is likely to inject jitter into
> into the 15,625 wanted output. The front end of a VCR would have a > tuner and IF, but no heavy
local line pulsing.
I only intended it as a cheap and cheerfull means to provide a very
accurate frequency reference. Before building it, I could never be sure
which of my instruments was telling lies. This purpose it serves
admirably, providing you take account of the short term jitter.
>
> Maybe (probably) the 555 fixes that - not sure. For a 4046 PLL chip this
> conversion to 50% duty cycles should tidy things up - eh Harry?
It might well have been the 4046 which I made use of in my own design.
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º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU º
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º International Museums Weekend 19th+20th June 2004 º
º www.ukradioamateur.org/imw/index.html º
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º The ARC's FL/RAE courses + Newcomers Intro to º
º to amateur radio:- http://www.ukradioamateur.org/ º
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º QTH: Garforth, W. Yorks.. º Timed 09:47 º
º harry.m1byt@tiscali.co.uk º 11 Aug 2003 º
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