~—7h ! R7
                                                          
I enose the Intersil IM52nO rPLt because I hove oecess to a machine for
prosramnlng lt. Other FPLt ould be used. as could a 12exe P0M, rlsure 3
is the cedlnx sheet for the lM5200~ lt lS der~ved trot FlQur~ 2, 1f you don~t
nave ~ machlno tO proqram IM520Q~s and tint to duplteate ~Y teyer~ you car
buy the $MS200 pte-proGrammed suamlttlng rlQure 3 witn your order,

Clock

The cloek clrcultrY uses two declmal rag multlpliers, These are driven by tSi
l aster referenee. and prowlde between 0 •nd 99 outDut pu;~es for every
100 lnPut Dulses, Two thUmbwheel ~tltehes Drogrom the rate multlplrers,

A feature of rzte multlpliers is thot thelr outPut pulses are not •venly
sTacedw but have an rz Wiltter," HoweverS we dsvlde the rate ~ultlPller outDuf
frequeNCY by 12,00n, Thls reduees the jttter tO •n ltpereeptlble level anC
provldes an frequeney of SN/6 HZ, where N tr the number set ln the thumbwheel
swltewas MN/6 HZ equals M words Per minute,

Th eYer tS fotpZtlble tith cOherEnt CEX jUst s@t the thU~bwheel s~itchies
eo 12 wom, and drive the teyer clock from tt.ie station master reference
osetx lator, But the weyer may also be used for ordinarY CW operatron~ at other
speeds.

Cotments

$2ve trled thls out ln bretidboard foras~ and it works, t dld lt in TSL first
because I nave a iunkbox full of TTL parts, and everyttilng tras on hiand, Hovev
it would be better, t ttilnk, to do it tr CMOS, when the CHOS parts zrrive~ o
I us ld another one, t~ll take a 9100 ti~ies cloetw output out Of the
dtvlder chatn and use It to drive tne 100 X CloCK erca. Ptn t n the Pet
Pnrb lter tcOwN 76t74|.

                                                         J1D K7KK