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II SELECTOR<br />
MAGNET S<br />
}<br />
4'OA 9:<br />
112'11' ~ IN4 73!S<br />
68.1\. -r-. ..... ~~NER INPUT<br />
Barker &<br />
Williamson<br />
Co nclu sions<br />
KEY ING CIRCUIT CONNECTION<br />
Fig. 3. Keying circuit connection.<br />
This AFSK unit represents an ad van ce<br />
over many other d esigs wh ich hav e be en<br />
off ered. Its free dom from keying transien ts<br />
and harmonic gen eration should help clea n<br />
up so me of th e signals heard on the band<br />
prese nt ly. The prese ntation o f a design fo r<br />
the lower to ne pair should allow use wi th<br />
many tran smitters with out mo d ifica tion.<br />
Econom y semiconductors an d integra ted<br />
circuits arc used, and th e cos t of bu ilding<br />
the un it wi th all new par ts should be about<br />
$10 . Certainly a clean signal is wo rth that!<br />
If you like yo ur circuits "ready printed,"<br />
you can send a $2.50 check to American<br />
Phot o "Et ch Co. , Box 2627 , South San<br />
Francisco CA 94 08 0 . If you'd rather do<br />
your ow n, check the bo ard and co mponent<br />
layouts in Figs. 4 a nd 5.<br />
R ef e ren ces<br />
l, Alulio F requency-Shift Keying for<br />
RTTY, IrvinlIo{{, Q ST : J u n e, 1965<br />
2. Harris Company, 56 E. [..lain St.,<br />
'Forringt on CT.<br />
3. Elliol B I/c h ana n Assoc., 1U67 Monaana<br />
Blvd. , O ah /all d CA.<br />
...WB4FMP-<br />
Now Offering<br />
Waters Protaxr«<br />
COAXIAL<br />
SWITCHES<br />
WITH AUTO MATIC GRO UNDING<br />
. . automatically grounds entire<br />
antenna system when the rig is<br />
not in use!<br />
MODE L<br />
375<br />
6-Position<br />
rear-mounted<br />
(axial connectors)<br />
MODEL<br />
376<br />
5-Position<br />
side -mo u nted<br />
(radial connectors)<br />
VIBROPLEX<br />
ENJOY EASY,<br />
RESTFUL KEYING<br />
$21.95 to $43 .95<br />
THE YIBROPLEX<br />
CO" INC.<br />
833 Broadwav .<br />
New York, ~ Y 10003<br />
VHF-UHF<br />
CRYSTAL CONTROLLED<br />
CONVERTERS<br />
iHodel432C.i1 - $ 6 4 .9 5 ...<br />
Availabl e f o r 50 l h rough 4 32 MHz · Sil icon<br />
F ET Ci rcuitry. S ilv e r Plated Ci rcu ilS • Built-in<br />
ac P o w e r S u p p ly. Wr it e for d eta iled Data<br />
JANEL Shee ts Or o rder d ,reCl , sp ecifyin g i·f f requenc y .<br />
P,O . B ox 1 12. S "cc~, unn a, NJ 0 78 76<br />
LABORATOR I ES Te lepi,one 20 1-584·652 1<br />
Precision built by B & W to the same<br />
standards that escalat ed our coaxia l<br />
switch line to its pre sent envi abl e<br />
position in th e field .<br />
@g;lii)<br />
Barker &<br />
F · Williamson<br />
Incorporated<br />
CANA L ST., BR ISTOL, PA. 19007<br />
See your local dealer or write dep t. D for<br />
descrip tive literature.<br />
FEBRUARY 1971<br />
25
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