Amateur Radio - Free and Open Source Software

Official 1934
SHORT WAVE
RADIO MANUAL
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MAXIMUM total cost (assuming NOJunk-box parts): $45.0 1
THE AF CONNECTION
CIACLE 277 0fiI fI£4O(R SlRVIC( CARD
U(;.21D1U NMale R(;'8, 213.214,Qelta 325
UG-21BIU NMaleR(;.8.213.214,Klnls 5 00
99131P1 N N Ma'o! Pin tOt 9913. 9086. 8214
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UG-218/9913
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NMale10 50-239, TeIIoo USA
NFemaletoPl·259. TellonUSA
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Apply power 10 the Commodore
64 and observe the mini-tester . The
TO , RTS . and DTR ind icators
should be lit. All others should be
off. If you do not have a mini-tester,
place the ground lead of a DC '1011­
meter on pin seven of the 0825 and
check for a voltage ofabout + IOVal
pins IWO. four. and 20.
Now , tum offthe Commodore 64.
attach the mini-tester to the device
you wish 10 connect to the computer.
and apply power to the device. If the
RD indicator lights and m. RTS.
and DTR remain off. you can probably
connect the Commodore 10 the
... J device with a straight RS-232 cable.
Simple. high-
.
Figu re 3. PC boa ~dfo il diawamforthdntnfaa. N01a lotof
IfRD remains off andTD comcs on.
you will need a null-modem. RD is
performance old - pan stuffing hut'. on pin three of the 0825 connector.
time shortwave radios!
All of the secrets are
There are many types of nullhere:
the circuit diagrams. Parts List
modems in common use, so consult
parts layout. coil s pectflcauon s. con-
the manual for the device to be construction
details. operation hints . a nd P.rt Description
Cost nected to determine which type you
m u ch more!
Ul MAX235 R$-232 driver/receiver
$25.00
This Is a compilation of s hortwave
(Ul ) $ockellor ut
S 1.00
need . If there is more than one diaconstruction
articles from -Shon wcoe
gram. use the o ne shown for an IBM
Jl Male DB25 with righi-angie header
$ 4.00
Craft -ma~azlnes published In the20's & PC .
30·s. Ir s wall-to-wall "how-to."
J2 cero-eoce connector
$ 3.50
In clu dedare circuitdiagrams. photo -
12-position duat·readout
Now tum off both the computer
graphs. and design secrets of all short-
on 156 mil centers
and the device and connect them via
wave receivers being manufactured In
Printed circuit board (etched)
$10.00 their serial pons. Tum on the device
1934 including some of the most fa - JPl Removabte jumper
S .50 and the computer. as indicated in the
mous: SW-3. tfie SW-5 1hr1ll Box", the JP2 Wire jumper
$ .01 device manual, and auempt to send
deForest KR-I . the Hamm urland
Solder aJ'ld mounting hardware
$ 1.00
"Cornet Pro". and many more.
and receive data between the two ma-
Also Included Is a new chapter show-
chines. (If you are attaching a print-
Ing how you can use transistors to re - I -=====================~~ er, try se nd ing data only .) You
place hard-to-find vacuum tubes. You1l
even see the ci rcuit that wa s lashed
toget her on a table top one n ight using
jun k box parts . a h ai r curler a nd aluga- following the instructions in the manual .
tor clips. Attached to a n antenna
s trung across the base­
Part No. Ducrlptlon Price Summar)'
"SPECIALIST IN RF CONNECTORS AND COAX"
Pl·259/t1SA U ~F
men t ceiling and a 9 volt battery.
eignats started p oppin g
63-822 F'l-259 Te/lon. Ampheool 1.75
Ma'o! Pr>enoI IC. USA made $ _70
83·1Sl'·105O F'l·259 f>henoloc , Amphenol ,69
In like crazy. In a cou p le of
pt·259!ST U~F Ma'o! Sliver Te/lon. USA I SO
minutes an u rgent message
UG-175 Reoocer fOtRG· 58 ,20
from a ship's captain off Se­
UG·176 Reoocer tOtRG·59&MINI8 20
attle over 150 0 miles away
was h eard askIng for a naviga ­
tor to h elp h im through shallow water!
These s mall regen era tive receivers
are extremely simple, but d o they ever
perform! This Is a must book for the
experimenter , the s u rvtvalrst who Is
concerned about basic commu n ication.
shortwave llsteners. ham ra di o operators
who collect old receivers, a nd jus t
about anyone interes ted In old-ume
radio.
Great book! Fun to read! One of t he
best old-time radio books to tum up In
years. Heavtly Illustrated! Order a copy
todayl 8 1/ 2 x II paperback 260 pages
only S IS.70 postpaid!
!'Und;;ii.1iicatTonSl
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Box 12-WG6, Bradley IL 60915 :
send a ropy of Short Wave Radio
I Manual Enclosed Is S IS.70 . Chk. Me. Visa. Send a free cata- I
I log of other books.
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1.io • Cltv 51; Zip iiIoI I
36 73 Amateur Radio . October. 1989
should be able to get your new pon
working without too much trouble by
I have built three ofthcsc interfaces so
far . The first one was installed inside a
Commodore 64 and brought out to an
IBM PC-AT style DB9 connector attached
to the side ofthe computer. I have
used it. at various limes. 10 attach the
computer to a packet TNC, to an IBM
PC, and even to an Apple Lascrwnter
printer running at 9600 baud . (Yes. the
plural of baud is baud!) The second one
is being used by a friend 10 co nnect his
Commodore 128 computer to his laser
primer. I keep the third one o n hand for
use with my Commodore MC. I have
had no problems with any ofthese interfaces.
and they are very easy 10 build . so
warm up that so ldering iron!
Aboul Parts
There's just one hitch : I have checked
several sources and have not yet found
a nyone interest ed in providing the
MAX235 chip in single unit quannues.
It is possible to get ten o r more. however.
Assuming at least ten people will
want to build this project. I will make the
chips avai lable for $25 each. I will also
supply pre-etched circuit boards for S10
each and complete kits for $50. Send a
check or money orde r in U.S. funds to
Mike Kabala KBOCDQ. /44 W. Spring
Strut. Eldridge. /A 52748 . III