Hams in Space!

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I., ''C-,,"'e p RQ-S? sc . ..... . ". GR,-On, AUTO- KAU OK_ " 0' ''' DECODER J" 33 • CuP Jwl l ' 'N " 'OOU : PRO-S' ,C'''''ER " 00"'C01 '0>< $ sv f '" ,+, ~CED PIED P~ LED i § 'f' 1 CR2 ••• 14 R1 CR J1 15 R2 CR5 16 U1 ~~ U. 00 3 rd : N 4th , Remove R4 -1JR4 U4 o ... VRl ••••••• J2 U2 u z-eeee out +0 pin4 'S C21l~ on " . '" ' D " ~ O S .[5 .... J " J 3 IR, "' OvEI "' ---x-- - '" lAOO, -C;:, lN2221. "' Cl36' Figure 2. PRO~57Jcanne r modifications. Figure 3. Scan control modifications combine the logic of both the decoder and the scanner. ~ SA RA ~'::; Figure 4. AK-4 modifications {circuit board details). 32 73Amateur Radio Today · March, 1991 I " o • '" ,"'6 ",,,"- "'~ ' ·P"ONO J AC- REAR VIEW SNAKER -jJ(8 1P6 G3 I" ,. t I,." ~Q~ '"' -t- se RS MC MO CU CO '-rn • I rXT,R"'L- SR' A' ," ~, ""O NO J AC_ FOR se'" CONTROl , , ~: ./ • ., -' }....! ~ P~ , \ .~ ., ) .~ \ .' .~) other is used to add an external speaker jack to the scanner. This provides a way to feed audio 10 the decoder and to control the speaker line with the decoder. To add the miniphono jacks, drill two \4 " holes on the side of the chassis, just below the speaker. Wirin~ the Scan Control Jack You don't have to remove the PRO-57's circuit boards. You do have 10 use anti-static precautions. Be sure 10 discharge any static electricity on your body by touch ing a ground before working on the circuit board. There is a short jumper wire about Y:z" long in the center of the main board, labeled JW33. One side of JW33 goes to the squelch control, pin 13 of IC2, R73 and R70 (surface mounted on bottom ofboard). The other side ofJW33 goes to IC4 pin 62. Clip this jumper in the middle and raise each side off the board. Solder wires abou t 5" long to each side of the cut j umper. Solder the wire that goes to IC4 (the side closest of ClIO) to the "lip" connection on the scan control mini-phono jack. Solder the other wire (nearest D14) to the switch section ofthe jack. Connecting the scan control through the switch section will cause the scanner to operate normally when the decoder is unplugged. Connect a wire from the ground lugs of both the scan control and speakers jacks to TP6, the PCB ground. wir ing the External Speaker Jack Unsolder the white wire going to the speaker's positive side . Wire this 10 the "tip" lug on the external speakerjack. Wire the switch lug 10 the positive lug of the speaker with a short piece of wire. Decoder l\l odi fication The Auto-Kall AK-4 is well-suited for this project because it has two independent timers. You need one timer to stop the scanner for a short time, 5~ 10 seconds, upon receipt of the first digit. You need a second 6 U 0 • • N o "' VR' ~~;:J:~UP,R. mo" C6 ""
, • ALlNCO'S DR·590T DUAL BAND TRANSCEIVER IS THE ONLY HAM TRANSCEIVER THAT CAN TURN YOUR DTMF-CAPABLE* HANDY TALKY INTO A45/35 WATT HAND-HELD POWER HOUSEl .ALlNCO'S DR-590T CAN BE FULLY CONTROLLED BY A DTMF CAPABLE HAND-HELD FROM A REMOTE LOCATION ! THAT'S RIGHT, WITH YOUR HT YOU CAN CROSS BAND REPEAT, CHANGE FREQUENCIES, MOVE UP AND DOWN THE MEMORY CHANNELS, ETC" ETC" ETC. • WORKING FROM YOUR HAND HELD THRU ALlNCO'S DR-590T MEANS YOU CAN REACH AND WORK ALL REPEATERS WITHIN THE 45/35 WAIT RANGE - DIRECTLY FROM YOUR HT, WITHOUT RETURNING TO THE DR-590T! .SEE YOUR NEAREST AUTHORIZED ALiNCO DEALER FOR DETAILS AND A FULL DEMONSTRATION! • SUCH AS THE NEW ALiNCO OJ560 TWIN- BAND HIT. STAY TUNED TO ALINCO FOR MORE INNOVATION, QUALITY AND VALUE! ALINCO ELECTRONICS INC. 438 Amapola Ave., Unit 130. Torrance, CA 90501 , U.S.A. • (213) 618-8616 • FAX: (213) 618·8758 CIRCU 67 ON READER S£RVlCl CARD
Page 1 and 2: I • • Hams in Space!
Page 3 and 4: MFJ, Bencher and Curtis team up to
Page 5 and 6: THETEAM PUBLISHER/EDITOR Wayne Gree
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Page 10 and 11: • • The SAHEX STS-37 Mission Th
Page 12 and 13: telemetry on one side and Fuji-OSCA
Page 14 and 15: Number 5 on your Feed~c:knrc! Weath
Page 16 and 17: f7 ,.. '0 ' ''~, " ~H~ '~" '" " LT(
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Page 23 and 24: Number 7 on your FHdback card Eleme
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Page 37 and 38: , REMEMBER...A LOW COST POWER PACK
Page 39 and 40: z o ; ? « D April 26, 27, 28, 19
Page 41 and 42: tuning is common, and can be elimin
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CHIL.E Robert M. Wright X06EK Casil
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Number 27 on your Feedback card DEA
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0J • How 10 WOn< Ihe Competition
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