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HF AUTOMATIC

ANTENNA TUNER

AT-140

INSTRUCTION MANUAL

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Summary of Contents for AT-140

Page 1: ...HF AUTOMATIC ANTENNA TUNER AT 140 INSTRUCTION MANUAL ...

Page 2: ...counterpoise in positions where no one can touch them R WARNING NEVER transmit during internal adjustment This may cause an electric shock NEVER use without a ground connection USE the ground terminal for ground connection The mounting plate is not connected internally Mounting plate Ground terminal DO NOT operate your HF transceiver without running the vessel s engine When the transceiver s power...

Page 3: ... the matching conditions for up to 45 fre quencies Retuning a memorized frequency takes ap proximately 1 second Super capacitor for memory backup Even if the AT 140 is not used for approximately 1 week the built in super capacitor backs up the con tents of the 45 memories Low power tune up The AT 140 emits low output power during tuning This feature reduces the possibility of causing interference ...

Page 4: ...transceiver power supply or cables and hot or RF burning microphones If all 5 above points are followed during the design and installation of your HF system the operator can expect top performance Vessel ground connection The HF system MUST have an adequate RF ground connection Otherwise the overall efficiency of the HF system installation will be reduced Electrolysis electrical shocks and interfe...

Page 5: ...n wire from the single wire output of the tuner to your in sulated backstay This high voltage wire won t break down in wet weather or sunlight Use stainless steel hose clamps to attach the wire to the insulated back stay The tuner is fed with a coaxial and a control cable from the Icom transceiver Check with your dealer regarding antennas and ca bling RDANGER HIGH VOLTAGE NEVER touch the antenna e...

Page 6: ...inches For example if 15 m 49 2 feet is selected for an antenna element length you have no problem in the 1 6 to 25 MHz marine bands range Insulator Backstay operates as a long wire antenna Insulator Whip antenna NOTE Keep antennas as far away from other ob jects as possible especially metal objects In some countries HF transceivers can be used for land mobile operation Ask your Icom Dealer for de...

Page 7: ...or electrolysis Engine block Ship s DC battery ground Electrolysis D D All ground cables from the AT 140 or HF transceiver on your ship should be connected to only one ship s ground DO NOT connect to two or more points Voltage difference between two or more ship s grounds may cause electrolysis DO NOT connect between dissimilar metals where an electric current is present These connections may caus...

Page 8: ... 8 Terminal information for details GND Use the optional OPC 1147 N or assemble a four conductor shielded cable of the desired length using the connector kits supplied with the transceiver and the tuner E Black 13 6 Red STAR White KEY Green KEY Green STAR White 13 6 Red E Black Use the optional OPC 566 1147 N either connector of the AT 140 or the transceiver requires assembly or assemble a four co...

Page 9: ...e into the opening of the crimp on wire terminal Crimp or solder the antenna wire Crimp Solder e Put the crimp on wire terminal star washer and wing nut on the base nut in that order then tighten the wing nut Make sure the base nut is tightened firmly before you tighten the wing nut See the Fig 1 to the right Carefully bend the wire terminal up after you tighten the wing nut See the Fig 2 to the r...

Page 10: ... due to waves could loosen the antenna tuner making if fall causing personal injury q Connect the coaxial cable and the control cable to the AT 140 Control cable Coaxial cable AT 140 Ground Copper strap etc Connect to the ground OPC 412 Supplied w Wrap both the antenna and the control cable con nectors with rubber vulcanizing tape and then wrap electrical tape over the rubber vulcanizing tape to s...

Page 11: ...tart voltage STAR D D When a start voltage less than 1 V is received the AT 140 begins automatic tuning 8 6 4 2 0 Time More than 350 milliseconds Approximately 7 5 V Less than 1 V to start tuning Start voltage V For the Tuner Through function Less than 250 milliseconds Key voltage KEY D D During automatic tuning the AT 140 grounds the key voltage line and the HF transceiver reduces output power 8 ...

Page 12: ...However the Tuner Through function is not available when using the AT 140 with IC M700 TY IC 78 In the IC 78 select the antenna tuner type as AH 4 in initial set mode See the IC 78 instruction manual s page 32 for details IC M710 RT IC M700PRO In the IC M710 RT and IC M700PRO select the an tenna tuner type as AH 3 in initial set mode See the IC M710 RT instruction manual s page 13 or IC M700PRO in...

Page 13: ...m Input power 150 W PEP 100 W continuous Automatic tuning time Approximately 2 to 3 seconds general condition Maximum 15 seconds Approximately 1 second re tuning for a memorized frequency Automatic tuning accuracy SWR 2 0 1 after tuning except for multiples of 1 2 λ Usable pole diameter 32 to 60 mm 1 3 to 2 4 inches All stated specifications are subject to change without notice or obligation Anten...

Page 14: ...y the verti cal element This style is not effective for NVIS communications Better Inverted L This style is a good for NVIS and lon ger communications Best Two wire inverted L This is an even better element style than the one to the left Near Vertical Incidence Skywave This is a radio wave propagation method that provides usable signals in the range between groundwave and skywave distances usually...

Page 15: ...ation distance Style of the antenna element connection versus the strength of the radiation from the D D element The vertical element should be connected at the end of the horizontal element Good Long The distance is longer between the connection of the vertical element and the end of the horizontal element Better Short The distance between the vertical element and the end of the horizontal elemen...

Page 16: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan A 6175H 1EX t Printed in Japan 2002 2013 Icom Inc Printed on recycled paper with soy ink ...

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