HF AUTOMATIC
ANTENNA TUNER
AT-141
INSTRUCTION MANUAL
Page 1: ...HF AUTOMATIC ANTENNA TUNER AT 141 INSTRUCTION MANUAL ...
Page 2: ...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 Ground terminal Mounting plate DO NOT operate your HF transceiver without running the vessel s engine When the transceiver s power is ON and your vessel s e...
Page 3: ...y stores 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 141 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 141 emits low output power during tuning This feature reduces the possibility of causing inter...
Page 4: ...in the 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 ...
Page 5: ... in 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...
Page 6: ...NOT use an antenna element such as mul tiples of 1 2λ lengths half wavelength since tuning becomes difficult L Undesirable antenna element length m f Operating frequency MHz n Natural number n 1 2 3 L 300 f 1 2 n Example At an operating frequency of 16 MHz avoid the fol lowing antenna element lengths L 300 16 1 2 n 9 4 18 8 For example if 15 m is selected for an antenna ele ment length you have no...
Page 7: ... noise or electrolysis Engine block Ship s DC battery ground Electrolysis D D All ground cables from the AT 141 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 m...
Page 8: ...shield line to the GND terminal on the transceiver Icom offers an optional OPC 1465 control cable Length 10 m Refer to page 8 Terminal information for details Control cable D When connecting to an Icom transceiver GND To the AT 141 ANTC Black 13 6 Red STAR White KEY Green Use the optional OPC 1465 or assemble a four conductor shielded cable of the desired length using the connector kits supplied w...
Page 9: ...weatherproof cap and finally the antenna wire to prevent water seeping Wrap electrical tape over the rubber vulcanizing tape to secure waterproofing The electrical tape is not supplied with the AT 141 Fig 2 Insulator e t r Rubber vulcanizing tape Bend this part up AFTER you tighten the wing nut CAUTION If you skip the following steps moisture will get into the connector and this could damage the a...
Page 10: ...the antenna and control cable re ceptacles This may cause disconnection in side the AT 141 internal connector damage or a bad connection r Connect the coaxial cable and the control cable to the transceiver as shown below t Ground the transceiver AT 141 and shield cable of the control cable via the ground terminal See pages 1 2 and 4 for grounding details IMPORTANT NEVER ground the AT 141 via the m...
Page 11: ...STAR 13 6 ANTC Start voltage STAR D D When a start voltage less than 1 V is received the AT 141 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 tuner through operation Less than 250 milliseconds Key voltage KEY D D During automatic tuning the AT 141 grounds the key voltage line and the HF transceiver reduces ou...
Page 12: ...he HF transceiver Current drain Maximum 2 A Operating temperature range 30 C to 60 C Weight approximately 2 5 kg Antenna connector SO 239 50 Ω Maximum Input power 150 W PEP 100 W continuous Automatic tuning time Approximately 2 to 3 seconds general condition Maximum 15 seconds Approximately 1 second retuning for a memorized frequency Automatic tuning accuracy SWR 2 0 1 after tuning except for mult...
Page 13: ... Antenna tuner Vertical element Horizontal element Good High position This antenna tuner unit position is bet ter than others but the length of the ver tical element is shorter than the others Better Mid position This installation is also good Best Low position This installation is perfect for the length of the vertical element and the total ele ment length RDANGER HIGH VOLTAGE NEVER touch the ant...
Page 14: ...strength of radiation from the antenna element D D When the antenna tuner is installed on the deck the following installation may be possible The antenna element should be as long as possible especially for the HF low band such as the 8 MHz marine band Antenna tuner location versus the strength of radiation from the same length of the D D antenna element When the antenna tuner is installed on the ...
Page 15: ... element D D The thickness of the antenna element does not change communication quality much but it should be as thick as possible for better radiation from the antenna element Good Regular size Better Thick Best Thicker RDANGER HIGH VOLTAGE NEVER touch the antenna element while tuning or transmitting ...
Page 16: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan A 6472H 1EU r Printed in Japan 2005 2013 Icom Inc Printed on recycled paper with soy ink ...
