Motorola F2265A User Manual Download

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ATU

HF-SSB Automatic Antenna Tuner

1.6-30 MHz, 125 W

Owner’s Manual

68P02948C35-A

Summary of Contents for F2265A

Page 1: ...ATU HF SSB Automatic Antenna Tuner 1 6 30 MHz 125 W Owner s Manual 68P02948C35 A ...

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Page 3: ...ATU HF SSB Automatic Antenna Tuner 1 6 30 MHz 125 W Owner s Manual 68P02948C35 A ...

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Page 5: ...CTIONAL DESCRIPTION 1 1 CHAPTER 2 INSTALLATION 2 1 GENERAL 2 1 2 2 RECOMMENDED EQUIPMENT 2 1 2 2 1 Tools 2 1 2 2 2 Accessories 2 1 2 3 MOBILE INSTALLATION INSTRUCTIONS 2 1 2 3 1 Cable Kits 2 1 2 3 2 Installation Instructions 2 1 2 3 3 Operational Check 2 3 2 4 BASE STATION INSTALLATION INSTRUCTIONS 2 4 2 4 1 Antenna Installation 2 4 2 4 2 Antenna Ground Plane 2 5 2 4 3 ATU Installation Instruction...

Page 6: ...peration 3 1 3 2 BLOCK DIAGRAM DESCRIPTION 3 2 3 2 1 RF Matching Network 3 2 3 2 2 RF Sensor 3 2 3 2 3 Tuner Logic 3 2 3 2 4 Latches and Relay Drivers 3 3 3 3 DETAILED CIRCUIT DESCRIPTIONS 3 3 3 3 1 RF Sensor Circuit 3 3 3 3 2 RF Matching Network Circuit 3 4 3 3 3 Tuner Logic Circuit 3 5 3 3 4 Latches And Relay Drivers Circuit 3 6 ...

Page 7: ... any frequency in the 1 6 30 MHz range Number of Memory Channels 4437 Tuning Time Typical 0 5 seconds Maximum 3 seconds From memory less than 300 milliseconds RF Tuning Power 5 7 W Antennas For frequency range 1 6 30 MHz 12 ft 3 7 m to 16 ft 5 m mobile whips 23 ft 7 m to 35 ft 10 8 m base station whips 23 ft 7 m to 60 ft 18 2 m long wire antennas For frequency range 2 30 MHz Same as for 1 6 30 MHz...

Page 8: ...od 510 2 Rain MIL STD 810D Method 506 2 Salt Fog MIL STD 810D Method 509 2 Operating Temperature 30ºC to 60ºC Storage Temperature 40ºC to 85ºC Humidity 90 to 95 50ºC Dimensions H x W x L 14 2 x 3 6 x 9 36 cm x 9 1 cm x 22 9 cm Weight 5 5 lbs 2 5 kg Lead in Length from Antenna to Tuner 1 ft max mobile installation Specifications subject to change without notice ...

Page 9: ...372 Antenna Tuner Board FHN5760 ATU Assembly FKN4314 High Voltage Cable Kit for Use with Mobile Whips FKN4589A RF Coax Cable Kit 17 feet 68P02948C35 ATU HF SSB Automatic Antenna Tuner Owner s Manual ACCESSORIES FKN4612A RF Cable kit 30 feet N Type UHF FKN4613A RF Cable Kit 100 feet N Type UHF v vi Blank ...

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Page 11: ...ON The F2265A Automatic Antenna Tuner ATU operates in the 1 6 to 30 MHz frequency range at 125 watts peak envelope power PEP The ATU automatically selects the network component for the antenna matching thus eliminating the need for programming presetting manual tuning and adjustment during the installation and the operations A microprocessor circuit checks the antenna matching each time the channe...

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Page 13: ...allation 2 3 2 1 Antenna and ATU Location The antenna and ATU locations on a vehicle are the most critical parts of a mobile installation since they have a great influence on the effective radiated power 2 3 2 1 1 Antenna Location The ATU tunes mobile whip antennas as specified in the PERFORMANCE SPECIFICATIONS section However 15 foot whip is recommended for best efficiency For short range communi...

Page 14: ...tenna ATU Interconnections 2 3 2 2 1 Whips Longer than 16 ft and Wire Antennas Step 1 Connect the ATU output connector to the antenna connector with the shortest wire possible A 12 AWG insulated wire is sufficient for this purpose The lead in wire should have about 3 of clearance from metal walls grounding braids etc You may use the FKN4314A High Voltage Cable Kit supplied with the ATU Step 2 Conn...

Page 15: ...unding braid does not provide a good ground to the vehicle s body connect the supplied grounding wire between the ATU ground terminal and a good grounding point near the antenna base using the supplied tapping screw and split washer Step 5 Attach the other end of the high voltage cable to the antenna base 2 3 2 3 Cable Interconnections Step 1 Route the RF cable between the ATU and the radio Step 2...

Page 16: ...ed in one of the following configurations inverted L and sloping wire as illustrated in Figure 2 5 and Figure 2 6 The antennas illustrated in these figures are suitable for systems using frequencies below 5 MHz Optimum antenna performance is achieved when the antenna is approximately a quarter of a wavelength long see footnote below Figure 2 5 Inverted L Antenna Figure 2 6 Sloping Wire Antenna If ...

Page 17: ...nd Plane for Wire Antennas non roof mounted Twelve radials 35 to 60 feet long will form a good ground plane A ground rod should be driven into the ground close to the antenna base to provide a lightning discharge pass The ground plane shape for an Inverted L wire antenna should be distorted with most of the surface area placed under the antenna see Figure 2 8 The sloping wire antenna should have a...

Page 18: ...al Use mechanical strain relief similar to the one shown in Figure 2 10 Step 4 Connect the shortest possible ground lead between the antenna ground plane and ATU ground terminal The base station ground ATU ground and the antenna ground plane must be bond to the earth ground CAUTION Do not install the ATU without the earth ground The earth ground is required both for the ATU efficient operation and...

Page 19: ...he ATU captures a 20ms sample of the signal The sample signal frequency is divided by 128 and measured by a counter Based on the above data the frequency measurement resolution is as follows Resolution Hz 6400 128 ms 20 1 The ATU reads the tuning data corresponding to the measured frequency from its internal memory such data exists if tuning was previously performed for this frequency The ATU sets...

Page 20: ...nd PH C signals indicate whether the load is inductive or capacitive Vg signal indicates on which G circle on the Smith Chart the load is located G R 1 Vf signal indicates the forward power Vr signal indicates the reverse power An RF sample for calculating the signal frequency 3 2 3 TUNER LOGIC The Tuner Logic circuit performs the following functions Detects channel change in the radio based on DC...

Page 21: ... circle in the Smith Chart forward power and reverse power respectively 3 3 1 1 Phase Sensor The phase sensor measures the phase difference between the input signal voltage and the input signal current A capacitor network made up of C204 C203 and C184 samples the voltage The voltage sample is applied to pin 6 of the T101 phase sensing transformer and is thus added to the current sample generated i...

Page 22: ... Tuner Logic circuit for the G circle indication see paragraph 3 3 3 2 3 3 1 4 Frequency Sample Capacitors C200 C211 and C212 sample the RF signal during the tuning process Sampling is enabled for a duration of 20 milliseconds under control for the Tuner Logic circuit The sample signal FREQ is passed to the Tuner Logic circuit During sampling 12 Vdc is supplied to the cathode of pin diode CR108 vi...

Page 23: ...whenever possible Cmed value ranges between 0 pF and 275 pF in 4 steps under control of two relays K114 K115 In addition Cmed allows tuning inductive loads when the series capacitor C100 C110 is not sufficient 3 3 2 6 Bypass Relay K112 The bypass relay K112 is used to bypass output relays K101 through K104 when all of these four relays are closed inductors L101 through L104 are shorted This techni...

Page 24: ...Vf Vhigh the tuning request is rejected and the ATU is bypassed Determining the load characteristics if PH C PH L the load is capacitive if PH L PH C the load is inductive 3 3 3 3 Shorting the Sensor Outputs After the tuning process is completed the Tuner Logic circuit shorts the signal lines from the sensors to a ground to protect the logic circuits and the sensor components from high power durin...

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