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LDG Electronics

1445 Parran Road St. Leonard MD 20685

Phone: 410-586-2177 Fax: 410-586-8475

e-mail: [email protected] http://www.radix.net/~ldg

AT-11 Automatic Antenna Tuner

Assembly Manual

Ver 2.4a

LDG

ELECTRONICS

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Summary of Contents for AT-11

Page 1: ...DG Electronics 1445 Parran Road St Leonard MD 20685 Phone 410 586 2177 Fax 410 586 8475 e mail ldg radix net http www radix net ldg AT 11 Automatic Antenna Tuner Assembly Manual Ver 2 4a LDG ELECTRONICS ...

Page 2: ...omplete we averaged 6 hours on the prototypes Besides the normal building tools needed soldering iron or soldering pencil wire cutters screw drivers ect the only test equipment needed is an HF transceiver dummy load or resonant antenna and voltmeter Before starting you may want to get a copy of the January 1996 QST article where the AT 11 first appeared Although not needed for construction of the ...

Page 3: ...placement Most of the parts are common but a few of them may be new to some builders There are just over 200 parts and 500 solder connections so take your time Once familiar with the parts start with the eight T 106 toroids they are red and just over an inch in diameter Take care to not drop them they will break Use the number 18 gauge wire provided to wind L1 8 For consistency we count one turn w...

Page 4: ...orners are rounded and one corner is square on the oscillator The square corner is pin 1 Next install the tuning capacitors C58 67 Be sure to match the values from the capacitor chart figure 6 Then the electrolytic capacitor C51 on the power input note the polarity Then the power jack Now relays K1 17 can be installed Lastly inductors L1 8 can be installed on the PC board Note that the mounting ho...

Page 5: ...ugh the center of T1 Also bring a ground wire from each SO 239 to the PC board Be sure to scrape the insulation off the ends of the wire before soldering Once everything is mounted and wired U1 the 68HC11 can be placed into the socket and power applied Notice that U1 has a flattened corner that should match the socket On power up the AT 11 will flash all LEDs once to indicate that everything has i...

Page 6: ... tune algorithm but all LEDs will flash once You can use SSB to provide the power for tuning Just press your mic and say something like Ahhhhhh until the AT 11 stops tuning somewhere between 1 and 6 seconds If the tuner has a hard time finding a match or doesn t find 1 5 try using a CW or AM carrier at 10 watts If you reach the upper or lower limit of the inductors or capacitors with the manual pu...

Page 7: ...may be a place or two that your antenna dipole inverted Vee vertical beam ect won t tune Also the farther away from resonance you try to tune the harder time the tuner will have The AT 11 will tune a 10 meter vertical to 80 meters but your performance will not be that great you can t get something for nothing For balanced lines and random wires you may get better performance by using a 4 to 1 or 6...

Page 8: ... welcome e mail ldg radix net is also answered on a daily basis Last Resort As a last resort only LDG Electronics will attempt to repair any problems As much as we would like to do it for free we just can t We have a flat fee of 50 plus parts to repair an AT 11 most resistors and capacitors are included in that fee The 68HC11 chip is the most expensive at 20 The 34064 is 5 Relays are 4 each The 78...

Page 9: ...ut 10 with 68HC11 chip trade in If you purchased the kit from LDG we will notify you when future upgrades and modifications are available trought the AT 11 Newsletter If you purchased the AT 11 through a distributor and would like to be added to our mailing list just drop us a note by mail fax or e mail Feedback We encourage everyone who builds the AT 11 kit to drop us a note card letter or e mail...

Page 10: ...Inches needed 42 32 23 18 12 9 4 2 Fig 4 Inductor Table Fig 1 Block Diagram Inductors Capacitors SWR Sensor Hi Lo Z Switch Input Output 68HC11 Microprocessor LEDs Switches User Interface REV Pwr FWD Pwr Fig 5 T1 10 turns 28 Red1 Green1 Red2 Green2 Fig 2 L1 2 L2 Shown Fig 3 L3 8 L4 Shown Start here Leave 1 ...

Page 11: ...Dn 5 Green 6 Yellow 7 Red 1 8 Red 2 12 Auto 13 Gnd 14 Gnd n c n c 3 5 4 5 1 5 7 0 Top Fig 9 Ribbon Cable Layout Ant TX 18 2 2 25 Chassis Ground 18 2 1 25 Fig 10 Connection between SO 239 and Chassis 10 Tune Fig 6 Capacitor Table Capacitor C54 C55 56 C57 C58 C59 C60 C61 C62 63 pF 5 10 20 40 80 160 320 640 1280 Combination 10 10 10 39 82 150 330 680 680 680 Voltage 500 500 500 500 1 KV 1 KV 1 KV 1 K...

Page 12: ...K 47 1K 47 1K 47 1K 47 1K 47 1K 47 1K 47 4148 1K 47 1K 47 1K 47 1K 47 1K 47 1K 47 1K 47 470 47 82pf 150 151 330 331 680 681 680 681 680 681 68HC11 34064 78L05 01 10uf 100pf 470 470 470 150 3 3K SIP Resistor 100K Pot ...

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Page 15: ... 4 Red 5mm 2 K1 17 SPDT Relay 17 SIP1 10 pin SIP 1 R1 17 1K 1 8w 17 R18 34 47 1 8w 17 R35 150 1 8w 1 R36 45 3 3K 1 8w 2 R37 38 100 1 8w 2 R39 40 10K 1 8w 2 R41 44 470 1 8w 4 VR39 40 100K pots 2 C1 34 37 50 52 53 64 0 01 uf 50V Mono 51 C36 65 100pf 500V or 1KV 2 C51 10 uf 25V or 50V 1 C54 55 56 10 pf 500V 3 C57 39 pf 500V 1 C58 82 pf 500V 1 C59 150pf 1000V 1 C60 330pf 1000V 1 C61 63 680pf 1000V 3 C...

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