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Summary of Contents for LDG QRP
- Page 1 QRP Automatic Antenna Tuner Assembly Manual Ver 2.0c LDG 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...
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Page 2: Building The Kit
(dipole, vertical, beam, ect). It can be optimized to work with balanced line fed antennas (and random wires) with a 4 to 1 or 6 to 1 balun (not provided). Tuning time of the QRP version has been improved to between 0.1 and 3.0 seconds with an average time of 1.5 seconds. - Page 3 QST, 225 Main St., Newington CT 06111. We've included the charts and tables from the article (modified for the QRP version) needed to build the kit in this manual. Before getting the soldering iron out, go through all of the parts in the kit and familiarize yourself with each component and its placement.
- Page 4 tuning capacitors, C25-34. Be sure to match the values from the capacitor chart (figure 6). The SIP resistor pack can also be installed. Be sure to note the orientation of the SIP resistor (the tuner will not work if it is installed backwards).
- Page 5 the SWR or tuning indicators in your installation, but they are there if desired. A ribbon cable is provided to make front panel connections (see figure 8 for wire assignments). Note that when plugged in, the wire should extend away from the microprocessor. The two ground wires (pin 13 and 14) should be connected to the front panel ground wire (see figure 9).
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Page 6: Operation Notes
The software for the QRP version was modified slightly from the original AT-11 to help reduce power consumption. When the tuner is in the semi mode, the processor will go to sleep after it finds a tune. This reduces power consumption by about 20 mA once a match is found. - Page 7 If you reach the upper or lower limit of the inductors or capacitors with the manual fine tune push buttons, the LEDs will flash while the button is pressed. When in the auto mode, if the tuner can not find a better than 3.0 to 1 match, the tuning algorithm will be repeated until power (either RF or +12) is removed or the mode switch is placed in the semi position.
- Page 8 Telephone technical support is available most days from 6 to 9 pm Eastern Standard Time. Replies by FAX are welcome, e-mail 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...
- Page 9 We are continually trying to put more features in the software of the tuner. The current version of the software (QRP 1.0) was locked in with only 4 bytes (out of 512) of code space left. If you have an idea of how the unit can be made better (in software or hardware), please send a description of your upgrade.
- Page 10 Fig.1 Block Diagram Input Output Inductors Sensor Hi/Lo Z-Switch Capacitors 68HC11 Microprocessor User Interface Fig. 3 L5-8. L5 Shown. Fig. 2 L1-L4. L2 Shown. Start here. Leave 1". Fig. 4 Inductor Table Inductor Turns Inches needed L8 Double 10.0 Fig. 5 T1,10 turns #28 7 bottom Green2 R e d 1...
- Page 11 Fig. 8 14 pin Ribbon Cable Layout Fig. 6 Capacitor Table Combination Capacitor pF (+/-5%) Pin 1 1 - Cap Up 2 - Ind Up 3 - Cap Dn 4 - Ind Dn 10+10 C26-27 5 - Green 6 - Yellow 500V 7 - Red 1 8 - Red 2...
- Page 14 QRP Parts List Ver 2.0 List # Part Description L1-8 Iron Toroid T50-2 Ferrite Toroid FT-37-77 Wire #24 Thermeleze Wire #28 Red 8" Wire #28 Green 8" 68HC11A1FN 34064 78L05 4.5 Mhz Crystal Socket1 52 Pin PLCC D1,2,4 1N4148 Q1-17...
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