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The MTR-5B
Five band Mountain topper
Five Band Mountain Topper - KD1JV Designs
KD1JV Designs
Manufactured by LNR Precision, Inc. www.LNRprecision.com
steve.kd1jv@gmail.com
Manual Revision 12-12-15
revised 12-12-15
(shown with optional enclosure sold by LnR Precision, production kits use white backlight display)
Features:
Switch selected 40/30/20/17/15 meter bands
(no band modules to lose or change out)
Wide operating voltage range, 6 to 12 volts
15 ma Rx current at 12V supply
Efficient transmitter. Low current with 4W output
LCD display
Push button or Optional rotary tuning
24 hour clock built in, with battery back up
Three 63 character programmable message memories
Message beacon mode with adjustable pause time
Small size: can fit into a 4" x 3" x 3/4" box
MTR-5B Page -1-
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Summary of Contents for LNR Mountain Topper MTR-5B
- Page 1 Manufactured by LNR Precision, Inc. www.LNRprecision.com steve.kd1jv@gmail.com Manual Revision 12-12-15 revised 12-12-15 (shown with optional enclosure sold by LnR Precision, production kits use white backlight display) Features: Switch selected 40/30/20/17/15 meter bands (no band modules to lose or change out)
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Page 2: Operating Instructions
Operating Instructions: Band Selection: Bands are selected with 2 sets of three- position slide switches. The three switches must be in the same position for the rig to work properly. The band switches on the left select the 40 and 30 meter bands. When set to the right- most position, the second set of band switches are enabled: 20m, 17m and 15 meter bands. - Page 3 Fn (Menu) Functions: - Morse frequency annunciation (optional) - Change Keyer speed - Direct Frequency entry - keyer Memory entry - Tune - Set time - Config - Turn on/off options and store configuration Morse Frequency Annunciation This function can be turned ON or OFF in the CONFIG menu. Default is OFF. ●...
- Page 4 Message entry [ENTER MSG] Line 1 – blanks. Will display decoded Morse characters as entered. Line 2 – blank Line 3 – ENTER MSG Line 4 – EXIT CK RE BS (Switch function labels) Message count may use up to 63 characters (including word spaces) and there can be three unique posts. Word spaces are automatically inserted after a word-space pause of ‘7 dot’...
- Page 5 ● Enter the current time + 1 minute (24 hour format) using the paddle: hours, then minutes. Leading zero must be entered if the time is before 10:00am. ● Tap <LD> (DOWN Arrow) to load the time and exit. ● Tap <RE>...
- Page 6 Assembly: ● The work area should be reasonably clean and uncluttered. Good lighting is a must. ● Empty the packets containing the parts into a small bowl for this will ensure the parts will not be lost. Some builders like to assembly over a cookie sheet as the lip around the edge helps to keep parts from going far.
- Page 7 Construction: Reference photos of assembled board MTR-5B Page -7-...
- Page 8 MTR-5B Page -8-...
- Page 9 Parts list: QTY Resistors QTY Capacitors 51 ohms 5% 0805 3.3 pfd GRN/GRN 50V C0G 2% 0805 271 ohms 5% 0805 22 pfd RED/RED 50V C0G 5% 0805 470 ohms 5% 0805 33 pfd ORG/ORG 50V C0G 5% 0805 2.2 K 5% 0805 47 pfd YEL/VOL...
- Page 10 Using the parts placement guides: The parts placement guides on the following pages are color coded to show the location of the various types of parts. Parts to be installed are highlighted in various colors to help identify their locations. The guides are scaled so that the writing on them is easy to see on a computer monitor and come out crisper after the conversion to pdf.
- Page 11 Part locations with values. Capacitors are highlighted in light Blue (101 = 100 pfd, 103 = 10,000 pfd = 0.01 ufd) Resistors are highlighted in yellow Inductors are highlighted in Orange Through-hole and semiconductors are highlighted in gray. MTR-5B Page -11-...
- Page 12 Semiconductor placement ● Finding Pin 1. Some of the ICs used in this kit have a dot or indentation at Pin 1 corner of the chip. For others, the Pin 1 locations isn't as obvious. The manufactures logo is sometimes used (as is the case for U1 and U3) or sometimes there is a line along the Pin 1 end of the chip.
- Page 13 Semiconductor locations: Semiconductors are mounted first. Hand soldering notes: ● First mount U8 (AD9834) followed by U9 (430G2433). Use the straight edge hint on page 12 to line up the pins on the pads. ● Soldering U11, the 60 MHz clock, will be a little tricky since there is not much of a lead sticking out the side of the part.
- Page 14 Resistors: Resistors used in more than one location are shown color coded on the diagram to make it easier to find where they are placed. The parts themselves are not color coded. Be careful not to mix up R18 and R19 since they differ only by the last digit. By the same token 222 and 223 along with 103 and 104 value could be easy to mix up too, so read the numbers carefully.
- Page 15 Capacitors: The paper strips holding the chip caps are color coded to identify their value. The color coding is the same as used for through-hole resistors but instead of ohms it represents picofarads. Therefore, a .01 ufd cap (10,000 pfd) is color coded Brown/Black/Orange. Values of less than 100 pfd are coded with just the two digit colors. 22 pfd is Red/Red.
- Page 16 Top side SMT components: Since there aren't many SMT parts on top side, only one diagram will be used for all of them. Notes: L7: L7 is a power inductor which is a little tricky to solder in place due to the minimal solder tabs sticking out the bottom.
- Page 17 Through-hole components: Install the bottom side through-hole parts first, with the exception of the battery holder since the ● holder sits above the pads for the push button TACK switches. Depending on the type of enclosure the board in mounted, the builder may elect not to install the two ●...
- Page 18 Toroid winding data: Wind the wire snug to the core. A sloppy and loose winding will result in poor power output and an ● increase in spurious emissions. ● After winding, arrange the wire so that the turns are as evenly spaced as possible. ●...
- Page 19 Fix a defect on board: An open VIA was discovered which needs to be fixed with a short piece of magnet wire. Use the least amount of exposed tinned lead as possible to make the connections. This fix connects the output side of the 40 meter receiver band pass filter to the selector switch.
- Page 20 Alignment: Use a 9 volt transistor radio battery to power up the board for the first time. If there are any ● problems, the 9V radio battery can't deliver enough current to do any serious damage. Power up the board and the display should come on. Everything should be functional but the BFO trimmer ●...
- Page 21 Receiver input tuning and transmitter testing: While peaking the receiver input by ear and using off air signals, the receiver inputs are best peaked by using a signal generator and oscilloscope. If neither are available, use another transmitter for the signal generator and a PC sound card Oscilloscope or PSK program.
- Page 22 Packaging the board: The diagram below can be used as a drill template, but before using--it confirm that it printed to actual size using a ruler and checking the dimensions of the red board outline. An “off the shelf” enclosure could be used, or you can make one yourself. One option is to make the front panel and back side from a sheet of aluminum and the rest of the box made out of thin wood.
- Page 23 RX Schematic: MTR-5B Page -23-...
- Page 24 Filters: MTR-5B Page -24-...
- Page 25 CPU/DDS/TX MTR-5B Page -25-...
- Page 26 MTR-5B Page -26-...
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