KD1JV Designs Mountain Topper Manual
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KD1JV Designs Mountain Topper Manual

Two band rig
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Specifications:
Dual band, 20 M and 40 M typical, 30 M and 80 M possible.
Receiver:
MDS: ~0.2 uV
Small signal band width ~ 500 Hz
Audio output limited to ~ 800 mv p-p
Headphone output, 16 ohms min recommended.
Minimum current (no signal) ~35 ma
Transmitter:
2.5 watts @ 9 volt supply typical
Spurs -50 dBc or better

Table of Contents

Assembly:..........................................................2
Check out and Calibration:.............................12
Calibration:............................................12
adjustment:.............................................13
Receiver input peaking:.........................13
filter adjustment:....................................13
Mounting into an enclosure. ...........................16
Basic operation:...............................................17
Turning the rig on and off:.........................17
Volume control: .........................................17
Band selection:...........................................17
Control switches:........................................17
Frequency tuning: ......................................18
Tuning limits: ........................................18
SPLIT MODES:.........................................18
MENU:.......................................................18
1
The Mountain Topper
A very small, very efficient, two band rig
KD1JV Designs
http://kd1jv.qrpradio.com
steve.kd1jv@gmail.com
By
Quick selections: .......................................18
DFE Mode: ...........................................19
Tune Mode: ...........................................19
Battery Voltage:.....................................19
Frequency readout: ....................................19
M: Keyer Memory entry: .....................20
Sending messages: ................................20
D: Digital Mode.....................................21
P: Program user preferences..................21
Straight key mode:.....................................21
Operating voltages: ...................................21
HIGH SWR CAUTION: ......................21
Digital modes:............................................24
Running Pocketdigi:...................................24
Calibration:.................................................24

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Summary of Contents for KD1JV Designs Mountain Topper

  • Page 1: Table Of Contents

    The Mountain Topper A very small, very efficient, two band rig KD1JV Designs http://kd1jv.qrpradio.com steve.kd1jv@gmail.com Specifications: Dual band, 20 M and 40 M typical, 30 M and 80 M possible. Receiver: MDS: ~0.2 uV Small signal band width ~ 500 Hz Audio output limited to ~ 800 mv p-p Headphone output, 16 ohms min recommended.

  • Page 2: Assembly

    Assembly: Your work area should be reasonably clean and uncluttered. Good lighting is a must. ● Empty the packets containing the parts into small paper bowls. This will ensure that they do not get lost. Some ● people like to do the assembly over a cookie sheet, as the lip around the edge helps to keep parts from going far. The metal sheet also provides some measure of static control, especially if you ground it.
  • Page 3 Some parts do not have values marked on them or are very hard to read. Capacitors are not marked so these have been color coded with a marker on the part carrier. This color matches the color shown on the location guides. SOT-23 parts have numbers printed on them, but are very hard to read.
  • Page 4 Component location diagrams There wasn't enough space between components on the circuit board to put component designations next to most of the chip resistors and caps. Use the diagrams below to locate a part with its designation number. Note: Slide switches can be mounted on either the top or bottom of the board.
  • Page 5 Parts list: QTY Part number Color code or location/description QTY Value Color code Location(s) value # or value # SA612A U1, U3 MIXER LM4808M U2 AUDIO AMP R10, R16, R18 TC1014-3.3VCT713 BROWN U4 3.3V REG R2, R31 to R38 A5xx (last 2.2 K R26, R27 characters...
  • Page 6 Semiconductor placement Finding Pin 1. Some of the ICs used in this kit have a dot or indentation at ● the 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 7 Resistors : Bottom ● Since part designation numbers for most parts are not printed on the board, you will need to use the diagram to locate where the part goes. Pay careful attention to where the part is located to be sure it doesn't go where a cap will go later. Resistor locations are highlighted in yellow.
  • Page 8 Capacitors : Bottom Capacitors part carriers are color coded as the part its self has no markings to identify its value directly. Install all the capacitors of a given value before starting to install another value. This will prevent mixing up values. Several values are indicated by two colors, a main solid color and a second color stripe.
  • Page 9 Capacitor / Resistors : TOP Value/color location #places Orange* 1 (20M- 22p) Black* 1 (40M- 68p) C33, 43, 67 Blue C17, 48 Blue/red R31 to R38 R23, R24 1402 Orange L1, L9 *Note: C65 and C66 values for 40/20 band combo.
  • Page 10 Through hole parts: ● (use your normal solder {.02 or /.032} for most of these parts) X1 – X5 tack solder case of X1,2, 3 and 4 to the pad along the top edge of the board. A little blob of solder in between X1-X2 and X3-X4 will do.
  • Page 11 Missing connection fix: A jumper must be connected between the top of R14 and R13 as shown the following picture and diagram. A capacitor lead clipping can be used for the jumper. Adding this jumper connects 5V to R14 and R19, which should have been connected to the via to the right of the top of R14.

  • Page 12: Check Out And Calibration

    Check out and Calibration: lean the board of any flux residue. This will help in inspecting all the solder connections. “Electrical Parts Cleaner”, available at most commercial electrical parts suppliers works well to remove flux. Denatured alcohol will also work. Avoid rubbing alcohol, as this leaves a white residue.

  • Page 13: Local Oscillator Frequency Trim And Bfo Adjustment

    reference oscillator pins. Also check the soldering to the DDS chip. Local Oscillator frequency trim and BFO adjustment: This is used to trim the LO frequency to exactly match the center response of the IF crystal filter. This will ensure the best sensitivity of the receiver.
  • Page 14 Troubleshooting: With careful assembly, the MTR should power up and work great the first time power is applied. But we all know that sometimes doesn't happen and you'll have to figure out why. In nearly all cases, any problem can be tracked down to soldering issues, usually missing connections. On occasion, the connection can look good as there is solder there, but it did not stick to the pad under the part.
  • Page 15 Voltage charts: 1.4V RFIN 5.0V 2.5V 5.0V 1.4V RFIN 4.3V 2.5V 2.5V 4.9V 2.5V 2.5V 3.9V 3.9V 2.5V U1/U3 SA612 mixer oscillator U2 LM4808 audio amp gain gain 2.2V Audio in P6 3.5V Control 5.0V ST in 2.2V Audio out 2.5V U9 Analog SPDT switch U5 LM386 audio amp...

  • Page 16: Mounting Into An Enclosure

    The phone and power jack can't be located quite far enough down from the lip of the tin so that the lid will close. A small notch in the lip of the lid will have to be made with a round file to make clearance for the mounting nuts for the jacks. The Mountain topper MENU...

  • Page 17: Basic Operation

    When changing bands after initial power up, the last used frequency for that band will be loaded. ● Control switches: Four push button switches control the ● operation of the Mountain Topper. All switches have multiple functions. ● The primary function of each switch is labeled in red in the switch function flow diagram shown to the right.

  • Page 18: Frequency Tuning

    Frequency tuning: The operating frequency of the rig is controlled by the TUNE UP and TUNE DOWN buttons. These are labeled on the front panel with an up arrow and down arrow, respectively. “Clicking” the appropriate switch will increment or decrement the current frequency by 50 Hz.

  • Page 19: Dfe Mode

    <RIT> = DFE (direct frequency entry) ● <Tune Down> = Tune Mode ● <Tune Up> = Battery Voltage ● DFE Mode: “DFE” is annunciated when mode is activated, [ - ] is displayed on LED This mode allows you to enter a desired operating frequency using the paddle. This can be any frequency within the upper and lower band edges currently in use.

  • Page 20: M: Keyer Memory Entry

    approximatively 1 wpm increment using the paddle. Click and hold closed the MENU switch until the letter “S” is annunciated and appears on the 7 segment display, ● then release the switch. This mode will automatically exit after 1 second if no action has taken place in that time. ●...

  • Page 21: D: Digital Mode

    D: Digital Mode “d” on the display This mode allows the transmission of PSK, RTTY or CW using a connection to a PC sound card (desktop, laptop or PDA) running the “Pocketdigi” program by OK1IAK. The use of this mode is explained in detail at the end of this manual. Click <MENU>...
  • Page 22 Schematics Receiver section:...
  • Page 23 CPU / TRANSMITTER Sections:...

  • Page 24: Digital Modes

    Digital modes: The MTR can transmit a number of digital modes using a programmed called “Pocketdigi” written by Vojtech, OK1IAK. You will find this program in the folder named “Pocketdigi” on the CD supplied with the kit. Pocketdigi communicates with the rig using the sound card of a PC or other device capable of running the program (anything with a Windows operating system).
  • Page 25 until it does. The sound level should be set a little above the minimum needed to get the response from the rig. If you do not get the annunciation even with the volume turned all the way up, then there is likely a problem with the interface board.
  • Page 26 $utctime - Universal Coordinated Time. $date - Local date. $utcdate - UTC date. $call - Other parties call sign taken from QSO data. $band - Band taken from QSO data. $rxrst - Received RST taken from QSO data. $txrst - Transmitted RST taken from QSO data. $name - Other parties name taken from QSO data.

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