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The Mountain Topper by Steve Weber (KD1JV)
(MTR)
www.LNRprecision.com
FULLY ASSEMBLED – Manufactured by LNR Precision, Inc.
A very small, very efficient three band QRP CW rig.
Specifications:
Three bands, 40M, 30M, 20M
Receiver:
MDS: ~0.2 uV
Small signal band width ~ 500 Hz
Audio output limited to ~ 1200 mv p-p
Headphone output, 16 ohms min recommended.
Transmitter:
2.5 watts @ 9 volt supply typical
Spurs -50 dBc or better
Size: 3.8" x 2.7" x 1" (LWH)
Weight: 4.4 ounces.
Power requirements:
6 volts minimum, 12 volts maximum.
Receive current:
~ 35 ma, no signal.
Transmit current:
~ 400 ma @ 9V, 20M
~ 550 ma @12V, 20M
(transmit current is slightly less on 40 and 30 meters)
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Summary of Contents for LNR Mountain Topper
- Page 1 The Mountain Topper by Steve Weber (KD1JV) (MTR) www.LNRprecision.com FULLY ASSEMBLED – Manufactured by LNR Precision, Inc. A very small, very efficient three band QRP CW rig. Specifications: Three bands, 40M, 30M, 20M Receiver: MDS: ~0.2 uV Small signal band width ~ 500 Hz Audio output limited to ~ 1200 mv p-p Headphone output, 16 ohms min recommended.
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Page 2: Operation
In this case, an in line volume control can be added in series with your headphones. 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 BLACK in the switch function flow diagram shown to the right. - Page 3 front panel with an up arrow and down arrow, respectively. “Clicking” the appropriate switch will increment or decrement the current frequency by 50 Hz. Holding one of the tune switches closed for longer than one (1) second will start an auto-tune mode. The frequency will now change in 100 Hz steps at a rate of about 10 steps a second as long as the switch is held closed.
- Page 4 <RIT> = DFE (direct frequency entry) <Tune Down> = Tune Mode <Tune Up> = Battery Voltage DFE Mode: “DFE” is annunciated when mode is activated a dash, [ - ], 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 5 Frequency readout: Click and then release the <Fn> switch will activate the frequency readout. The default mode of readout is both a numerical readout, sequenced one digit at a time on the LED display, and annunciated in Morse by the side tone. The 100 kHz, 10 kHz, 1 kHz and 100 Hz digits are indicated, in that order. MHz digits are implied by the band in which the rig is currently operating on.
- Page 6 Message 2 is sent by clicking the <Tune Up> switch within 1/2 of a second after releasing the Split switch. Message 3 is sent by clicking the <Fn> switch within 1/2 of a second after releasing the Split switch. Message 1 can also be sent by tapping the DAH paddle Message 2 can also be sent by tapping the DIT paddle Message Pause and...
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Page 7: Straight Key Mode
The DFE mode is used to enter the voltage via the paddle. After the <TUNE UP> switch is pressed the side tone will annunciate “E B V” (enter battery voltage) The current set point voltage will be annunciated by the side tone. This can be used to check the setting if you forgot what it was. - Page 8 DDS Frequency calibration: The DDS frequency has been factory calibrated so there should be no reason to use this function. These calibration procedures are included “just in case” they maybe needed, but should not be attempted unless you have access to an accurate frequency counter and an Oscilloscope. Reference Oscillator Frequency Calibration: NOTE: Entering the calibration mode will rest the reference, offset and initial power on frequencies to their default values.
- Page 9 6. If you tweak the LO frequency, be sure to go back to the headphone jack and reset the BFO frequency to peak in the audio filter. 7. Click the Fn button again to finish the calibration. The rig will reset and restart.
- Page 10 Schematics Receiver section:...
- Page 11 CPU / TRANSMITTER Sections:...
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