MFJ MFJ-9315W, MFJ-9317W, MFJ-9320W, MFJ-9330W, MFJ-9340W User Manual
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MFJ cub QRP CW Transceiver |
Operation Manual |
INTRODUCTION
Congratulations on purchasing the MFJ cub Transceiver. The cub takes advantage of SMD technology to achieve big-radio performance in a pocketsized package. Whether you're taking a 10-minute DX break from the computer, or backpacking in the mountains, the cub is a great way to put the magic back into ham radio. Here are a few of the features we think you'll appreciate:
Hot Receiver: Pulls in weak QRP signals.
Low Noise: Virtually no noise contribution from receiver electronics.
Sharp Passband: Ladder filter and shaped audio reject unwanted QRM and QRN.
Differential-Mode AGC: Audio output holds steady over 80-dB signal range.
Robust AF Output: 100 mW AF amp drives headphones and speakers with ease.
Adjustable Transmitter: Power output continuously variable for QRP.
Full QSK: Seamless electronic switching for smooth break-in.
Natural Sidetone: Receiver monitors actual on-air signal.
Shaped Keying: Controlled envelope for click-free keying.
Custom Set-up: Transmit offset and receiver passband both user adjustable.
Low Power Drain: Runs from any lightweight regulated power source.
Truly Portable: Set up anywhere and tuck out of the way when not in use.
Simple to Use: Off/on switch, volume control, and tuning knob--that's it!
Attractive: Rugged aluminum case looks good, and it's built to last.
Ergonomic Layout: Controls conveniently positioned.
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MFJ cub QRP CW Transceiver |
Operation Manual |
TYPICAL SPECIFICATIONS
Cub models are available for six popular QRP bands. Typical performance for each is shown in the following table:
|
VFO |
Tuning |
IF Freq |
-6dB |
MDS |
USB |
Power |
Spurs |
Model |
MHz |
kHz |
MHz |
Selectivity |
Selectivity |
dB |
W* |
dBc |
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|
9315 |
9 |
50 |
12 |
750 |
<.3uV |
-38 |
1.0 |
-40 |
|
|
|
|
|
|
|
|
|
9317 |
8.06 |
50 |
10 |
600 |
<.3uV |
-45 |
1.5 |
-40 |
|
|
|
|
|
|
|
|
|
9320 |
4 |
60 |
10 |
600 |
<.3uV |
-45 |
2.0 |
-40 |
|
|
|
|
|
|
|
|
|
9330 |
4.1 |
20 |
6 |
350 |
<.3uV |
-56 |
2.0 |
-40 |
|
|
|
|
|
|
|
|
|
9340 |
5 |
60 |
12 |
750 |
<.3uV |
-38 |
2.2 |
-40 |
|
|
|
|
|
|
|
|
|
9380 |
6 |
60 |
10 |
600 |
|
|
|
|
|
|
|
|
|
|
|
|
|
*RF power output at 13.8 Vdc supply voltage.
CONTROL LOCATIONS AND FUNCTIONS
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MFJcub |
TUNE |
|
|
VOLUME |
4 |
5 |
|
Power 3 |
|
|
1 |
|
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|
|
|
|
2 |
PHONES |
QRP CW Transceiver |
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1.Power LED: Indicates when transceiver is turned on.
2.Power Switch: Applies power to transceiver.
3.Phone Jack: Accepts 3.5 mm stereo headphone jack (stereo wiring).
4.Volume Control: Adjusts volume to comfortable level.
5.VFO Tuning: Selects transceiver's operating frequency.
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MFJ cub QRP CW Transceiver |
Operation Manual |
Model MFJ-93xx |
|
|
|
xx Meter |
|
|
|
QRP CW Transceiver |
|
|
|
6 |
7 |
8 |
|
MFJ Enterprises |
|
- |
+ |
Starkville, MS USA |
|
Power |
|
Key |
Antenna |
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6.Key Jack: Accepts 3.5 mm plug from key or keyer, mono wiring.
7.Antenna Jack: Accepts RCA plug from 50 ohm antenna.
8.Power Jack: Accepts 5.5 mm OD, 2.1 mm ID coaxial plug, (+) to center.
QUICK-START OPERATING INSTRUCTIONS
Power Sources: The cub requires a regulated 12-14 VDC source capable of delivering 400 mA. Power connection requires a 5.5 mm x 2.1 mm coaxial plug (use Radio Shack 274-1567). Wire (+) voltage to center terminal, and (-) to common.
- |
+ |
- |
|
+ |
Power Supply |
Important Note: Unregulated DC sources--wall cubes, solar panels, etc.--may damage your radio. A simple regulator circuit, like the one shown below, will provide protection. Note that U1's heat sink is 1.8 V above ground and must be isolated.
15 - 28 V |
+ |
Unregulated |
- |
Source |
U1 |
Attach heatsink here |
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+ |
C1 |
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|
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-13.8 V Reg. |
C2 |
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D1-D3 |
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Parts
U1 - 7812 Regulator
D1-D3 - 1N4001 Diode
C1-C2 - .1 uF
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MFJ cub QRP CW Transceiver |
Operation Manual |
Headphones: Use standard walkman-type stereo headphones exhibiting 8-40 ohms impedance (higher-quality headsets often yield better performance). Alternatively, plug in any extension speaker with a similar load impedance. Be sure to use only stereo type plugs--a mono plug will short the radio's audio output to ground!
Audio Line
NC
Keys and Keyers: Use any hand key or electronic keyer with a 3.5 mm plug (mono or stereo plug okay). Connect the key line to the jack's tip and the common line to the sleeve.
Key Line |
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Mono Plug |
Stereo Plug |
NC |
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|
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NC |
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Key |
Key |
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Antennas: The cub is designed to work with any efficient 50 ohm antenna exhibiting a VSWR of 2:1 or less. Suggested dipole lengths are shown in the following diagram, along with data for adding a simple coaxial choke-type balun:
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Length |
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15 |
Meters: 22' 2" |
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Coax Balun |
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17 |
Meters: 25' 10" |
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15 Meters: 6', |
8 turns |
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20 |
Meters: 33' 2" |
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17 Meters: 7', |
8 turns |
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30 |
Meters: 46' 4" |
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20 Meters: 8', |
8 turns |
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40 |
Meters: 65' 10" |
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30 Meters: 10', 7 turns |
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80 |
Meters: 130' |
RG8X or RG58 |
40 Meters: 15', 6 turns |
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80 Meters: 20', 8 turns |
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For best performance with any antenna, install as high and in the clear as possible. The ARRL Antenna Handbook, The ARRL Antenna Compendium, and many other amateur publications--including several from MFJ--offer additional antenna tips and suggestions.
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