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MFJ Cub Скачать руководство пользователя страница 9

MFJ cub QRP CW Transceiver

Operation Manual

9

MFJ CUB ALIGNMENT AND SERVICE NOTES

1

3

2

4

5

6

1. BFO Trim (set for 600-Hz LSB passband center)
2. VFO Cal (set for desired CW band segment)
3. Rx BPF (tune for maximum sensitivity)

4. Tx Offset (set for 600-Hz sidetone pitch)
5. Power (set for onset of gain compression)
6. Tx BPF (tune for maximum power output)

Alignment Control Function

Important Note:

If you lack the necessary test equipment and skills to make

these adjustments, seek assistance from a qualified technician. Misalignment
will degrade transceiver performance and may also result in spurious out-of-band
operation in violation of FCC rules. MFJ

cannot

be held responsible for

transceiver misalignment in the field.

Voltage Chart:

Voltage charts are useful for diagnosing circuit problems and

isolating component failures. Any voltage variation of 10% or more

may

indicate a problem.

Important Note:

Exercise caution when testing SMD circuitry with conventional

bench probes. If the voltmeter probe shorts to adjacent pins during the
measurement, component damage may result. If you lack the tools and training
to troubleshoot SMD circuitry, seek assistance.

Transistor Voltages

Q1 Q2 Q3 Q4 Q5* Q6* Q7 Q8 Q9

E/D

0 --- --- 13.8 --- --- --- 13.8

12.8

B/S

0.7 --- --- 2.7 0.7 0.3 --- 13.3

13.5

C/G

8.3 13.8 --- --- 8.3 13.8 13.8 0.4 13.8

*Voltage values obtained with radio in transmit mode. Do not place test probe on Q7 during
transmit--RF may damage meter.

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Содержание Cub

Страница 1: ...nted 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 Cu...

Страница 2: ...uV 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 TUNE VOLUME Power 1 2 3 4 5 PHONES MF Jcub QRP CW Transceiver 1 Power LED Indicates when transceiver is turned on 2 Power Switch Applies power to transceiver 3 Phone Jack Accepts 3 5 mm stereo headphon...

Страница 3: ...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 ...

Страница 4: ...ne NC Stereo Plug Mono Plug Key Key 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 17 Meters 25 10 15 Meters 22 2 20 Meters 33 2 30 Meters 46 4 40 Meters 65 10 80 Meters 130 Length Coax Balun 17 Meters 7 8 turns 15 Meters ...

Страница 5: ...to wring the last few milliwatts from your radio by turning the trimpot fully clockwise will only overdrive the transmitter mixer stage and add unwanted spurious products to your signal GETTING INVOLVED WITH QRP Technically speaking operating QRP means limiting your transmitter power to below 5 watts on CW or below 10 watts PEP on sideband However for a growing number of licensed amateurs the QRP ...

Страница 6: ...o provide links to local and regional QRP clubs around the world plus links leading to a wealth of operating and technical information QRP DX Operating Tips Competing with more powerful stations to capture QSLs from rare DX prefixes requires patience and good operating skills Here are 10 tricks of the QRP trade you can use with your cub to land the tough ones 1 Hunt and pounce There s never a pile...

Страница 7: ...he receiver remains on in transmit mode to provide CW sidetone BPF IF Amp AGC Atten Det Rx Mxr VFO LO Prod Det AF Amp U4 Tune Vol Ladder Filter U2 U3 Q1 Q3 Y1 Y3 L1 L2 U5 Buffer Pwr Tx Tx Mxr Offset BPF L6 L7 Q5 Q6 BFO Q4 T R Q8 Q9 Key Q2 T R D4 D7 L10 L11 Antenna Phones AGC Q7 Driver PA U1 V Reg T R Pwr Sw1 BFO Freq Tx CR1 Regulator D3 D1 C27 C40 R19 In transmit buffer Q4 samples U2 s VFO signal ...

Страница 8: ... questions the technicians may ask You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by Facsimile to 662 323 6551 or by email to techinfo mfjenterprises com Send a complete description of your problem an explanation of exactly how you are using your unit and a complete description of your station Won t Power Up Check power source and associated...

Страница 9: ...band operation in violation of FCC rules MFJ cannot be held responsible for transceiver misalignment in the field Voltage Chart Voltage charts are useful for diagnosing circuit problems and isolating component failures Any voltage variation of 10 or more may indicate a problem Important Note Exercise caution when testing SMD circuitry with conventional bench probes If the voltmeter probe shorts to...

Страница 10: ...4 3 0 0 0 0 4 4 2 4 3 0 4 7 5 4 2 4 3 7 2 4 7 6 0 5 4 5 5 13 8 5 8 7 0 4 9 5 1 7 0 5 5 8 13 8 5 5 5 5 1 4 5 9 Component Pinout SO 8 IC Package 1 2 3 4 8 7 6 5 SOT 23 Transistor Package Style 6 C B E Style 21 Style 10 G S D D S G SA602 LM386 78L09 2N3904 2N3906 2N2222 2N7002 J310 1N914 A C N C E B C Top 2N5109 case ...

Страница 11: ...MFJ cub QRP CW Transceiver Operation Manual 11 PARTS PLACEMENT ...

Страница 12: ...MFJ cub QRP CW Transceiver Operation Manual 12 SCHEMATIC ...

Страница 13: ...MFJ cub QRP CW Transceiver Operation Manual 13 NOTES ...

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