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JJJelectronics-3 band direct conversion receiver-v1
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The JJJelectronics direct conversion receiver -v1 is an amateur radio receiver in kit form .It covers the 40m and 80m with provision to add additional frequency bands by means of plug-in modules.
The DC receiver -v1 is a direct conversion receiver suitable for SSB and CW
Technical details
Frequency band 80m (3.5MHz -3.85MHz), 40m (7.0MHz -7.11MHz) ,Plug in modules can be used to give additional bands
Frequency tuning: separate FET VFO for each band with voltage stabilised feed to oscillators.
Mixer: MC1496 integrated circuit double balanced mixer.
Audio 2500Hz SSB filter and 700Hz CW filter (push button switch to switch between them) employed with audio output of up to 1W into 8-Ohms speaker.
Power required 11.5v to 14v DC.
Protection diode for wrong polarity
. Tool required.
Soldering iron (25w-40w), small cutter, and trimming tool for oscillators and filters coils.
Let’s build the receiver
I would recommend fitting the parts in the order they appear in the part list.
Resistor first, then semiconductors, fixed coils, Capacitors and variable coil.
Make sure you put the electrolytic capacitors and diodes in the right way round .keep all components leads as short as possible.
When you have finished assembly of the board, check all the parts are in the right places.
The soldering looks bright and good. Re-solder any suspect joints with a little fresh solder, check that there are no short or splashes of solder between tracks.
Resistors
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R1 4k7 yellow -purple –red R18 1k brawn – black - red
R2 150R brawn- green- brawn R19 33k orange- orange-orange
R3 4k7 yellow -purple- red R20 33k orange- orange-orange
R4 27R red -purple –black R21 2k2 red -red -red
R5 100k Brawn -Black –yellow R22 820R grey -red -brawn
R6 4k7 yellow -purple –red R23 1k brawn – black - red
R7 150R brawn- green- brawn R24 390R orange-white-brawn
R8 4k7 yellow -purple –red R25 2k7 red -purple –red
R9 27R red -purple –black R26 390R orange-white-brawn
R10 100k Brawn -Black –yellow R27 2k2 red -red -red
R11 2R7 red- purple-gold R28 8k2 grey – red - red
R12 3k3 orange – orange - red R29 1k2 brawn – red - red
R13 3k3 orange – orange - red R30 2k7 red -purple –red
R14 10k brawn – black – orange R31 47R yellow-purple-black
R15 12k brawn- red-orange R32 47R yellow-purple-black
R16 12k brawn- red-orange R33 1k5 brawn – green - red
R17 270k red –purple –yellow R34 47R yellow-purple-black
R35 3k3 orange – orange - red
Transistor, Diode and IC
[pic][pic]
Q1 BF245
Q2 BF245
T1,T2,T3,T4 2N2222
They should be installed in the board as the outline printed on the board shows
IC1 MC1496
IC2 LM380
IC4 78L09 9v regulator, the shape is like transistor shape. It should be installed in the board as the outline printed on the board shows
IC5 TL074
All ICs should be installed in the board as the outline printed on the board shows
D1 1N4001 (black colour with white line)
D3, D4, D7, D8, D9, D10 1N4148 (glass with black line)
Please check the polarity of each diode, they should be installed in the board as the outline printed on the board shows
Coils
L1 variable inductor A110TK
L2 variable inductor A530TK
L5 variable inductor A9C21TK
L10 variable inductor A9C21TK
L11 220uh red – red – brawn
L12 Binocular ferrite core- see the text
Capacitors
[pic][pic]
C1 10nf marked 103
C2 100pf marked 101
C3 100nf marked 104
C4 22nf marked 223
C5 100nf marked 104
C6 10nf marked 103
C7 10nf marked 103
C8 10nf marked 103
C9 100nf marked 104
C10 see text NP0 capacitor for oscillator only ,see text
C11 see text NP0 capacitor for oscillator only ,see text
C12 see text NP0 capacitor for oscillator only ,see text
C13 10nf marked 103
C14 180f marked 181
C15 100nf marked 104
C18 10nf marked 103
C19 10nf marked 103
C20 100nf marked 104
C21 see text NP0 capacitor for oscillator only ,see text
C22 see text NP0 capacitor for oscillator only ,see text
C23 see text NP0 capacitor for oscillator only ,see text
C24 10nf marked 103
C25 100uf/25v marked 100uf
C26 220uf/25v marked 220uf
C27 100nf marked 104
C28 100nf marked 104
C29 22uf/63v marked 22uf
C30 1uf/63v marked 1uf
C31 22nf marked 223
C32 10nf marked 103
C33 47nf marked 473
C34 10nf marked 103
C35 100nf marked 104
C36 1nf marked 102
C37 1uf /63v marked 1uf
C38 100nf marked 104
C39 4.7nf marked 472
C40 4.7nf marked 472
C41 47nf marked 473
C42 10nf marked 103
C43 100nf marked 104
C44 10nf marked 103
C45 4.7nf marked 472
C46 10nf marked 103
C47 10nf marked 103
C48 100uf/25v marked 100uf
C49 100nf marked 104
C50 47uf/25v marked 47uf
C51 47uf/25v marked 47uf
C52 100nf marked 104
C53 100nf marked 104
C54 100nf marked 104
C55 100nf marked 104
C56 1uf/ marked 1uf
VC1 module ( variable capacitor 60pf )
C25, C26, C29, C30, C37, C48,C50,C51 and C56 are electrolytic capacitors and must be installed the correct way round. The Longest lead is normally positive, this lead should go to the hole marked “+“on the circuit board.
Miscellanies
VR1 -------1Kvariable resistor
VR2 ------ 10K variable resistor
Two DPDT switches (SW1 and SW2)
Rotary switch
Kit come with 16x pins terminal, 4 way connector and 5 way connector.
J3 is jumper (linked wire) you have to solder a piece of wire between J3 holes
J4 is jumper (linked wire) you have to solder a piece of wire between J4 holes
ANT and GND are for antenna cable ,the ANT-IN should go to the center of the BNC connector and the GND pin terminal should go to the ring terminal of the BNC connector
The frequency counter(not supplied) has 4 pins two of them are for power, marked as +12v and GND ,these 2 pins should go to the +12v and GND in the main board. the other 2 pins from frequency counter are for input ,one of them marked input ,this should go to the FC in the main board and the other pin from frequency counter (GND ) should go to the GND in the main board
On the PCB there are two holes marked SP1, SP2, they are for speaker (not supplied) any speaker between 1w and 2w will be fine
Binocular ferrite core
You have to make 2 coils
Wind 8 turns of the thin enamelled yellow wire tightly onto the two holes balun core. Passing the wire through one hole and then back out of the other counts as one turn. Do this 8 times for eight turns. Both ends of the wire should project from the same side as shown.
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[pic]
Wind 2 turns of the enamelled red wire as shown.
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You have to remove the varnish from the enamelled wire ends ,you can use fine sandpaper or you can use hobby knife.
L12 is the Binocular ferrite core it has 4 holes ,the yellow coil should go to holes 2 and 3,
The red coil should go to holes 1 and 4
Assembling
After you assembled the board with all components and pin terminals:
1: fit 4 spacers m3 x5mm and four m3x4mm screws to the chassis as shown below
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[pic]
2: add M8 lock washer to the variable resistors as shown below :
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3: fit the board to the chassis ,use four m3x4mm screws as shown below:
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4: fit two M7 nut to the variable resistor and fight them as shown below:
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5: solder wires to the rotary switch as shown below make sure to solder the right wire colour to the right number for the rotary switch
A = blue , B = Green , 1= purple , 2 = pink , 3 =brown , 4 =yellow , 5 = orange , 6 =gray
[pic] [pic]
[pic]
6: After you soldered the rotary switch ,add M12 washer to the switch and fit it to the chassis ,use the nut that came with it and tight as shown below:
[pic] [pic]
7: now solder the wires from rotary switch to the board ,make sure the wires are not too long and away from the variable capacitor module as shown .
A, Blue colour to S
B, Green to the side pin of variable capacitor (not middle terminal)
1, Purple to the S2
2, Pink to the S1
3, Brown to the S3
4, Yellow to the VC2
5, Orange to the VC1
6, Gray to the VC3
use white wire , solder it from variable capacitor (middle terminal to the board,GND as shown
[pic] [pic]
[pic] [pic]
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8: fit the BNC connector ,earphone connector and power connctor (use M3x10mm screws with M3 nuts) as shown
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9: solder SP1 (gray colour to the top terminal of earphone and solder SP2 (green colour to the side terminal of the earphone as shown
Note: it is very important not to swap between SP1 and SP2 ,please follow the photo, if you swap them you will damage the audio amplifier IC (LM380)
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[pic]
10: connect the BNC connector as shown below
Ant-in, to the center of the BNC (purple colour) and GND to the other BNC terminal (black colour)
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11:solder red wire from the +12v terminal (on the board) to the red terminal of the power connector and solder the black wire ,GND terminal (on the board) to the black terminal of the power connector as shown below
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Testing
You need a frequency counter
Connect the frequency counter to the pin terminal marked FC on the PCB
FC connector should go to input (number 1) of frequency counter and the second pin of the frequency counter (pin 2) should go to pin terminal marked GND on the PCB.
You will need to adjust the oscillator coils (L10 and L5) to set the exact frequency coverage of the radio.
You must use a proper insulated trimming tool to adjust the cores of the coils.
Use the frequency counter (not included with the kit), you can read the receiver frequency directly.
To adjust the 80m band, put the rotary switch to 80m.
Turn the tuning capacitor clock wise (minimum reading) adjust L10 until you get about 3.50MHz
Now turn the tuning capacitor to the maximum and you should get around 3.85MHz
To adjust the 40m band, put the rotary switch to 40m.
Turn the tuning capacitor clock wise (minimum reading) adjust L5 until you get about 7.0 MHz
Now turn the tuning capacitor to the maximum and you should get around 7.14MHz
Connect antenna and adjust L2 for 80m, for minimum noise (normally the core will be down to the end
Adjust L1 for 40m, for minimum noise (normally the core will be down to the end
Adding additional channel
SV3 and SV5 are PCB mounting plugs and form the connectors for the optional plug-in band modules. Insert the plug-in module (not supplied) to SV3 and SV5 .change the rotary switch to ch3 position and follow testing procedure as above
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Adding frequency counter
Mount the frequency counter to the 3 bands receiver (use M2.5x6 screw ,supplied with frequency counter)
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1 :Solder 2 wires black and red to the input of frequency counter (red to pin number 1 and black to pin number 2).
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2:Solder the red wire to the FC terminal on the receiver and solder the black wire to the GND on the receiver .
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3: now solder another 2 wires (red and black)
From frequency counter +12v to the IC4 on the receiver and solder black wire from frequency counter ,GND to the GND of the receiver as shown
Make sure not to make any short to the IC4
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If you need any help email me, jjjelectronickit@yahoo.co.uk
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