ΚΑΤΑΣΚΕΥΗ PLL FM 1 WATT Broadcast Warehouse 1 Watt with LCD display

 PLL FM 1 WATT Broadcast Warehouse  with  LCD display

ΠΑΡΑΚΑΤΩ ΤΑ ΥΛΙΚΑ ΚΑΙ ΤΟ ΣΧΗΜΑΤΙΚΟ 

 


 

Parts List for Broadcast Warehouse 1 Watt LCD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Resistors
---------

R1, R2, R23        1 k
R3, R4            68 k
R5, R6            220 k
R7, R8, R10, R14, R15    1.2 k
R16            180
R17, R28        68
R18, R9            10
R20, R22, R25        470
R21            None
R24, R12        12 k
R13, R26        220
R27            2.2
VR1            1 k pot

Capacitors
----------

C1, C5, C13, C30    0.1 uF
C2            39 pF
C3, C4, C9        2.2 uF
C6, C7, C21        0.01 uF
C8, C17, C22        82 pF
C10, C11, C12, C20    33 uF
C14            4.7 pF
C15, C25        27 pF
C16, C26        56 pF
C18, C23, C24, C28    0.001 uF
C19            6800 pF for 75 uS
            4700 pF for 50 uS
C27            12 pF
C29            33 pF
C31            None
C32            220 pF

Misc
----

IC1            MC145170
IC2            PIC16F84
IC3            78L05
IC4            LF351
L1            MC120 075 sheilded variable
L2            4:1 transformer
L3            0.15 uH
L4            2.5 turns air variable
L5            3.5 turns air variable
T1, T2, T3        MPSH10
T4            2N4427
VD1            BB909
VC            5-65 pF variable
X1            8.0 MHz crystal
SW1, SW2        PCB push buttons
LCD            LCD display

Features
--------

* 1 Watt output minimum
* Broadband no-tune design
* Constant amplitude response
* Out of lock RF power down
* Harmonic filter
* LCD frequency readout
* PTH black oxide PC board
* RF ground plane, double sided PC board
* Audio (deviation adjust)

Specifications
--------------

Frequency Range        Selectable over 87.5 - 108 MHz
Step Size        100 kHz steps
Frequency Generation    microproesser controlled PLL VCO
Frequency Stability    Better than +/- 1 kHz max, typ +/- 500 Hz
Spurious Emissions    Better than -75 dB reference to carrier
Harmonic Emissions    Better than -60 dB reference to carrier
RF Power Output        800 mW min, 1000 mW typ.
Power Supply        12-15 volts DC regulated
Audio Input Sensitivity    0.775 V RMS (typ) to +/- 75 kHz deviation (adjustable)
Signal To Noise Ratio    -75 dBu
Audio Distortion    Better than 0.2% THD
Audio Freq Response    Flat from 20 Hz to 100 kHz

Assembly Instructions
---------------------

1. Empty the contents of the kit and proceed to check all of the components off
   against the component list. It is a good idea to tick off each component as
   you go through. When you have double checked all the parts proceed.

2.  We always start with the lowest height components first which are resistors,    Insert each resistor and solder one at a time taking care to make a good
    joint and not to short across any other pads/holes. Double check the
    component is the correct one before soldering.

3. Now insert VD1 (SEE DIAGRAM). Move on next to insert the choke L3 and solder
   this in also.

4. Now insert IC1 and IC2 (see diagram)

5. Next its time to insert the capacitors C1,2,5,6,7,8,13,14,15,16,17,18,21,22
   23,24,25,26,27,28,29,30,31 and 32. These can be inserted any way round,
   they are not polarized. Now insert the polarized electrolytic capacitors
   C3,4,9,10,11,12 and 20 MAKING 100% SURE they are soldered in correctly
   (SEE DIAGRAM). The board has a positive symbol next to the positive hole of
   polarized capacitor. Insert the negative stripe side away from the positve
   (+) marking. The last fixed capacitor is C19 (this component may need to
   be omitted form the unit, see pre-emphasis section overleaf to decide if
   you need to include it. If you do need to include it, choose the correct
   value from the component list.

6. Insert and solder T1, T2, T3 then move onto T4. Next, IC3, observing the
   correct component oriention marked on the board (SEE DIAGRAM)

7. Insert the crystal and the VC trimmer capacitor (next to the crystal), and
   then the metal canned coil L1, and moulded coils L4 and L5.

8. Wind the toroid core with the supplied twisted enameled wire as shown in
   the diagram and insert and solder as shown in the diagram. Push the clip
   on (star shaped) heatsink onto T4.

9. By this stage you should have the main component side of the board fully
   assembled, before moving onto the parts on the other side of the PCB,
   check all solder joints and connections.

10. Solder in the switches SW1 and SW2 them VR1 (variable resistor). Then, with
    the supplied standoff pillars, mount the LCD display above the uderside of
    the board making sure to line up the 14 way connector above the 14 holes
    left on the PCB. Take the left over cut-off resistor leads you have and
    pass them through the holes, soldering on the component side of the PCB
    and LCD screen side of the display PCB.

Power Supply
------------

This unit needs a regulated DC power supply between 12 and 15 volts. The only
difference with using 12, 13.8 or 15 volts is the output RF power. You will
get slightly more output power running the unit from 13.8 or 15 volts as
opposed to 12 volts. The unit needs a power supply that can deliver 500 mA or
higher.

You can connect the DC supply by either soldering the board on the two pads on
the top of the PCB or by soldering the leads through the holes onto the pads
on the bottom of the PCB. TAKE CARE TO SOLDER THE POSITIVE LEAD TO THE TERMINAL
MARKED +. REVERSE POLARITY OF THE LEADS WILL DAMAGE THE EXCITER. YOU HAVE BEEN
WARNED.

RF Out
------

Before turning on the unit YOU MUST connect a 50 ohm load to the RF output
connections. The two pads supplied are to enable you to connect a length of
50 ohms coaxial cable to a RF socket or amplifier. The smaller pad is for the
inner wire of the coax (the core) and the longer pad below the RF out pad is
to connect the outer of the coax (the braid). (SEE DIAGRAM)

We recommend a dummy load is used when tuning up this unit, or if you do not
have access to one, at least have an antenna connected to the output. FAILURE
TO HAVE A CORRECT 50 OHM LOAD (dummy load or antenna) ON THE OUTPUT MAY RESULT
IN DAMAGE OF THE OUTPUT TRANSISTOR (T4). YOU HAVE BEEN WARNED.
 


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