KATAΣΚΕΥΗ PLL FM 1 WATT WITH LCD BROADCAST WAREHOUSE
WITH CHIMATIC AND MATERIALS
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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