| FD-SWM-HF
Now under final test: 21/03/08
Measuring
SWR at HF from 0 to around 60MHZ was
always an interest to radio amateurs. Till date, thousands of radio
amateur run their station without an SWR Meter to know how good is
matching beteen Tx and Ant.
SWR
Meters of Analog variety are ample, although, not very economical.
LCD meters are more expensive, crossing a range of over $140.
LCD
SWR Meter presented here meet many simple task using a PIC16F877A
micro controller. The very basic purpose to make this project is to
encourage radio amateurs to build their own SWR Meter at very low
price instead of buying ready made at high prices.
Following
task achieved thru this design:
1.
Simple single micro controller with built-in A/D converter.
2.
Simple single Toroid HF Bridge
3.
Back light control
4.
SWR, FWD, POWER and Actual Power to antenna
calculations/Display.
5.
Bar Graph mode for SWR & Forward Power
6.
Compact Design
7.
May be powered from DC9V battery or 12V DC
PIC
projects are very dear to radio amateurs and other enthusiasts
because of their easy programming needs and ample of source codes
already available to experiment with.
Project
Bases:
Project
is developed on two double-sided PTH boards. The first one is CPU
board where LCD, Regulator and Back Light Controllers are located.
This board receives pure DC level from sensor board for calculation
& display.
The
second board is RF Sensor Bridge where power from your transceiver
comes in and goes out to antenna. It is a simple HF Toroidal Bridge
design using 1N5719 or BAT85 diodes.
Although
SO239 types of connectors are used, there is no reason why you
cannot use N type connectors. They will fit nicely on four mounting
holes available for SO239 sockets.
|
button. 
button
to see
what all
items you
have. You
may change
quantity
if
required
&
proceed to
"Check-out".
