Antonio Alfinito / I2TZK
Dziurda / K7SFN
Gajjar / VU2FD
Dual Channel LCD SWR Meter SWM2 was a great
success. Hundreds of Radio amateurs built it with success. With more
and more feedback pouring-in and many demanding an SWR Meter with
USB built-in, Tony/I2TZK decided to
go for an SWR
meter which is True USB and USB Powered.
SWM3 is an USB CPU Powered by USB port. Based
on Microchip's PIC18F4550 40DIP Chip, all what that we require was
this a PIC and very few components. FTDI type SOIC chip for USB
Communication is no longer
required as 4550 already has USB communication.
This new CPU is developed keeping in mind
existing HF and VHF Bridges with which its fully compatible. This
makes it ready to
use USB Powered CPU for ham station/shack.
Firmware and PC Software (WinXP/WIN7) for SWM3, Dual channel LCD
SWR Meter presented here is developed by Antonio
Alfinito / I2TZK for the ham community.
Purpose of this project is to
encourage radio amateurs to build their own SWR Meter at a low
PC Software (WinXP/WIN7) & PIC Firmware V2.0 for SWM3 has achieved
following design task:
is developed on two double-sided PTH board. The first one is CPU
board where LCD, Regulator and Back Light Controllers are located.
This board receives pure DC level from sensor (Bridge) board for calculation
second board is RF Bridge, where power from your transceiver
comes in and goes out to antenna. Varity of Bridges are offered.
Please refer to capability of each Bridge in related documents.
SO239 types of connectors are used but Type N
may be offered as an option.
is intended for experienced Radio Amateurs.
rated at 100W HF, this meter & bridge works very well at a KW
or two, on all bands. Readings were very accurate compared to
commercial SWR Meter.
A simple powder coated case for CPU and
bridges (HF Simple, Dual scale & VHF) are now available and
offered free of charge with kit or assembled.