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After success of PM2 & PM3 LCD RF Power Meter Kits, with
hundreds of users globally, I wanted to implement small & big
changes opted by the radio amateurs.
Following added to PM3A
RS232:
1. LCD now
mounts on CPU
Board or may be Remote
2. Encoder
or Push Button Key Boards
3. Sensor Board is now remote
4. Support
for AD8307 SMT (SMT Sensor Board)
5. Data
output at RS232 Levels by using a MAX232.
6. Precession 2.5V reference added.
7. SMT support for AD8307 by
way of providing a a specially designed Sensor PCB supporting AD8307
SOIC 8.
(Not part of present kit)
8. LCD Back-Light may now be
turned off to save power.
Following remain same as
good old PM3:
1. Data
Logger output supported by OZ8JYL
Windows Software
and G4HFQ
Polar Plot Software
2. Basic Schematic is almost same
with change in labels and addition of few RFCs & Capacitors.
3. FRC 16 pin connector
for CPU Board and R/A 16FRC supplied for remote LCD mounting. A Female-to-Female, 30cm long,
16-wire ribbon cable is supplied for remote LCD mounting.
4. DIP Switches for changing LCD
Back Light Forward/Reverse Polarity.
5. Works
well with G4HFQ "Polar Plot" Software
A 40db Attenuator for this RF
Meter will be available soon
Calibration
Guide by K7SFN
Now all kits & assembled are
supplied with a Free Powder coated metal case for PM3A & Sensor board.
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