Vectronics PM-30 User manual

VECTRONICS PM-30
SWR/Power Meter
INTRODUCTION
The PM-30 can simultaneously measure and display forward power,
reflected power, and SWR in the frequency range of .8 to 60 MHz.
Accuracy of the readings is assured because the PM-30 features a
true shielded directional coupler. The back lit meter can also display
either peak or average power readings.
SPECIFICATIONS
FREQUENCY RANGE:............ .8 to 60 MHz
POWER RANGE:......................300 and 3000 W
METER LAMP:......................... 2 V DC with on/off switch
OPTIONAL ADAPTER: ..........Vectronics AC- 2
DIMENSIONS:..........................5.3"W x 5.75"D x 3.5"H
WEIGHT:................................... .2 lbs.
CHASSIS: .................................Alodine Plated Aluminum

FRONT PANEL CONTROLS
ON/OFF ....................................Meter Lamp Switch
3000W/300W.............................Range Switch
PEAK/AVG................................Selection Switch
REAR PANEL CONNECTIONS
RF OUTPUT..............................SO-239 Connector
RF INPUT..................................SO-239 Connector
POWER CONNECTOR ...........2.5 mm coaxial type jack
INSTALLATION
. Connect the coax connector labeled RF INPUT to the transmitter
using PL-259 connectors. If using an antenna tuner, the PM-30
should be placed between the transmitter and antenna tuner.
2. Connect the coax connector labeled RF OUTPUT to the antenna
using a PL-259 connector. If using an antenna tuner, the RF
OUTPUT is connected to the antenna tuner input.
Note: Vectronics recommends using high quality coax cable for all
coax connections.
3. If a lighted meter is desired, a 9- 2Vdc power supply, such as the
AC- 2, must be connected to the power jack on the back of the unit.
This is a 2.5mm coaxial type jack with the center positive.
OPERATION
. Set the desired power range by using the push-button switch on the
front panel labeled POWER 3000W/300W. With the switch in the out
position, the 300W range is selected. When the switch is locked in,
the 3000W range is selected.

2. The Peak Reading feature may be switch on/off by using the
pushbutton switch labeled POWER PEAK/AVG. Peak reading is
activated when the switch is locked in.
3. SWR is indicated at the intersection of the two meter pointers.
While transmitting, read the SWR from the red SWR line nearest the
intersecting point.
CALIBRATION
To null the directional coupler, apply power through the RF INPUT
connector, terminating the output in 50Ω. Adjust the power level for
50- 00 Watts on the 300 W range. Looking from the front of the
meter, adjust the left-hand trim capacitor on the directional coupler
board for a null or minimum meter deflection. Reverse the input and
output cables and again apply power. Adjust the right-hand trim
capacitor for a null on the other meter.
Using a calibrated source, adjust the meter with the internal trimpots
as label in the following diagram:

PM-30 SCHEMATIC