KWZ-PM
Digital Precision RF-Power- and SWR-Meter


KWZ-PM Digital Precision RF-Power- and SWR-Meter


Short Description

The device consists of a measurement coupler with current and voltage converters and a digital controller- and display-unit.
The coupler and the controller/display unit can be in separate housings (type KWZ-PM1) or both can be united in one housing (type KWZ-PM2). A second coupler can be connected which is activated via the menue.

measurement coupler
measurement coupler

The KWZ-PM excells itself by:

The measurement error is 3% maximum of the indicated value.
The measured data are displayed on a graphic LCD in digital and analog format. The LCD is mounted behind an anti-glare acrylic glas front panel. The display is illuminated when the device is run with +12Vdc.
The measured values are displayed as three-digit numbers in Watt and dBm. Additonally a bar-graph can be switched on. This analog display is dB-linear.

The KWZ-PM offers the following function modes:

  1. display of the average powers Pfwd and Prefl and the SWR,

  2. display of the peak values of the powers Pfwd and Prefl with adjustable hold time and the SWR,

  3. display of the delivered power Pd = Pfwd - Prefl as peak values with hold time and the SWR. This power is radiated by the antenna.

  4. Display of the Pfwd as peak value and average value simultaneously and the difference delta in dB. In this mode the compression grade of the modulation can be estimated.


Menue Screen

Here all variable parameters displayed, the be changed or selected:
KWZ-PM RF-Powermeter: Display without Bargraph
 display without bargraph
 KWZ-PM RF-Powermeter: Display with Bargraph
 display with bargraph


Additional functions:

  1. ALO = automatic lockout: when a chosen SWR-value is exceeded the final amplifier can switched off or an alarm can be triggered. The switching circuit is potential free using an opto-coupler.

  2. RS-232-Interface: all measured values can be displayed and stored in a PC. The KWZ-PM can be controlled by the PC. A Windows-program is comprised.

  3. Control of the battery voltage with low voltage alarm, automatic charging of an accumulator (if used) from the +12 V-supply.


For the control of all functions and switching on and off only two keys are necessary, which are mounted right besides the display on the frontpanel.
The current supply is done externally with +12 Vdc from a plug-voltage supply or any other 12 Vdc source. Additionally the device can be supplied by a built-in 9V-blockbattery (or accumulator) for a portable operation. The illumination of the display is switched off. During operation with +12 Vdc no current is drawn from the battery. Is the +12 Vdc switched off the device will continue working without any interruption with the internal 9 V-supply, battery or accumulator.


Technical Specifications

Frequency Range:

1,8 – 60 MHz

Power Range:

1 mW – 3.000 W

Impedance:

50 Ohms

Insertion Loss:

0,02 dB

Measurement Accuracy:

max. 3%, typical 2%

Directivity:

min. 40dB, typically 45 dB

max. Signal Voltage:

1000 V rms

max. Signal Current:

20 A rms

Operating Temperature:

-20 - +50 C

Display:

  • LC-Display 128 x 64 pixel (72 x 38 mm),

  • with backlighting,

  • Frontpanel acrylic glas with antiglare surface,

Displayed digital values:

  • Pfwd in Watt and dBm, 3 digits

  • Prefl in Watt and dBm, 3 digits

  • SWR, 3 digits

Graphical Display:

Pfwd and Prefl as bar-graph, logarithmic or dB-linear, additionally.

Operating Modes:

  • average power

  • peak power and hold

  • delivered power (Pfwd - Prefl)

  • average and peak power simultaneously

  • menue screen adjustable values

Additional Functions:

  • RS 232 connection to a PC for display and storage of measured values

  • ALO = automatic lock-out, disconnection of a linear control signal if a chosen SWR-value is exceeded or triggering of an alarm, potential-free

  • charging of an accumulator (only with the +12 V supply)

Voltage Supply:

  1. external +12 Vdc, min. 10 V, max. 16 V,

  2. internal 9V-block-battery or accumulator

Current Consumption:

  1. 150 mA, with backlighting

  2. 90 mA, without backlighting

Backlighting of the Display:

only available with the +12V= supply

Enclosures:

 Enclosure type no. 1: The display unit with the controller and the Coupler in a separate enclosures and are connected by an USB-cable.

Enclosure type no. 2: The display with controller and the coupler are housed in a common enclosure.

Connections Enclosure type 1:

  • Voltage supply: +12 Vdc, receptacle 5.5 mm

  • ALO: 2 Cinch connectors

  • Charging of accumulator: Jumper 2.5 mm

  • Coupler: 2 x USB-connectors (2 couplers can be connected simultaneously)

  • RS 232: D-Sub-connector 9-pin

  • Box for 9V-battery in back panel

Connections Coupler:

  •  2 x Coax-Socket SO 239, teflon isolated, contact gold plated, optional N-connectors, same quality (no additional costs)

  •  1 x USB-connector

Connections Enclosure type 2:

  • 2 x Coax-Socket SO 239,   optional N-connectors 50 Ohms (no additional costs)

  • Voltage supply: +12Vdc, receptacle 5.5 mm,

  • ALO: 2 x Cinch connectors,

  • Charging accumulator: Jumper 2.5 mm,

  • 1 x USB-connector for external coupler,

  • RS 232: D-Sub-connector 9-pin,

  • Box for 9V-battery in back panel,

Dimensions Enclosure type 1:

152 x 120 x 50 mm (incl. stand),

Dimensions Enclosure type 2:

150 x 100 x 100 mm

Dimensions Coupler:

90 x 80 x 50 mm (incl. Coax Sockets),

Quality of Enclosures:

  • all enclosures are manufactured from stainless steal sheet metal 1 mm thick.

  • The enclosures are spotwelded and ensure a complete shielding of all units.

  • The display enclosures are painted grey-black.

  • Enclosure type 1 is equipped with a stand made of aluminium.

  • The viewing angle of the display can be adjusted.



Prices

Type Price incl. VAT Price w/o VAT
KWZ-PM including
  • Display-Unit
  • 1 Coupler
  • 1 USB-Cable 1.5 m
  • 1 Ext. Power Supply
    		•  465,29 Euro 391,00 Euro
    KWZ-MW
  • additional Coupler
    		•  209,44 Euro 176,00 Euro
    All prices plus postage.

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