LDG M-7700 Operation Manual
M-7700 OPERATIONS MANUAL MANUAL REV A
LDG M-7700
External Meter for
Icom IC-7700
PAGE 1
LDG Electronics
1445 Parran Road
St. Leonard MD 20685
Phone: 410-586-2177
Fax: 410-586-8475
ldg@ldgelectronics.com
www.ldgelectronics.com
Table Of Contents
Introduction 3
Jumpstart, or “Real hams don’t read manuals!” 3
Specifications 4
Getting to know your M-7700 4
Front Panel: 4
Back Panel: 5
Installation 6
Setup 7
Initial Calibration 7
Meter Parameter Selection 8
Operation 9
Application Notes 9
Base Station Use 9
Remote Use 9
Other Applications 9
Care and Maintenance 10
Technical Support 10
Two-Year Transferrable Warranty 11
Out Of Warranty Service 11
Returning Your Product For Service 11
Product Feedback 2
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INTRODUCTION
LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories in St.
Leonard, Maryland, LDG continues to define the state of the art in this field with innovative automatic
tuners and related products for every amateur need.
Congratulations on selecting the LDG Electronics M-7700. The M-7700 provides accurate and
precise metering for a wide range of receive and transmit parameters. While many users will choose to
display S-meter readings on receive, and Power Output on transmit, several other useful readings are
available.
The M-7700 plugs into the external meter jack on the Icom IC-7700 transceiver. The parameter
displayed on the M-7700 can be either the same as the parameter displayed on the main IC-7700 virtual
meter, or can be independant of what is displayed on the main meter, giving the flexibility to watch two
parameters at the same time.
JUMPSTART, OR “REAL HAMS DON’T READ MANUALS!”
Ok, but at least read this one section before operating the M-7700:
1. Configure the IC-7700 for normal operation.
2. Plug the M-7700 into the radio’s meter jack using the included 1/8” stereo cable. The meter jack is on
the rear of the transceiver, between the DC Out jack and the External Keypad jack.
3. Optionally, connect a 12 volt, 250mA DC power supply to the 2.5x5.5mm coaxial power jack (center
positive) on the rear of the M-7700. This only is needed for powering the backlight; the meter will
function without 12V.
4. Using the radio’s setup menu, select which parameter to display on the M-7700 under the ACC menu,
“External Meter Output” menu.
5. Operate the radio normally; the meter will continuously display the selected value. S-meter function is
normally shown on receive, and the selected parameter on transmit.
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SPECIFICATIONS
Giant, 4.75” (diagonal) 500 µA analog meter movement.
•
S-meter on receive, Drive current, Drive voltage, Power Output, SWR, Compression level, and
•
ALC on transmit.
Externally powered cool blue backlighting with adjustable brightness.
•
On/Off switch for backlight.
•
Dimensions: 5.3 x 4.2 x 4.7 inches.
•
Backlight requires 12VDC, 250mA. 2.5 x 5.5mm jack, center positive.
•
GETTING TO KNOW YOUR M-7700
Your M-7700 is a quality, precision instrument that will give you many years of outstanding service;
take a few minutes to get to know it.
Front Panel:
The front panel of the M-7700 shows seven calibrated scales:
S: Received signal strength
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ID: Final Output Transistors Drain Current (Amps)
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PO: Transmit power output in watts
•
SWR: Transmit Standing Wave Ratio
•
COMP: Compression ratio, in dB
•
ALC: Auto Level Control
•
: Final Output Transistors Drain Voltage
V
•
D
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