HF ANT

2 CONNECTIONS

Antenna connection

Grounding

Antennas play a very important role in receiver opera- tion. Connecting a poor quality antenna to the IC-R8500 will result in less than optimum perfor- mance.

The IC-R8500 requires at least 2 antennas for full fre- quency coverage: one for 0.1 to 30 MHz and one for 30 to 2000 MHz.

DUsing a long wire antenna for HF bands

The IC-R8500 has a 500 Ω phono (RCA) antenna

connector for the HF bands. When using a long wire antenna, instead of a 50 Ω matched antenna, use one as long as possible (at least 10 m, 33 ft) and select the active connector as follows:

Push [SLEEP/ SET ] for 1 sec. to enter quick set

mode.

Rotate the [M-CH] selector to select the “HF ANT” item.

Rotate the main dial to select the antenna connector.

Push [SLEEP/ SET ] momentarily to exit quick set mode.

500

RWARNING: NEVER use a gas pipe or electri- cal conduit pipe for grounding.

To prevent accidents involving electricity and interfer- ence from transceivers, ground the receiver through the [GND] terminal on the rear panel.

For best results, connect a heavy gauge cable to a water pipe or long, earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible.

TYPE-N CONNECTOR INSTALLATION EXAMPLE

Nut Rubber gasket

 

15 mm

 

Clamp

 

Washer

3 mm 6 mm

 

Center conductor

(10 mm 38 in)

Slide the nut, washer, rubber gasket and clamp over the coaxial cable, then cut the end of the cable evenly.

Strip the cable and fold the braid back over the clamp.

Solder hole

No space

Plug body

Soft solder the center conductor. Install the center conductor pin and solder it.

Carefully slide the plug body into place aligning the center conductor pin on the cable. Tighten the nut onto the plug body.

• Be sure the center conductor is the same height as the plug body.

PL-259 CONNECTOR INSTALLATION EXAMPLE

 

30 mm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Coupling ring

10 mm (soft solder)

10 mm Soft

 

 

 

 

 

 

 

solder

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1–2 mm

(10 mm 38 in)

Slide the coupling ring down. Strip the cable jacket and soft solder.

Strip the cable as shown at left. Soft solder the center con- ductor.

solder solder Slide the connector body on and solder it.

Screw the coupling ring onto the connector body.

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Icom IC-R8500 Antenna connection Grounding, Using a long wire antenna for HF bands, TYPE-N Connector Installation Example

IC-R8500 specifications

The Icom IC-R8500 is a highly regarded general-purpose receiver that has made its mark among amateur radio enthusiasts and professionals alike. This versatile communication receiver is known for its wide frequency coverage, advanced features, and robust design, making it a valuable tool for various applications, including shortwave listening, public safety communication, and aircraft monitoring.

One of the standout features of the IC-R8500 is its extensive frequency coverage. It spans a range from 0.1 MHz to 3 GHz, allowing users to access a wide spectrum of signals. The receiver includes coverage of HF, VHF, UHF, and even microwave bands, making it suitable for listening to everything from amateur radio transmissions to satellite communications.

The receiver employs a high-performance double-conversion superheterodyne architecture, which contributes to its excellent sensitivity and selectivity. The advanced RF circuitry minimizes interference and enhances the clarity of received signals. Users can expect outstanding audio quality and a wide dynamic range, even in challenging reception conditions.

Digital Signal Processing (DSP) is another key technology incorporated into the IC-R8500. The DSP capabilities allow users to apply noise reduction and filtering techniques to improve the quality of the received audio. Features such as automatic notch filtering and IF filtering help eliminate unwanted noise, enhancing the listening experience.

The IC-R8500 is equipped with a large, easy-to-read LCD display that provides information on frequency, mode, signal strength, and other essential parameters. The user-friendly interface simplifies operation, allowing quick access to various settings and functions. Additionally, the receiver supports various modulation modes, including AM, FM, SSB, and CW, catering to different listening preferences.

For those seeking enhanced connectivity, the IC-R8500 offers multiple options, including an audio output jack, and external speaker connections. It also has a built-in memory function, allowing users to store and recall favorite frequencies easily. The receiver can be controlled via a computer interface, offering versatility for advanced users and programmers.

In summary, the Icom IC-R8500 stands out for its wide frequency range, superior sensitivity, and advanced features powered by DSP technology. Its robust construction and user-friendly design make it a favorite among communications enthusiasts seeking a reliable and versatile receiver for various applications. Whether for hobbyist listening or professional use, the IC-R8500 remains a top choice in the world of radio receivers.