| Frequency |
Output 145.7125 MHz,
Input 145.1125 MHz |
| TX RX Split |
Minus 600 kHz Split (user's, split)
|
| Location |
Chelsfield, Kent. (close to Junction
4 of the M25) |
| Locator |
JO01BI or NGR TQ497643 |
| Station ID Morse |
GB7OK /C Port C "OK" for
Orpington, Kent. |
| Mode of Operation |
Digital Voice "DV" (6.25
kHz) |
| Type of Emission |
F1D (GMSK); F7W with ID-RP2C |
| Power |
25W ERP |
| Antenna |
Diamond X-300 Fixed Base Station
Vertical 2x5/8 @ 6.5dB |
| Antenna Height AGL |
9 Metres or 30 Feet above ground
level |
| Base of Mast ASL |
284 Metres or 600 Feet above sea
level |
| |
|
| Repeater Controller |
Icom RP2C controller |
| |
|
| Duplexer |
Wacom 4 Bp/Bs commercial (Coming
soon 5 AFL-140's) |
The hardware is based on the next generation digital amateur radio
system. The D-STAR system provides digitally modulated voice/data
communication and high-speed data access over the air. This project
has been developed in collaboration with JARL (Japan Amateur Radio
League) and is supported by the Japanese Telecommunications Administration.
D-STAR incorporates the power of digital voice and 1kbps data mode
on 2m, 70cm, and 23cm. The spectral efficiency, crystal clarity,
and the ability of repeating data and voice communications on a
single 6.25 kHz channel is something yet to be seen in any other
radio service!
The Icom is supplied with an two s"N" Type connector
for the transmitter and the receiver to allow easy connection to
the diplexer or feeder cables. also includes rear panel a RJ45 connector
that allow easy connection to external controller. All housed within
one 4RU equipment cabinet.
| Transmit Frequency |
Output 145.7125 MHz |
| RF Power Output |
23-30W (high)/2-3W (low) (Continuous
Duty Cycle) |
| Frequency Deviation |
Narrow-band + or - 2.4KHz |
| Oscillation System |
Direct PLL (Phase Locked Loop) Synthesizer
System |
| Transmission Speed |
4.8 kbps (Voice 2400 bps, FEC 1200
bps, data 952 bps) |
| Frequency Stability |
Within ±0.3 kHz (at 25?C;
+77?F) |
| Frequency Response |
5/6.25 kHz |
| Spurious Emissions |
Less than -60 dB |
| Receive Frequency |
Input 145.1125 MHz |
| 1st IF |
46.35 MHz |
| 2nd IF |
450 kHz |
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