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| Frequency |
Output 430.900 MHz,
Input 438.500 MHz |
| TX RX Split |
Plus 7.6 Mhz Split |
| Location |
Chelsfield, Kent. J4 M25 |
| Locator |
JO01BI or NGR TQ497643 |
| CTCSS |
Tone "D" 82.5hz (CTCSS
access only) |
| Station ID Morse |
GB3OK D sent interval 15 minutes
at 18 words per minute "OK" for Orpington, Kent borders. |
| Mode of Operation |
Wide-Band FM (25 kHz) |
| Timeout |
3mins, The time-out will be indicated
by a “beeping” tone |
| Hang Time |
6sec, To re-accessed with a carrier
supporting a proper CTCSS tone and speech |
| Anti-Kerchunker |
2sec keep weak signals from chattering
repeater |
| Power |
25W ERP |
| Antenna |
Diamond X-300 Fixed Base Station
Vertical 5x5/8 @ 9dB |
| Antenna Height AGL |
8 Metres or 27 Feet above ground
level |
| Base of Mast ASL |
284 Metres or 600 Feet above sea
level |
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| Repeater Controller |
Zetron 38 |
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| Duplexer |
Procom UHF duplexer - Model DPF70/6 |
The hardware is based on modified Nokia BSR450 UHF Repeater Base
Station, transceiver & receiver comprise of separate modules
& the PA Unit all enclosed within their own die cast housing,
and the PA is directly mounted on the large rear heat-sink. The
RF Power Output is 1 - 40 Watts on a continuous duty basis.
The Nokia BSR450 is supplied with an "N" Type connector
for the transmitter, and a BNC connector for the receiver to allow
easy connection to the diplexer or feeder cables. The rear panel
includes a 9 and 25 way D sub connector that allow easy connection
to external accessories such as other radios, control equipment
or shared tone panel. All housed within one 4RU equipment cabinet.
| Station Mode |
Duplex Base Station
Repeater |
| Duplex Tx-Rx |
Frequency Separation 0.5 MHz Minimum |
| Antenna Impedance |
50 ohms unbalanced |
| Duty Cycle |
Continuous |
| Temperatures |
-30’C to +80C |
| Transmit Frequency |
Output 430.900 MHz |
| RF Power Output |
Minimum 1Watt Maximum 40Watts (Continuous
Duty Cycle) |
| Frequency Deviation |
Wide-Band + or - 2.4KHz |
| Oscillation System |
Direct PLL Synthesizer System |
| Type of Crystal Unit |
TCXO |
| Frequency Stability |
+ or - 0.0005% with Standard TCXO,
+ or - 0.0002 |
| Frequency Response |
Within +1, -3db of 6db/octave pre-emphasis
from 0.3 to 3kHz, 1khz reference |
| Signal to Noise Ratio |
More then 50dB at 1kHz 70% Modulation |
| Receive Frequency |
Input 438.500 MHz |
| Receiver Type |
Double Conversion Super Heterodyne |
| Intermediate Frequency |
1st IF 21.6MHz, 2nd IF 455kHz |
| Frequency Stability |
+ or - 0.0005% with Standard TCXO,
+ or - 0.0002 |
| Sensitivity |
Less than 0.5uV for 20dB noise quieting,
Less than 0.35uV for 12dB SINAD |
| Squelch Sensitivity |
Less than 0.25uV |
| Modulation Acceptance |
+ or - 7.0kHz |
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The Zetron Model 38A is a flexible repeater panel that provides
individualized repeater service interface between BSR450 Repeater
Base Stations
The Model 38A Logic controller providing all the functions that
can easily be customized from 50 CTCSS encode/decode, repeat audio
processing, Automatic morse code station identification , courtesy
beeps and tail bips and all timers from PC from the front RS-232
9 way serial port.
| Connections |
Rx audio, Tx key, CTCSS
/ DCS encode, Tx audio (mic), 12 VAC or DC power, ground. Optional
carrier detect, alarm input and aux output. |
| Rx input Impedance |
50 K? AC coupled. For connection
to unsquelched discriminator audio. |
| CTCSS / DCS Level |
0 to 4 Volts p-p. Impedance: Less
than 1 K? AC coupled. |
| Transmitter Type |
Direct FM, or phase modulation.
Flat or de-emphasized CTCSS encode. |
| Carrier Detect |
Internal noise detector or external
carrier detect input. External input threshold adjustable 0
to 7 VDC. |
| Adjustments |
Four adjustments from rear panel:
Rx input gain, CTCSS / DCS encode gain, Tx audio output gain,
and carrier detect threshold. |
| Configuration |
Eight switches on rear panel: Rx
audio gain high/low, repeat audio flat/de-emphasized, encode
gain high/low, encode flat/de emphasized, tx audio gain high/low,
COR source internal/external, COR polarity positive/negative,
COR pull up on/off |
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Transceiver & receiver
comprise of separate modules all enclosed within their own die
cast housing modules on the top side of the base station. |
| TX and RX Modules |
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Transmitter and receiver
lids removed from the modules top left main double conversion
super heterodyne receiver unit VCO/Direct PLL synthesizer
system., on the right main transmitter unit VCO\Direct PLL
synthesizer system and transmitter driver. |
| TX and RX Modules |
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Logic control module
on the under side of the base station which is overall interconnections
of transmitter, receiver and PA modules. |
| Logic Control Module |
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UHF 40 watt PA module
comprise of separate modules enclosed within their own die cast
housing at the rear of the base station. |
| PA and RX Module |
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UHF continuous duty
basis 40 watt PA module with lid removed from the module rear
of the base station. |
| PA Module |
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Procom Duplexer DPF70/6
is terminated with N-Type female connectors on Antenna, HI and
LO jacks.
Frequency Range 406-470 MHz
Continuous Input power 50 watts
Insertion Loss TX-ANT and ANT-RX, <1,2dB
TX Noise Rejection >85dB
Duplex spacing DPF70/6-5/7 = 5-7 MHz |
| The Duplexer |
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The Low Noise Amplifier
for 432 MHz band this special device and its unique circuit
design it provides unequalled performance with weak signal.
Selective Gain 20 dB preamplifier included double helical
band-pass filter with low noise figure and high gain |
| Low Noise Amplifier |
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| Colour Key |
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RMC Computer Generated
Predicted Coverage |
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50% Mobile |
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90% Hand Portable |
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