15
Interference
Because the 1.4GHz frequency band is an unlicensed public access bands, there is no
control on other users. It is therefore possible that another user could be operating on the
same frequency in your area. If this is suspected, turn off the transmitter and check that the
LED on the receiver is RED and does not flicker GREEN. Also check the monitor, which
should be clear of any moving patterns, ghosting etc.
If there are other users it may be possible to avoid interference by repositioning the
antenna. A directional antenna such as a Yagi may also reduce the effect.
Fault Finding
Problem
Solution
No LED's illuminated Applies to Tx and Rx
units)
Check 12V power supply. The RED LED
should light to indicate 'power on'.
Venetian blind effect
Incorrect voltage from power supply.
Should be 12V
Low or no signal strength on VRX
Check that the VTX is transmitting:
RED LED: power on - not transmitting
GREEN LED - transmitting
Snowy or grainy picture
Weak signal. Check number of GREEN
LED's on VRX unit. See pages 5 and 13
regarding antenna height and location.
Picture rolling or tearing
Reflections. See page 14
Check output voltage from camera. it
should be nominally 1V p-p
16
Radio Data Technology Ltd
10-11 Taber Place Crittall Road Witham Essex CM8 3YP England
Telephone: 0044 (0) 1376 501255 Telefax: 0044 (0) 1376 501312
Email: sales@radiodata.co.uk URL: www.radiodata.co.uk
A member of the CML Microsystems Plc group
Specifications
General
Video Input
Video Output
Pre-emphasis
Operating voltage
Protection
Current consumption:
VTX2400
VRX2400
Antenna connector
Power connector
Indicators:
Power
Received Signal
1 Vp-p into 75W BNC
1 Vp-p into 75W BNC
CCIR PAL 405-1
10-15 V DC
Reverse Polarity
450mA
250mA
50 TNC
2.1mm jack
RED
GREEN
Radio
Frequency
Frequency stability
RF Power Output
Local oscillator
Modulation type
Modulation bandwidth
Good signal threshold
Mechanical
Dimensions
Weight
Enclosure Material
Environmental
Operating temperature
Storage temperature
1394MHz
+/- 40KHz
500mW
PLL Synthesized
FM
4.5MHz
-80dBm
125x62x30mm
240g
Extruded aluminium
-10 to +55°C
-25 to +85°C
Radio Modem
Frequency Range 406-470MHz* Adj. Channel Rejection
-70dB
Channel Spacing 25KHz RSSI Threshold Level -105dBm 16k
No. of Channels 32 -110dBm at 8k
Transmitter Max Bit Rate 16kbps
RF Power Output 50-500mW (4 steps) Modulation GMSK
Adj. Channel Power
-37dBm Interface Baud Rate 150-19.2 Kbaud
Freq. Tolerance +/- 1KHz Parity Odd, Even, None
FM Deviation +/- 3.5KHz Power Consumption at 240V
Receiver Transmitter at
500mW
7.2W
RF Sensitivity -110dBm for 10BER Receiver 4.2W
Intermodulation -70dB
SE Version SED Version
Height 230mm Height 280mm
Width 88mm Width 180mm
Depth 80mm Depth 120mm
Weight 800g Weight 2800g
Enclosure
Enclosure
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