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Multicoupler ND-VHF-30 is a 30W band reject "notch" duplexer designed to allow a two way radio repeater (signal booster) to transmit and receive on the a single antenna with excellent TX/RX isolation.
This notch duplexer rejects the frequency unwanted on the port used - the port used for receive (RX) rejects the transmit (TX) signal and port used for transmit rejects the receive signal. This ensures there is no crosstalk between TX and RX and allows a repeater to use a single antenna.
Freq. Range*: 136-174 MHz
Freq. Split*: 4-15 MHz
Power: 30 W
Isolation: ≥ 75 dB
*Depends on model.
Technical Information
Please see the technical information for the Multicoupler ND-VHF-30 VHF Duplexer. For reference, we also include the technical information for the ND-UHF-30 UHF duplexer.
Frequency Range
Frequency Split
Bandwidth
Insertion Loss
Isolation
VSWR
Power Rating
Connector Type
Operating Temperature
Dimensions
ND-VHF-30
136-174 MHz
4-5, 5-6, 6-15 MHz
0.5 - 2 MHz
~ 1.5 dB
≥ 75 dB
~ 1.4:1
30 W
N-Type
-20℃ - +50℃
154x220x32mm (±0.5mm)
420-470 MHz
5-7, 7-12, 12-20 MHz
0.5 - 2 MHz
~ 1.5 dB
≥ 75 dB
~ 1.3:1
30 W
N-Type
-20℃ - +50℃
228x154x32mm (±0.5mm)
VNA Readings
These VNA readings for the Multicoupler ND-VHF-30 duplexer are taken with the VNA set to Trace Hold to get the minimum readings.
HIGH PORT
Above is the reject dB reading for the HIGH port, used for TX on VHF High Band.
LOW PORT
Above is the reject dB reading for the LOW port, used for RX on VHF High Band.
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