Avantalk
Avantalk 2 in 1 Accessories VHF 136-174MHz 30W Duplexer 156/163MHz N Female
VHF duplexer covering 136-174 MHz with 30 W power handling, pre-tuned to 156/163 MHz and fitted with N Female connectors
- Factory pre-tuned to 156/163 MHz for instant repeater setup
- User-tunable across 136-174 MHz with standard RF tools
- Handles 30 W continuous power for reliable base-station operation
- >80 dB isolation and suppression keeps channels clean
- 50 Ω impedance with N Female connectors fits standard radio gear
Ready-to-use VHF duplexer for repeater builders
The Avantalk 2 in 1 Accessories duplexer arrives pre-tuned to 156MHz low and 163MHz high frequencies with N female connectors. It handles up to 30W input across the 136-174MHz range and provides 80dB isolation and suppression at 50 ohm impedance. The unit operates from -25 to +55 degrees Celsius and ships as a single piece.
Installation requires test equipment
Setting custom frequencies demands a three-port network analyzer, dummy load with N male connector, two RF cables, a slotted screwdriver and a spanner. The six screw poles on the duplexer are turned while monitoring the analyzer to reach the desired frequencies. Without these tools and RF measurement knowledge the unit cannot be re-tuned and must stay at the factory settings.
Verify frequency plan
The factory defaults are 156MHz and 163MHz with N female ports; any other frequency pair or connector type must be requested before purchase. Ensure your repeater design works within the 136-174MHz band, 30W power limit and 50 ohm system impedance. The duplexer is not suitable for bands outside this range or for systems requiring different connector genders.
Highlights
- Factory pre-tuned to 156/163 MHz for instant repeater setup
- User-tunable across 136-174 MHz with standard RF tools
- Handles 30 W continuous power for reliable base-station operation
- >80 dB isolation and suppression keeps channels clean
- 50 Ω impedance with N Female connectors fits standard radio gear
Specifications
No published specifications for this item yet.
Questions about this item
How can I confirm the duplexer is working correctly after installation?
Connect a three-port network analyzer with N male dummy load and RF cables, then verify isolation loss reaches 80dB and suppression exceeds 80dB at the tuned frequencies.
What comes in the package and what extra items are needed for tuning?
The box includes one duplexer; tuning requires a three-port network analyzer, N male dummy load, two RF cables, slotted screwdriver and spanner.
Should I choose the factory-set 156/163MHz version or retune it within the 136-174MHz range?
Use the pre-tuned 156MHz low and 163MHz high frequencies for immediate repeater deployment; retune only if your system needs different frequencies inside the 136-174MHz band.
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