December Is Coming — And So Are the Deals!
Black Friday and Christmas are the season of giving — so this year, we’re giving BIG.
For every order OF 4O3A PRODUCTS over $4000 AUD, you’ll receive an exclusive December Gift Bundle featuring our premium NC1 Headphones and the professional MC1 External Microphone boom — absolutely FREE!
The NC1 delivers exceptional performance with top-quality HiFi audio, advanced noise cancellation, Bluetooth connectivity, and a built-in mic for crystal-clear communication. Perfect for immersive listening or focused work.
The MC1 is a high-grade external microphone designed especially for radio operations — deploy it whenever precision audio matters most.
How to Get Your December Gift:
Simply make your purchase directly with Comtek Radio from November 24th to December 31st. No codes. No hassle. Just premium gifts with your order.
Don’t miss out — upgrade your station and enjoy the sound of December savings!
The 4O3A High Power HF Triplexer System Enables A Single Triband 20m/15m/10m Antenna (typically a Yagi) Fed With A Single Coaxial Feedline,To Be Used By Three Stations Running 4.5 kW simultaneously.
Game changer
Truly a “game changer” for SO2R and multi-operator contest stations, DXpeditions and Field Day groups. The 4O3A Signature Series Triplexer System eliminates the need for separate monoband Yagis on the 20m, 15m and 10m bands. Three operators, three stations and three amps but only one feedline and one antenna!
How to create triplexer system?
The 4O3A HF Triplexer Systems uses a high power Combiner HFC4500, which connects to a triband 20m/15m/10m antenna, such as the great new Force 12 XR3 Multi-Mono Yagi, and has ports for 20m, 15m and 10m. Each of these ports much be connected to a 4O3A Series S Bandpass Filter, the Combiner is not intended to be used by itself.
Benefits
When analyzing a 4O3A Triplexer System investment bear in mind the savings in antennas, towers, feedlines and maintenance that will accrue. It’s worth noting that Mr. 4O3A himself, Ranko Boca, replaced many of the rotatable monoband Yagis at his famed mountaintop contest station with tribanders set in fixed directions feeding Triplexer Systems. When you make north of 50,000 contest QSOs a year you learn what works (and what doesn’t)
Once you have combiner, system is flexible, as you can create triplexer, diplexer, or use filters separately if you have monoband antennas.
| HFC4500 without filters connected | |
| Input ports: | 20M, 15M and10M |
| Input power per port: | 4500 W |
| Insertion loss: | 0.10 dB on 20M 0.10 db on 15M 0.15 dB on 10M |
| Connectors: | SO-239 or N |
| Dimensions: | 55cm (W) x 12 cm (D) x 12 cm (H) |
| Weight: | 2.8 kg |
| Cooling: | Optional |
| Attenuation in between ports with filters connected | |
| Input 20M: | 15M - min 87dB 10M - 120 dB 20M - 104 dB |
| Input 15M: | 20M - 104 dB 10M - min 72 dB |
| Input 10M: | 20M > 120 dB 15M - min 72 dB |
| RX IMD level in worse case (for 1600W per port): | -10 dBm |
| RX IMD level in worse case (for 3200W per port): | -7 dBM |
This product will be in store around the 15th December, 2025
