This antenna is an excellent choice for an efficient, mid Power End Fed Half Wave (EFHW) for your home QTH where you need an SO-239 coax connector.
This antenna is built using our in-house designed PCB, with double side tracks. We use a single Fair-Rite 2643251002 core, 56:1 winding, 3kv 100PF TDK capacitor and all stainless-steel components. The antenna is built to last.
We can supply the antenna as a transformer only, or with 80m or 40m band antenna wire options.
Select 80m band option to resonate on 80m, 40m, 20m, 15, and 10m with no ATU.
You can also use the antenna on 30m, 17m and 12m bands, although you may need to use an ATU.
Select 40m band option to resonate on 40m, 20m, 15, and 10m with no ATU. You can also use the antenna on 30m, 17m and 12m bands, although you will need to use an ATU.
Antenna details
Custom PCB
Transmit power rated at 300w SSB 150w CW/DATA
Highly efficient 56:1 transformer, great option for the 15m to 10m bands
Genuine single FAIR-RITE 2643251002 core
SO239 Socket
Heavy duty insulator
All stainless-steel fittings
Enclosed in an IP65 ABS GREY enclosure with a small hole in the bottom to help with any condensation
Enclosure has several mounting points
Please review the Efficiency sweep and an SWR sweep with a 2.5k resister across antenna and earth connections. If you are familiar with EFHW designs the sweeps will give you some insight into how the antenna will work.
This transformer uses a 2643251002 core which is highly efficient from 80m-10m at over 90% efficient at 10m band, 90% from 80-20m. This has been measured using a NonoVNA with back to back transformers using our custom PCB.
Lastly, there is an SWR Sweep of this antenna setup for 40m-10m band as an inverted L with a compensation coil 2m from the end of the antenna, the coil helps pull 20m to 10m bands into resonance. This gives a very low SWR for 40m, 20m, 15m & 10m bands.
Your results may vary depending on the location of your antenna and orientation of the antenna wire.
Note
We supply antenna wire longer than needed. Therefore you will need to trim the antenna wire to bring the antenna to resonance.
Always check your SWR before using any antenna. An SWR of more than 1.5:1 may damage your tranceiver.