Handmade ferrite choke improves EFHW/POTA performance
Key Questions
What performance does the handmade ferrite choke provide for EFHW/POTA antennas?
The DIY choke achieves less than 2:1 SWR on 10/15/20/40m bands, supporting 180 QSOs. It uses a Xiegu G90 UNUN on a T240-43 core for portable operations.
How was the ferrite choke tested and evaluated?
Testing involved a CMC test fixture and NanoVNA reviews to create a selection guide. Lab reproductions quantified mix and turns for optimal performance.
What future developments are planned for the POTA choke?
A POTA kit is planned, integrating with QRP TRX setups. Reviews of the XPA125B amp are also noted.
What field antennas are recommended alongside the choke?
A magnetic loop and linear-loaded monopole for hiking are highlighted. The monopole uses a 1-1.5uH coil with a polyvaricon for tuning around mid-range.
How does SWR relate to antenna performance in this context?
SWR under 2:1 indicates good matching, minimizing reflected power as calculable via tools like the SWR/Return Loss Calculator. This ensures efficient operation for ham radio antennas and feedlines.
DIY choke <2:1 SWR on 10/15/20/40m for 180 QSOs; CMC test fixture/NanoVNA reviews boost selection guide. Xiegu G90 UNUN on T240-43 core adds portable notes; lab repros, mix/turns quant, POTA kit planned with QRP TRX ties; XPA125B amp reviews noted; mag loop ad + linear-loaded monopole (1-1.5uH coil/polyvaricon) for hiking reinforce field antenna builds.