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Multiband antennas fed with coaxial cable such as the G5RV, ZS6BKW, Multiband EndFed, FD3, FD4, (Windom antenna) etc. tend to have perfect impedance on some bands and slightly off on others. This depends, for example, on the antenna height, soil type and objects near the antenna.
I decided to build a homebrew antenna tuner because I needed a passive pre-selector network to match an experimental end-fed wire antenna to my QS1R SDR receiver. Please Note: In the last version of my modified FRI-Match (diagram above), I replaced the 470 pf variable capacitors with 500 pf.
HF Kits offers you DIY kits and spare parts for ham radio amateurs. You will find here antenna, Balun, traps, endfed or transformer DIY kits and parts.
25 kwi 2024 · Download the best SDR software and plugins for Airspy, RTL-SDR dongle and many other radios!
using it for QRP work in the HF Spectrum working on 5 Watts or less (generally less). If there are some limitations or further concerns, I will list them in this document. This “kit” is not overly complex, but it is frustratingly fiddly, and there are
A small HF antenna tuner project for qrp operations. Includes circuit diagrams pictures and test results by GW4ALG. This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24).
Antenna Tuner, Automatic, for Icom/Kenwood Radios with 4-Pin Tuner Socket, HF+6m, 1.8-54MHz, 200W PEP, 100W Digital, Icom mAT-CI Cable Included, Each. Part Number: MTU-MAT-M200. 4.0 out of 5 stars
