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Antenna Tunner Box
Antenna matching systems with a parallel resonant circuit and inductive coupling were once very good
post 12 Sep 2024
Antenna Transmatch tuner Links →
Homebrew C-L-C QRP Antenna Tuner
His is a C-L-C type tuner with a reflected power indicator. Tuning is done for minimum reflected power. Forward power indicator is omitted because I know the output power of my transceiver anyway
L-Match ATU
After much thought I decided to build a L-Match circuit but with flexibility to match a wide variety of situations.
Modifications to the Single Coil Z Match for 1.8 MHz
The original Z Match circuit modified to include 1.8 MHz. The addition of three fixed capacitors and a 4 position switch gives the whole load resistance range at 1.8MHz
Solar Powered Antenna Tuner
Once the tuner determines the frequency of the RF signal being transmitted, it stores the tuner settings in its non-volatile memory for use in future tuning events
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His is a C-L-C type tuner with a reflected power indicator. Tuning is done for minimum reflected power. Forward power indicator is omitted because I know the output power of my transceiver anyway
After much thought I decided to build a L-Match circuit but with flexibility to match a wide variety of situations.
The original Z Match circuit modified to include 1.8 MHz. The addition of three fixed capacitors and a 4 position switch gives the whole load resistance range at 1.8MHz
Once the tuner determines the frequency of the RF signal being transmitted, it stores the tuner settings in its non-volatile memory for use in future tuning events
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free