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End Fed Half Wave Antenna Tuner
The End Fed Half Wave Antenna EFHWA is a popular antenna for portable use There are very few simpler antennas
post 28 Jan 2024
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20/11/10m.monoband end fed halfwave antenna
The vertical end fed half wave antenna is my choice for it’s easy to employ and it's a perfect DX antenna
Endfed antenna 40m-20m and 10m
This antenna is a 12m long multiband antenna for 40m, 20m and 10m. it has a 1:60 autotransformer with a single ft-140-43 core for 100w pep
A portable multi-band End-Fed Half Wave 40-10m
The antenna a portablemulti-band end-fed half wave EFHW40-10m with a 49:1 Unun
An End Fed Half Wave Antenna writing
As a rough guide, a capacitor of 50pf across a winding of say 30 turns is a starting point for 40m. Some experimenting with turns and tapping point is necessary. The coil former used was about 1/4 inches in diameter as found in old IF transformers
An End Fed Inverted Monoband Vee
An End Fed Inverted Monoband Vee has a low impedance point around 1/4 wave away from ground, and the multiples of 1/4 wave on the feed side
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The vertical end fed half wave antenna is my choice for it’s easy to employ and it's a perfect DX antenna
This antenna is a 12m long multiband antenna for 40m, 20m and 10m. it has a 1:60 autotransformer with a single ft-140-43 core for 100w pep
The antenna a portablemulti-band end-fed half wave EFHW40-10m with a 49:1 Unun
As a rough guide, a capacitor of 50pf across a winding of say 30 turns is a starting point for 40m. Some experimenting with turns and tapping point is necessary. The coil former used was about 1/4 inches in diameter as found in old IF transformers
An End Fed Inverted Monoband Vee has a low impedance point around 1/4 wave away from ground, and the multiples of 1/4 wave on the feed side
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
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground