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EFHWA tuner
Un tipo un balun 1:7 oppure 1:8 per fronteggiare gli ohm presenti ai vertici della nostra antenna, quindi 3 giri di avvolgimento primario e 21 o 22 di secondario andranno bene. per quanto riguarda il ROS non salgo mai sopra 1.6-1.8
post 01 May 2024
Antenna End Fed Links →
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
PIC-Keyer This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
RF Inductance Calculator Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any
Voice Recorder Gestito dall'integrato in questione ed offre la possibilità di registrare più messaggi per una durata massima di un minuto con buona fedeltà di riproduzione