Hits
Antenna tuner Experimental QRP hams
The primary winding of the transformer consists of 30 turns 0,9mm enameled wire
post 05 Dec 2024
Antenna Transmatch tuner Links →
Antenna tuner 150 watts
A tunner witha balun T200-6 should give a better Q but the T200-2 was in stock and gave me sufficient tuning range, the capacitors are radio types and can be used up to 150 Watts
Z-Match Portable Antenna Tuner
I built the Z-Match in about 3-4 days using available parts. decided I wanted to use my Z-Match for 7-21 Mhz operation so I adjusted the coil L1 to give me that range
50 MHz 6 Meter Tuner Circuits
After matching my antenna to a 1.0:1 SWR I measured the capacitor settings: 77pF on the TX side and 36pF on the antenna side
A QRP Transmatch ATU
The inductor, the tricky thing in matching units with variable inductance. For the body I found an old pill container with a diameter of 4cm. The coil is then wound on this with 60 windings of 1mm enameled copper wire
Z-Match Antenna for high performance
For most applications, a capacity of 350 pF for C1 and 2x230 pF for C2 is sufficient, if you want to cover the bands 10-80 m, an extension for 160 m will be presented later
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A tunner witha balun T200-6 should give a better Q but the T200-2 was in stock and gave me sufficient tuning range, the capacitors are radio types and can be used up to 150 Watts
I built the Z-Match in about 3-4 days using available parts. decided I wanted to use my Z-Match for 7-21 Mhz operation so I adjusted the coil L1 to give me that range
After matching my antenna to a 1.0:1 SWR I measured the capacitor settings: 77pF on the TX side and 36pF on the antenna side
The inductor, the tricky thing in matching units with variable inductance. For the body I found an old pill container with a diameter of 4cm. The coil is then wound on this with 60 windings of 1mm enameled copper wire
For most applications, a capacity of 350 pF for C1 and 2x230 pF for C2 is sufficient, if you want to cover the bands 10-80 m, an extension for 160 m will be presented later
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