Transmatch QRP Antenna
This circuit is for a QRP low power antenna tuner, a.k.a. a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz
post 11 May 2023
Antenna Transmatch tuner Links →
T-match atu
500pf variable capacitors and a e roller inductor the variable capacitors with 3mm plate spacings are well capable of withstanding voltages of several kilo volts
Two versions of the SPC antenna tuner
The nominal values from the article are: C1, 200 pF; C2, 200 pF per section; L1, 28 microhenries, roller inductor
Using Auto-Tuners
When using an autotuner you donÂ’t necessarily have to use a resonant length of wire. In fact if you wish to use one for multiband operation it may be best to pick a length of wire which isnÂ’t resonant on any of the required frequencies
Z Match A Drop-Out Region
The Z match tuner can be resolved as a simple L network of series capacity and shunt inductance combined with an output coupling circuit
193
500pf variable capacitors and a e roller inductor the variable capacitors with 3mm plate spacings are well capable of withstanding voltages of several kilo volts
The nominal values from the article are: C1, 200 pF; C2, 200 pF per section; L1, 28 microhenries, roller inductor
When using an autotuner you donÂ’t necessarily have to use a resonant length of wire. In fact if you wish to use one for multiband operation it may be best to pick a length of wire which isnÂ’t resonant on any of the required frequencies
The Z match tuner can be resolved as a simple L network of series capacity and shunt inductance combined with an output coupling circuit
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