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Tuner Genius is electrically implemented as a pi‐network tuner with three variable elements; a series inductor
with two capacitors to ground: one at the input and the other at the output. A pi network is ideal for matching
the relatively low 50Ω impedance of a transmitter and relatively high and unknown impedances antenna
system present for a current operating frequency. Furthermore, because the matching circuit also forms a low‐
pass filter, it provides beneficial harmonic suppression beyond that provided by the exciter and amplifier.
The tuner is a system of discrete LC components which are switched into and out of the matching circuit by a
microcontroller. The combination of discrete L or C components determines each network element's value.
Each element can be one of 255 possible values. This highly granular stepped approach provides 255
(16,581,375) possible matching combinations.
4.1 Tune
When instructed by the operator, the microcontroller keys the transmitter and executes an algorithm that
quickly varies the value for each element of the matching network. For each value, the output of a directional
coupler is sampled and used to search for a target impedance match.
Once a match solution is found, the frequency and data necessary to recall the matching network's element
values are stored in a non‐volatile memory location. When the operator next transmits on a frequency within
10kHz of a stored solution, the values required to reconstitute the pi network element values are recalled and
applied to the circuit.
4.2 Transmit
The microcontroller samples the directional coupler to present accurate forward power and calculated SWR
during transmissions.
4.3 Receive
During receive, the tuner can optionally bypass the tuned matching circuit.
5 Features of the Tuner Genius XL
Input Power
Antenna Switching options:
Control:
RF Power:
Tuning:
Matching:
Frequency Ranges:
Copyright 2021 FlexRadio. All Rights Reserved.
+12 to +20VDC (XXXma)
SO2R (70dB input isolation)
1x3 Matrix
Windows application
1500W ICAS with headroom for 2000W (all modes)
Fully automatic and manual
Over 16.5 million possible solutions using C‐L‐C (Pi) matching circuit
First time solution time (2 to 12 seconds) – solution stored in memory
Next time solution time < 20ms – solution recalled from memory
20 to 200W input power required during tuning (20W recommended)
50‐ohms (nominal) input impedance
Up to 10:1 SWR (.5 to 5k‐ohms)
1.8MHz to 30MHz
50 MHz to 54MHz
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7 June 2021(FW:0.9.12, Utility: 0.9.12)
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