Tuggle Tuner SchematicTuggle Tuner Calculator

Antenna/Ground

Series Loading
Resistance Rant Ω
Inductance Lant μH
Capacitance Cant pF

Tuner

Min Max Parallel
Antenna/ground Series Section Cgnd + pF
Tank Section Ctnk + pF
Tank Inductor Ltnk μH

Reset to Defaults.

Frequency 0 517 539 565 595 631 677 737 820 951 1204 2119 kHz
Bandwidth 0 9 9 10 10 10 11 11 12 13 13 14 kHz
Maximum Q 0 59 59 59 60 61 62 65 68 75 90 150
Frequency 1 3656 3758 3880 4029 4217 4462 4795 5280 6066 7629 13401 kHz
Closed← 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% →Open
Xant+load -1473 -1407 -1338 -1263 -1181 -1091 -988 -867 -717 -509 -109
Xtnk 2315 2302 2293 2292 2302 2328 2382 2484 2685 3153 5115
Xgnd -843 -894 -955 -1029 -1121 -1238 -1394 -1617 -1968 -2643 -5006

This calculator estimates the tuning response across the range of a dual-ganged variable capacitor. Please see the associated wiki entry, Tuggle Antenna Tuner, for more information.

Some Samples

References

Mike Tuggle (re)popularized the use of a dual-gang capacitor in the arrangement shown for crystal radio receivers. Though it is usually used as an antenna tuner in a double-tuned set, variations of this circuit can make a fine single-tuned radio.

 \|/                                   Ltnk             
  |                                 +--UUUU--+--------->
  |                                 |      ..|.......   
  |         Lant        Lload       |     /  |     /    
  +---VVV---UUUU---||---UUUU---||---+---||---+---||---+ 
      Rant         Cant        Cload|  /Ctnk |  /Cgnd | 
                                    |        |        | 
                                    +---||---+---||---+ 
                                        Ctnkp    Cgndp| 
                                                      | 
                                                     ---
                                                      - 

Tuggle Tuner ASCII Schematic

©2008 David E. Wagner II.

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