Tube
parameters and components of Pi - networks
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RF LINEAR AMPLIFIER USING TWO GI-7B TRIODES by "RF Amplifier Developer 2001" Version 1.5 Plate supply voltage DC,(V):................................2500 Grid voltage max.,(V):......................................80 Single-tone plate current,(A):..............................0.7 Zero-signal plate current,(A):..............................0.05 _________________________________________________________________ Anode current conduction angle,(deg):.......................96.41 Anode current, pk.,(A):.....................................2.069 Anode current of the first harmonic, pk.,(A):...............1.063 Amplification of the valve under minimal residual voltege:..8.621 AC voltage factor of the valve anode:.......................0.904 Amplitude of RF AC voltage generated on the valve anode,(V):.....................................2260 Minimum residual voltage of the valve anode,(V):............240 Peak voltage of the anode, max.,(V):........................4760 Maximum produced CW power on the valve anode,(W):...........1201.2 Maximum produced SSB peak power on the valve anode,(W):.....1823.3 Maximum produced SSB PEP power on the valve anode,(W):......2402.4 Factor for SSB signal, under peak-factor,(p=4):.............0.35 Average produced power of the valve anode for SSB signal,(W):.........................................147.147 Maximum input power to the valve anode,(W):.................1750 Maximum efficiency of the valve:............................0.686 Average efficiency of the valve for SSB signal:.............0.23 Average input power to the valve anode,(W):.................639.77 Valve anode dissipation, max.,(W):..........................548.8 Average valve anode dissipation,(W):........................492.6 Anode dissipation under zero-signal plate current,(W):......125 Virtual resistance of the valve anode circuit,(ohm):........2126 _________________________________________________________________ PARAMETERS FOR THE 2 HARMONIC Anode current of the 2 harmonic, pk.,(A):...................0.388 Maximum produced power for 2 harmonic,(W):..................438.44 Virtual anode resistance for 2 harmonic,(ohm):..............5825 _________________________________________________________________ PARAMETERS FOR THE 3 HARMONIC Anode current of the 3 harmonic, pk.,(A):...................0.065 Maximum produced power for 3 harmonic,(W):..................73.45 Virtual anode resistance for 3 harmonic,(ohm):..............34769
__________________________________________________________________ OUTPUT PI-NETWORK Input resistance to be matched, in ohms:.....................2126 Load resistance to be matched, in ohms:......................50 Stray circuit capacitance, pF.:..............................20 Tube output capacitance, pF.:................................10 Plate var. capacitor + capacitance for tuning, pF. min.:.....35 Q - load value:..............................................12 FRQ,(MHz): 1.85 3.6 7.05 10.12 14.15 18.1 21.2 24.9 28.6 ------------------------------------------------------------------ C inp.(pF): 368 157 49 35 35 35 35 35 35 ------------------------------------------------------------------ Ind.(uH): 19.03 9.78 4.99 2.8 1.45 0.89 0.65 0.47 0.36 ------------------------------------------------------------------ C out.(pF): 2251 1157 591 571 612 627 632 637 640 ------------------------------------------------------------------ Q load real:12 12 12 15.3 21.6 27.7 32.4 38.1 43.8 ___________________________________________________________________________ OUTPUT FILTER USING SEPARATED INDUCTORS FOR EACH BAND Pi-network Influence factor of metal chassis to inductor: 20% FRQ,(MHz): 1.85 3.6 7.05 10.12 14.15 18.1 21.2 24.9 28.6 --------------------------------------------------------------------------- L1,(uH): 19.03 9.78 4.99 2.8 1.45 0.89 0.65 0.47 0.36 --------------------------------------------------------------------------- L1,(uH)+20%: 22.84 11.7 5.99 3.36 1.74 1.07 0.78 0.56 0.43 --------------------------------------------------------------------------- L1-core diam.,(mm): 50 50 50 50 40 40 40 40 40 --------------------------------------------------------------------------- L1-wire diam.,(mm): 1.5 1.5 1.5 1.5 6 6 6 6 6 --------------------------------------------------------------------------- L1-turn spacing,(mm): 3 3 3 3 8 8 8 8 8 --------------------------------------------------------------------------- L1-number of turns: 32.2 18.9 11.5 7.7 8.7 5.9 4.7 3.7 3.1 --------------------------------------------------------------------------- Q unload: 67 81 96 96 233 239 237 236 231 --------------------------------------------------------------------------- Efficiency: 0.82 0.85 0.87 0.84 0.91 0.88 0.86 0.84 0.81 --------------------------------------------------------------------------- Power CW out,(W): 985 1021 1045 1009 1093 1057 1033 1009 973 --------------------------------------------------------------------------- Bandwidth,(kHz): 154 300 588 661 655 653 654 654 653
___________________________________________________________________________ OUTPUT FILTERS USING SERIES CONNECTED INDUCTORS Pi-network Influence factor of metal chassis to inductor: 20% ___________________________________________________________________________ 160m-30m BANDS --------------------------------------------------------------------------- FRQ,(MHz): 1.85 3.6 7.05 10.12 --------------------------------------------------------------------------- L1,(uH): 17.58 8.33 3.54 1.35 --------------------------------------------------------------------------- L1,(uH)+20%: 21.1 10 4.25 1.62 --------------------------------------------------------------------------- Coil core diameter,(mm): 50 50 50 50 --------------------------------------------------------------------------- Diameter of wire,(mm): 6 6 6 6 --------------------------------------------------------------------------- Turn spacing,(mm): 8 8 8 8 --------------------------------------------------------------------------- Number of turns: 56.9 28.4 13.5 6.3 ___________________________________________________________________________ 20m-12m BANDS 10m BAND --------------------------------------------------------------------------- FRQ,(MHz): 14.15 18.1 21.2 24.9 29.7 ----------------------------------------------------- ------------------- L1,(uH): 1.09 0.53 0.29 0.11 0.36 ----------------------------------------------------- ------------------- L1,(uH)+20%: 1.31 0.64 0.35 0.13 0.43 ----------------------------------------------------- ------------------- Coil core diameter,(mm): 40 40 40 40 40 ----------------------------------------------------- ------------------- Diameter of wire,(mm): 6 6 6 6 6 ----------------------------------------------------- ------------------- Turn spacing,(mm): 8 8 8 8 8 ----------------------------------------------------- ------------------- Number of turns: 6.9 4 2.7 1.5 3.1 ___________________________________________________________________________ AMPLIFIER INPUT PI-NETWORK Input resistance to be matched, in ohms:......................50 Load resistance to be matched, in ohms:.......................43 Stray circuit capacitance, pF.:...............................20 Tubes input capacitance, pF.:.................................24 Q - load value:...............................................3 FRQ,(MHz): 1.85 3.6 7.05 10.12 14.15 18.1 21.2 24.9 28.6 --------------------------------------------------------------------------- C inp.(pF): 2677 1355 670 454 312 234 193 158 132 --------------------------------------------------------------------------- Ind.(uH): 3.69 1.89 0.97 0.67 0.48 0.38 0.32 0.27 0.24 --------------------------------------------------------------------------- C out.(pF): 2838 1458 745 519 371 290 248 211 184 --------------------------------------------------------------------------- Q load real:3 3 3 3 3 3 3 3 3 ___________________________________________________________________________ INPUT FILTER USING SEPARATED INDUCTORS FOR EACH BAND Pi-network Influence factor of metal chassis to inductor: 20% FRQ,(MHz): 1.85 3.6 7.05 10.12 14.15 18.1 21.2 24.9 28.6 --------------------------------------------------------------------------- L1,(uH): 3.69 1.89 0.97 0.67 0.48 0.38 0.32 0.27 0.24 --------------------------------------------------------------------------- L1,(uH)+20%: 4.43 2.27 1.16 0.8 0.58 0.46 0.38 0.32 0.29 --------------------------------------------------------------------------- L1-core diam.,(mm): 20 20 20 20 20 20 20 20 20 --------------------------------------------------------------------------- L1-wire diam.,(mm): 1 1 1 1 1 1 1 1 1 --------------------------------------------------------------------------- L1-turn spacing,(mm): 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 --------------------------------------------------------------------------- L1-number of turns: 20 11.9 7.5 5.8 4.7 4.1 3.7 3.3 3.1 --------------------------------------------------------------------------- Q unload: 34 41 47 50 52 53 54 55 56 --------------------------------------------------------------------------- Efficiency: 0.91 0.93 0.94 0.94 0.94 0.94 0.94 0.95 0.95 --------------------------------------------------------------------------- Bandwidth,(kHz): 617 1200 2350 3373 4717 6033 7067 8300 9533
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You could see, if you use this tube for SSB operation only,
if for CW and digital operation, according:
If you will load power of second and third harmonics to dummy load by high-pass filter,
You could improve efficiency of Pi-network and output power by changing inductor parameters |
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This amplifier is built by Leonid EW1DS