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CALCULATION OF RF LINEAR AMPLIFIER
by "RF Amplifier Developer 2001"
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Plate supply voltage DC (V):................................1500
Screen supply voltage (V):..................................400
Single-tone plate current (A):..............................0.3
Zero-signal plate current (A):..............................0.02
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Conduction angle,(deg):.....................................95.97
Anode current, pk.,(A):.....................................0.89
Anode current of the first harmonic, pk.,(A):...............0.456
Amplification at minimal residual voltage
on anode of a valve:........................................2.225
Factor of AC voltage on the anode of a valve:...............0.734
Amplitude of RF AC voltage generated
on the anode of a valve,(V):................................1101
Minimal residual voltage on the anode of a valve,(V):.......399
Peak voltage on anode, max.,(V):............................2601
Maximum oscillatory power on the anode of a valve,(W):......251.028
Average factor for SSB signal, under peak-factor,(p=4):.....0.35
Average oscillatory power on the anode of a valve
for SSB signal,(W):.........................................30.751
Maximum input power to the anode,(W):.......................450
Maximum efficiency of a valve:..............................0.558
Average efficiency of a valve for SSB signal:...............0.187
Average input power to the anode,(W):.......................164.444
Anode dissipation, max.,(W):................................198.972
Average anode dissipation,(W):..............................133.693
Anode dissipation under zero-signal plate current,(W):......30
Virtual resistance of an anode circuit of a valve,(ohm):....2414
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PARAMETERS FOR THE 2 HARMONIC
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Anode current of the 2 harmonic, pk.,(A):...................0.168
Maximum oscillatory power for 2 harmonic,(W):...............92.484
Virtual resistance for 2 harmonic,(ohm):....................6554
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PARAMETERS FOR THE 3 HARMONIC
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Anode current of the 3 harmonic, pk.,(A):...................0.026
Maximum oscillatory power for 3 harmonic,(W):...............14.313
Virtual resistance for 3 harmonic,(ohm):....................42346
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PI-NETWORK
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Input resistance to be matched, in
ohms:
2414
Load resistance to be matched, in
ohms:
50
Stray circuit capacitance, pF.:
20
Tube output capacitance, pF.:
8.5
Plate var. capacitor + capacitance for tuning, pF. min.:
20
Preferable Q - load
value:
12
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FRQ,(MHz):
1.85 3.6 7.05 10.12
14.15 18.1
21.2 24.9 28.6
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C inp.(pF):
336 149 53 22
20
20 20
20 20
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Ind.(uH):
21.18 10.88 5.56 3.87 2.08
1.28 0.94 0.68 0.52
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C out.(pF):
2063 1060
541 377 418 440
449 456 461
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Q load:
12 12
12
12 16.5 21.2 24.9
29.3 33.7
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CONSTRUCTION OF INDUCTOR
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Factor for influence of a metal chassis to inductor: 20%
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FRQ,(MHz):
1.85 3.6 7.05 10.12
14.15 18.1
21.2 24.9 28.6
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L1,(uH):
21.18 10.88 5.56 3.87 2.08
1.28 0.94
0.68 0.52
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L1,(uH)+20%:
25.42 13.06 6.67 4.64 2.5
1.54 1.13 0.82 0.62
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Diameter of L1,(mm): 48.5 48.5 48.5 48.5
40
40 40
40 40
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Diam. of wire,(mm): 2
2
2
2
4 4
4 4 4
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Step of turn L1,(mm): 3 3
3
3
6
6
6 6 6
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Nr.turns L1:
36.3 21.1 12.7
9.8 10.3
7.1 5.7 4.5 3.7
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Q unload:
89 110 131 142
197 199 197 195
195
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Efficiency:
0.87 0.89 0.91 0.92 0.92
0.89 0.87 0.85 0.83
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Power out,(W):
218 223 228 231
231 223
218 213 208
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Bandwidth,(kHz): 154 300 588
843 858
854 851
850 849
