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- T.A.P. Version 2.0 (C) 1989-1996
- (Triode Amplifier Program)
-
- FREEWARE
-
- Courtesy of KD9JQ
-
-
- T.A.P. Version 2.0 (Triode Amplifier Program) provides the Amateur with a new
- Tool in Designing Triode Power Tube Amplifiers for Grounded Grid Service.
- This Program should be considered as a designers aid only and does not represent
- all facets of High Power Amplifier design. It is left to the user to verify
- correct Filament Voltages and Currents for the frequency of operation, to verify
- the correct plate voltage and dissipations per operating class, and as well as
- the proper cooling and mounting methods recommended by the tube vendor. The user
- does not need to have to Plate/Grid-Voltage/Current Plots to use this program
- unless a new device data file is required.
-
- The following information will guide the designer with Menus and Prompts.
-
- Start:
-
- 1. Press <CR> to pull up the Library files of typical triodes.
-
- 2. Type in the file name (.TUB extension assumed) and press <CR>
-
- 3. A menu will pop up indicating 4 possible design selections or Exit.
-
- F1 will find IBdc, RL Given PO, VDC, VBmin
-
- F2 will find IBdc, PO Given RL, VBmin, VDC
-
- F3 will find VBmax, PO Given IBdc, RL, VBmin, VDC
-
- F4 will find VBmin, PO Given RL, IBdc, VDC
-
- F9 Exit "Ends Program"
-
- 4. A series of prompts will appear requesting input from the designer.
- Enter the requested information at this time. The program utilizes
- Data from the Tube Library File to simulate the Tube Characteristics
- at VBmin (Plate Voltage at full IB).
-
- VDC = DC Plate Voltage @ no load.
-
- Guideline;
- Plate voltage should not exceed
- VDC (Maximum rated) - (.5 * Vp-p Drive)
-
-
- VBmax = Maximum Instantaneous Plate Voltage at IB @ cutoff.
- Should not exceed VDC.
-
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- Page 2
-
- VMmin = Minimum Instantaneous Plate Voltage at Peak Plate Current
- ** Hint ** Use 10% +/- 5% of VB to start.
- Lower VMmin => higher Grid current, higher drive
- Higher VMmin => lower Grid current, lower drive
-
- Guideline;
- VKmax < .75 * VBmin where VKmax = Peak Grid Voltage
-
- VP = VBmax - VBmin (1/2 Plate Swing)
-
- IBdc = DC Plate Current at Full Power
-
- PO = Output Power Desired (Po to Load will reflect FeedThru Drive)
-
- RL = Plate Load in Ohms (Final Load reflects FeedThru Drive)
-
- FO = Operating Frequency (Mhz)
-
- N = Number of Tubes used in Parallel (Not for Push Pull)
-
- CLASS = C ( 165 Deg Conduction)
- B ( 180 Deg Conduction)
- AB1 ( 185 Deg Conduction
- AB2 (~191 Deg Conduction)
- USER (Conduction Angle or Bias)
-
- USER Option:
-
- You will be prompted for [A] Angle or [B] Bias.
-
- The Angle allows the user to select a particular conduction
- angle from 140 to 220 Degrees. The corresponding Bias voltage will be
- calculated.
-
- The Bias option allows you to enter a particular fixed voltage. The
- corresponding Conduction Angle will be calculated. This option is
- useful when using zero bias triodes. A bias of "0" volts must be
- entered as a small number such as .0001.
-
- 5. A list of the calculated Design parameters will now be displayed.
- Any exceeded values will flash red.
-
- 6. To obtain Input/Output Matching circuit data press either the up or
- down arrow keys.
-
- 7. A display of matching circuits for input and outputs is now shown.
- Input T or PI Matching circuit component values can be obtained by
- Toggling the TAB key.
-
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- Page 3
-
- VG = Peak Cath Voltage Swing
- IB = Peak Plate Current IB(DC) = IB/Kb
- IG = Peak Grid Current IG(DC) = IB/Kg
- CA = Conduction Angle (Radians)
- VK = Cathode Bias Voltage VK =(Cos(CA/2)*(VG+VBmin/U))+VDC/U)
- Kb = PI^2/CA (Radians) Kg is a function of VK/(VG+VK)
- Expected efficiency ~= (1 - (1/Kb)) * 100 %
- PDCinput = VDC * IBdc Po = VP^2/(2*RL)
- PDISS = PDC - Po
- N (efficiency) = Po/PDC * 100 %
- Po to Load = Po + Pfdthru where Pfdthru = (VG+VK)^2/(2*RB)
- PGDISS = (VG+VK)^2/(2*RG) Grid Dissipation
- RB = 2*(VG+VK)/IB RG = 2*(VG+VK)/IG
- RK = 2*(VG+VK)/(IB+IG) Parallel Real component of Input Impedance
- XP = -1 / (WO * CP)
- CP = Cath-Grid Capacitance.
- where WO = 2 * Pi * Fo
-
- Converting to Series
- RS = RP/((RK/XP)^2 + 1) XS = -RP*RS/XP
- Zin = SQR(RS^2+XS^2) Magnitude of Zin
- Phase Angle = 2*ATN(XS/(RS+Zin))
-
- PIN = (VG+VK)^2/(2*Zin)
-
- The Output is designed for a PI design with an additional C/L
- circuit for intermediate impedance step up Transformation. If only
- the PI circuit is desired, the user can input a new transformation
- Impedance equal to the Load (50 ohms). The Plate Tuning Capacitance
- has the RFC Plate Choke and Tube Capacitance reactance removed.
-
- Items 1 thru 8 can be changed by the user at this time.
- Select the Item number to change and enter the new value. Enter a
- Negative number when entering Inductance, and a Positive number for
- Capacitance. Only used for RFC's. <CR> to update screen to new
- values.
-
- Toggling the UP or Down Arrow Keys will alternately pop up the Data
- Display or Matching Circuits.
-
- 8. The center Menu allows for "Dynamic" design of the matching
- circuits. To use this option, you must have initially designed the
- amplifier at the low end of the Band of interest and at the highest
- expected output power with the F1 selection. Print out Data at
- this time.
-
- Press "D" and the program will prompt you for new power output level
- (Lowest) and Upper Frequency end of the Band. The screen will now
- display Matching circuit values required while maintaining constant
- inductor values. Loaded Q and capacitance values are recalculated.
- Print out the new Data at this time.
-
- MENU will return you to the main menu.
- FILE will return you to the .Tub Library.
- PRINT will output the Data to your Printer.
- QUIT will exit program.
-
-
- Page 4
-
- Note: The designer should account for drive and bias current
- equalization of parallel devices. If there is adequate grid and
- plate dissipation then the problem may not pose a problem at HF.
-
- Circuit component losses are not figured in to the Gain. Use of
- High Q components for low losses are required in high power
- amplifiers.
-
- Example:
- A QL of 12 to QU of 400 => (1-(QL/QU))*100% efficiency or .22dB Loss
- in the Tank Circuit. Subtract all Input & Output LC losses from
- calculated Gain.
-
-
- REFERENCES
-
- RADIO HANDBOOK 22ND ED By William I. Orr Section 7
-
- RCA TRANSMITTING TUBE TECHNICAL MANUAL TT-5 10-62 Pages 46 - 62
-
- CARE & FEEDING OF POWER GRID TUBES VARIAN 4TH PRINTING 1982
-