Difference between revisions of "RF-Amp"
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** Wideband Transformers 5 - 400 MHz | ** Wideband Transformers 5 - 400 MHz | ||
** Power Transformers 0.5 - 30 MHz | ** Power Transformers 0.5 - 30 MHz | ||
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==== Input Transformer ==== | ==== Input Transformer ==== | ||
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*** 200:50 Ohms = 2:1 turns ratio | *** 200:50 Ohms = 2:1 turns ratio | ||
*** 10 turns primary (on transistor collector), 5 turns secondary (towards output) | *** 10 turns primary (on transistor collector), 5 turns secondary (towards output) | ||
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=== Schematics === | === Schematics === | ||
Revision as of 09:17, 4 November 2021
Contents
RF Amplifier Features
- From Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig
- Solid State Design for the Radio Amateur?
- +22 dB gain
- Input connectors: SMA or BNC
- 49x49mm card
- 4x 4-40 mounting holes
RF Amplifier Design
DC operating point
- Ice = 10 mA
- Ve = 0.1 * Vcc = 1.2V
Input/Output Transformer
- FT37-43 toroids
- Wideband Transformers 5 - 400 MHz
- Power Transformers 0.5 - 30 MHz
Input Transformer
- Input Transformer (T1 on Charlie's - T2 on this board)
- 50:75.8 Ohms = 1 : 1.23 turns ratio
- 9 turns primary, 11 turns on secondary
- 50:75.8 Ohms = 1 : 1.23 turns ratio
- Input Transformer (T1 on Charlie's - T2 on this board)
Output Transformer
- Output transformer (T2 on Charlie's - T1 on this board)
- 200:50 Ohms = 2:1 turns ratio
- 10 turns primary (on transistor collector), 5 turns secondary (towards output)
- Output transformer (T2 on Charlie's - T1 on this board)
Schematics
LT Spice Simulation
Transformer 1.5 uH
Transformer 35 uH
Charlie Morris Schematics
IF AMP
Video
