Difference between revisions of "RF-Amp"
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[[File:RF-Amp_Front.png]] | [[File:RF-Amp_Front.png]] | ||
| − | == RF Amplifier == | + | == RF Amplifier Features == |
* From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig] | * From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig] | ||
** Solid State Design for the Radio Amateur? | ** Solid State Design for the Radio Amateur? | ||
* +22 dB gain | * +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 === | ||
| + | |||
* [http://toroids.info/FT37-43.php FT37-43] toroids | * [http://toroids.info/FT37-43.php FT37-43] toroids | ||
** Wideband Transformers 5 - 400 MHz | ** Wideband Transformers 5 - 400 MHz | ||
** Power Transformers 0.5 - 30 MHz | ** Power Transformers 0.5 - 30 MHz | ||
| + | |||
| + | ==== Input Transformer ==== | ||
| + | |||
** Input Transformer (T1 on Charlie's - T2 on this board) | ** Input Transformer (T1 on Charlie's - T2 on this board) | ||
*** 50:75.8 Ohms = 1 : 1.23 turns ratio | *** 50:75.8 Ohms = 1 : 1.23 turns ratio | ||
| + | **** 9 turns primary, 11 turns on secondary | ||
| + | |||
| + | === Output Transformer === | ||
| + | |||
** Output transformer (T2 on Charlie's - T1 on this board) | ** Output transformer (T2 on Charlie's - T1 on this board) | ||
*** 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) |
| − | ** | + | |
| − | + | === Inductor Values === | |
| − | * | + | |
| + | * Value: FT37-43 10 Turns | ||
| + | |||
| + | [[file:FT37-43_10_Turns.PNG]] | ||
=== Schematics === | === Schematics === | ||
| Line 22: | Line 45: | ||
[[file:RF_Amp_Schematic-4.PNG]] | [[file:RF_Amp_Schematic-4.PNG]] | ||
| − | + | == LT Spice Simulation == | |
| + | |||
| + | === Transformer 1.5 uH === | ||
[[File:RF-AMP-LTSPICE.PNG]] | [[File:RF-AMP-LTSPICE.PNG]] | ||
| + | |||
| + | === Transformer 35 uH === | ||
| + | |||
| + | [[File:RF-AMP-LTSPICE_35uH.PNG]] | ||
== Charlie Morris Schematics == | == Charlie Morris Schematics == | ||
Revision as of 09:15, 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)
Inductor Values
- Value: FT37-43 10 Turns
Schematics
LT Spice Simulation
Transformer 1.5 uH
Transformer 35 uH
Charlie Morris Schematics
IF AMP
Video
