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| − | [[File:RF-Amp_Front.png]]
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| − | == RF Amplifier Features ==
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| − | * From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig]
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| − | ** Solid State Design for the Radio Amateur?
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| − | * +22 dB gain
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| − | * Input connectors: SMA or BNC
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| − | * 49x49mm card
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| − | * 4x 4-40 mounting holes
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| − | == RF Amplifier Design ==
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| − | === Schematic ===
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| − | [[file:RF_Amp_Schematic-4.PNG]]
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| − | === DC Operating Point ===
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| − | * Ice = 10 mA
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| − | * Ve = 0.1 * Vcc = 1.2V
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| − | === Input/Output Transformer ===
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| − | ==== FT37-43 Toroid ====
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| − | * [http://toroids.info/FT37-43.php FT37-43]
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| − | * Wideband Transformers 5 - 400 MHz
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| − | * Power Transformers 0.5 - 30 MHz
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| − | * 10 turns = 35uH
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| − | [[file:FT37-43_10_Turns.PNG]]
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| − | ==== Tracks ====
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| − | [[file:RF-Amp-tracks.PNG]]
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| − | ==== Input Transformer ====
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| − | ** Input Transformer (T1 on Charlie's - T2 on this board)
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| − | *** 50:75.8 Ohms = 1 : 1.23 turns ratio
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| − | **** 9 turns primary, 11 turns on secondary
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| − | [[file:RF-Amp-T2.PNG]]
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| − | ==== Output Transformer ====
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| − | ** Output transformer (T2 on Charlie's - T1 on this board)
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| − | *** 200:50 Ohms = 2:1 turns ratio
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| − | *** 10 turns primary (on transistor collector), 5 turns secondary (towards output)
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| − | [[file:RF-Amp-T1.PNG]]
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| − | == LT Spice Simulation ==
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| − | === Transformers ===
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| − | [[File:RF-AMP-LTSPICE_XFMRS.PNG]]
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| − | == Charlie Morris Schematics ==
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| − | * From [https://zl2ctm.blogspot.com/2020/11/go-qrp-portable-ssb-rig.html Charlie Morris' (ZL2CTM) Go QRP Portable SSB Rig]
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| − | === IF AMP ===
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| − | * From Charlie's notes
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| − | ** DC Operating Point = 10 mA
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| − | ** V(emitter resistor) = 1/10 Vcc = 1.2V
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| − | *** R(emitter resistor) = 1.2V/0.01A = 120 ohms
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| − | * Beta DC = geometric mean min/max beta at operating current
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| − | ** = sqrt(100*300) = 173
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| − | * Beta AC = gain bandwidth product divided by operating frequency
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| − | ** Assume operating frequency of 10 MHz (my IF is actually at 9 MHz)
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| − | ** = 300/10 = 30
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| − | * VCE = 0.7V
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| − | * V(emitter) = 1.2V
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| − | * V(base) = V(emitter) + VCE = 1.9V
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| − | * Assume current in biasing resistors = 10x current needed by DC beta
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| − | ** 10 mA in C-E, beta DC less = 10 mA/173 \
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| − | [[FILE:IF Amp_0046A.jpg]]
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| − | [[FILE:IF Amp_0046B.jpg]]
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| − | [[FILE:IF Amp_0046C.jpg]]
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| − | [[FILE:IF Amp_0047A.jpg]]
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| − | [[FILE:IF Amp_0047B.jpg]]
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| − | [[FILE:IF Amp_0047C.jpg]]
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| − | == Video ==
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| − | <video type="youtube">CHdtoupH2Vg</video>
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| − | <video type="youtube">YJTsWV2kzFY</video>
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| − | <video type="youtube">xPFzFhM0ojE</video>
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| − | == Assembly Sheet ==
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| − | * [[RF Amplifier Assembly Sheet]]
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