Difference between revisions of "Kits and Parts Universal Wideband Small Signal RF Amplifier"

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=== 1-100 MHz Sweep ===
 
=== 1-100 MHz Sweep ===
−
 
−
[[file:K&P__RF_AMP_NanoVNA_1MHz-100MHz_S21-Gain.PNG]]
 
  
 
* 20 dB gain at 80 MHz
 
* 20 dB gain at 80 MHz
  
 
[[file:K&P_RF_AMP_NanoVNA_1MHz-100MHz_at3Points.PNG]]
 
[[file:K&P_RF_AMP_NanoVNA_1MHz-100MHz_at3Points.PNG]]
 +
 +
[[file:K&P__RF_AMP_NanoVNA_1MHz-100MHz_S21-Gain.PNG]]
  
 
== References ==
 
== References ==

Revision as of 15:46, 9 October 2021

Rfamp1.4.jpg

Specs

Schematic

Rfampsch1.4.png

Transformer

FT37-43 10 TURNS.PNG

LTSPICE Simulation

.model 2SC5551A NPN(IS=4.58f BF=150 NF=1.003 VAF=35 IKF=1.2 ISE=5f NE=1.6 BR=35 NR=1.001 VAR=20 IKR=10.98m ISC=255.9f NC=1.5 RB=1.5 IRB=300.0m RBM=300m RE=280m RC=1.25 XTB=0 EG=1.11 XTI=3 CJE=2.36p VJE=199.0m MJE=73.20m TF=30.50p XTF=13.45m VTF=280.0m ITF=25.80m PTF=25.7 CJC=3.08p VJC=520.0m MJC=380.8m .15m TR=1.38n FC=1.51m )

  • Without transformer

K&P LTSPICE RF AMP.PNG

  • With transformer

K&P LTSPICE RF AMP TRANSFORMER.PNG

PCB

Rfamppcb1.4.png

Miniboard3.png

Build Instructions

  1. Align the SMD 2SC5551A RF Transistor onto Q1 pad in the center of the PCB. Using a temperature controlled solder pencil, solder without overheating.
  2. Align the four 100n SMD capacitors on the PCB and solder.
  3. Install resistors R1, R2, R3 and R4 on the PCB and solder.
  4. Install Toroids Transformer T1, Twist the Red & Green wires together to about 4 twists per inch. Wind 10 turns of the twisted wires onto the toroid. The magnet wire is heat stripable; trim each wire end to 3/4 inches. Prepare the toroid wires for soldering.
  5. Magnet Wire Soldering Details Here: One of each colored wires connects under the toroid and one of each colored wires connects on the outside of the toroid. One color wire should connect to J3/C4 and the other color connects to Q1. You should also have 2 different color wires connecting under the toroid via a PCB trace.
  6. R5,6,7 (not included) are used to attenuate the rf output. Place a jumper wire across R6.
  7. Connect the RF Amplifier via J1(input), J2(output) and J3(power).

NanoVNA Measurements

  • NanoVNA
    • Sweep settings, Attenuator in port CH1 (s21) in dB: 30.0
  • Built two, identical results

At 1, 9 and 30 MHz

K&P LTSPICE RF AMP NanoVNA 1MHz-30MHz at3Points.PNG

S21 Gain

K&P LTSPICE RF AMP NanoVNA 1MHz-30MHz S21-Gain.PNG

SWR

  • Very good match

K&P LTSPICE RF AMP NanoVNA 1MHz-30MHz SWR.PNG

1-100 MHz Sweep

  • 20 dB gain at 80 MHz

K&P RF AMP NanoVNA 1MHz-100MHz at3Points.PNG

K&P RF AMP NanoVNA 1MHz-100MHz S21-Gain.PNG

References

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