Difference between pages "File:CWAZ 7MHZ NANOVNA 125W PLOTS.PNG" and "Kits and Parts Lowpass Filter"

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== Kits and Parts Universal Filter Board ==
  
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* [https://kitsandparts.com/lpf.1.5.php 7-pole Universal Low Pass Filter for HF] - Kits and Parts webpage
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** $4 PCB
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** Handles toroid inductor sizes up to T80
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*** 125W power
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** 0.2" lead spacing for caps
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** (4) 4-40 mounting holes
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=== CWAZ filter ===
 +
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* [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN]
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** Much better performance than standard 3C/3L filter at 2nd harmonic
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** Only needs one additional capacitor across center inductor
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** Other L/C values are a bit different to compensate
 +
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=== Other References and Topologies ===
 +
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* [https://kitsandparts.com/PCBs/LPF/filter0.pdf Introduction to LPFs by Paul Hardin, NA5N]
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* [https://kitsandparts.com/PCBs/LPF/filter2.pdf 7 Element Chebyshev standard value capacitor LPFs]
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* [https://rf-tools.com/lc-filter/ LC Filter Design Tool]
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* [https://www.66pacific.com/calculators/toroid-coil-winding-calculator.aspx Toroid Coil Winding Calculator]
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=== K&P Schematic ===
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[[file:LPF.1.5.sch.png]]
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=== K&P PCB ===
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[[file:LPF.1.5.pcb.png]]
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== CWAZ 40M, 7 MHz Filter ==
 +
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* Based on [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] - Built this one
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=== SPICE Simulation ===
 +
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* [https://github.com/land-boards/lb-boards/tree/master/HamRadio/BUTTER07/DOCS/Spice_Sims GitHub repo]
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* -6 dB at 7 MHz
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* -68 dB at 1st harmonic (14 MHz)
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* -75 dB at 2nd harmonic (21 MHz)
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[[file:CWAZ_LowPass7MHz_SPICE.png]]
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[[file:CWAZ_LowPass_Values.PNG]]
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=== T37-2 Inductors ===
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* [http://toroids.info/T37-2.php T37-2 Toroid Specs and turns calculator]
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==== INDUCTANCE - L1, L3 ====
 +
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* Desired:  1.34 uH
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* Calculated: 1.3 uH (97% of desired) Turns required: 18
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* CORE
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* Part number: T-37-2 (Red)
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* Frequency Range: 1 to 30 MHz
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* u: 10
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* AL: 40 uH/100 turns
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==== INDUCTANCE - L2 ====
 +
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* Desired:  1.22 uH
 +
* Calculated: 1.2 uH (95% of desired) Turns required: 17
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* CORE
 +
* Part number: T-37-2 (Red)
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* Frequency Range: 1 to 30 MHz
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* u: 10
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* AL: 40 uH/100 turns
 +
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=== Measured on NanoVNA ===
 +
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* 7 MHz LP filter
 +
* Built with junk box low voltage ceramic disc caps
 +
 +
[[file:LowPass7MHz_NanoVNA.png]]
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== Rebuild - Higher Power ==
 +
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* T80-2 Inductors
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** Larger gauge wire
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** Integer turns values
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** [http://toroids.info/T80-2.php T80-2 Toroid Specs and turns calculator]
 +
 +
[[file:Toroid_1.24uH_15T.PNG]]
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[[file:Toroid_1.41uH_16T.PNG]]
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=== Simulation ===
 +
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[[file:CWAZ_LowPass7MHz_SPICE_IntegerTurnsInd.png]]
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=== Measured with NanoVNA ===
 +
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* Excellent performance!!!
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* 7 MHz
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** S21 = -1.55 dB
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** VSWR = 1.008
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* 14 MHz - 1st harmonic
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** S21 = -55.8 dB
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** VSWR = 5.181
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* 21 MHz - 2nd harmonic
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** S21 = -69 dB
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** VSWR = 15.225
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[[file:CWAZ_7MHZ_NANOVNA_125W_PLOTS.PNG]]
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[[file:CWAZ_7MHZ_NANOVNA_125W_DATA.PNG]]
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== CWAZ - 20M, 14MHz LP Filter ==
 +
 +
[[file:CWAZ-20M-SPICE.PNG]]
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== Ceramic Disc Caps ==
 +
 +
* High voltage quality caps
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** Ceramic - should these be silver mica caps?
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** Ceramic caps are 10x cheaper than silver mica caps
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*** 100pF, Silver Mica cap, P/N: [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/CDV16FF101JO3F?qs=tNDx7qEChkcFgJ1eZKwb4g%3D%3D CDV16FF101JO3F], $1.40 (per, qty 10)
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*** 100pF, Ceramic cap, P/N: CC45SL3AD101JYNNA, $0.14 (per, qty 10)
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** Will the ceramic caps cause [https://e2e.ti.com/blogs_/archives/b/precisionhub/posts/stress-induced-outbursts-microphonics-in-ceramic-capacitors-part-1 Microphonics] or is that only an issue in gain stages?
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*** SL caps are single layer
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{| class="wikitable"
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! Capacitance (pF)
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! Mfr. #
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! Manufacturer
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! Description
 +
|-
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| 10
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| S100K33SL0R63K7R
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| Vishay
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| Ceramic Disc Capacitors 10pF 3000V 10% SL0 7.5mm LS
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|-
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| 33
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| CC45SL3AD330JYNNA
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| TDK
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| Ceramic Disc Capacitors D: 5.5mm 1kV 33pF SL 5% LS:5mm
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|-
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| 47
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| CC45SL3AD470JYVNA
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| TDK
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| Ceramic Disc Capacitors D: 5.5mm 1kV 47pF SL 5% LS:5mm
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|-
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| 82
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| CC45SL3AD820JYNNA
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| TDK
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| Ceramic Disc Capacitors D: 6mm 1kV 82pF SL 5% LS:5mm
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|-
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| 100
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| CC45SL3AD101JYNNA
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| TDK
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| Ceramic Disc Capacitors D: 6.5mm 1kV 100pF SL 5% LS:5mm
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|-
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| 120
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| CC45SL3AD121JYNNA
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| TDK
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| Ceramic Disc Capacitors D: 7mm 1kV 120pF SL 5% LS:5mm
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|-
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| 200
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| S201K33S3NN63L6R
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| Vishay
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| Ceramic Disc Capacitors 200PF 1KV 10%
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|-
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| 270
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| CC45SL3AD271JYVNA
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| TDK
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| Ceramic Disc Capacitors D: 9mm 1kV 270pF SL 5% LS:5mm
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|-
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| 330
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| S331K33Y5PR63K7R
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| Vishay
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| Ceramic Disc Capacitors 330pF 3000V 10% Y5P 7.5mm LS
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|-
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| 390
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| CC45SL3AD391JYVNA
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| TDK
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| Ceramic Disc Capacitors D: 10.5mm 1kV 390pF SL 5% LS:5mm
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|-
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| 470
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| D471K20Y5PH6UJ5R
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| Vishay
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| Ceramic Disc Capacitors 470pF 100V 10%
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|-
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| 680
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| S681K29Y5PN63J5R
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| Vishay
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| Ceramic Disc Capacitors 680pF 1000V 10% Y5P 5.0mm LS
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|-
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|}

Revision as of 14:58, 3 September 2021

Kits and Parts Universal Filter Board

CWAZ filter

Other References and Topologies

K&P Schematic

LPF.1.5.sch.png

K&P PCB

LPF.1.5.pcb.png

CWAZ 40M, 7 MHz Filter

SPICE Simulation

  • GitHub repo
  • -6 dB at 7 MHz
  • -68 dB at 1st harmonic (14 MHz)
  • -75 dB at 2nd harmonic (21 MHz)

CWAZ LowPass7MHz SPICE.png

CWAZ LowPass Values.PNG

T37-2 Inductors

INDUCTANCE - L1, L3

  • Desired: 1.34 uH
  • Calculated: 1.3 uH (97% of desired) Turns required: 18
  • CORE
  • Part number: T-37-2 (Red)
  • Frequency Range: 1 to 30 MHz
  • u: 10
  • AL: 40 uH/100 turns

INDUCTANCE - L2

  • Desired: 1.22 uH
  • Calculated: 1.2 uH (95% of desired) Turns required: 17
  • CORE
  • Part number: T-37-2 (Red)
  • Frequency Range: 1 to 30 MHz
  • u: 10
  • AL: 40 uH/100 turns

Measured on NanoVNA

  • 7 MHz LP filter
  • Built with junk box low voltage ceramic disc caps

LowPass7MHz NanoVNA.png

Rebuild - Higher Power

Toroid 1.24uH 15T.PNG

Toroid 1.41uH 16T.PNG

Simulation

CWAZ LowPass7MHz SPICE IntegerTurnsInd.png

Measured with NanoVNA

  • Excellent performance!!!
  • 7 MHz
    • S21 = -1.55 dB
    • VSWR = 1.008
  • 14 MHz - 1st harmonic
    • S21 = -55.8 dB
    • VSWR = 5.181
  • 21 MHz - 2nd harmonic
    • S21 = -69 dB
    • VSWR = 15.225

CWAZ 7MHZ NANOVNA 125W PLOTS.PNG

CWAZ 7MHZ NANOVNA 125W DATA.PNG

CWAZ - 20M, 14MHz LP Filter

CWAZ-20M-SPICE.PNG

Ceramic Disc Caps

  • High voltage quality caps
    • Ceramic - should these be silver mica caps?
    • Ceramic caps are 10x cheaper than silver mica caps
      • 100pF, Silver Mica cap, P/N: CDV16FF101JO3F, $1.40 (per, qty 10)
      • 100pF, Ceramic cap, P/N: CC45SL3AD101JYNNA, $0.14 (per, qty 10)
    • Will the ceramic caps cause Microphonics or is that only an issue in gain stages?
      • SL caps are single layer
Capacitance (pF) Mfr. # Manufacturer Description
10 S100K33SL0R63K7R Vishay Ceramic Disc Capacitors 10pF 3000V 10% SL0 7.5mm LS
33 CC45SL3AD330JYNNA TDK Ceramic Disc Capacitors D: 5.5mm 1kV 33pF SL 5% LS:5mm
47 CC45SL3AD470JYVNA TDK Ceramic Disc Capacitors D: 5.5mm 1kV 47pF SL 5% LS:5mm
82 CC45SL3AD820JYNNA TDK Ceramic Disc Capacitors D: 6mm 1kV 82pF SL 5% LS:5mm
100 CC45SL3AD101JYNNA TDK Ceramic Disc Capacitors D: 6.5mm 1kV 100pF SL 5% LS:5mm
120 CC45SL3AD121JYNNA TDK Ceramic Disc Capacitors D: 7mm 1kV 120pF SL 5% LS:5mm
200 S201K33S3NN63L6R Vishay Ceramic Disc Capacitors 200PF 1KV 10%
270 CC45SL3AD271JYVNA TDK Ceramic Disc Capacitors D: 9mm 1kV 270pF SL 5% LS:5mm
330 S331K33Y5PR63K7R Vishay Ceramic Disc Capacitors 330pF 3000V 10% Y5P 7.5mm LS
390 CC45SL3AD391JYVNA TDK Ceramic Disc Capacitors D: 10.5mm 1kV 390pF SL 5% LS:5mm
470 D471K20Y5PH6UJ5R Vishay Ceramic Disc Capacitors 470pF 100V 10%
680 S681K29Y5PN63J5R Vishay Ceramic Disc Capacitors 680pF 1000V 10% Y5P 5.0mm LS

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