Difference between pages "Kits and Parts Lowpass Filter" and "File:OctopusTester.PNG"

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== Kits and Parts Universal Filter Board ==
 
  
* [https://kitsandparts.com/lpf.1.5.php 7-pole Universal Low Pass Filter for HF] - Kits and Parts webpage
 
** $4 PCB
 
** Handles toroid inductor sizes up to T80
 
*** 125W power
 
** 0.2" lead spacing for caps
 
** (4) 4-40 mounting holes
 
 
=== CWAZ filter ===
 
 
* [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN]
 
** Much better performance than standard 3C/3L filter at 2nd harmonic
 
** Only needs one additional capacitor across center inductor
 
** Other L/C values are a bit different to compensate
 
 
=== Other References and Topologies ===
 
 
* [https://kitsandparts.com/PCBs/LPF/filter0.pdf Introduction to LPFs by Paul Hardin, NA5N]
 
* [https://kitsandparts.com/PCBs/LPF/filter2.pdf 7 Element Chebyshev standard value capacitor LPFs]
 
* [https://rf-tools.com/lc-filter/ LC Filter Design Tool]
 
* [https://www.66pacific.com/calculators/toroid-coil-winding-calculator.aspx Toroid Coil Winding Calculator]
 
 
=== K&P Schematic ===
 
 
[[file:LPF.1.5.sch.png]]
 
 
=== K&P PCB ===
 
 
[[file:LPF.1.5.pcb.png]]
 
 
== CWAZ 40M, 7 MHz Filter ==
 
 
* Based on [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] - Built this one
 
 
=== SPICE Simulation ===
 
 
* [https://github.com/land-boards/lb-boards/tree/master/HamRadio/BUTTER07/DOCS/Spice_Sims GitHub repo]
 
* -6 dB at 7 MHz
 
* -68 dB at 1st harmonic (14 MHz)
 
* -75 dB at 2nd harmonic (21 MHz)
 
 
[[file:CWAZ_LowPass7MHz_SPICE.png]]
 
 
[[file:CWAZ_LowPass_Values.PNG]]
 
 
=== T37-2 Inductors ===
 
 
* [http://toroids.info/T37-2.php T37-2 Toroid Specs and turns calculator]
 
 
==== 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
 
 
[[file:LowPass7MHz_NanoVNA.png]]
 
 
== Rebuild - Higher Power ==
 
 
* T80-2 Inductors
 
** Larger gauge wire
 
** Integer turns values
 
** [http://toroids.info/T80-2.php T80-2 Toroid Specs and turns calculator]
 
 
[[file:Toroid_1.24uH_15T.PNG]]
 
 
[[file:Toroid_1.41uH_16T.PNG]]
 
 
=== Simulation ===
 
 
[[file: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
 
 
[[file:CWAZ_7MHZ_NANOVNA_125W_PLOTS.PNG]]
 
 
[[file:CWAZ_7MHZ_NANOVNA_125W_DATA.PNG]]
 
 
== CWAZ - 20M, 14MHz LP Filter ==
 
 
* SPICE Simulation
 
 
[[file:CWAZ-20M-SPICE.PNG]]
 
 
* Toroid T80-2
 
 
[[file:ind-680nH.PNG]]
 
 
[[file:ind-608nH.PNG]]
 
 
* T80-2 has Optimum Resonant Circuit Range for highest Q and lowest core loss
 
** 250 KHz - 10 MHz
 
* T80-6 has better characteristics
 
** Optimum Resonant Circuit Range for highest Q and lowest core loss
 
** 3 MHz - 40 MHz
 
* Don't have any T80-6 but I do have T37-6
 
 
[[file:T37-6_Ind-608nH.PNG]]
 
 
[[file:T37-6_Ind-680nH.PNG]]
 
 
=== NanoVNA caps ===
 
 
[[file:CWAZ-20M-NanoVNA-data.PNG]]
 
 
[[file:CWAZ-20M-NanoVNA-plot.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: [https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/CDV16FF101JO3F?qs=tNDx7qEChkcFgJ1eZKwb4g%3D%3D CDV16FF101JO3F], $1.40 (per, qty 10)
 
*** 100pF, Ceramic cap, P/N: CC45SL3AD101JYNNA, $0.14 (per, qty 10)
 
** 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?
 
*** SL caps are single layer
 
 
{| class="wikitable"
 
! 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
 
|-
 
|}
 

Latest revision as of 11:30, 4 September 2021