Difference between revisions of "Kits and Parts Lowpass Filter"
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− | == Parts and | + | == 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/filter0.pdf Introduction to LPFs by Paul Hardin, NA5N] | ||
* [https://kitsandparts.com/PCBs/LPF/filter2.pdf 7 Element Chebyshev standard value capacitor LPFs] | * [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] | * [https://www.66pacific.com/calculators/toroid-coil-winding-calculator.aspx Toroid Coil Winding Calculator] | ||
− | |||
− | |||
− | |||
=== K&P Schematic === | === K&P Schematic === | ||
Line 19: | Line 31: | ||
== CWAZ 40M, 7 MHz Filter == | == CWAZ 40M, 7 MHz Filter == | ||
+ | |||
+ | [[file:Small40M_P1821-720px.jpg]] | ||
* Based on [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] - Built this one | * Based on [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] - Built this one | ||
Line 32: | Line 46: | ||
[[file:CWAZ_LowPass_Values.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 ==== | ==== INDUCTANCE - L1, L3 ==== | ||
Line 60: | Line 78: | ||
[[file:LowPass7MHz_NanoVNA.png]] | [[file:LowPass7MHz_NanoVNA.png]] | ||
− | === Caps === | + | == Rebuild - Higher Power == |
+ | |||
+ | [[file:CWAZ-40M_125MHz_P1824-720px.jpg]] | ||
+ | |||
+ | * 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 == | ||
+ | |||
+ | [[file:CWAZ-20M_P1828-720px.jpg]] | ||
+ | |||
+ | * 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" | {| class="wikitable" | ||
! Capacitance (pF) | ! Capacitance (pF) |
Latest revision as of 00:22, 7 September 2021
Contents
Kits and Parts Universal Filter Board
- 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
- 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
- Introduction to LPFs by Paul Hardin, NA5N
- 7 Element Chebyshev standard value capacitor LPFs
- LC Filter Design Tool
- Toroid Coil Winding Calculator
K&P Schematic
K&P PCB
CWAZ 40M, 7 MHz Filter
- Based on 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN - Built this one
SPICE Simulation
- GitHub repo
- -6 dB at 7 MHz
- -68 dB at 1st harmonic (14 MHz)
- -75 dB at 2nd harmonic (21 MHz)
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
Rebuild - Higher Power
- T80-2 Inductors
- Larger gauge wire
- Integer turns values
- T80-2 Toroid Specs and turns calculator
Simulation
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 - 20M, 14MHz LP Filter
- SPICE Simulation
- Toroid T80-2
- 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
NanoVNA caps
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 |