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− | == Kits and Parts Mixers Features in Common ==
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− | * All Ports are 50Ω
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− | * +7dBm Local Oscillator Injection Design
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− | * Full Diplexer at the IF Port
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− | * Optional Attenuators for RF & LO Ports
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− | * Available as bare PCB or kit of parts
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− | === My Typical Applications ===
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− | * 7 MHz RF, 40 M band
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− | * 16 MHz LO
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− | ** Si5351A square wave drive, 50 Ohm source impedance, 1.65V peak
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− | * 9 MHz IF feeds Crystal Filter
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− | ** SSB or CW [[Crystal Filter Design|Crystal Filter Design]]
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− | *** [[Crystal Filter Design#SSB 4 Crystal Filter on Kits and Parts Board|SSB4 Crystal filter]]
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− | *** [[Crystal_Filter_Design#CW 5 Crystal Filter on Kits and Parts Board|CW5 Crystal Filter]]
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− | == Kits and Parts ADE-1 Mixer ==
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− | * [https://kitsandparts.com/ADE.php Kits and Parts Mixer]
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− | * Build and tune diplexer first
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− | [[file:ADE-1.SCH.png]]
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− | [[file:ADE-1.PCB.png]]
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− | ==== Toroid Winding Direction ====
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− | * Toroids needs to be wound to match the pad locations/offsets on the PCB
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− | [[file:toroid-cw.jpg]]
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− | === ADE-1 Schematic ===
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− | [[file:ADE-1_Schematic.PNG]]
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− | === Performance ===
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− | [[file:Chart_dBm-to-Volts.PNG]]
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− | [[file:ADE-1_Performance.PNG]]
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− | [[file:ADE-1_ElectricalSpecs.PNG]]
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− | === Port VWSR ===
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− | * Measured VSWR of 2.23 at 9 MHz with NanoVNA matches spec nicely
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− | [[file:ADE-1_LO_VSWR.PNG]]
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− | [[file:ADE-1_IF_VSWR.PNG]]
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− | [[file:ADE-1_RF_VSWR.PNG]]
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− | == Kits and Parts Diode Mixer ==
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− | * [https://kitsandparts.com/DBDM.php Double Balanced Diode Ring Mixer Kit]
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− | * Build and tune diplexer first
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− | [[file:DBDM.SCH.png]]
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− | [[file:DBDM.PCB.png]]
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− | == Bridged Tee Diplexer ==
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− | Diplexor is a bandpass/band-stop filter popularized by [https://www.youtube.com/watch?v=iVUv8C-8g-Y Joe Reisert W1JR] that is used after a double Balanced Mixer to provide a 50 ohm termination to all frequencies at the mixer's IF port, and to the following amplifier stage. Maintaining a consistent load at the mixer avoids overload and Inter-Modulation Distortion (IMD) effects that these mixers are prone to when not properly terminated.
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− | === LTSpice simulation ===
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− | * 9 MHz
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− | * FT37-67, 20T-12" = 8 uH
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− | * T37-17, 13T-10" = 250 nH
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− | * C2 adjusts peak from left to right
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− | [[FILE:DIPLEXER_SPICE_SIM.PNG]]
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− | * [https://www.changpuak.ch/electronics/calc_16a.php Diplexer Calculator (Bridged Tee) Diplexer Calculator]
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− | * [https://www.qsl.net/g3oou/mixerterminations.html Mixer Diplexer description]
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− | [[file:Diplexer.PNG]]
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− | [[file:Diplexer_pass.PNG]]
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− | <video type="youtube">zOk_0IiIgZY</video>
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− | == Measurements ==
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− | * NanoVNA
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− | * No RF in
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− | * LO driven by NanoVNA Tx
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− | * IF output to NanoVNA Rx
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− | * IF at 9 MHz
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− | ** VSWR: 2.233
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− | ** S21 Gain: -67 dB
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− | [[file:ADE-1.NanoVNA_LO-to-IF.png]]
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− | * NanoVNA
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− | * No LO in
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− | * RF driven by NanoVNA Tx
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− | * IF output to NanoVNA Rx
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− | * IF at 9 MHz
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− | ** VSWR: 2.216
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− | ** S21 Gain: -42 dB
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− | [[file:ADE-1.NanoVNA_RF-to-IF.png]]
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− | == Videos ==
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− | <video type="youtube">GvadQpkZ8l0</video>
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− | <video type="youtube">Mm7WfVzr1ao</video>
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