Difference between pages "VFO-001" and "Kits and Parts Mixers"
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| − | + | == Kits and Parts Mixers Features in Common == | |
| − | + | * All Ports are 50Ω | |
| + | * +7dBm Local Oscillator Injection Design | ||
| + | * Full Diplexer at the IF Port | ||
| + | * Optional Attenuators for RF & LO Ports | ||
| + | * Available as bare PCB or kit of parts | ||
| − | + | === My Typical Applications === | |
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| − | + | * 7 MHz RF, 40 M band | |
| + | * 16 MHz LO | ||
| + | ** Si5351A square wave drive, 50 Ohm source impedance, 1.65V peak | ||
| + | * 9 MHz IF feeds Crystal Filter | ||
| + | ** SSB or CW [[Crystal Filter Design|Crystal Filter Design]] | ||
| + | *** [[Crystal Filter Design#SSB 4 Crystal Filter on Kits and Parts Board|SSB4 Crystal filter]] | ||
| + | *** [[Crystal_Filter_Design#CW 5 Crystal Filter on Kits and Parts Board|CW5 Crystal Filter]] | ||
| − | + | == Kits and Parts ADE-1 Mixer == | |
| − | * | + | * [https://kitsandparts.com/ADE.php Kits and Parts Mixer] |
| − | * | + | * Build and tune diplexer first |
| − | + | [[file:ADE-1.SCH.png]] | |
| − | + | [[file:ADE-1.PCB.png]] | |
| − | + | ==== Toroid Winding Direction ==== | |
| − | + | * Toroids needs to be wound to match the pad locations/offsets on the PCB | |
| − | + | [[file:toroid-cw.jpg]] | |
| − | + | === ADE-1 Schematic === | |
| − | + | [[file:ADE-1_Schematic.PNG]] | |
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| − | + | === Performance === | |
| − | + | [[file:Chart_dBm-to-Volts.PNG]] | |
| − | [[ | + | [[file:ADE-1_Performance.PNG]] |
| − | + | [[file:ADE-1_ElectricalSpecs.PNG]] | |
| − | + | === Port VWSR === | |
| − | + | * Measured VSWR of 2.23 at 9 MHz with NanoVNA matches spec nicely | |
| − | + | [[file:ADE-1_LO_VSWR.PNG]] | |
| − | + | [[file:ADE-1_IF_VSWR.PNG]] | |
| − | + | [[file:ADE-1_RF_VSWR.PNG]] | |
| − | + | === ADE-1 Measurements === | |
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| − | === | + | ==== NanoVNA ==== |
| − | * | + | * No RF in |
| − | * | + | * LO driven by NanoVNA Tx |
| − | * | + | ** About -10dBm output |
| − | + | * IF output to NanoVNA Rx | |
| + | * IF at 9 MHz | ||
| + | ** VSWR: 2.233 | ||
| + | ** S21 Gain: -67 dB | ||
| − | + | [[file:ADE-1.NanoVNA_LO-to-IF.png]] | |
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| − | + | * NanoVNA | |
| + | * No LO in | ||
| + | * RF driven by NanoVNA Tx | ||
| + | * IF output to NanoVNA Rx | ||
| + | * IF at 9 MHz | ||
| + | ** VSWR: 2.216 | ||
| + | ** S21 Gain: -42 dB | ||
| − | + | [[file:ADE-1.NanoVNA_RF-to-IF.png]] | |
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| − | + | * Scanning from 1 to 100 MHz | |
| − | + | [[file:ADE-1.NanoVNA_RF-to-IF_1-100MHz.png]] | |
| − | + | ==== tinySA ==== | |
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| − | [[ | + | * Driven by [[VFO-001]] |
| + | * Signal level about 1 dBm | ||
| + | * Insert signal into LO port | ||
| + | * Monitor IF output | ||
| + | * Output through 20 dB attenuator (tinySA set to -20dB gain) | ||
| − | + | [[file:ADE-1.tinySA_RF-to-IF_9Mhz-center.png]] | |
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| − | + | == Bridged Tee Diplexer == | |
| − | == | + | 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 | ||
| + | * FT37-67, 20T-12" = 8 uH | ||
| + | * T37-17, 13T-10" = 250 nH | ||
| + | * 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] | ||
| + | * [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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| + | === Adjust Diplexer C1 (ADE-1) === | ||
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| + | * Drive RF port from NanoVNA | ||
| + | * Listen on IF port of NanoVNA | ||
| + | * No drive on LO | ||
| + | * 9 MHz is IF design frequency | ||
| + | * Nano VNA set to scan from 1 Mhz to 30 MHz | ||
| + | ** Shows peak at 9 MHz | ||
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| + | [[file:ADE-1.NanoVNA_RF-to-IF.png]] | ||
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| + | * Scan from 8 to 10 MHz | ||
| + | * Adjust C1 to peak near 9 MHz | ||
| + | ** Eliminate double peaks | ||
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| + | [[file:ADE-1.NanoVNA_RF-to-IF_8-10MHz.png]] | ||
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| + | == Kits and Parts Diode Mixer == | ||
| − | + | * [https://kitsandparts.com/DBDM.php Double Balanced Diode Ring Mixer Kit] | |
| + | * Build and tune diplexer first | ||
| − | + | [[file:DBDM.SCH.png]] | |
| − | + | [[file:DBDM.PCB.png]] | |
| − | + | == Videos == | |
| − | <video type="youtube"> | + | <video type="youtube">GvadQpkZ8l0</video> |
| − | + | <video type="youtube">Mm7WfVzr1ao</video> | |
Revision as of 13:26, 1 October 2021
Contents
Kits and Parts Mixers Features in Common
- All Ports are 50Ω
- +7dBm Local Oscillator Injection Design
- Full Diplexer at the IF Port
- Optional Attenuators for RF & LO Ports
- Available as bare PCB or kit of parts
My Typical Applications
- 7 MHz RF, 40 M band
- 16 MHz LO
- Si5351A square wave drive, 50 Ohm source impedance, 1.65V peak
- 9 MHz IF feeds Crystal Filter
Kits and Parts ADE-1 Mixer
- Kits and Parts Mixer
- Build and tune diplexer first
Toroid Winding Direction
- Toroids needs to be wound to match the pad locations/offsets on the PCB
ADE-1 Schematic
Performance
Port VWSR
- Measured VSWR of 2.23 at 9 MHz with NanoVNA matches spec nicely
ADE-1 Measurements
NanoVNA
- No RF in
- LO driven by NanoVNA Tx
- About -10dBm output
- IF output to NanoVNA Rx
- IF at 9 MHz
- VSWR: 2.233
- S21 Gain: -67 dB
- NanoVNA
- No LO in
- RF driven by NanoVNA Tx
- IF output to NanoVNA Rx
- IF at 9 MHz
- VSWR: 2.216
- S21 Gain: -42 dB
- Scanning from 1 to 100 MHz
tinySA
- Driven by VFO-001
- Signal level about 1 dBm
- Insert signal into LO port
- Monitor IF output
- Output through 20 dB attenuator (tinySA set to -20dB gain)
Bridged Tee Diplexer
Diplexor is a bandpass/band-stop filter popularized by 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.
LTSpice simulation
- 9 MHz
- FT37-67, 20T-12" = 8 uH
- T37-17, 13T-10" = 250 nH
- C2 adjusts peak from left to right
Adjust Diplexer C1 (ADE-1)
- Drive RF port from NanoVNA
- Listen on IF port of NanoVNA
- No drive on LO
- 9 MHz is IF design frequency
- Nano VNA set to scan from 1 Mhz to 30 MHz
- Shows peak at 9 MHz
- Scan from 8 to 10 MHz
- Adjust C1 to peak near 9 MHz
- Eliminate double peaks
Kits and Parts Diode Mixer
- Double Balanced Diode Ring Mixer Kit
- Build and tune diplexer first
Videos
