Difference between revisions of "Kits and Parts Mixers"
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== Bridged Tee Diplexer == | == Bridged Tee Diplexer == | ||
Revision as of 17:31, 5 November 2021
Contents
Kits and Parts Mixers - Features in Common
- Available as Diode Ring Mixer or ADE-1 || ADE-6 Double Balanced Diode Ring Mixer kits from Kits and Parts
- LO, IF, RF Ports are all 50Ω
- +7dBm Local Oscillator injection level
- As measured into 50Ω load
- Mixers are not linear and loads should not be measured at the mixer
- As measured into 50Ω load
- ~5dB RF > IF conversion loss in HF region
- IF Port
- Full Diplexer at the IF Port
- Low Pass Filter can be populated if used as Product Detector / Balanced Modulator
- Board has pads (1206 SMT or 1/8W resistor pads) for optional Attenuators on RF & LO Ports
- 3 pin, 0.1" pads at board edges allow SMA edge connectors to be used
- Mounting holes in all 4 corners
Kits and Parts ADE-1 Mixer
- Kits and Parts Mixer
- Mini-Circuits ADE-1+ Double Balanced Diode Mixer with built in 50Ω transformers
- Not necessary to build and tune diplexer first if using NanoVNA and/or tinySA
- Only 1 cap adjust
- Inductors can also be spread/compressed if needed
- Available from Kits and Parts as bare PCB or kit of parts
- Bare board - $5
- Kit - $14
- Good deal since the mixer itself is $6
ADE-1 Schematic
Performance
Port VWSR
- Measured VSWR of 2.23 at 9 MHz with NanoVNA matches spec nicely
ADE-1 Measurements
NanoVNA Measurements
- 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 Measurements
LO to IF port isolation
- Driven by VFO-001 3.3V squarewave output
- Signal level about 0.5 dBm
- CLK0 = 9 MHz into LO port
- Monitor IF output from mixer on tinySA
- Output through 20 dB attenuator (tinySA set to -20dB gain)
Mixer Operation
- Mixer is driven by VFO-001 3.3V squarewave outputs
- Signal output levels about 0.5 dBm
- CLK0 = RF @7 MHz VFO-001 output with 30 dB attenuator
- CLK1 = LO @16 MHz no attenuator
- Monitor IF output from mixer on tinySA
- IF out to tinySA with 20 dB attenuator (tinySA set to -20dB gain)
- Same but 9 MHz picked out
- Approx. 8 dB insertion loss
- Look at 7 MHz RF freq on IF output
- Look at 16 MHz LO freq on IF output
Kits and Parts Diode Mixer
- Double Balanced Diode Ring Mixer Kit
- Not necessary to build and tune diplexer first is using a NanoVNA or tinySA to adjust
- Available from Kits and Parts as bare PCB or kit of parts
- Bare board - $5
- Kit - $12
Diode Mixer Card Schematic
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
Toroid Winding Direction
- Toroids needs to be wound to match the pad locations/offsets on the PCB
Adjust IF Diplexer C1 (ADE-1)
- Drive RF port from NanoVNA
- Nominal 0 dBm drive level
- IF port is output
- Listen on IF port on NanoVNA
- No drive on LO
- 9 MHz is IF design frequency
- Nano VNA set to scan from 1 Mhz to 30 MHz
- Shows peak expected signal around 9 MHz
- Scan from 8 to 10 MHz
- Adjust C1 to peak near 9 MHz
- Eliminate double peaks
ADE-1 Mixer as Product Detector
- RF is 9 MHz from IF stage
- LO is 9 MHz BFO from VFO-003
- Minor adjustments to get to side of the base band offset
- IF output is audio
- Mixer goes down to DC
- IF needs Audio Filter
- IF port wants to see 50 Ohm termination across output
- 0.33 uF cap/50 ohms terminates higher frequencies at 50 ohms
- 1.5 mH inductor in series as filter on audio output
- LTSpice Simulation
- Circuit Mods
- IF section
Videos
