Difference between pages "Kits and Parts Mixers" and "File:ADE-1.NanoVNA RF-to-IF 1-100MHz.png"

From Land Boards Wiki
(Difference between pages)
Jump to navigation Jump to search
 
 
Line 1: Line 1:
== 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
 
** 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]]
 
 
=== 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]]
 
 
== 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]]
 
 
== 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.
 
 
=== LTSpice simulation ===
 
 
* 9 MHz
 
* FT37-67, 20T-12" = 8 uH
 
* T37-17, 13T-10" = 250 nH
 
* C2 adjusts peak from left to right
 
 
[[FILE:DIPLEXER_SPICE_SIM.PNG]]
 
 
* [https://www.changpuak.ch/electronics/calc_16a.php Diplexer Calculator (Bridged Tee) Diplexer Calculator]
 
* [https://www.qsl.net/g3oou/mixerterminations.html Mixer Diplexer description]
 
 
[[file:Diplexer.PNG]]
 
 
[[file:Diplexer_pass.PNG]]
 
 
<video type="youtube">zOk_0IiIgZY</video>
 
 
=== Adjust Diplexer C1 ===
 
 
* 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
 
 
[[file:ADE-1.NanoVNA_RF-to-IF.png]]
 
 
* Scan from 8 to 10 MHz
 
* Adjust C1 to peak near 9 MHz
 
** Eliminate double peaks
 
 
[[file:ADE-1.NanoVNA_RF-to-IF_8-10MHz.png]]
 
 
* Scanning from 1 to 100 MHz
 
 
[[file:ADE-1.NanoVNA_RF-to-IF_1-100MHz.png]]
 
 
== Measurements ==
 
 
* NanoVNA
 
* No RF in
 
* LO driven by NanoVNA Tx
 
* IF output to NanoVNA Rx
 
* IF at 9 MHz
 
** VSWR: 2.233
 
** S21 Gain: -67 dB
 
 
[[file:ADE-1.NanoVNA_LO-to-IF.png]]
 
 
* 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]]
 
 
== Videos ==
 
 
<video type="youtube">GvadQpkZ8l0</video>
 
 
<video type="youtube">Mm7WfVzr1ao</video>
 

Latest revision as of 10:01, 1 October 2021