IT CAN ACHIEVE AN OUTSTANDING IIP3(input IP3) around  +40dBm  to  + 42dBm equal to an OIP3 (output) of +35 to +37 dBm with  5dB of insertion loss in the HF range and IF at 9MHz (for input signals  level range up to +5dBm).  Isolation between ports is good and OL power required is around  0 dBm and +5dBm much less than for passive high level diode mixers. DO NOT LEAVE Floating the LO input when powering ON the
board. With AC SOIC IC logic Total Power Supply Current, with LO generator connected with signal at 0 dBm, is around 22 mA at 5,000 Volt.

A Doubly Balanced "H-mode" Mixer for HF  " 
By Sergio Cartoceti, IK4AUY

my article  is  in July/August 2004 QEX (ARRL ) Magazine, pages 23 - 32
reproductions only with permission: copyright ARRL, QEX July/August 2004, all rights reserved).
This material originally appeared  in QEX:Forum for Communications Experimenters


: Down load here my article pdf file (for personal use only)


My QEX Article click here

(Adobe® Acrobat® Reader is required to open the above PDF file. You can download the Acrobat® Reader for free from the Adobe® Web site).

  Premises                                        See QEX
  Schematic                                       See QEX
  PCB Templates                             click here
  Binoculars details                          See QEX
  Performances                                 See QEX
  On QEX letters                              click here
  CDG2000 Mixer - links              click here
  OUR CDG2000 200W TRX      click here


I have also  tested a smaller pcb 51 mm X 36 mm  (unpublished for lack of space in the magazine):  
 a)  h-mode HF mixer all smd (the best in balance, it is always bilateral for both RX-TX), for LO NOT divided.

We have also tested:
b)  h-mode HF mixer with a divide by 2 squarer with noise blanker input pulse gate (so a mixer that can be activated as a noise blanker gate in one board)     

c)  sample and hold PRODUCT DETECTOR with a complete audio chain  plus our audio final around TDA2003 IC
d) a board with LSB-USB-CW BFO oscillators for 9 MHz used in our evaluating RX tests

Best 73 de Sergio, IK4AUY
                 Romano, I4FAF 

My 2004 QEX  article is also available inside ARRL Periodicals CD-ROM 2004

More remarks
about “A Doubly Balanced “H-mode” Mixer for HF “ article:

About other frequency ranges: in spite i intended to  use this RF Mixer with 9 Mhz IF and  an RF input from 1.8 to 30 Mhz this mixer works  upto more than 100 MHz with 43 type binocular baluns specified, but not tested it for IP3 or ports attenuation balance in that range, and insertion loss could be around 6 or 7 dB instead of around 5 dB (still comparable to a passive mixer). Use AC faster logic 74AC86 (NOT 74HC86 maximum usable up to 50 Mhz).  

Murata datasheet for LCL (5 Volt power supply filter which was not specified in component list but not critical)  EMI FILTER Suppression, 3 terminal, could be a MURATA DSS series straight type with built in ferrite beads with 10.000 pF  100 V  (suffix ending with 103) (or better a  22.000 pF   16V, suffix ending with 223)


Last update: Jan 16, 2014.