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-- The Montreal Doppler 3V2 --

Last update, March 23, 06

           Front panel                  Doppler inside

                                FRONT PANEL                                                                       INSIDE VIEW

    inside open                           board

            2 BOARDS ARE BACK TO BACK                                                                MAIN BOARD

Connectors

                     CONNECTORS

MORE PHOTOS FROM BUILDERS...

Lots more pictures on the web page of the AMATEUR RADIO CLUB VE2UMS:

http://www.ve2ums.ca/chasse/Serge/Transmitter%20Hunting/Doppler/doppler_links.htm

Please contact me for more info.

FEATURES

-   36 LEDs display; center LED when green = good signal, when red = no signal ,  the direction is frozen to the last good signal.
-   Uses 3 PICs; a PIC16F628A for the display, a PIC18F4520 as the main processor and a PIC12F675 as a frequency divider.
-   Filters; a Max 267, the best bandpass filter that I have ever seen, followed by the Roanoke switch cap filter for very narrow band width (+/- 0.5Hz).
-   My DopplerII integrating and phase detection software in the main PIC.
-   LM386 for monitoring the audio independently from the doppler.
-   Simpler menu selection, turning a selection pot and a pushing a DO switch.
-   It will switch 4 antennas with a + or - going signal, 4 antennas differential, 8 antennas with a + or - going signal.
-   Pushing the DO PB sends the direction to APRS.  The protocol is:  <cr><lf>%359/Q<cr><lf>. The Q (0<8) is the quality of the signal just before the
     extraction of the phase information.
-   GPS information goes through the doppler, it will be instantly interrupted when the doppler sends a DF to APRS on a PC.
-   Faster main processor, PIC18F4520.    **** NEW ****  June 06

THE MENUS:

 0 - Main operating position ;
       First line shows: Quality Factor(signal out of the last soft filter in the PIC), direction in deg., # of returns being integrated.
       Second line shows: A bargraph of the signal level out of the MAX267 input filter or a S-Meter DC signal from your radio if needed.
       The DO Push Button alternate between no signal processing and selected integration.
       This menu can be removed by removing a jumper (H1) if only APRS is in use.

 1 - Also a main operating position;
       First line shows: Quality Factor(signal out of the last soft filter in the PIC), direction in deg., # of returns being integrated.
       Second line shows: A bargraph of the signal level out of the MAX267 input filter or a S-Meter DC signal from your radio if needed.
       The DO PushButton sends a DF to a PC. (via RS232)

 2 - Reduce the quantity of integration by pushing the DO PB.
 3 - Increase the quantity of integration by pushing the DO PB.
 4 - Auto calibration to foward by pushing the DO PB.
 5 - Reduce the calibration position manually by pushing the DO PB.
 6 - Increase the calibration position manually by pushing the DO PB.
 7 - Selection of the minimum Quality Factor (1<8) for displaying a good return. Less then the selected number, freeze the display to the last good return.
 8 - LCD display, BRIGHT / DIM control.  **** NEW ****  June 06
 9 - Future menu
10- Selection of the DF to PC baud rate, 2400, 4800, 9600, 19200.
11- Bargraph selection of the S-Meter from a radio or the level out of first MAX 267 filter.
12- Selection of 3 complete setup for different radios or cars. **** NEW ****  June 06
13- Selection of antenna rotation CW or CCW.
14- Selection of antenna switching,  4 +/- and 4 differential or 8 +/-.
15- Selection of antenna under test. (individual activation of each antenna)

Construction and setup text 

Block diagram

Main board schematic

Main board schematic with scope waveforms for trouble shooting

Display shematic

Parts list Doppler3V2.

Parts list Doppler3.

   display pcb       main pcb
                                         Display board                                                                                      Main board

May I suggest the use of Joe Moell K0OV's wide band antenna system for this doppler. It is on the Homing In web site.

   Here is the viewer/printer software for the schematic, and the complete schematics for the doppler3V2, includes the switcher.
   Here is the viewer/printer software for the PCBs, and the complete PCBs files for the doppler3V2, includes the switcher.
    The above viewers are self contained software and do not leave traces in your PC.

    Buy the PCBs and PICs from Fred KF9GX at Far Circuits.
    I can program your PICs, the source program and the object code is also availlable for Amateur Radio use only by writing to VE2EMM.

SUGGESTIONS
    Please send your suggestions and requests, they will be appreciated.
    Thanks & 73, Jacques VE2EMM

My new untested switcher, a variant of Joe Moell wideband switcher. One more untested antenna switcher prototype.
Switcher center, switcher antenna ends


Fine print:
All material on this page is distributed on a WYSIWYG basis and as such I can't take any responsibility for the use of this design and its results. However in saying this it must also be mentioned that every effort  has been taken to ensure that it as error free as possible.

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Many thanks to Al Waller K3TKJ for graciously hosting my web pages on QSL.NET.