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Author Topic: Ramsey DDF-1 issues  (Read 30830 times)
N8JGU
Member

Posts: 10




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« on: January 27, 2010, 12:55:13 PM »

People I am looking for someone who has a PDF or Photo Copy of the DDF-1 board before assembly.  I have exhusted all testing to find the problem.  I must have a soilder bridge that I cant see unless I have a view of the board.  Is anyone interested in helping a fellow Ham get his DDF-1 working?  I need a stare and compare moment.  Thank You
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KF6QEX
Member

Posts: 590




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« Reply #1 on: January 30, 2010, 12:05:23 AM »

There is a parts placement picture of the board in page 17 of the pdf on the Ramsey site
http://www.ramseyelectronics.com/downloads/manuals/DDF1.pdf
Print it on transparency paper flip it over and your'll have a picture of the copper side of the board with the parts on the other side.

As far as close inspection goes, I like to use a 10X loupe. It's like looking at another world Smiley

You could also take a picture of the solder side with a digital camera at the highest resolution setting and then you can stare at the board on your screen, one solder joint at the time ! ( You'll have to use a tripod and no flash preferably in diffused light so the board doesn't come out looking  like a stary sky.

Or if you have a good webcam , you could magnify the board "live" on your screen..So  many fun options  Smiley

Although I do know having a board that just doesn't work is no fun at all.
If you can take pictures of the solder side and post them somewhere I wouldn't mind taking a look. It will be an interesting exercise.

Dimitri

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N8JGU
Member

Posts: 10




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« Reply #2 on: February 01, 2010, 01:38:51 PM »

Thank you for your reply and tips.  I still am looking for someone who has a unbuilt kit to scan both sides of the board.
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K0OV
Member

Posts: 21




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« Reply #3 on: April 05, 2010, 10:13:46 PM »

I recently bought a Ramsey DDF kit for a special project and because of your posting I scanned both sides of the main board.  If you contact me off-forum (homingin-at-aol.com), I can send you the scans.

BTW, this board and its components are for sale, but not the antennas or antenna boards/components.  Anyone interested contact me off-forum.

Joe Moell K0OV
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PA3BNX
Member

Posts: 18




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« Reply #4 on: October 21, 2011, 11:45:04 AM »

Hallo All,

If you have build a ramsey doppler unit
you can easy adapt that to my SoundDoppler.exe
Program with just an Lowpass Af filter connected to
one of the antenne switch signals.

Then you can connect it to the line input soundcard of a PC and run my
SoundDoppler.exe program.

Then you have  averaging multipath suppressing, Plotting on
maps with Google_Earh with KML files or my Program MyMapping.exe
With UI-View32 Maps

If you only have the antennes and switcher you can of cource build my
SuperSimpleSoundDoppler for less then $20

You can even plot realtime driving from a car with a GPS connected.

Take a look at our Veron club site for free software, circuits diagrams
and photo's.


http://www.pi4wag.nl/index.php/pseudo-doppler-radio-direction-finder

I have the latest update on this site
Version SoundDoppler118d Gps111.exe and MyMapping128

Installing the software is easy

Unzip the zip file then you get 3 files
Run the setup.exe

Software doesn't write in windows registry so easy to erease.

Software is written in Visual Basic 6.0 (SoundDoppler and Gps)
and Visual Studio 2005 (MyMapping)



73's
PA3BNX
Lodewijk
Netherlands
« Last Edit: December 14, 2011, 12:42:49 PM by PA3BNX » Logged
PA3BNX
Member

Posts: 18




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« Reply #5 on: December 14, 2011, 12:23:32 PM »

Hello Every Body.

I am building an automatic HF-Peiler
Witch works with two cross loops and a sens-antenna
connected through the comport of a PC and a cat control of
a FT817 or FT840.

The PC switches from one loop to an other an and switches the
sens antenna also off and on.

I read every time the RSSI value
And store that on the PC.

It should be called a sequentieel amplitude comparison DF methode
Like Wattson Watt.

From these values I extract the direction on a Pelorus.

This work is in progress

You can follow us on

ZendAmateur.com  Under thread Computers> HF Peilen Automatisch

Sorry the langue is Dutch but you can find the intresting links there
and pictures and  the Free software Version v1.04.


http://www.zendamateur.com/viewtopic.php?f=11&t=8081&start=0


73's
PA3BNX
Lodewijk
Netherlands
« Last Edit: December 14, 2011, 12:46:04 PM by PA3BNX » Logged
PA3BNX
Member

Posts: 18




Ignore
« Reply #6 on: February 16, 2012, 11:59:40 AM »

Hello Every Body,


I have some news about my DSP VHF SoundDopplerSoftware
and hardware.

Take a look here for latest news

http://www.eevblog.com/forum/projects-designs-and-technical-stuff/radio-direction-finding/



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