Installing and changing the Configuration file and Teletext pages

Installation :
To install the Configuration file jumper JP7 remains in the Run postion.
Furthermore you need the following files:
fwtool.exe
cygwin1.dll
mimimal.txt    This file has been named by Stefan minimal.txt, but can have any name.eg on4fin.txt or on4fin.conf..In here are all necessary parameters for the
                     Tx..
                     You can change these parameters by opening minimal.txt in Wordpad.See "Changing the Configuration file".
teletext.o       This file contains the teletext parameters.More info under "Changing the Configuration file".
textpic2.mpg  This is the (non-standard)testcard.More info under "Making your own testcard".
download.bat This file contains the following instructions:  fwtool -d /dev/com1 -c minimal.txt -W
                      If you use comport 2 you have to change this into /dev/com2
                      Minimal.txt can be changed and renamed.More info under"Changing the Configuration file".

Remark: These files have to stay in one directory,but you can also place all unzipped files from FWTools_Utils including Fwtool.exe in one directory.

Now click on the download.bat (or goto a DOS window and type the instructions) and you will get a DOS window showing you the following information:

D-ATV firmare tool (c) 2001-2002 Thomas Sailer HB9JNX
Then a row of startcodes,followed by
FPGA Version DVB-S 20021130233527
Writing FPGA bitstream...
Writing MPEG Encoder Firmware...
Writing configuration Area...
Checksum mismatch address 0x800000 length 10152(0x1445, 0x5382)
Reprogramming...
Writing TS Table Area...
All ok!

The text in the DOS window will look like this.It depends on the amount of new information that has to be loaded.
I prefer to go directly to the DOS window (Start-Bureau accesories-prompt)and type: fwtool -d /dev/com1 -c on4fin.txt -W.
The advantage of working directly in a DOS window is,that you immediatelly can see what happens in case something goes wrong.If you use the download.bat the window pops up,but disappears directly if something goed wrong.Things go wrong if you made eg a typing error in your config file or
a wrong testcard name etc..

.
Now Power off
Power on
and your configuration file has been installed.

Changing the configuration file:
To change the configuration file you can start eg with minimal.txt.Open the file in Wordpad and change the Frequency.FEC,symbol rate and Callsigns.
I work mainly with a SR = 6000 ,a FEC=3/4 and a datastream=4500k.The max Bandwidth with these parameters is abt. 8 mHz.
During a qso I can change the Frequency and the FEC by using a Terminal program like Hyperterminal.exe.You can download that from Microsoft for free.
Later on a more information abt the use of Hyperterminal.

Minimal.txt is a file with indeed minimal parameters like eg the Symbol Rate.Most digital Receivers do not work well with a SR less than 4000k.
With a SR = 4000k you have ,using QPSK,8000kb/s available for the datastream.You have to distract abt 500kb/s for system information like PID's etc.
and teletext.
I changed the SR ,the video input to S-VHS and the callsigns to mine.The picture sharpness is much better using the s-video input and setting the
"spatial filter" to sharp.In this case the video cut-off frequency is 6 mHz.Setting the video input to composite and the "spatial fillter" to sharp is not as sharp as composite video can be.The video cut-off frequency is 3 mHz and that should be around 4 mHz.(Stefan is looking after it.).You can have a look here.
If you want to experiment with these settings ,you have to change the testpicture name into testpic2.mpg.
The parameter "spatial filter" can be adjusted at soft,normal or sharp.
To install a new configuration file look at "Installation".
Do not forget comma's or destimals,otherwise the installation will not work.
Best is to give your new file another name like on4fin.txt or on4fin.conf and do not forget to change the new name in your download.bat if you intend to
use the download.bat.

Changing Teletext:
Rename the file teletext.o and teletext.c so that you still have them as a backup in case something goes wrong.
Open teletext.c with Wordpad and type your own text.A maximum of 48 characters on a line are alowed and 24 lines beneath the word pg_header.
Save the file as teletext.c and compile it into teletext.o.To do so goto the DOS window and type:
vmas -c -o teletext.o teletext.c
You will find now a new teletext.o in your directory and you can activate the file by installing your configuration file.See"Installing".
Compiling goes well in a Windows98 Se window but not in a Windows XP window.To make it possible in XP I copied a DOS 6.2 version on my FT32
partition of my Hard Disk.After clicking MSDOSSHELL all worked fine.

Using Hyperterminal.exe
With Hyperterminal (and I think with every Terminal program like eg Term.exe)you can change several parameters on the Fly.
Settings are :
baudrate                      19200
comport                       com1 (of 2)
databits                        8
Pariteit                         geen
stopbits                        1
Datatransportbesturing  geen

You have to use a "straight" rs232 cable between your Baseband print and comport.
Adjusting the frequency and/or FEC works immediatelly .After switsching off the tx and on again ,your frequency and FEC will be the original ones that are
defined by your configuration file.

Typing the letter P shows all your parameters that are loaded at startup of your tx.

73 Arthur

                                                                                                                                                                                                              10-03-2003