Digital modes information

How to hook your PC to your transceiver:


WARNING:

Make sure to get 100% isolation between your transceiver and the computer ! I have a Yaesu FT-100 and connected it via de data connector to the audio of the pc without a 1:1 audio transformer.
I had this working fine over a year when suddenly there was a RF feedback somehow and the internal CPU was blow out. Damn ... 150 euro'sof damage.
The supplier told me Yaesu is the only company that builds rig's without proper CPU safety.

Nowaday's I work 144 MHz EME and all audio and PTT switching is done by relais and 1:1 transformers. No earth connection is to be found between the Yaesu and the computer.
It's just that you know it!

A great way to make qso's is by using your computer. Even a simple 486 with a soundblaster-16 will work fine. The interfaces as drawn below does not guarantee 100% isolation to avoid damage to your transceiver. Best is the use of 1:1 audio transformers like used in old 9k6 modems.

For RTTY i use the program MMTTY by Zakanaka.
For SSTV i use JvComm32. This also supports the FAX mode.
For PSK31 i use WinPSK version 2.22
A simple connection is as follows;
interface PTT

soundblaster interface

Connecting a Yaesu FT-100 CAT interface to your computer RS 232 connector:

Save out money and get a free MAX232 as a sample via www.maxim-ic.com
The datasheet for the MAX232 can be downloaded here: max232.pdf

Programs for CAT control with the FT-100 are TRX manager and FTBasic.

Digital modes can be heard on;

SSTV:
80 m    3730 - 3740 kHz   call  :  3730 kHz
40 m    7040 - 7045 kHz     ,,  :  7045 kHz
20 m   14225 -14235 kHz     ,,  : 14230 kHz
15 m   21335 -21345 kHz     ,,  : 21340 kHz
10 m   28660 -28700 kHz     ,,  : 28680 kHz
 2 m         144500 kHz     ,,  :144500 kHz
RTTY:
80 m    3580 - 3600 kHz   call  :  3580 kHz
40 m    7035 - 7045 kHz     ,,  :  7040 kHz
20 m   14080 -14100 kHz     ,,  : 14080 kHz
15 m   21080 -21150 kHz     ,,  : 21080 kHz
10 m   28080 -28150 kHz     ,,  : 28100 kHz

PSK31:

 1838.0 kHz	   
 3580.0 kHz    
 7035.0 kHz    
14070.0 kHz   
18100.0 kHz
21070.0 kHz    
28080.0 kHz    
  144.6 MHz 



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