[WriteLog] bandwith for rtty

2002年1月13日 08:17:00 EST

I operated the ARRL RTTY contest with the following set-up:
Yaesu FT990 set to LSB
AF Out on radio to the sound input jack on Compaq Presario computer (not the 
microphone input)
TU type = Sound Board AFSK
45 Baud (60 wpm baudot)
I have four filters on the radio. I found that I could copy consistently 
using the widest (2.4K) filter, generally OK using the 2.0K filter, and not 
at all with the narrower (.5 and .25) filters. This meant that I could not 
isolate any of the weaker signals. 
Using a regular set-up for RTTY (i.e. using the TU to decode the signals) I 
can use the .5 filter. I suspect that I am missing something here. Singal 
levels at the RTTY jack and AF out jack are the same (100mVrms at 600 ohms). 
Can anyone help me on this? 
73 de Jay
W2KD