PSK31 newbie receiving problem (RFI in cable)
 

I'm trying to get started in PSK31. When I connect the audio output
from my receiver to the line input jack on my laptop,
computer-generated RFI gets into the receiver. I bought a Rigblaster
Plus but much to my surprise it doesn't provide any isolation for the
receiver-to-computer connection, just comes with a cable to connect
directly.

What can I do.

--
-30-

PSK31 newbie receiving problem (RFI in cable)
 

First thing would be some ferrite cores on the leads. RS has them.
Also, try an audio transformer in the RX audio line. A cheap 600 ohm
at RS will do. If that is indeed the problem, then even a temporary
setup should show a significant improvement. If it solves the
problem, it is easy to build one into a small box.



--
Alan
WA4SCA

PSK31 newbie receiving problem (RFI in cable)
 

Anonymous wrote:
I'm trying to get started in PSK31. When I connect the audio output
from my receiver to the line input jack on my laptop,
computer-generated RFI gets into the receiver. I bought a Rigblaster
Plus but much to my surprise it doesn't provide any isolation for the
receiver-to-computer connection, just comes with a cable to connect
directly.


I'm also some what of a newbie on the digital modes. On my laptop there
is not Line-In just a Mic-In. What I discovered is that on the ring of
the Mic-In was a +5v to power an electric microphone. So what I ended
up doing was making sure that I only used the Tip and Ground. I also
built my own interface in which I had to put a couple of resistors in
the line to reduce the voltage even more as the mic is a lot more
sensitive then the line in. I also got a couple of 600 ohm 1:1 audio
transformers to isolate it even more. But since you are running a rig
blaster you should have an issue with isolation. If you are using the
Mic-In I would build my own cable with a stereo 1/8th jack and leave the
Ring disconnected.

Hope this helps.

Stephen
VE6CPU

PSK31 newbie receiving problem (RFI in cable)
 

"Anonymous" wrote in message
...
I'm trying to get started in PSK31. When I connect the audio output
from my receiver to the line input jack on my laptop,
computer-generated RFI gets into the receiver. I bought a Rigblaster
Plus but much to my surprise it doesn't provide any isolation for the
receiver-to-computer connection, just comes with a cable to connect
directly.

What can I do.

--
-30-

Have a look at the below.

http://members.optushome.com.au/vk6y.../scits430s.htm

Cheers

Peter