Linux-Hams archive - September 1998: Re: sound card connection

Re: sound card connection

Hamish Moffatt (musdpst@mx.dy.fi)
Thu, 3 Sep 1998 23:22:16 +1000

On Sat, Aug 29, 1998 at 10:40:37AM -0700, Jim Darrough wrote:
> If I remember correctly, line in is high impedence, so you might want to get
> a small audio transformer with an 8 ohm primary and a 1kohm secondary,
> connecting the secondary to Line in and the primary to speaker out of your
> radio. Keep the volume level as low as possible. You only need 0db for line
> in, so if you can hear it when it's not plugged in, it's probably too loud.

That sounds about right for the line in, I found a web site which said
600-2k ohms. What about the transmit side, what is the likely input
impedance of the radio? (I don't (yet) have the manuals unfortunately.)

thanks

Hamish

-- 
Hamish Moffatt, StudIEAust              yciafhi.xqshulfjb@mail.dy.fi, dhjgrmy.isjzjbvm@onenetusa.net
Student, computer science & computer systems engineering.    4th year, RMIT.
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