[1000mp] Sound card interface to FT-1000MP mic input

[Robert Dorchuck W6VY]

The question was the speaker output from the sound card
and they are 8 ohms.  Agee if the line out is used.

Bob  W6VY


--- Pete Smith <n4zr at contesting.com> wrote:

> Depends.  Every sound card I've dealt with has had a 600 ohm line
> output, which either drive amplified speakers or could be connected
> directly to a line level input.  The big thing you need to feed the
> line output of a typical sound card to an MP mike jack (I do that
> here) is an isolation transformer and a roughly 10:1 voltage divider
> to get the level down to what the mike input can handle.
> 
> 73, Pete N4ZR
> 
> At 09:38 AM 9/20/2005, Robert Dorchuck W6VY wrote:
> >The sound card speaker output is 8 ohms.  Mic input on the MP is 600
> >ohms.  I would use a 8:600 ohm transformer.  I do not think 1:1
> would
> >be appropriate.  Available at Mouser, etc.
> >
> >Bob  W6VY
> >
> >
> >--- "A.J.C." <n2ki at amsat.org> wrote:
> >
> >> Dave,
> >> 
> >> You can use the 1:1 isolation transformer from Radio Shack.  They
> are
> >> fine.
> >> 
> >> Tony - N2KI
> >> SYSOP - N2KI DX CLUSTER
> >> dxc.n2ki.com:7300
> >> RF Gateway 145.650
> >> Website: www.n2ki.com
> >> DX Spoken Here
> >> 
> >> 
> >> > -----Original Message-----
> >> > From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-
> >> > bounces at mailman.qth.net] On Behalf Of Dave Hawes
> >> > Sent: September 20, 2005 05:35
> >> > To: 1000mp at mailman.qth.net
> >> > Subject: [1000mp] Sound card interface to FT-1000MP mic input
> >> > 
> >> > Can anyone suggest an appropriate audio isolation transformer to
> >> use
> >> > between a computer sound card speaker output and the microphone
> >> > input
> >> > on the MP?  This will be used for contest voice memory keying. 
> >> Radio
> >> > Shack, Mouser, DigiKey, etc. all would be OK.
> >> > 
> >> > Thanks in advance.
> >> > 
> >> > 73 - Dave N3RD
> 
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