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

[David W Wood]

Peter

don't get involved.

The person who is receiving the interference has to define the nature of
it and then report it to the appropriate authorities.
Let them do the spade work.

David

t

In message <6.2.0.14.2.20050920153452.03299988 at mail.adelphia.net>, Pete
Smith <n4zr at contesting.com> writes
>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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-- 
David W Wood