[Ham-Mac] Mod to SignaLink SL-1+ for USB Interface

[Dick Kriss, AA5VU]

Lon N3ZKP,

I am glad to hear of your success with the iMic.   After looking over your
comments I question if we are using the same setup.  Do you have an SL-1+
interface between the TS-570 and the computer? I wonder what Mac you are
using. Mine is an old G4 1Ghz AGP with OSX 104.3.  FYI, I use the iMic for
transmit but had to bypass it for receive. Mine works great and I have no
reason to mess around with iMic.

BTW, the number I recall quoting is from the the Kenwood TS-570 users manual
where is says the output to Pin 3 (ANO) is 4.7k ohms.  I have no idea what
the iMic wants to see and never could get direct answer from Griffin
Technology.  I gave up asking questions because they would reply with some
technical mumbo-jumbo about interface to stereo systems.  All I can say is
iMic acted more like an attenuator than an A to D converter to the audio
output from the SL-1+ that was being feed by Kenwood TS-570. The Mac G4 is a
happy camper with the output from the SL-1+ to the microphone - line in port
on the back of the G4.

This impedance mismatch discussion is off the topic.  I posted the note to
share the SL-1+ modification by KG6WTF to add a USB interface.  Carl's mod
with FB pictures can be seen at

http://kg6wtf.gosselinfamily.com/signalink.html

I added a comment that at least one person had major interface issues with
the iMic.  If you are happy with the iMic, the KG6WTF modification may be of
interest.  I think he did a nice job.

73, Dick AA5VU


On 11/13/05 8:09 AM, "Lon Kinley" <majorlk at us.net> wrote:

> Dick,
> 
> << My problem with the iMic is due to some weird impedance mismatch unique to
> the TS-570.  >>
> 
> I still contend you have some other problem. I run the iMic with my
> TS570 with absolutely no problem with any mismatch. Both I/O
> connections run perfectly. The output level from the 570 is set at 6
> and the input level in the Sound control panel is set at the first
> notch.  Output level from the Sound control panel is set at about 1/4
> the way up and the input level on the 570 is set at 2. Perfect copy,
> both ways, on PSK31 and MT63.
> 
> Incidentally, I believe you keep quoting a 1.7 ohm impedence for the
> iMIc but it is actually 1.7K ohms.
> 
> 73,
> 
> Lon - N3ZKP
> Baltimore, Maryland
> 
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