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

[Steve - VA3SPH]

Hi Dick:

I am using the Signalink SL+ 1 connect to an iMic the radio is a  
Kenwood TS-2000 via the acc2 port. The manual says the Kenwood has an  
impedance of 10k ohms which is even higher than the 570.  So I don't  
think it an impedance mismatch.

My guess (and this is only a guess) is you where driving audio too  
hard into the iMic and it was shutting down.  It will appear to do  
this if it finds the level is way too high.  The appearance is the  
you have very low distorted audio as you turned it up it worked  
harder to put voltages down.  It would appear as if you could never  
drive it loud enough when in fact you need far less power to drive it.

Anyway hope you give it another go.  I think you will find the  
solution but it is tricky sometimes as you have level settings in  
Radio, levels in Signalink, and even level switch on iMic.

Many thanks for the link on Carls mod.
Good mod if your interested in reducing RF into AF signal.
My Inverted-V is not very far away from my station and have this  
problem at higher RF watts.  Good mod for me or anyone who wants a  
cleaner signal really.

Cheers,

Steve - VA3SPH

On 13-Nov-05, at 9:51 AM, Dick Kriss, AA5VU wrote:

> 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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>
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