digital via Tigertronics SL 1 +

[John Wiener]

After reviewing the archives, I found little to help me hook up the  
SL 1 + interface to the K2

My mic connector is configured for the Heil Pro Set K2
Since is has a mono mini-phone jack for PTT, I figured I could use  
that line to the interface.
I still need >6VDC to power the interface but the rating of voltage  
from the mic connector is 5 VDC ( when I measure it, it more like 3  
VDC).

There are a number of jumper configurations within the SL 1+ but the  
K2 isn't listed.

If anyone with experience with this interface would like to help out,  
I would greatly appreciate.
(the company doesn't answer emails...only phone calls, which are  
difficult for me to do at work)

Thanks!

John
AB8O
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[Don Wilhelm-3]

John,

Plan to use a separate power supply for the interface.  The 5 volt line at
the mic jack is only intended to provide bias for an electret mic element (a
non-critical application in most cases).  The 5 volt supply from the K2 can
contain a lot of digital noise since it also powers the digital circuits for
the front panel, and you don't want that coupled into your mic AF signal
line.  Provide your interface with a clean source of DC and it should be
happy.  Many 9 volt wall wart supplies are available.  If your house is
anything like mine, there are such supplies laying around from defunct
telephones, and other consumer devices.

You need to connect the mic PTT either in series with the interface PTT or
in parallel with it.  The ideal interface would provide switching from the
Mic to the soundcard, you will have to look at the provisions of your
interface, many allow you to plug the mic into the interface and the
interface goes to the transceiver mic connector.

What wiring you use will depend on how you have the K2 microphone
configuration header plugged.  With the Proset-K2, you likely have the
header jumpered straight across and the 5.6k resistor between pins 1 and 6
of the mic jack.  That bias resistor may or may not interfere with your
interface operation (hopefully the manufacturer allowed for that and
provided DC blocking on the AF line).

If your interface has a set of plugging information, you mmight want to
select the Kenwood set - it is similar to the Elecraft.  For details of
which pin connects to what signal, consult the KSB2 manual, it contains
information on plugging for different microphones.

73,
Don W3FPR

> -----Original Message-----
>
> After reviewing the archives, I found little to help me hook up the
> SL 1 + interface to the K2
>
> My mic connector is configured for the Heil Pro Set K2
> Since is has a mono mini-phone jack for PTT, I figured I could use
> that line to the interface.
> I still need >6VDC to power the interface but the rating of voltage
> from the mic connector is 5 VDC ( when I measure it, it more like 3
> VDC).
>
> There are a number of jumper configurations within the SL 1+ but the
> K2 isn't listed.
>
> If anyone with experience with this interface would like to help out,
> I would greatly appreciate.
> (the company doesn't answer emails...only phone calls, which are
> difficult for me to do at work)
>
> Thanks!
>
> John
> AB8O
>

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