[TenTec] Balanced vs. unbalanced mic

[Robert & Linda McGraw K4TAX]

Good suggestion.

73
Bob K4TAX

----- Original Message -----
From: "Dudley Hurry" <jhurry@austin.rr.com>
To: "Mark Erbaugh" <mark@microenh.com>; <tentec@contesting.com>
Sent: Wednesday, April 24, 2002 9:21 AM
Subject: Re: [TenTec] Balanced vs. unbalanced mic


> Mark,
>
> Let me make a suggestion, Use a GOOD quality commercial audio cable with a
> shield..  Since TenTec uses a floating audio (audio hot and ground are
above
> ground) connect the white to audio hot, black to audio ground, and ground
> the sheild at the radio end ONLY..   Leave the sheild open at the mike
end.
> This should work, with no RF or added noise..  Works for me..
>
> Thanks and 73's,
> Dudley
> WA5QPZ
> jhurry@austin.rr.com
>
>
> ----- Original Message -----
> From: "Mark Erbaugh" <mark@microenh.com>
> To: <tentec@contesting.com>
> Sent: Wednesday, April 24, 2002 8:21 AM
> Subject: [TenTec] Balanced vs. unbalanced mic
>
>
> > I'm still considering remote (20+ feet) operation of my Pegasus. Based
on
> > some previous replies on this forum, Canare Star Quad cable was
> recommended
> > for running mic level audio, so as to minimize interference being picked
> up
> > by the long cable run.  I've researched this and found that the reason
for
> > Star Quad cable's noise immunity is that when used for balanced audio,
the
> > noise pickup on each pair of  + and - leads tends to cancel, in much the
> > same way as how coax keeps the signal in and noise out.
> >
> > I also discovered that with a balanced signal, similar results can be
> > obtained using ordinary CAT 5 network cable. I happen to have a lot of
CAT
> 5
> > cable so that would be my preference.
> >
> > However, I believe to get the noise immunity, I must somehow convert the
> > unbalanced mic output (TT 705) to balanced, run through the cable and
then
> > unbalance it for input to the Pegasus. I did find a simple schematic for
> > feeding a balanced source into an unbalanced input. I wonder if there
are
> > similar circuits for converting  the other way?
> >
> > Any suggestions?
> >
> > Thanks and 73,
> > Mark
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec