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Greg
Manual switching for A / B / Split is quite easy with a two-pole, =
three-position switch.
I can make a sketch and scan it if you want.
Another option is to use a small audio mixer with each radio going into =
a channel. You can
adjust the amount of audio in each ear for each radio with the faders. =
I know several guys
who do SO2R like this.
If you want some kind of automatic switching, that's another matter. =
Some guys like
to put one radio in both ears while the other is transmitting. Relay =
switching is the easiest
way to do this for most hams.
I prefer a part way solution: while one radio is transmitting, I still =
hear the sidetone, but add=20
some of the 2nd radio audio into that ear -- kinda like moving the 2nd =
radio's audio image from=20
LEFT to LEFT-CENTER. That requires more complicated switching and either =
a resistor=20
network (a kluge) or an audio amplifier (preferrred).
73, Gary
K9AY
----- Original Message -----=20
From: greg richard=20
To: secc=20
Sent: Wednesday, January 10, 2001 11:52 AM
Subject: [SECC] 2 radio audio switch box
Can anybody point me towards a schematic for switching audio for 2 =
radios?
thanks
Greg K4NO
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D3>Greg</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D3>Manual switching for A / B / Split is =
quite easy=20
with a two-pole, three-position switch.</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>I can make a sketch and scan it if you=20
want.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D3>
<DIV><FONT face=3DArial size=3D3>Another option is to use a small audio =
mixer with=20
each radio going into a channel. You can</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>adjust the amount of audio in each ear =
for each=20
radio with the faders. I know several guys</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>who do SO2R like this.</FONT></DIV>
<DIV> </DIV>If you want some kind of automatic switching, that's =
another=20
matter. Some guys like</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>to put one radio in both ears while the =
other is=20
transmitting. Relay switching is the easiest</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>way to do this for most =
hams.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT size=3D3><FONT face=3DArial>I prefer a part way solution: =
</FONT><FONT=20
face=3DArial>while one radio is transmitting, I still hear the sidetone, =
but add=20
</FONT></FONT></DIV>
<DIV><FONT size=3D3><FONT face=3DArial>some of the 2nd radio audio =
</FONT><FONT=20
face=3DArial>into that ear -- kinda like moving the 2nd radio's audio =
image from=20
</FONT></FONT></DIV>
<DIV><FONT size=3D3><FONT face=3DArial>LEFT to LEFT-CENTER. </FONT><FONT =
face=3DArial>That requires more complicated switching and either a =
resistor=20
</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D3>network (a kluge) or an audio amplifier =
(preferrred).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D3>73, Gary</FONT></DIV>
<DIV><FONT face=3DArial size=3D3>K9AY</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:k4no@ispchannel.com"; =
title=3Dk4no@ispchannel.com>greg=20
richard</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:secc@contesting.com"=20
title=3Dsecc@contesting.com>secc</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, January 10, =
2001 11:52=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [SECC] 2 radio audio =
switch=20
box</DIV>
<DIV><BR></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Can anybody point me towards a schematic for =
switching audio=20
for 2 radios?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>thanks</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Greg K4NO</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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