hello all,

has anyone built with any degree of success a station mic switch? i
would like to somehow interface all the rigs in the shack to my heil mic. if
someone would be so kind as to send a schematic and parts list of what they
built i would appreciate it.

BTW, all the rigs i wish to interface to the mic have the same
impedence.

73 mike ku4yp

"KU4YP" wrote in message
news:kkVed.3882$8R.2887@trnddc02...
hello all,

has anyone built with any degree of success a station mic switch? i
would like to somehow interface all the rigs in the shack to my heil mic.
if someone would be so kind as to send a schematic and parts list of what
they built i would appreciate it.

BTW, all the rigs i wish to interface to the mic have the same
impedence.

73 mike ku4yp

Mike -

Projects like this appear regularly in the amateur literature.

Chris Cieslak, AA9HD had a November 1997 QST article, "A simple
microphone/TNC/SSTV Switch" (Adobe Acrobat available to members from ARRL
web site)

The article references a Radio Shack multi-pole switch (275-1386A) -- which
may no longer be available. An old manual serial or parallel connector
switch can be salvaged (tons of this stuff in junk yards allover country)
for the manual (multi-pole) radio switch.

w9gb

Hi,

has anyone built with any degree of success a station mic switch? i
would like to somehow interface all the rigs in the shack to my heil mic. if
someone would be so kind as to send a schematic and parts list of what they
built i would appreciate it.

BTW, all the rigs i wish to interface to the mic have the same
impedence.

One important point is to make sure that the microphone ground (not the
cable screen) is treated as a separate 'live' wire throughout and not grounded
in the switch only in the rigs. Failure to do this can result in hum loops.


Cheers - Joe

Hi,

Oops, I that should read -

. . . and not grounded in the switch BUT only at the rigs themselves.


Cheers - Joe G3LLV