[Johnson] Two sugjects: Johnson Signal Sentry. Possible source of TVI?

[Glen Zook]

A simple solution is to make what is called an
"iso-Tee".  To make one, use a "normal" UHF "T"
connector that has the male connector on the stem of
the "T" and has two female connections.  Using a drill
bit that is the same diamter as the hole in the
insulation of the connector, drill out the "fingers"
of one of the female sides.  Make sure that you get
all the way to the bottom of that side.

Connect the male side to the transmitter and the
antenna connection to the "good" side of the "T". 
Then using a length of coax with the "normal" UHF male
on the end plug this into the modified side of the
"T".  Make sure that the plug doesn't come in contact
with any metal.  If it doesn' then trim the center pin
of the UHF plug slightly so that no connection is
made.  Connect the other end of the length of coax to
the monitor.

This type of arrangement has been used for decades to
tune VHF and UHF duplexers with "normal" signal
generators while the transmitter is in operation.  The
basic fact is that there is a very small capacitor
created between the modified "T" connection and the
center pin of the coax connector inserted into the
modified "T".

Glen, K9STH



--- Philip Atchley <beaconeer@elite.net> wrote:

My alternate approach is to put a PL-259 Tee on the TX
side of the coax switch, poke a little screw in the
extra side and wrap the insulated pickup wire around
the screw as a "gimmick" capacitor.

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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