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BIAS TEE INFORMATION
The LDG Electronics RT-100 does not come with a bias tee; it must be supplied by the
customer. While the LDG Electronics RC-100 is a perfect companion to the RT-100, and
includes a built-in bias tee designed specifically for use with the RT-100, some hams may want
to use their own bias tee.
A bias tee is a circuit which injects DC power onto the coax feedline, while isolating the DC
power from both the transmitter and the antenna. A sample schematic is shown here:
Alternatively, ready-made bias tees are available from a number of suppliers, including the
SGC 54-70 DC Coaxial Line Isolator, the Array Solutions Bias-T Master, and many others. The
only requirement is that the bias tee is rated for 1A current draw, 1.8 to 54 MHz. For more
information on bias tee construction and theory, see the Wikipedia article “Bias Tee” at
http://en.wikipedia.org/wiki/Bias_tee, ARRL’s QST article in the January 2013 issue, Vol. 97,
Issue 1, p46, or the Array Solutions Bias-T Master product review in QST, September 2009.
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