On Sat, 26 May 2007 18:45:36 -0400, "Robert11"
wrote:

Hi,

I have two scanners, which I would like them to share a single (Scantenna)
antenna in my attic.

Only one scanner will ever be on at any time.
But, I would like to "permanently" have both scanners attached to the single
antenna.

What would you recommend as a reasonably low cost splitter for this ? (is
Splitter the right term ?)

Hi Bob,

A coax T connector comes to mind.

What type of losses would I expect ?

3dB

Just out of curiosity, would the losses be the same if I was actually to use
both scanners at the same time compared to just one of them ?

Through considerable effort you could recover that 3 dB, but I presume
your scanners will operate over a considerable expanse of spectrum.
This diminishes that effort.

Now, if your scanners operate: one is high bands, the other low bands;
then you can get more ingenious by building two filters. One would be
high pass, and the other low pass, both with roll-offs at the
frequency that separates high from low. The antenna feeds them both,
and each feeds the appropriate scanner. In essence, this is your
splitter (or you can buy one for $50). This would also bring back the
3dB otherwise lost.

The T connector could cause one scanner to inject noise into the other
one. There is very little isolation of the Local Oscillator from the
front end, and you could hear one cycling through the bands on the
other scanner (and, of course, vice-versa). Turn one off and that
goes away. It's cheap enough to test first before going further.

73's
Richard Clark, KB7QHC