wrote in message
ups.com...
Hi--

I have a Realistic DX-160 in very nice conditiion I bought about 10


1) The DX-160 has an Antenna trim knob, so is a preselctor redundant?
2) The 9:1 matching impedance transformer is intriguing, but can they
be found/purchased already built?

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The trim knob is just a variable capacitor, which is somewhat what
the preselector is. The preselectors also use inductors in combo with the
variable cap. for the various bands. Personally Id use an MLB (matching
xformer) This will keep the input impedance to the radio fairly constant
around 50-70 ohms from your antenna. The better the impedance match
the more current will flow from the antenna to the radio. They have ready
made ones, I have a Watkins MLB that I dont use anymore if you are
interested.


Jeff