The ones I have taken apart are just simple mechanical switches
and as such should work fine down to DC. Isolation at VHF and
UHF is typically a minimum of 75dB. At 1.8 MHz its probably
in excess of 100dB. These should make very good RX switches
for topband.
Mike, W4EF................................
----- Original Message -----
From: "Ronald Gorski" <R.Gorski@astronautics.com>
To: <kb5njd@arrl.net>; <topband@contesting.com>
> I have used this type of switch for years with varying success. The older
> style (square pushbuttons) of A/B or A/B/C switch has a more positive
> "feel" when the switch engages. The newet style is a bit more "mushy".
Both
> styles have significant isolation when used to switch receive antennas
> and/or preamps. I have had some switch failures through the years but have
> never disassembled same for failure analysis; just replaced the switch as
> the cost is low. Ron N9AU
>
> At 09:39 PM 9/2/03 -0500, John Langridge wrote:
> >I think someone mentioned quite a while ago that they used a simple radio
> >shack A/B or A/B/C pushbutton switch designed for vcr/cable to switch
their
> >receive antennas. I skimmed through the archives hoping to chance upon
the
> >thread but suspect that the mention was only incidental, embedded within
> >another thread.
> >
> >Has anyone actually used one of these switches successfully for this
> >purpose? Could the fact that they are advertised as "high isolation"
> >indicate that these are not just simple switches and may not pass a
signal
> >in the HF/MF range?
> >
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