At 07:50 PM 2/25/98 -0500, you wrote:

>There is a very easy and common way to do this quite cheaply. It involves
>four 1N914 or 1N4148 diodes (regular silicon switching diodes).

>Sean


Not at 900 MHz.  I've been able to hit 400 MHz with some point contact
diodes, but they are on the way down by then.  I've had real trouble
getting above 300 MHz with 1N914 or 1N4148 (or any others such as the
1N4001-1N4007 which people say act like PIN diodes) diodes.  Maybe I'm
doing something wrong, but the on/off ratios are always poor at the higher
frequencies.

How about using one of the diode RF switches that are designed for this
use?  Mini-Circuits has tons of them.  A lot of other people make them as
well.  Has anyone with the test equipment to find out tried any of the more
common diodes at 900 MHz?  I know a lot more of us are going to be working
there soon. :-)

Wynn Rostek

WB4ZUY