[amsat-bb] TS-2000 & external preamps. Caution!

[David Reinhart <wa6ilt@xxxxxxxxxxxxxxxx>]

When I bought an Icom 271H it came with an Icom AG-25 mast-mount
preamp.  Not the best, but it did the trick.  The 271H powered the
preamp through the coax and dropped the voltage on transmit.  The preamp
is *not* RF sensing.

I replaced the Icom with a TS-2000 and got an SSB Electronics DCW-15B
sequencer/bias tee to control and power it.  What is *not* clear from
the TS-2000 manual (Page 96) is that you need to set a "linear amplifier
delay" for each band via the proper sub-menu item under menu number 28.
The default is "off" and I  thought I had to worry about a delay *only*
if I was running a linear.  Wrong!  Without a delay set the rig won't
sink the controller on transmit.  Bye-bye preamp.

I also have an SSB preamp on 70cm but that one does RF sensing so it
didn't burn up, thank goodness.

Dave Reinhart
wa6ilt@amsat.org


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