[NLRS] Help for W9HQ w Elecraft XV-222 t'verter

[kr7o at vhfdx.com]

If the 746 is like most Icoms, there will be a leading FULL POWER spike for 
a few milliseconds, even if the power is turned down.  This can easily 
damage transverters, preamps, power meters....  You can try adding a fixed 
ALC voltage to lower the power, but make sure and test thoroughly.  The 
other option is to use a high power attenuator in line.  I did that with my 
706 for an IF.  I needed 1mw so used a 30db pad rated for the full 25w and 
small SMA pads to get down to 1mw.  It sure wastes battery power, but will 
protect the transverter.



At 03:23 PM 6/12/2009 -0500, Todd Sprinkmann wrote:


>     I'm passing along this message to NLRS from new EN43 guy W9HQ, David.
>David is all set up on 6, 2 and 432, from a ridgetop location near Westby,
>WI.   He's having a bit of trouble and here's his message:
>
>     Hello all,
>
>Time is short, but I'm struggling a bit to get an XV222 and IC-746 to play
>together for the contest tomorrow.  I believe I have all the jumpers set up
>correctly for up to 8 watts of drive and the 200 msec delay on transmit
>switching.  I am receiving okay, but every time I key up to transmit it
>kicks the XV222 into its input overload condition.  I've turned the IC-746
>output all the down, but according to my meter I'm still putting out about
>10-12 watts on 28.100 MHz.
>
>If this is going to play in the contest I've got to come up with a scheme to
>get some attenuation on the transmit input while not clobbering my receive.
>If anybody has an idea I can try, please respond directly.
>
>Thanks and 73,
>
>David  W9HQ
>
>     If you have any tips or hints for W9HQ, email him directly at
>thepalmhq at gmail.com
>
>     Thanks, 73,
>     Todd  KC9BQA
>
>
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73, Robert KR7O/YB2ARO, DM07ba/OI52ee  (ex.  N7STU)
kr7o at vhfdx.com

www.vhfdx.com (KR7O/YB2ARO homepages)