[NLRS] Subject: DEM 222-28 Interfacing ?

[kr7o at vhfdx.com]

Beware that the 706 at least through mkII is noted for putting out a full 
power spike (even with throttled down power).  This spike may not be in 
later mkII models or the MkII-G (haven't researched it).  I almost killed 
the thermistor for my power meter because of it (glad I use input pads).  I 
was able to crank my 706mkII down to 1w and used a 20db pad.  Even with a 
full power spike, the input to the transverter never exceeds 100mw.  My IF 
is set for 1mw, but hitting it with a momentary extra spike should not 
damage the input pad or mixer.  You can use a small SMA transfer relay to 
switch the pad if you have a common IF to minimize parts count.

FB and GL with Rovermania guys.  The amount of activity you guys are 
creating is commendable.  The UHF contest is orphaned here in CA.  The 
records for CA in this contest are in the 3-5000 point range, pitiful.


At 10:07 PM 7/30/2007 -0400, Melvynkc0p at aol.com wrote:


>Subject: DEM 222-28 Interfacing
>
>I now have a DEM 222-28 transverter that only requires 1mW of
>drive. The  Icom 706 shows 4 W out key down on a Bird Wattmeter
>at the lowest RF drive  setting. How do we make up for the
>difference ? That sounds like more than 30  dB of attenuation
>required and then relays around the pad on receive.
>
>What have others done ?
>
>Mel KC0P
>
>
>
>************************************** Get a sneak peek of the all-new AOL at
>http://discover.aol.com/memed/aolcom30tour
>_______________________________________________
>NLRS mailing list
>NLRS at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/nlrs

73, Robert KR7O/YB2ARO, DM07ba/OI52ee  (ex.  N7STU)
kr7o at vhfdx.com

www.vhfdx.com (KR7O/YB2ARO homepages)