[Elecraft] KRX3 ANT input flexibility

[Greg - AB7R]

Hi Ken!

How about this option.  TMP cable from KRX3 to a BNC on the back of the radio (Use the 
hole for the external ref).  Connect this to the common position of an external two-
position switch.  Then run a TMP cable from the KAT3 where the subRX connects to the 
BNC for the AUX RF. Connect this to one of the two positions on the switch.  Now 
connect your 6M Omni receive antenna to the second input.  

Now you can switch between the unused KAT3 input and the Omni antenna you would 
nomally keep connected to the AUX RF input without having to remove the cover.

Better yet...you can get an automatic switch and use one of the DIGOUT lines to do the 
switching when 6M is selected.

I will probably do something similar.  I also use an array solutions sixpack switch.  
ANT1 feeds one side and ANT2 feeds the other.  This way I can select any of my 
antennas for either antenna input.  I keep the Main antenna set to auto switch with 
the KRC2 and the ANT2 position I manually switch to I can try different combinations.


-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Fri Jun 19  8:04 , 'Ken Kopp' <k0pp at rfwave.net> sent:

>I purchased the KRX3 to monitor 6M while the radio is in use
>on other bands  I connect a 6M omni antenna to the KRX3
>and use the KAT3's #2 antenna to feed a 6M array when
>the K3 is switched to 6M.  The resulting diversity receive
>-is- impressive!
>
>The as-designed choices to select what antenna is routed 
>to the KRX3 is limited (IMHO) and here's my method of 
>achieving more flexibility in using the KRX3:
>
>The BNC(F) to TMP(M) cable is installed in the normal manner
>and is routed to the area atop the rear of the KRX3.  The cable
>from the KAT3 tuner is also routed to the same area.  
>
>I've made a short TMP(M) to TMP(F) extension cable to run 
>from the KRX3's TMP(F) input connector to the same area atop 
>the KRX3.  This allows me maximum flexibility in what source 
>is fed to the KRX3's antenna input by just removing the K3's 
>top cover and swapping connections to suit my need.
>
>The board-mounted TMP(F) jacks are somewhat fragile and if 
>one attempts to "sneak" the extension cable into the KRX3's 
>jack from above and the shell will likely be expanded, resulting 
>in a loose fit.  To keep stress on the jack to a minimum, I secure 
>the extension cable to the knurled nut on the top of the KRX3.
>
>It's -much- easier to make the connection to the KRX3 input
>jack if the KIO3 panel is removed to allow easy access to the
>rear of the KRX3.
>
>73! Ken Kopp - K0PP
>      ElecraftCovers at rfwave.net
>      http://tinyurl.com/7lm3m5
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