[Elecraft] Use of KX3 on 630m

[Edward R Cole]

I recall this topic was discussed a year ago or so.  I have tested 
the Rx and it seems to well (almost equal with the K3).  But do not 
recall if the KX3 can transmit below 160m.  Recall that the BC 
filtering was modified to increase sensitivity below 550-KHz.

I'm guessing transmitting with the K3 is too complicated a 
modification in other than the TEST mode.  Actually not hard to make 
a driver using a good old 2N2222 driven by the K3 at 1 mw.  Follow 
that with transistors that will boost power into watts to be followed 
by a 100w amp.

I think some experimenters should explore modifying 100w stereo amps 
to pass 472 KHz.  remove the audio input and output transformers and 
use capacitive coupling.  Might surprise how easy that might be.  Any 
of you old tube guys ought to still find some tube Hi-Fi amps out there.

Easy start antenna for 630m is the T antenna using an 80m or 160m 
dipole or inverted-V.  Short coax feed shield to center conductor 
which converts it to a vertical with top hat.  You will need a base 
loading coil to transmit but probably Rx with this simple set 
up.  The NDB beacons operated from 200-518 KHz and used a 300-foot 
top wire with 60-foot vertical wire to the center.  Wire was tuned 
with inductive coupling coils.

There are still many NDB still operating in AK.  I have copied one as 
far as 1000 mi out on the Aleutian chain.  Use of a SDR is handy for Rx.

There are 45 operators on 600m with the ARRL Experimental Group:
http://www.500kc.com/

73, Ed - KL7UW
   http://www.kl7uw.com
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