[Elecraft] Hook Up Directions for KX3 and HRD

[Don Wilhelm]

John,

For connecting ANY radio to HRD (or any other application)  for rig 
control,  You connect the computer serial port TXD to the RXD pin on the 
radio, and the RXD of the port to the TXD pin on the radio.  Those are 
pins 2 and 3.  You also must connect RS-232 Signal Ground which is pin 5.

That will get you operational with any (and all) rig control 
applications, not just HRD.

Now then, if you were asking about DM780 (for digital modes), the answer 
is extended - you must provide a path between headphone out of the radio 
to the computer line in soundcard jack - isolation of the grounds 
between the radio and the computer may be necessary for noise (hum) free 
operation.  For audio going the other way, the line out on the computer 
connects to mic in on the radio, but through an isolation transformer 
and an attenuator to reduce the level by about 10 times - line level 
will overdrive the mic input without the attenuator inserted in the path 
- a series 100k resistor and a parallel 10k resistor (on the KX3 side of 
the 100k) will produce a usable attenuator.

Of course, these things are what is done in the digital interfaces 
available from several different sources.
I have spoken in generalities about what those interfaces consist of - 
you can homebrew your own or purchase one of the various brands that 
suits your operation.

73,
Don W3FPR

On 3/16/2012 5:54 PM, John Lally wrote:
> What are the connections and instructions for interfacing Ham Radio Deluxe
> and the KX3?
>
>
>
> Thanks.
>
>
>
> John Lally
>
> W7JJL
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>