[Elecraft] CIRRO MAZZONI BABY LOOP ANTENNA

[Greg Troxel]

KK2L <kk2l at comcast.net> writes:

> Good Afternoon All,I have a Cirro Mazzoni Baby loop antenna and would like to
> take advantage of the RS232 module with my KX3.  Of course, I have no
> problem with this interface using my K3.  But I was wondering how one would
> go about creating a RS232 interface using the KX3.  Would a simple RS232 DB9
> 9 Pin Female to USB 2.0 PLC Serial Straight-through Cable work with the KX3? 
> It seems so but I can't figure out how to get from the USB end of that cable
> to the ACC input.  Am I looking at this the right way?ThanksMarkKK2L

Two separate comments:

  As I understand it the KX3 has a serial port, used for control and
  firmware updates, but it's a mini stereo phone plug.  This is what's
  on the end of the KXSER and KXUSB.

  Be careful about "RS232" vs "TTL level serial".  True RS232 has
  voltages from +3 to +15 (or +25, depending where you read about it) V
  and -3 to -15 (-25) V.  What is typically used is "TTL serial", which
  has 0V and 5V (for a 5V system; sometimes it is 3.3V).  Input circuits
  may or may not tolerate the higher voltages.  On a RPI you should
  definitely be careful


It appears that the Elecraft serial ports are ok with the full range
possible with conforming RS232 signals on receive, but use 9V
(conforming) and 0V (not conforming) on transmit.  That is almost
certainly ok because there is so much "TTL serial" that a robust
receiver has to treat 0 V like it is -3 V.

  http://elecraft.365791.n2.nabble.com/KX3-ACC1-interface-logic-signal-levels-what-is-quot-official-quot-Elecraft-standard-for-this-td7563052.html