[Elecraft] P3 question

[Joe Subich, W4TV]

 > The RS232 line also connects in parallel to a MicroHam router,
 > and a SteppIR SDA100 controller through Y splitter cables.

microHAM interfaces should *never* be connected to K3/P3 through
a Y cable.  The proper connection is the DB9 (marked "CAT")
lead of the microHAM cable set should connect to the P3 "PC"
jack and the P3 "XCVR" jack should be connected to the K3 RS-232
jack using the Elecraft supplied cable.

As with any other RS-232 device, the microHAM <-> P3 connection
can not withstand the load of a second receiver or inactive
transmitter.  Connecting two TxD sources to any RS-232 device
will result in improper operation (no data).

73,

    ... Joe, W4TV


On 10/3/2013 9:23 PM, Garry Shapiro wrote:
> I have had a P3 for some time but only very recently did I build it and
> install it, and only now am I trying to learn it.
>
> The first problem encountered is as follows. I tried QSYing the K3 to a
> marker
> frequency, but no QSY occurs when either marker is selected and the
> Select knob is tapped. Yes, there is an RS232 connection between the K3
> and P3. The RS232 line also connects in parallel to a MicroHam router,
> and a SteppIR SDA100 controller through Y splitter cables. So I asked
> myself  "Are these additional breakouts preventing QSY to the marker
> frequency?" To answer, I disconnected the MicroHam and SteppIR
> controller, with no difference.
>
> Am I missing something here? Is there an enabling configuration
> selection in the K3?
>
> Garry, NI6T
>
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