On 19/11/2023 23:20, elecraft-requ...@mailman.qth.net wrote:
Hi All, I have taken my Kpod from my K4
and put it on my K3. (I assume it works for both rigs). The K3 has had
the Mod completed as per the Kpod manual with a 6.8 Ohm, 1/8 W Leaded
Resistor as per pages 16-18 of the Kpod manual. Problems. 1. Kpod does
not power up with the Data cable between K3 & Kpod connected (No leds
lit up at all. 2. When I power Kpod with a 12v source the On led shows
as does D1 - D3 when switched with the rocker switch. 3. The large
tuning knob on the Kpod does not function in any way. I have tested the
Data cable with a network tester it is wired correctly 2-6 pins only and
they show satisfactory on the tester.
The RJ45 connector on the bottom seems to be a "manufacturing connector"
that later got re-used to support the K-POD. Originally, it would be
able to program the main processor of the K3.
Exactly how this works is on sheet 4 (of 7) of the K3 Front Panel - MCU
schematics, where this connector is labelled "J3 - ICD-2".
The name ICD-2, as well as the names of the signals on this connector -
MCLR, PGD, PGC - are familiar if you do microchip programming and they
go directly to U1 PIC18LF8722 which is the main controller for the front
panel.
My recommendation would be to open up the KPOD (for which schematics can
also be downloaded, as well as for the K3 itself) and check if you
actually get 5V, and GND correctly from the K3. I suspect that the cable
is reversed or the "wrong" pin1 is clipped.
I would resist the temptation to make a cable that is rolled. The
signals go directly to the processor and measuring, instead of changing
the cable.
These flat cables have a "flat" side and a "seam side. On my
Elecraft-supplied cable, one end has the seam up and the other end has
the flat up.
Also, if the R82 mod (6.8ohm resistor) is not fully connected then pin6
will not carry 5volts as soon as the KPOD is connected since the KPOD
draws more current. Having said that - the fact that the KPOD powers up
with an external 12V supply but then still doesn't communicate suggests
an issue with the cable even though your description is pretty good.
What software version is your K3 running? Manual says 5.54 minimal for
KPOD support.
Geert Jan
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