[Elecraft] K3 - Accessory Jack - How Many Wye Cables?

[Dick Dievendorff]

I use two Ys.  One side of the first Y  goes from a K3  to a KAT500 and then
the KAT500 goes to a KPA500.  The other side of the K3 Y goes to a second Y
that connects to a Top Ten Devices Band Aide and a US Interface Navigator.  

Occasionally with the K3 turned off my Top Ten Devices Band Aide relays buzz
a bit.  I haven't figured out why. But I leave the Band Aide antenna switch
in one of the "non auto" settings when the K3 is powered off.  I think the
solution might  be to power the Band Aide from a power strip controlled by
the K3 power switch, or Y the P3 power connector.  Or perhaps add some
high-Z pullups on the band lines in the Band Aide.  As Don mentions, pullups
can be an issue, particularly when some devices are not always powered.

No problem thus far with band voltages when the K3 is powered on. I leave my
KAT500 powered (although I usually push the front panel power button to turn
the LEDs off).  When the KAT500 has DC power, the Band lines and AUXBUS are
pulled up (using what the microcontroller data sheets call  "weak pullups"),
which draw only microAmperes. The KAT500 sleeps when its power is off, which
is a very low current draw, but it wakes up when you press the DC power
(MODE) button.

73 de Dick, K6KR


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
Richard Thorne
Sent: Monday, May 12, 2014 4:48 AM
To: Elecraft Reflector
Subject: [Elecraft] K3 - Accessory Jack - How Many Wye Cables?

Currently I have a wye cable attached to the accessory jack on the back of
my K3 which in turn is connected to a microham device and the KAT-500 tuner.

I have a need to supply band data to another device, can I connect another
wye to the current wye so I can connect 3 devices to the accessory jack?

Thanks

Rich - N5ZC

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