KPA1500 and KPA500 set up question

[Earl-3]

Received my new KPA1500 yesterday ordered early March. Yea!!

Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected to
a N6TV Y-BOX.

I now have the KPA1500 connected to the Y-BOX also. All looks good.

Presently the KPA500 powers on when the K3 is turned on.

Is there a setting, that I can't find, to not have the KPA500 turn on
automatically.

I have looked through both config menus and manuals also Fred Cady's book for
the K3.

Thanks in advance,

Earl  N5ZM..

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[John Langdon]

I think you mean the KPA500 is coming on with the K3 but the KPA1500 is not.  

You can run an RCA phono patch cable from the 12V out on the K3 to the REM jack on the KPA1500 and it will turn on when the K3 does.

73 John N5CQ


-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Earl
Sent: Tuesday, June 19, 2018 12:55 PM
To: Elecraft <[hidden email]>
Subject: [Elecraft] KPA1500 and KPA500 set up question

Received my new KPA1500 yesterday ordered early March. Yea!!

Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected to a N6TV Y-BOX.

I now have the KPA1500 connected to the Y-BOX also. All looks good.

Presently the KPA500 powers on when the K3 is turned on.

Is there a setting, that I can't find, to not have the KPA500 turn on automatically.

I have looked through both config menus and manuals also Fred Cady's book for the K3.

Thanks in advance,

Earl  N5ZM..

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[Bob Wilson, N6TV]

On Tue, Jun 19, 2018 at 10:55 AM, Earl <[hidden email]> wrote:

> Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected
> to a N6TV Y-BOX.
>
> I now have the KPA1500 connected to the Y-BOX also. All looks good.
>
> Presently the KPA500 powers on when the K3 is turned on.
>
> Is there a setting, that I can't find, to not have the KPA500 turn on
> automatically.
>

Hi Earl,

It looks like you ordered a v1.3 Y-BOX, so all 15-pins of all five
connectors are wired parallel.  Pin 8 is the "Power On" pin.  Pulsing that
pin low will cause a KPA500 or KPA1500 amplifier to power up.  Powering up
the K3 could cause such a pulse if you have the wrong cable connected
between things.  Pin 8 of the KPA1500 and KPA500 could also be connected in
parallel to each other.

Solution:  use an Elecraft AUX cable, not a 15-pin cable or VGA monitor
cable, between the Y-BOX, the KAT500, and the KPA1500.  This cable has no
connection on the power on pin.

The recommended way to correctly connect these devices together would be:

K3 ACC Port -> 15 pin M/M cable -> Y-BOX input

Y-BOX v1.3 Output 1 -> Elecraft M/F AUX cable -> KAT500 -> 15 pin M/F cable
(or another AUX cable) -> KPA500
Y-BOX v1.3 Output 2 -> Elecraft M/F AUX cable -> KPA1500
Y-BOX v1.3 Outputs 3/4 -> Other devices (Band Decoder, MK2R+, RemoteRig
etc.)


Some Elecraft AUX cables were modified to short Pin 11 (DIGOUT1) to Pin 8
to allow for remote power on.  If you bought the cable second-hand, it may
have been modified to do that.

FYI, for Y-BOX v2.1 (upgrades available), only one Elecraft AUX cable would
be needed to connect all three devices (KAT500, KPA500, KPA1500), because the
new Y-BOX v2.1 has one dedicated "AMP AUX" port, which by default has no
connection in pins 1, 4, 6, 7, and 8, same as the AUX cable).  So it can be
wired like this:

K3 ACC Port -> 15 pin MM cable -> Y-BOX input

Y-BOX v2.1 AMP AUX Output -> 15 pin M/F cable -> KAT500 -> 15 pin M/F cable
-> KPA500
Y-BOX v2.1 Output 2 -> Elecraft M/F AUX cable -> KPA1500
Y-BOX v2.1 Outputs 3/4 -> Other devices (Band Decoder, MK2R+, RemoteRig
etc.)


73,
Bob, N6TV
https://bit.ly/Y-BOX
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