[Elecraft] KPA500 question

[Joe Subich, W4TV]

You might try isolation diodes between the antenna switch and/or
KPA and the K3.  If the KPA is not band switching with the RCS-12
connected, I would suspect the RCS-12 is loading the band data
lines.

How are you connecting the RCS-12?  Are you using the "Yaesu BCD"
connections?

73,

    ... Joe, W4TV



On 6/14/2011 11:24 PM, Dave Perry wrote:
> Gary,
>
> Good suggestion.  I removed the cable going to the antenna switch and now the K3 and KPA500 appear to talk to one another when changing bands.  Pushing a band button on the amp changes the amp and the K3 to the new band.  I still cannot get the two power levels to work.  I also need to figure out how to get the band switch working with the Y cable.
>
> Dave, N4QS
>    ----- Original Message -----
>    From: Gary Gregory
>    To: Dave Perry
>    Sent: Tuesday, June 14, 2011 10:12 PM
>    Subject: Re: [Elecraft] KPA500 question
>
>
>    What bothers me is the amp was not switching bands you said?...If the OPER switch is set then the aux cable should allow you to switch bands either way and the amp should indeed switch bands and indicate that on the LCD.
>
>
>    Unfortunately, my FT unit has the original I/O board so I can't verify this for you...sorry
>
>
>    remove the antenna switch and try see if that makes any difference.
>
>
>    Gary
>
>
>    On 15 June 2011 13:02, Dave Perry<n4qs at comcast.net>  wrote:
>
>      Gary,
>
>      No, I did not remove any pins on the cable.  This is the one supplied by Elecraft and I figured that it would be good to go.  I just checked the cable and five pins have been removed.  I just removed the Aux Cable from the back of the KPA500 and now the band buttons work on the amp.  So it does appear that the Aux Cable is the culprit.
>
>      Dave
>        ----- Original Message -----
>        From: Gary Gregory
>        To: Dave Perry
>        Sent: Tuesday, June 14, 2011 9:49 PM
>        Subject: Re: [Elecraft] KPA500 question
>
>
>        Do you have PIN 10 removed on the KPA-500 end of the Y cable?
>
>
>        Gary
>
>
>        On 15 June 2011 12:33, Dave Perry<n4qs at comcast.net>  wrote:
>
>          My KPA500 sn 70 arrived tonight (factory assembled).  It took just a few minutes to hook up and get it on the air.  I am using the Y cable on the ACC port to split off two cables from the K3 ACC port -- one goes to a new RCS-12 Automatic Antenna Switch and the other goes to the KPA500.
>
>          I have AUX BUS on the KPA500 menu turned on and Band Change set to normal.  If I press a band button on the amp, the K3 changes bands and so does the new antenna switch -- pretty neat.  But the band display on the KPA does not change.  I have to hit the key and transmit to get the band to change on the KPA500.  This does not seem correct.  It would seem that pressing any on the band buttons on the amp should change the band on the amp and the frequency display as well.
>
>          Likewise if I change bands on the K3 or via my logging software, the K3 and antenna switch change bands, but the KPA500 does not.  I have to tap the paddle and transmit to get the KPA500 to change to the correct band.  I am wondering if there is a problem with the Aux Cable.  Any other suggestions?
>
>          I am up to date on firmware for both the K3 and KPA500.
>
>          The amp runs very quiet and is silky smooth in full QSK mode.  I just need to get the band changing issue resolved.  Any help would be appreciated.
>
>          Thank you.
>
>          Dave, N4QS
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>        --
>
>        VK4FD - Motorhome Mobile
>        Elecraft Equipment
>        K3 #679, KPA-500 #018
>        Living the dream!!!
>
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>    --
>
>    VK4FD - Motorhome Mobile
>    Elecraft Equipment
>    K3 #679, KPA-500 #018
>    Living the dream!!!
>
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