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<n...@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<n...@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!!!
>
>
>
>
>
> --
>
> VK4FD - Motorhome Mobile
> Elecraft Equipment
> K3 #679, KPA-500 #018
> Living the dream!!!
>
> ______________________________________________________________
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