> What kind of isolation diodes would you suggest?
Any switching diode (1N4148, etc.) would be fine.
> Any how should they be connected?
As any set to isolation diodes ... two diodes per data line (A,B,C,D)
cathodes to the K3, anodes to the RCS-12 and KPA-500.
73,
... Joe, W4TV
On 6/15/2011 12:11 AM, Dave Perry wrote:
> Joe,
>
> Yes, I am using the four pins corresponding to Band 0 through Band 3
> plus the pin for ground. The RCS-12 works fine connected directly to the
> ACC port on the K3. It also works fine when the KPA500 is connected via
> the Y cable. It is just that the KPA500 is not switching bands when
> connected with the RCS-12. So your suspicion may be correct. What kind
> of isolation diodes would you suggest? Any how should they be connected?
>
> Thank you.
>
> Dave, N4QS
>
> ----- Original Message ----- From: "Joe Subich, W4TV" <li...@subich.com>
> To: <elecraft@mailman.qth.net>
> Sent: Tuesday, June 14, 2011 10:43 PM
> Subject: Re: [Elecraft] KPA500 question
>
>
>>
>> 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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>> ______________________________________________________________
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>> Please help support this email list: http://www.qsl.net/donate.html
>
>
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