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K2 KAT2 pad B problem

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Jay S

K2 KAT2 pad B problem

Hello, I'm having a problem with my KAT2. I have built the board and
I'm on page 17 of the manual where you measure the voltage at pin B.
I always get 0 volts here. Here are some other observations:

I have the ATU menu set to CALn, Power set to 5.0, frequency set to 7.100Mhz.

After pressing tune:
pin B = 0V
U4 pin 5 = 3.8V
U4 pin 4 = 0V
C55 setting 009

With an external wattmeter between the dummy load and Ant 1, it reads 6.5W.

Any ideas where to look for the problem?

Thanks & 73
Jay
W9IUF
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Jay S

Re: K2 KAT2 pad B problem

I'm sorry, I mean U1 (the PIC 16C77), not U4. U1 pin 5 is 3.8V
(forward), U1 pin 4 is 0V (reflected).

Thanks
Jay

On Sun, Jun 7, 2009 at 9:17 PM, Jay Sissom<[hidden email]> wrote:

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Don Wilhelm-4

Re: K2 KAT2 pad B problem

In reply to this post by Jay S

Jay,

Read the instruction again. You do *not* measure the voltage at pad "B"
- that is only a reference point to help you find U4 pin 1. It is the
voltage at U4 pin 1 that is to be measured.

73,
Don W3FPR

Jay Sissom wrote:

> Hello, I'm having a problem with my KAT2. I have built the board and
> I'm on page 17 of the manual where you measure the voltage at pin B.
> I always get 0 volts here. Here are some other observations:
>
> I have the ATU menu set to CALn, Power set to 5.0, frequency set to 7.100Mhz.
>
> After pressing tune:
> pin B = 0V
> U4 pin 5 = 3.8V
> U4 pin 4 = 0V
> C55 setting 009
>
> With an external wattmeter between the dummy load and Ant 1, it reads 6.5W.
>
> Any ideas where to look for the problem?
>
> Thanks & 73
> Jay
> W9IUF
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.339 / Virus Database: 270.12.55/2160 - Release Date: 06/07/09 05:53:00
>
>

Jay S

Re: K2 KAT2 pad B problem

I have been stuck on that step for such a long time. Once I read it
wrong, every time I got the KAT2 out and thought I'd fix it, I read it
the same way. I have resoldered all the parts in the SWR reading
circuit multiple times and replaced T1 at least twice.

If I had just read properly, I would have known that the board is
fine. My complete K2 is now assembled and working! It has been
working fine without the antenna tuner, but now it is complete.

Thanks again for your help with this.

73
Jay
W9IUF

On Sun, Jun 7, 2009 at 10:16 PM, Don Wilhelm<[hidden email]> wrote:

> Jay,
>
> Read the instruction again. You do *not* measure the voltage at pad "B" -
> that is only a reference point to help you find U4 pin 1. It is the voltage
> at U4 pin 1 that is to be measured.
>
> 73,
> Don W3FPR
>
> Jay Sissom wrote:
>>
>> Hello, I'm having a problem with my KAT2. I have built the board and
>> I'm on page 17 of the manual where you measure the voltage at pin B.
>> I always get 0 volts here. Here are some other observations:
>>
>> I have the ATU menu set to CALn, Power set to 5.0, frequency set to
>> 7.100Mhz.
>>
>> After pressing tune:
>> pin B = 0V
>> U4 pin 5 = 3.8V
>> U4 pin 4 = 0V
>> C55 setting 009
>>
>> With an external wattmeter between the dummy load and Ant 1, it reads
>> 6.5W.
>>
>> Any ideas where to look for the problem?
>>
>> Thanks & 73
>> Jay
>> W9IUF
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> ------------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database:
>> 270.12.55/2160 - Release Date: 06/07/09 05:53:00
>>
>>
>