KPA500 LPF T/R switch rework

[Don Field]

I wonder whether anyone on here can answer the following query from my
friend Mike G3WPH please (he's not on this reflector but I'll QSP any
replies):

*I’m installing Elecraft parts kit E850607 into a KPA500 for a friend. All
went well until I reached instruction 3 which says ‘Verify that R3 is a
Zener Diode Elecraft part E560074. If it is not remove and replace with the
provided diode’ Unfortunately the instructions have no information about
the zener orientation and I don’t have a circuit diagram.  I’ve verified R3
is a 100k resistor.*



*I’m guessing that others have already come across this problem and can
help. I can’t find any information on the web and not being a Elecraft user
don’t have access to any of their mailing lists.*



*Thanks for any help,*

*Mike /G3WPH*


73 Don G3XTT
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[Ken Arck]

Hi all

Anyone have the non-tuner antenna interface card they'd like to part with?

Ken
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[Don Field]

My thanks to those who respondedm especially Tom K1TL - we now have the
info we need - great service!

73 Don G3XTT

On 10 June 2016 at 17:16, Don Field <[hidden email]> wrote:

> I wonder whether anyone on here can answer the following query from my
> friend Mike G3WPH please (he's not on this reflector but I'll QSP any
> replies):
>
> *I’m installing Elecraft parts kit E850607 into a KPA500 for a friend. All
> went well until I reached instruction 3 which says ‘Verify that R3 is a
> Zener Diode Elecraft part E560074. If it is not remove and replace with the
> provided diode’ Unfortunately the instructions have no information about
> the zener orientation and I don’t have a circuit diagram.  I’ve verified R3
> is a 100k resistor.*
>
>
>
> *I’m guessing that others have already come across this problem and can
> help. I can’t find any information on the web and not being a Elecraft user
> don’t have access to any of their mailing lists.*
>
>
>
> *Thanks for any help,*
>
> *Mike /G3WPH*
>
>
> 73 Don G3XTT
>

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