K2 OPT command

[Don Palmer]

Hi hope someone can help me I have just finishing building a K2 when I
change OPT to Optimization I lose sound.

I put it back to BATT and it all comes back, I understand that this command
reduces the I.F.

post-mixer amplifier current by about 40 mA and automatically

forces the bargraph to use DOT mode if set for BAR.

 

Any help would be grateful.

 

Don

G6CMV

K2 Ser Num 6546

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[vk2rq]

Maybe check R84 and particularly R85 are the  correct values, and doesn't have any dry joints? I'm guessing that Q12 takes R84 in/out of circuit in order to set bias current on Q22, and if Q12 is open circuit to set optimised bias current, and there is a problem with R85, the post mixer amplifier won't work properly?

73,
Matt VK2RQ

> On 25 Feb 2015, at 12:35 am, Don Palmer <[hidden email]> wrote:
>
> Hi hope someone can help me I have just finishing building a K2 when I
> change OPT to Optimization I lose sound.
>
> I put it back to BATT and it all comes back, I understand that this command
> reduces the I.F.
>
> post-mixer amplifier current by about 40 mA and automatically
>
> forces the bargraph to use DOT mode if set for BAR.
>
>
>
> Any help would be grateful.
>
>
>
> Don
>
> G6CMV
>
> K2 Ser Num 6546
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

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