[Elecraft] K2 No SSB output power with new SSB board fitted.

[Dave Van Wallaghen]

Mark,

I am guessing that bias voltage is being supplied from another route or 
that MH4 would not work. Some ops place the resistor on the mic 
configuration header as opposed to the mic connector itself. That may 
explain why it is working in the other rig.

Either way, sounds like you have things working. Enjoy!

73,
Dave, W8FGU


On 11/29/2021 10:16:54 AM, "M Bak" <mark.adrian.baker at gmail.com> wrote:

>Hi
>
>Thanks for the heads up.
>
>Yes. I fitted a 5K6 resister about 3 mins ago and it works. What is 
>curious is the other rig also has no resistor but just works, with both 
>microphones. That is the one with the trimmers in the wrong place but 
>again works. If I am stranded on a desert Island I know which rig I 
>want, the one that seems to just like working.
>
>73,
>
>Mark G4RUR
>
>
>
>On Mon, 29 Nov 2021 at 15:12, Dave Van Wallaghen <dave at w8fgu.com> 
>wrote:
>>Mike,
>>
>>That mic requires bias. Did you place a 5.6K resistor between pin 1 
>>and
>>6 on the mic connector?
>>
>>73,
>>Dave W8FGU
>>
>>------ Original Message ------
>>From: "M Bak" <mark.adrian.baker at gmail.com>
>>To: elecraft at mailman.qth.net
>>Sent: 11/29/2021 9:05:43 AM
>>Subject: [Elecraft] K2 No SSB output power with new SSB board fitted.
>>
>> >Everything setup to the point of ‘Fine carrier Balance Adjustment. 
>>But no
>> >RF output. The SSBA BAL adjustment worked fine so there must be a low 
>>level
>> >SSB signal to be fed back to the Rx. Current jumps from 222mA to 
>>398mA on
>> >activating PTT. No increase with audio input, no S meter indication 
>>or
>> >indication in wattmeter.
>> >
>> >
>> >
>> >New SSB board swapped out with known working one from another rig. 
>>The
>> >newly built board works fine in the other rig. Known good board does 
>>not
>> >work in newly built rig. Stating the obvious the SSB boards are fine 
>>there
>> >is something up with the new rig. CW works ok with full output power.
>> >
>> >
>> >
>> >
>> >
>> >Mike is Elecraft MH4.
>> >
>> >Continuity of AF pin1 confirmed up to pin5 of J11.
>> >
>> >W2 and W3 removed, also C167.
>> >
>> >--
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>
>
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>Das Beste Oder Nichts