K3 Transmiter IMD figures

[Keith Bainbridge-2]

A friend has commented that in the ARRL test the IMD figures for the tx
chain of -27dB were pretty poor. I'm sure there was discussion about
this at the time the report was released but a search of the archives
hasn't revealed it to me.
Can anyone point me in the right direction so I can explain the results
to him.
Many thanks
73
Keith
--
Keith
VK6XH / VK6DXR
Chairman WIA VK6 Advisory Committee.
Northern Corridor Radio Group Inc VK6ANC
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[Julian, G4ILO]

Keith Bainbridge-2 wrote

A friend has commented that in the ARRL test the IMD figures for the tx
chain of -27dB were pretty poor. I'm sure there was discussion about
this at the time the report was released but a search of the archives
hasn't revealed it to me.
Can anyone point me in the right direction so I can explain the results
to him.

I think the reference you are looking for is this: http://www.mail-archive.com/[e-mail]/msg50667.html .

Subsequently I believe it was found that in the version of firmware used, the speech compressor was not being bypassed when the control was turned to 0. This added sufficient extra distortion to cause the -27dB figure that was quoted rather than the -30dB that Elecraft expected.

[Ken Wagner K3IU]

G'morning(here), Keith:

You can look at an email from Wayne on this subject here.

http://n2.nabble.com/re%3A--ARRL-K3-review-for-Apr-QST-posted--TX-IMD--td462836.html#a462836

73, Ken K3IU


Keith Bainbridge wrote:
> A friend has commented that in the ARRL test the IMD figures for the
> tx chain of -27dB were pretty poor. I'm sure there was discussion
> about this at the time the report was released but a search of the
> archives hasn't revealed it to me.
> Can anyone point me in the right direction so I can explain the
> results to him.
> Many thanks
> 73
> Keith
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