K3 TX IMD

[charliedelta]

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I was intrigued by Johns KI6WX comments on the K3's transmitter
design.

Quote
The K3 is designed to not only receive signals in a noisy RF
environment, but also to generate a much cleaner signal in transmit

How good is the  transmitter  IMD performance? I was also wondering
if the issue of TX ALC induced IMD was addressed? A  problem thats
so common in many Japanese radios. Would the K3 meet the NTIA
Redbook Standard?

I was also wondering what final PA transistors or FET's  are used
in the K3?


Craig
VK3HE
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[John, KI6WX]

Craig;
I can't comment specifically on the TX IMD performance since I wasn't
involved with that part of the design.  The comments I made referred to
excessive broadband amplitude and phase noise that some transmitters
generate that can cover 100's of kHz of bandwidth.  If you live near such a
transmitter running a kW of power, you can hear the transmissions across
much of an amateur band.  We do understand that problem and worked to
minimize it as much as we reasonably could.
-John
 KI6WX

> I was intrigued by Johns KI6WX comments on the K3's transmitter
> design.
>
> Quote
> The K3 is designed to not only receive signals in a noisy RF
> environment, but also to generate a much cleaner signal in transmit
>
> How good is the  transmitter  IMD performance? I was also wondering
> if the issue of TX ALC induced IMD was addressed? A  problem thats
> so common in many Japanese radios. Would the K3 meet the NTIA
> Redbook Standard?
>
> I was also wondering what final PA transistors or FET's  are used
> in the K3?
>
>
> Craig
> VK3HE

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