Dear Wayne,
thank you for posting the note about the availability of KX3 schematic diagrams. I was waiting for these since a long time, I was very courious to see the mixers selected, there is always something to learn.
I would like to compliment the design team for the KX3 RX mixer. I thought they were going to use a "classic" QSD using the FST3253, like in the Flex-1500 or the Softrock, or similar to the one used in the TX mixer.
I like the RX mixer using the FST3257/74CBT3257, this one should have a lower noise, going up in frequency, than a similar one using the FST3253. This latter device has an internal clock decoding and the balanced LO waveform cannot directly control the switches gates, i.e. a 50-50 clock may result in a 49-51 signal switching, or vice a versa, while with the FST3257 the gates are directly controlled by the clock waveform.
I garantee you I will not try to modify this mixer .. although I could have a different solution ... hi
Congratulations again for a nice product
Best 73
Gian
I7SWX
Message: 38
Date: Tue, 5 Mar 2013 17:16:01 -0800
From: Wayne Burdick <
[hidden email]>
To:
[hidden email]
Cc: Elecraft Reflector <
[hidden email]>
Subject: [Elecraft] KX3 schematics
Message-ID: <
[hidden email]>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
The full KX3 schematic package is now available on our Manual Download
page.
73,
Wayne
N6KR
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