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 <[email protected]> To: [email protected] Cc: Elecraft Reflector <[email protected]> Subject: [Elecraft] KX3 schematics Message-ID: <[email protected]> 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
