K3 2-tone IMD test.
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Today we finished our K3 IMD-test in our home-laboratory. :)
We has the nice results I think. Same improvements we have after modifications in hardware (mods for 1st and 2nd Mixer, IF-buffer and AF-amplifier). Same improvements we have after excellent software "AGC-mods" from Lyle Johnson. And here is the nice result in total. 2-tone-IMD-Plot for K3/100F BEFORE mods: http://forum.cqham.ru/download.php?id=48688 here we can see very dirty and nonlinear signal Plot for K3/100F AFTER hardware mods: http://forum.cqham.ru/download.php?id=48689 more clean and linear signal Plot for K3/100F AFTER hardware mods AND new AGC: http://forum.cqham.ru/download.php?id=48677 and nice result in total. GL! 73! Alex UR5LAM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Alex,
Can you please be specific about which HW mods you installed? Are they all published by Elecraft? I don't recall any 1st and 2nd Mixer mods being published. If not, can you please share them? Are the software mods in the current beta FW, i.e. 3.30? Thanks. Chuck, AE4CW
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Chuck, AE4CW |
Re: K3 2-tone IMD test.
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Chuck,
the most significant modification - the IF-amplifier buffer and AF-amplifier circuit. The first mod helps to provide much smaller own noise level for K3 (10dB down !!!), and second mod takes more realistic sound. We talks about it earlier in the thread: http://mailman.qth.net/pipermail/elecraft/2009-June/111985.html The mods for 1-st and 2-nd mixer can be helpful only for multi-TX high-power contest station. In any event, all pictures of these mods here: http://ur5lam.jimdo.com/elecraft-k3-mod-s-page/ if you want to see the big photos, you find and download it here: http://forum.cqham.ru/viewtopic.php?t=17137&postdays=0&postorder=asc&&start=870 http://forum.cqham.ru/viewtopic.php?t=17137&postdays=0&postorder=asc&&start=900 All of these mods are not difficult. But results is very nice. My K3 has much poor sound in A/B comparison with my small K2. But now, I have the new Radio, really excellent receiver and beautiful sound after mods. I can hear the difference by my ear, I can see the difference by my eyes on the comparison plots. FW last beta 3.30 73! GL! Alex UR5LAM 2009/9/27 Chuck - AE4CW <[hidden email]> > > Alex, > > Can you please be specific about which HW mods you installed? Are they all > published by Elecraft? I don't recall any 1st and 2nd Mixer mods being > published. If not, can you please share them? > > Are the software mods in the current beta FW, i.e. 3.30? > > Thanks. > > Chuck, AE4CW > > > > Alexander Ponomarenko-5 wrote: > > > > Today we finished our K3 IMD-test in our home-laboratory. :) > > We has the nice results I think. > > Same improvements we have after modifications in hardware (mods for 1st > > and 2nd Mixer, IF-buffer and AF-amplifier). > > Same improvements we have after excellent software "AGC-mods" from Lyle > > Johnson. > > And here is the nice result in total. > > > > 2-tone-IMD-Plot for K3/100F BEFORE mods: > > http://forum.cqham.ru/download.php?id=48688 > > here we can see very dirty and nonlinear signal > > > > Plot for K3/100F AFTER hardware mods: > > http://forum.cqham.ru/download.php?id=48689 > > more clean and linear signal > > > > Plot for K3/100F AFTER hardware mods AND new AGC: > > http://forum.cqham.ru/download.php?id=48677 > > and nice result in total. > > > > GL! 73! > > Alex UR5LAM > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Alex, Thank you! I am studying your mods
and will report back if I decide to do them. Chuck, AE4CW From: Alexander
Ponomarenko-5 (via Nabble) [mailto:[hidden email]] Chuck,
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Chuck, AE4CW |
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