Hi Lance,
The new RF board (revision F4) was phased into production around May of 2017.
Here are the benefits:
- slower temperature gradient and less T/R offset effect (both due to moving
the Si570 away from the TX stages)
- improved rejection of out of band QRM on 17/15/12/10 meters (new band-pass
filters)
However, I can't say for certain that this is adequate for use with Q65 mode.
In at least two cases that I know of, KX3 owners upgraded from the earlier RF
board specifically to take advantage of the improved frequency stability. As
you can imagine, this is not an inexpensive proposition. But if you're
interested, feel free to contact sales.
73,
Wayne
N6KR
> On Jan 30, 2022, at 8:00 PM, Lance Collister, W7GJ
> wrote:
>
> Does anyone know at what Serial Number Elecraft upgraded the KX3 RF board to
> one with greater frequency stability? I am interested in finding one that is
> stable enough to use on 6m EME with Q65-60A mode. Thanks for any information!
>
> VY 73, Lance
>
> --
> Lance Collister, W7GJ(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX,
> 3D2LR, 5W0GJ, E6M, TX5K, KH8/W7GJ, V6M, T8GJ, VK9CGJ, VK9XGJ, C21GJ, CP1GJ,
> S79GJ, TX7MB)
> P.O. Box 73
> Frenchtown, MT 59834-0073
> USA
> TEL: (406) 626-5728
> QTH: DN27ub
> URL: http://www.bigskyspaces.com/w7gj
> Skype: lanceW7GJ
> 2m DXCC #11 - 6m DXCC #815 - FFMA #7
>
> Interested in 6m EME? Ask me about subscribing to the new Magic Band EME
> email group, or just fill in the request box at the bottom of my web
> page (above)!
>
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