Re: New K3 Firmware: Pileup-inspired AGC changes

[Gary Hvizdak]

Wed Feb 25 13:45:20 EST 2009 wayne burdick n6kr wrote ...

... We have a new field-test firmware revision available that offers a
significant improvement in such situations by reducing the IMD caused by
conventional AGC.

--

Wayne,

    I just received #2724 yesterday and am still inventorying the parts, and
you've already improved mine and all existing and future K3s?  And all that's
necessary is to download and install new firmware?  And there's no additional
cost to the user?

    :>)

73,
Gary  KI4GGX

P.S.  Does this new firmware eliminate the need for really narrow roofing
filters?  Does it make them even more useful?  Does it not have any bearing?
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[Jim Brown-10]

On Wed, 25 Feb 2009 14:39:16 -0500, [hidden email] wrote:

> Does this new firmware eliminate the need for really narrow roofing
>filters?  Does it make them even more useful?  Does it not have any
>bearing?

The benefit of all of this software tweaking and the roofing filters and
the operator working hard to learn the radio and radios in general are
all additive!

Someone just posted that they had trouble in pileups during the contest
last weekend, but the radio worked better when they turned on the
attenuator and turned down the RF gain. DUH!  I learned that in 1957 --
but younger operators never learned it, since modern radios depend so
heavily on AGC.

73,

Jim K9YC



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[wayne burdick]

>> Does this new firmware eliminate the need for really narrow roofing
>> filters?

It has nothing to do with roofing filters. The roofing filters are
critical to the K3's design; they keep large signals from getting into
the I.F. strip in the first place.

The AGC changes we're testing are intended to reduce the modulation
effects that DSP AGC creates when multiple, closely spaced signals are
present within the DSP's passband. Early reports suggest that it's
working.

73,
Wayne
N6KR

---

http://www.elecraft.com

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