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KX3 filter question

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Mike Smith VE9AA

KX3 filter question

So, I just (today) bought a used KX3. I've owned gobs of Icoms and Yaesu's,
so the Elecraft controls are pretty foreign to me.

I do own a K3 but have quite literally used it 3 times in the 6 or whatever
years I've owned it. It's packed away.

I've looked in the 2 books I've rec'd but it doesn't spell it out "exactly"
and maybe I am just being daft. I';m off work today, under the weather, so
not firing on all cylinders.(hi)

I am wondering about the various filter widths and how to adjust. It almost
seems like it goes to FIL 1, 2 3 automatically as I adjust the PB tuning,.

IS THIS THE WAY FILTERS WORK?

In my Icoms (hope that's not a dirty word here), I have to purposely select
individual filters with a button press or two or three as it cycles through
them.

It's been so long since I used my K3 (3-4 yrs?) that I don't even recall how
it's done, but my sense was that it was different on the K3.

Thanks for answering this obviously very basic question. I don't have a
good way to set up and operate in the tiny shack, but I may try to put it on
a wire in the livingroom later this month and familiarize myself with some
settings on these Elecrafts. Posted below was the sale ad I bought it from.

73 Mike VE9AA

KX3 for sale serial number 1900 from a non-smoking and no pet home. The
Latest firmware installed.
The package includes the following:
KXAT3 Antenna tuner
KXFL3 Filters
KXBC3 Battery charger
KXUSB PC interface cable
KX3VFO MDKT ball bearing VFO upgrade. I still have the original VFO as well.
Side KX panels from GEM along with the plastic face cover. I also will
include the original panels.
Top mounted black finned heat sink.
Mini Palm paddle
Nifty manual.
Original owners manual.
Fred Caddy manual.
2 Tracer 8Ah 12 volt lithium polymer battery packs, wall charger and with
paralleling cable for 16Ah.

Mike, Coreen & Corey

Keswick Ridge, NB

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Grant Youngman-2

Re: KX3 filter question

The introduction the KXFL3 manual described these filters.

(https://ftp.elecraft.com/KX3/Manuals%20Downloads/E740165%20Elecraft%20KXFL3%20Option%20Rev%20A3.pdf)

They are not IF filters in the sense you may be used to. In the KX3, selective filtering is done in the DSP. These are roofing filters, at baseband, that sit in front of the DSP, and serve to improve the dynamic range of the radio. They switch in automatically, and there’s no way to select them specifically (and no reason to). But the display does show you what roofing filter is active.

Grant NQ5T

> On Dec 8, 2020, at 3:48 PM, Mike Smith VE9AA <[hidden email]> wrote:
>
>
>
> I am wondering about the various filter widths and how to adjust. It almost
> seems like it goes to FIL 1, 2 3 automatically as I adjust the PB tuning,.
>
>
>
> IS THIS THE WAY FILTERS WORK?
>
>
>
> I

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Mike Smith VE9AA

Re: KX3 filter question

Thanks Grant and K9ZTV for the confirmation that I sorta figured it out. (hi)

Mike

Mike, Coreen & Corey
Keswick Ridge, NB

-----Original Message-----
From: Grant Youngman [mailto:[hidden email]]
Sent: December 8, 2020 5:04 PM
To: Mike Smith VE9AA
Cc: Elecraft Refl
Subject: Re: [Elecraft] KX3 filter question

The introduction the KXFL3 manual described these filters.

(https://ftp.elecraft.com/KX3/Manuals%20Downloads/E740165%20Elecraft%20KXFL3%20Option%20Rev%20A3.pdf)

They are not IF filters in the sense you may be used to. In the KX3, selective filtering is done in the DSP. These are roofing filters, at baseband, that sit in front of the DSP, and serve to improve the dynamic range of the radio. They switch in automatically, and there’s no way to select them specifically (and no reason to). But the display does show you what roofing filter is active.

Grant NQ5T