KRX3

[W8JI]

I just finished putting together a K3, I've looked at the
manuals, and I have a question.

I have identical filters in the main and second receivers.
Stock filters plus FL2  2.1kHz and FL3  400Hz.

How do I know the roofing filters in the KRX3 are being
selected? Are they automatically selected when the roofing
filter in the main receiver is picked?

I couldn't find any menu that lets me program the filters in
the KRX3, so I assume when the main is on the sub is on?? If
it is in the manual, where is it??

Is there a way to change the tuning speed of the clarifier
without affecting the main dial?

I found everything else, but never did find an answer to
these questions.

Thanks, Tom

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[Ed Muns, W0YK]

> I just finished putting together a K3, I've looked at the
> manuals, and I have a question.
>
> I have identical filters in the main and second receivers.
> Stock filters plus FL2  2.1kHz and FL3  400Hz.
>
> How do I know the roofing filters in the KRX3 are being
> selected? Are they automatically selected when the roofing
> filter in the main receiver is picked?
>
> I couldn't find any menu that lets me program the filters in
> the KRX3, so I assume when the main is on the sub is on?? If
> it is in the manual, where is it??
>
> Is there a way to change the tuning speed of the clarifier
> without affecting the main dial?
>
> I found everything else, but never did find an answer to
> these questions.

The KRX3 manual explains how to set parameters on the second receiver,
including filter settings.  The manual is available on the Elecraft web
site.  The quick answer is to use the BSET hold function on the front panel
to configure settings in the second receiver and SUB to enable the
sub-receiver.

73,
Ed - W0YK

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[Jim Brown-10]

Hi Tom,

I don't have a KRX3 yet (it's backordered), but I've been using a
K3 for a while. If you've gone into setup for each filter, told
the software what bandwidth filter is in each filter position, and
turned each filter on, as you slowly turn bandwidth control you
should hear an audibly greater change in the character of the band
noise when the roofer kicks in or out.

The roofer switches in at whatever frequency you tell the
software. You can tell it, for example, that the 400 Hz filter is
a 500 Hz filter, and it will kick in at 500 Hz.

BTW -- several of us with the capability to measure the filters
have found that the 8-pole filters DO have enough slop in their
center frequency that you MAY need to shift their centering at
bit. My 400 Hz filter is about 45 Hz off, so it was a tossup
between 40 and 50 Hz.

73,

Jim K9YC

On Wed, 6 Aug 2008 00:14:24 -0400, Tom W8JI wrote:

>How do I know the roofing filters in the KRX3 are being
>selected? Are they automatically selected when the roofing
>filter in the main receiver is picked?




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[W8JI]

> The KRX3 manual explains how to set parameters on the
> second receiver,
> including filter settings.  The manual is available on the
> Elecraft web
> site.  The quick answer is to use the BSET hold function
> on the front panel
> to configure settings in the second receiver and SUB to
> enable the
> sub-receiver.

Thanks, that was my oversight too. I also expected it to be
in the KRX3 manual but it is actually in the main operating
manual. There is a sentence or two in the KRX3 manual that
steers the user to the main operation manual on the proper
page!!  They put it in there (to go to the operating manual)
but somehow I kept ignoring it.

Just a correction. I was trying to use the BSET hold
function because intuitively that is what I thought. So the
problem is we do NOT use the Bset.
The user really just goes to the normal main filter menu
setup and taps"sub" when setting the filter!!!

Everything is setup fine now and working great to the extent
I have tested things. Over the next few weeks I'll do things
like measure distortion and such.


Question....
I may be missing this too but I still have no idea if I can
change the tuning rate of the clarifier knob. I've looked
around for it but can't seem to find anything.

73 Tom

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[Dave, G4AON]

Welcome to the Elecraft Reflector Tom!

When RIT & XIT are both turned off, the RIT control gives fast tuning
provided it is configured in the menu (VFO OFS = ON, set tuning rate
with VFO CRS). This latter setting is set per mode and can offer 5 KHz
tuning steps on SSB.

73 Dave, G4AON
K3/100 #80
-------------------

Question....
I may be missing this too but I still have no idea if I can
change the tuning rate of the clarifier knob. I've looked
around for it but can't seem to find anything.

73 Tom
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[Ed Muns, W0YK]

> Question....
> I may be missing this too but I still have no idea if I can
> change the tuning rate of the clarifier knob. I've looked
> around for it but can't seem to find anything.

If by "clarifier", you mean the RIT/XIT knob, its tuning rate is the same as
the VFO tuning rate (FINE or COARSE).  The RIT/XIT tuning rate is not set
independently.

73,
Ed - W0YK

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