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CW filter question

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JEAN-FRANCOIS MENARD-3

CW filter question

Hi,

I am doing a complete aligment of my K2 during the weekend... just
for the fun of learning.... and in the KSB2 SSB manual, they said to
set OP1 for FL1 (filter on SSB board) for both SSB and CW. I
undertstand what is OP1, etc...

But my question is: Could I choose other than OP1 for the first CW
filter ?

My setup for CW only is FL1 = 1.5 kHz and FL2 = 500 Hz... both are
well aligned on 600 Hz peak with a spectrum analyzer. I don't want a
wide filter for CW.. like OP1. I understand that basic K2 crystal are
optimized for 700 Hz and below signal filter. And if I was using only
CW without the SSB board, I will be using the basic K2 filter only
anyway... so I think I am OK, but I only want to make sure that
including a SSB board do not change my understanding of how filter
works in the K2.

Thanks and 73

=============================================
JEAN-FRANÇOIS MÉNARD / VA2VYZ

ELECRAFT KX1 #999, K2 #4130
FISTS #11896

Pour visitez mon site Internet / To visit my website :

http://homepage.mac.com/jfmenard
=============================================

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Don Wilhelm-3

RE: CW filter question

Jean-Francois,

If I recall, that statement in the SSB manual does not say you must (or
should) set the wide CW filter to OP1, it only says that one CAN do that -
so if it is not desirable for you (it is not for me either), then leave your
CW filter widths as they are as they are. Adding the SSB option does not
change CW in the K2 but it does increase the filter choices by adding the
OP1 fixed bandwidth filter.

If you want more detail on K2 alignment than is in the manual, in particular
the Dial Calibration and setting the filters, you may want to look at my
website http://w3fpr.qrpradio.com or the mirrors at www.qsl.net/w3fpr or
http://home.earthlink.net/~w3fpr - Spectrogram is adequate, but if you have
access to a full blown spectrum analyzer, you can use that instead.

73,
Don W3FPR

> -----Original Message-----
>
> I am doing a complete aligment of my K2 during the weekend... just
> for the fun of learning.... and in the KSB2 SSB manual, they said to
> set OP1 for FL1 (filter on SSB board) for both SSB and CW. I
> undertstand what is OP1, etc...
>
> But my question is: Could I choose other than OP1 for the first CW
> filter ?
>
> My setup for CW only is FL1 = 1.5 kHz and FL2 = 500 Hz... both are
> well aligned on 600 Hz peak with a spectrum analyzer. I don't want a
> wide filter for CW.. like OP1. I understand that basic K2 crystal are
> optimized for 700 Hz and below signal filter. And if I was using only
> CW without the SSB board, I will be using the basic K2 filter only
> anyway... so I think I am OK, but I only want to make sure that
> including a SSB board do not change my understanding of how filter
> works in the K2.
>
> Thanks and 73
>
> =============================================
> JEAN-FRANÇOIS MÉNARD / VA2VYZ
>
> ELECRAFT KX1 #999, K2 #4130
> FISTS #11896
>
> Pour visitez mon site Internet / To visit my website :
>
> http://homepage.mac.com/jfmenard
> =============================================
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>
> --
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> Checked by AVG Free Edition.
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>
>

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Dan Barker

RE: CW filter question

Using OP1 for CW in FL1 position DOES use the SSB adapter for transmit,
IIRC. If you want the wide "listening" filter, set FL2 to OP1, and transmit
through the CW filter. Of course I may be wrong<g>.

Dan / WG4S / K2 #2456.

Jean-Francois,

If I recall, that statement in the SSB manual does not say you must (or
should) set the wide CW filter to OP1, it only says that one CAN do that -

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Bill Coleman-2

Re: CW filter question

On Dec 29, 2005, at 11:44 AM, Dan Barker wrote:

> Using OP1 for CW in FL1 position DOES use the SSB adapter for
> transmit,
> IIRC. If you want the wide "listening" filter, set FL2 to OP1, and
> transmit
> through the CW filter. Of course I may be wrong<g>.

I use an unusual setup for CW myself. While still centered on 600 Hz,
my filter settings are:
1000
400
160
OP1

I chose 1000 because that's the largest size of the variable filter
where it still has one peak with smooth sides. Larger than that, the
filter starts to get a second "hump" on one side.

1000 is kinda narrow for quickly scanning the band. But it is a good
width for most conditions. 400 is good for congested contest
conditions. I rarely use 160.

OP1 works well on an empty band, when you are searching for activity,
like on 10m these days. But, it is hard to zero-beat stations with
this filter.

Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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JEAN-FRANCOIS MENARD-3

Re: CW filter question

In reply to this post by Don Wilhelm-3

Thanks Don, Dan and Bill.

I'm shutting off my K2 for a little «inside work» !!! ;-)

Best 73 and Happy New Year !!!

Le 05-12-29 à 11:16, Don Wilhelm a écrit :

> Jean-Francois,
>
> If I recall, that statement in the SSB manual does not say you must
> (or
> should) set the wide CW filter to OP1, it only says that one CAN do
> that -
> so if it is not desirable for you (it is not for me either), then
> leave your
> CW filter widths as they are as they are. Adding the SSB option
> does not
> change CW in the K2 but it does increase the filter choices by
> adding the
> OP1 fixed bandwidth filter.
>
> If you want more detail on K2 alignment than is in the manual, in
> particular
> the Dial Calibration and setting the filters, you may want to look
> at my
> website http://w3fpr.qrpradio.com or the mirrors at www.qsl.net/
> w3fpr or
> http://home.earthlink.net/~w3fpr - Spectrogram is adequate, but if
> you have
> access to a full blown spectrum analyzer, you can use that instead.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>> I am doing a complete aligment of my K2 during the weekend... just
>> for the fun of learning.... and in the KSB2 SSB manual, they said to
>> set OP1 for FL1 (filter on SSB board) for both SSB and CW. I
>> undertstand what is OP1, etc...
>>
>> But my question is: Could I choose other than OP1 for the first CW
>> filter ?
>>
>> My setup for CW only is FL1 = 1.5 kHz and FL2 = 500 Hz... both are
>> well aligned on 600 Hz peak with a spectrum analyzer. I don't want a
>> wide filter for CW.. like OP1. I understand that basic K2 crystal are
>> optimized for 700 Hz and below signal filter. And if I was using only
>> CW without the SSB board, I will be using the basic K2 filter only
>> anyway... so I think I am OK, but I only want to make sure that
>> including a SSB board do not change my understanding of how filter
>> works in the K2.
>>
>> Thanks and 73
>>
>> =============================================
>> JEAN-FRANÇOIS MÉNARD / VA2VYZ
>>
>> ELECRAFT KX1 #999, K2 #4130
>> FISTS #11896
>>
>> Pour visitez mon site Internet / To visit my website :
>>
>> http://homepage.mac.com/jfmenard
>> =============================================
>>
>>
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.1.371 / Virus Database: 267.14.9/216 - Release Date:
>> 12/29/2005
>>
>>
>

Don Wilhelm-3

RE: CW filter question

In reply to this post by Dan Barker

Dan,

The SSB adapter itself is not used for transmitting CW in any case, although
the BFO signal does pass through the SSB option in all cases. The signal
enters the KSB2 and flows through C42 and then through D3 (which is forward
biased by the TXC signal) then through Q1 and back to the RF board through
C39 - this path is the same no matter which filter is selected.

The BFO frequency will be determined by the filter that is used for FL1, but
the K2 keeps an orderly account of the various BFOs and filters so the
microprocessor knows how to preserve the proper signal pitch as the filters
are changed (within 20 Hz or so). Bottom line is that as long as the signal
being copied is set to zero beat, the transmit frequency will be correct.

73,
Don W3FPR

> -----Original Message-----
>
> Using OP1 for CW in FL1 position DOES use the SSB adapter for transmit,
> IIRC. If you want the wide "listening" filter, set FL2 to OP1,
> and transmit
> through the CW filter. Of course I may be wrong<g>.
>
> Dan / WG4S / K2 #2456.
>
>