Re: [Elecraft] 1 Khz filter

[Jim Brown]

On 7/26/2017 9:09 AM, Bill Breeden wrote:
I have used my "Field Day" K3 to call CQ during crowd banded 
conditions before and after I added the 1 kHz filter and have found 
the improvement well worth the price of the filter.  Your mileage may 
vary. 


While this is certainly a matter of operating preferences, my preference 
is not to bother with callers more than a few hundred Hz off frequency 
for at least three reasons. First, I've tried to protect my CQ frequency 
by keeping it active. If I work someone widely displaced, my frequency 
is unprotected while they're transmitting. Second, if they're that far 
off frequency, they're likely to be getting QRMed by a station on their 
frequency, which makes them hard to copy. Third, if they're that far off 
frequency, they're more likely to be lids, and thus more likely to take 
forever to finish a QSO.


For the same reasons, I won't respond to someone signing /QRP. Not 
because I don't want to take the time to work a weak station, but 
because that station signing /QRP is likely to be a lid. Indeed, by 
sending /QRP he/she is wasting time doing so by sending un-necessary 
information. I work a LOT of QRP, especially during DX contests, with 
more than 160 countries confirmed, but I've never signed /QRP.


73, Jim K9YC

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Re: [Elecraft] 1 Khz filter

[Bill Breeden]

Jim,

I think most K3 owners understand that.  Those who call CQ during 
crowded band conditions also understand that their ears will take less 
of a beating when using a 1 kHz DSP bandwidth in conjunction with a 1 
kHz roofing filter instead of the next wider roofing filter, which, in a 
K3 is often a 2.7 or 2.8 kHz filter.  That's the wonderful thing about a 
K3, the owner can equip it according to his or her personal preference.  
My ears have taking enough beatings over the years from stations outside 
of the filter bandwidth pumping the AGC while using lesser receivers to 
know that I prefer a tight roofing filter bandwidth so that the stations 
outside of my DSP bandwidth have minimal effect on what I am hearing.   
I have used my "Field Day" K3 to call CQ during crowd banded conditions 
before and after I added the 1 kHz filter and have found the improvement 
well worth the price of the filter.  Your mileage may vary.


73,

Bill - NA5DX

On 7/25/2017 10:08 PM, Jim Brown wrote:

On 7/25/2017 7:11 PM, Bill Breeden wrote:
I found that I was missing stations that were calling on the skirts 
of my 400 Hz filter, so I added a 1 kHz filter.  When I tune the band 
to answer CQs I still prefer listen through the 400 Hz filter. 


It's important to remember that IF bandwidth is determined by DSP, and 
continuously adjustable. The plug-in filters are ROOFING filters -- 
their primary function is to protect the DSP from overload by very 
strong stations outside the bandwidth of the DSP IF. They have the 
secondary function of adding the filtering provided by the DSP, and 
when the DSP and the roofing filter are at the same bandwidth, the 
filter skirts become steeper (sharper).


Bottom line -- we don't need to buy a 1 kHz filter to get 1 kHz IF 
bandwidth, because the DSP already provides that. This is not your 
grandfather's radio! :)


73, Jim K9YC

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Re: [Elecraft] 1 Khz filter

[Victor Rosenthal 4X6GP]

I am a CW operator and I have 2.8kHz, 1kHz, 400Hz and 200Hz filters in 
my K3. I think this is serious overkill (especially since I have another 
similar set in the subreceiver).


The function of the crystal filters is to allow you to operate closer 
than (roughly) the filter bandwidth to a signal that is S9+20 dB or more 
without the interfering signal having any effect on the desired signal. 
The continuously adjustable DSP filter is a brick wall for undesired 
signals weaker than that. But stronger signals can activate the hardware 
AGC in the K3 or K3S and cause desensitization even though the QRM is 
outside the DSP bandpass.


The optimum situation is to have a filter whose bandwidth is close to or 
slightly wider than the DSP bandwidth that you are using. So if you 
often operate with the DSP bandwidth set to, say, 900Hz, having a 1kHz 
filter would be convenient. If you only had the stock 2.7 kHz filter, 
then an undesired S9+20 dB signal 1 kHz away from the signal you are 
listening to might cause the sensitivity of the receiver to vary and 
thus interfere with your ability to copy, even though you wouldn't hear 
the interfering signal.


So it depends on your operating habits. Since I am in the habit of 
listening to CW with the DSP set to 400Hz or below, the 1kHz filter 
doesn't do anything for me. I also think the value of the 200 Hz filter 
is marginal, although it has been helpful at times (like when a 
super-strong station one hop away from me is trying to deliberately QRM 
a DX station but is not exactly on the DX frequency).


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 25 Jul 2017 22:49, j...@kk9a.com wrote:

What is this used for?

John KK9A

From: Ralph Matheny K8RYU
Mon Jul 24 16:30:29 EDT 2017


Anybody got a 1 Khz filter for K3 they wanna sell??

de K8RYU

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Re: [Elecraft] 1 Khz filter

[Jim Brown]

On 7/25/2017 7:11 PM, Bill Breeden wrote:
I found that I was missing stations that were calling on the skirts of 
my 400 Hz filter, so I added a 1 kHz filter.  When I tune the band to 
answer CQs I still prefer listen through the 400 Hz filter. 


It's important to remember that IF bandwidth is determined by DSP, and 
continuously adjustable. The plug-in filters are ROOFING filters -- 
their primary function is to protect the DSP from overload by very 
strong stations outside the bandwidth of the DSP IF. They have the 
secondary function of adding the filtering provided by the DSP, and when 
the DSP and the roofing filter are at the same bandwidth, the filter 
skirts become steeper (sharper).


Bottom line -- we don't need to buy a 1 kHz filter to get 1 kHz IF 
bandwidth, because the DSP already provides that. This is not your 
grandfather's radio! :)


73, Jim K9YC

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Re: [Elecraft] 1 Khz filter

[Bill Breeden]

I added a 1 kHz filter to my "Field Day" K3 for the same reason, and I 
really like it.  When calling CQ on CW during Field Day a lot of folks 
who answer are using radios they aren't very familiar with and as a 
result they aren't zero beat very accurately when they call.  I found 
that I was missing stations that were calling on the skirts of my 400 Hz 
filter, so I added a 1 kHz filter.  When I tune the band to answer CQs I 
still prefer listen through the 400 Hz filter.


73,

Bill - NA5DX


On 7/25/2017 8:07 PM, Merv Schweigert via Elecraft wrote:
Same here,  perfect for contesting on CW,  I like to be able to hear 
almost

up to a KC up the band to pick up those who cannot zero beat,
I have 400 and 200 filters also,  but only use them for extreme 
conditions,

Merv K9FD/KH6


Hello John,

It's used for CW. I have a pair of them (main and sub rx) and find 
that CW
sounds more pleasing through this filter. I operate about 90% CW and 
I use

this filter most of the time, engaging narrower filters only when it
becomes really necessary.

73,

Dale -- WA8SRA

On Tue, Jul 25, 2017 at 3:49 PM, j...@kk9a.com  wrote:


What is this used for?

John KK9A

From: Ralph Matheny K8RYU
Mon Jul 24 16:30:29 EDT 2017


Anybody got a 1 Khz filter for K3 they wanna sell??

de K8RYU

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Re: [Elecraft] 1 Khz filter

[Dale Boresz]

Hello John,

It's used for CW. I have a pair of them (main and sub rx) and find that CW
sounds more pleasing through this filter. I operate about 90% CW and I use
this filter most of the time, engaging narrower filters only when it
becomes really necessary.

73,

Dale -- WA8SRA

On Tue, Jul 25, 2017 at 3:49 PM, j...@kk9a.com  wrote:

> What is this used for?
>
> John KK9A
>
> From: Ralph Matheny K8RYU
> Mon Jul 24 16:30:29 EDT 2017
>
>
> Anybody got a 1 Khz filter for K3 they wanna sell??
>
> de K8RYU
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to dmbor...@gmail.com
>
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Re: [Elecraft] 1 kHz Filter for K3

[W0MU Mike Fatchett]

I use a 1k filter in the main radio.  It would make no difference which
receiver is was installed into.

I use it quite a bit especially for turning the bands looking for dx or
mults.  When conditions get tough I switch in the narrower filters as
needed.  You probably want a 400 in addition to the 1k.  Flexibility is the
key. 


CC Packet Cluster W0MU-1
W0MU.NET or  67.40.148.194

A slip of the foot you may soon recover, but a slip of the tongue you may
never get over. Ben Franklin 



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Michael M. Raskin
Sent: Sunday, February 14, 2010 12:27 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] 1 kHz Filter for K3

Is anyone using the 1 kHz filter in the K3 subreceiver for CW?  Any pros or
cons?

Mike, W4UM 

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Re: [Elecraft] 1 kHz Filter for K3

[Vic K2VCO]

On 2/14/2010 11:26 AM, Michael M. Raskin wrote:
 Is anyone using the 1 kHz filter in the K3 subreceiver for CW?  Any pros or
 cons?

I have one in the main rx. I got it on the grounds that I would use it in 
contests when 
running, setting the bandwidth to about 800 Hz. to catch off-frequency callers. 
In fact I 
find that 400 Hz works best, because there are usually loud stations close by!

It's nice to have, but not as essential as I'd thought.
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Re: [Elecraft] 1 kHz Filter for K3

[Hector Padron]

Vic,I am using the 1K roofer as well as the 1.8,  2.8,  6.0 and of course for 
CW as well the 500Hz.
I use my 1Khz mainly for safe ragchewing on CW and also for brick selectivity 
on SSB but when your use it on voice,you must move the SHIFT to 050 to recover 
the inteligibility,its very effective reducing qrm from stations at less than 
2Khz apart.
 
AD4C
 

For a refined ham it is compulsory to own a k3

--- On Sun, 2/14/10, Vic K2VCO v...@rakefet.com wrote:


From: Vic K2VCO v...@rakefet.com
Subject: Re: [Elecraft] 1 kHz Filter for K3
To: elecraft@mailman.qth.net
Date: Sunday, February 14, 2010, 7:56 PM


On 2/14/2010 11:26 AM, Michael M. Raskin wrote:
 Is anyone using the 1 kHz filter in the K3 subreceiver for CW?  Any pros or
 cons?

I have one in the main rx. I got it on the grounds that I would use it in 
contests when 
running, setting the bandwidth to about 800 Hz. to catch off-frequency callers. 
In fact I 
find that 400 Hz works best, because there are usually loud stations close by!

It's nice to have, but not as essential as I'd thought.
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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