2.1 kHz filter - K3

[Michael Raskin]

I have the 2.8 kHz filter in the main receiver and want to supplement that
with either the 2.1 kHz or 1.8 kHz filter.  A friend who has the 1.8 thought
is was too narrow.  What are you guys using?  Anyone have all three?

Mike, W4UM

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[Bill W4ZV]

Michael M. Raskin wrote

I have the 2.8 kHz filter in the main receiver and want to supplement that
with either the 2.1 kHz or 1.8 kHz filter.  A friend who has the 1.8 thought
is was too narrow.  What are you guys using?  Anyone have all three?

You friend is wrong.  His experience is probably due to not properly adjusting SHIFT or HI CUT for best intelligibility.  When adjusted correctly, Fc should be ~1000 Hz and the 1.8k is quite readable.  In fact some are even using Inrad's 1.5k.  These narrowband filters are intended for communications in extreme QRM (e.g. contests or big DX pileups).  You don't want or need any narrower filters than the stock 2.7k/2.8k for casual operation.

http://n1eu.com/K3/K3_notes.htm  (scroll down to SHIFT setting)

73,  Bill

[Bob - W0GI]

I am using the 1500hz Inrad. As mentioned, you have to use the shift to make it work for SSB.

It is only needed for extreme close-in QRM, as I find the 2.7khz filter along with the DSP is fine for everything else.

I rarely have needed the 1500 for SSB, but I like it for wide CW tuning.

The K3 DSP is pretty good, and you may be wasting your money adding a 2.1, 1.8, or 1.5 unless you run into really strong close-in signals. I rarely do on SSB.

[Guy, K2AV]

> The K3 DSP is pretty good, and you may be wasting your money adding a 2.1,
> 1.8, or 1.5 unless you run into really strong close-in signals.

There ya go.  Contests.

73, Guy.
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[Philippe Trottet]

In addition to the 2.8 Khz,  I'm using the 1.8Khz (starting 2.1) , and also the 1khz (starting 1.6khz) used both in ssb & cw.
Sure with some little alteration of the voice but it is really a must in severe qrm environment as mine (no directional antenna and a lot  of pirates, fishermens etc....very active on that part of the world.)
One example, on the low part of 20m, specifically on 14.122,3 usb we have fishermens, Tamoul language, every day and we have the French speaking dx window for FO, FK.... on 14.122.
Even those illegal user are sometimes 59+ I'm able to pursue qso's at a 300hz difference that never happens with my previous rigs. As I say voice is alterated but readible when playing with the FC and width ~1.5Khz even less.
In that case I'm just increasing my power because I'm sure those fishermens are using marine rigs and do not have the selectivity of the Elecraft's... and they qsy most of time.
73's
Philippe A65BI
K3#3616


>>> "Michael M. Raskin" <[hidden email]> 09-05-2010 2:24 >>>
I have the 2.8 kHz filter in the main receiver and want to supplement that
with either the 2.1 kHz or 1.8 kHz filter.  A friend who has the 1.8 thought
is was too narrow.  What are you guys using?  Anyone have all three?

Mike, W4UM

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[AD4C2009]

Hi Mike,I backup Philipe,my K3 has for SSB the following filters: 6.0,  2.8  and 1.8 KhzWhen I ordered my K3 originally I thought the 2.1 was going to be enough for heavy close freq QRM and I was wrong,while it give good audio quality for SSB the 2.1 Khz is not enough to reject the QRM for stations at 2 or less Kz from your freq,then I sold it and purchased one for 1.8Khz,now I have a brick for qrm,is it too narrow as your friend thinks? no,its not at all,voice still sound readable specially when you move your Shift down to 1.00 but then you will have complete tight bandwith to be able to pull any weak stations even the qrm station be 59++ You can also narrow band more your audio using just the DSP down to 1.5 Khz and stiil sound ok to me for voice.So the 1.8Khz roofer have to be your choise.
AD4C"For a refined ham it is compulsory to own a k3"

--- On Sun, 5/9/10, Philippe Trottet <[hidden email]> wrote:

From: Philippe Trottet <[hidden email]>
Subject: Re: [Elecraft] 2.1 kHz filter - K3
To: "Michael M. Raskin" <[hidden email]>, [hidden email]
Date: Sunday, May 9, 2010, 6:19 AM

In addition to the 2.8 Khz,  I'm using the 1.8Khz (starting 2.1) , and also the 1khz (starting 1.6khz) used both in ssb & cw.
Sure with some little alteration of the voice but it is really a must in severe qrm environment as mine (no directional antenna and a lot  of pirates, fishermens etc....very active on that part of the world.)
One example, on the low part of 20m, specifically on 14.122,3 usb we have fishermens, Tamoul language, every day and we have the French speaking dx window for FO, FK.... on 14.122.
Even those illegal user are sometimes 59+ I'm able to pursue qso's at a 300hz difference that never happens with my previous rigs. As I say voice is alterated but readible when playing with the FC and width ~1.5Khz even less.
In that case I'm just increasing my power because I'm sure those fishermens are using marine rigs and do not have the selectivity of the Elecraft's... and they qsy most of time.
73's
Philippe A65BI
K3#3616


>>> "Michael M. Raskin" <[hidden email]> 09-05-2010 2:24 >>>
I have the 2.8 kHz filter in the main receiver and want to supplement that
with either the 2.1 kHz or 1.8 kHz filter.  A friend who has the 1.8 thought
is was too narrow.  What are you guys using?  Anyone have all three?

Mike, W4UM

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[Bill K9YEQ]

The 1.8 is a fabulous choice.  Open up the DSP filter width and you will be
impressed.

Bill
K9YEQ
 
-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Guy Olinger K2AV
Sent: Saturday, May 08, 2010 9:57 PM
To: Bob - W0GI
Cc: [hidden email]
Subject: Re: [Elecraft] 2.1 kHz filter - K3

> The K3 DSP is pretty good, and you may be wasting your money adding a
> 2.1, 1.8, or 1.5 unless you run into really strong close-in signals.

There ya go.  Contests.

73, Guy.
______________________________________________________________

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