[Elecraft] 2.1 kHz filter - K3

[Hector Padron]

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 <TROTTET at unhcr.org> wrote:

From: Philippe Trottet <TROTTET at unhcr.org>
Subject: Re: [Elecraft] 2.1 kHz filter - K3
To: "Michael M. Raskin" <rask1553 at bellsouth.net>, elecraft at mailman.qth.net
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" <rask1553 at bellsouth.net> 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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