Mark,
If the roofing filter was added to your original order, it will be
calibrated at the factory (even if it is a kit).
If you add the roofing filter later, you will have to do the calibration
for optimum results.
73,
Don W3FPR
On 1/29/2018 5:31 PM, Mark Petiford via Elecraft wrote:
Message: 22
Date: Mon, 29 Jan 2018 16:20:06 -0500 (EST)
From: stan levandowski <sjl...@optonline.net>
To: Elecraft@mailman.qth.net
Subject: [Elecraft] KX3 Roofing Filter Question
Message-ID: <765520bb.1faf0.16143ca985b.webtop...@optonline.net>
Content-Type: text/plain; charset=UTF-8; f
happy if I could use a sensitivity of a 1 uV on 80.
73,
Barry
K3NDM
-- Original Message --
From: "stan levandowski" <sjl...@optonline.net>
To: Elecraft@mailman.qth.net
Sent: 1/29/2018 4:20:06 PM
Subject: [Elecraft] KX3 Roofing Filter Question
I am going to order anoth
In general, filters have little to do with sensitivity. On the other
hand, filters do provide selectivity. In crowded band conditions where
one is attempting to dig out a weak signal among stronger signals, the
roofing reduces the likelihood that the stronger signal will impact the
overall
Re: "If you do choose the roofing filter, be certain you do the calibration
if it is a kit."
Don,
My kit build KX3 instruction manual says that I don't have to do the
calibration if I ordered the filters WITH my KX3 kit:
"If you received the optional KXFL3 filter with your kit, you do not
Stan,
I am not going to give you a terse answer, but I can say that the
sensitivity of the KX3 does not depend on the roofing filter.
However, the roofing filter will give you more rejection of unwanted
signals that you may encounter in crowded band conditions.
If you do not operate when
I am going to order another KX3 this week. Probably tomorrow. The last
one I ordered in 2012 did not have the roofing filter option and I do
not THINK I missed it.
I use ONLY CW and I do NOT contest. I like to CASUALLY chase DX and I
play in low stress sprints like NAQCC but mostly I just
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred
Jensen
Sent: Tuesday, March 24, 2015 10:49 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KX3 Roofing filter question
Joshua, Probably not. The ultimate BW of your receiver is set by the DSP
If you have lots of atmospheric noise, you may have too much gain in your
revive chain, and should maybe consider switching off the preamp/switching on
the attenuator.
There is also the NR noise reduction feature which may be useful. However on
CW I find that narrowing the PBT bandwidth cuts
All,
Would the roofing filters help reduce atmospheric noise? I'm having a heck
of a time hearing anything over the S5 noise levels that I seem to be
dealing with of late. But at least it's better than the S9 noise I was
getting from switching power supplies under my desk...
72,
Joshua Gould
Joshua, Probably not. The ultimate BW of your receiver is set by the
DSP and noise power is sort of proportional to BW. The purpose of the
roofing filters is to protect the ADC sampler at the head end of the DSP
from very strong signals that could drive it to saturation.
Noise, other than
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