Bruce,
Below are the receiver sensitivity specs from page 42 of the recently
updated manual
Sensitivity (MDS)
(Typical values; main or
sub RX, BW = 500 Hz)
0.1-1.5 MHz*: Preamp OFF/1/2: -120/-130/-135
dBm
1.5-23 MHz: Preamp OFF/1/2:
-120/-132/-137 dBm
23-54 MHz: Preamp OFF/1/2:
-120/-132/-141 dBm
*0.1-1.5 MHz MDS measured at RX antenna inputs. When
using shared RX/TX antenna, sensitivity decreases
below 1.5
MHz due to intentional high-pass response of T-R
switch.
de Dave K5MWR
On 1/19/2021 12:40, BRUCE WW8II wrote:
I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the
noise floor on SSB now, (that is why I presently own a K3s and a P3VGA) so
I guess I will have to wait for the real answer. I really cannot
believe that Elecraft did not run their own test. If and when I spend my
cash I am not looking for the pretty blinkie colored lights and a fancy
screen, I want performance. My really big issue is: receiver noise floor,
sensitivity and DSP that does not distort or degrade the incoming signal.
But thank all of you for your input and I truly appreciate all the
comments.
Bruce
WW8II
On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft <
elecraft@mailman.qth.net> wrote:
That's not a simple or easy question to answer, especially since there's
been no independent test of a K4, and there are many different criteria
that go into it. That said, I'll go out on a limb and say that in most
all practical situations on the air, it won't be. I say that because I've
listened to and half-assedly compared a number of very good radios and some
less good radios on the air. They might sound different, and take some
tweaking of the controls to make them sound a similar as possible, but in
the end I couldn't copy sigs better on one than the other. The K3 is really
good in the tests, and I'm confident the K4 will surpass it, but that's at
level that will only matter in what I consider to be exceptional
circumstances.
I'll add that I'm not the radio connoisseur that some are, and what I feel
is largely the same, others may find hugely different. That doesn't stop me
from wanting the best, even if I believe it won't make a practical
difference in my operating.
On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II <
wa8...@gmail.com> wrote:
I also would appreciate a real answer to the question. The question is
will the K4 or K4D be as good or better on receive than my K3s with the
2.1kHz and the 200Hz filters.
Bruce WW8II
On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft <
elecraft@mailman.qth.net>
wrote:
I believe there are no crystal Roofing Filters in the standard K4 model.
Yet the manual talks about "one set of receive filters". Please advise
the
type and bandwidth of these filters? (DSP?)
From the K4 Manual: There are three models: the basic K4, with one set
of
receive filters and one analog-to-digital converter (ADC); the K4D, with
a
second set of receive filters and a second ADC; and the K4HD, which adds
a
superheterodyne front end that can be enabled as needed to provide even
greater dynamic range. The superhet module uses high-performance,
narrow-band crystal filters such as those used in the Elecraft K3S.
Thanks
& 73, Dick- K9OM
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