of
your station
http://www.kl7uw.com/emelink.xls
73, Ed - KL7UW
--
Message: 15
Date: Fri, 2 Apr 2010 06:56:08 -0600
From: Bill VanAlstyne W5WVO w5...@cybermesa.net
Subject: Re: [Elecraft] K3 - Performance on 6M?
To: elecr...@astromag.co.uk, elecraft@mailman.qth.net
, April 03, 2010 6:03 PM
Subject: Re: [Elecraft] K3 - Performance on 6M?
Very good inquiry into how much improvement the PR6 preamp will provide.
I suspect that the average ham is not very familiar with calculations
of noise figure, MDS, etc.
One common error is to think that preamp gain
On Fri, 2 Apr 2010 17:50:23 -0500, Bill K9YEQ wrote:
I want to work more 6m signals and need to know the testing method. If
signals are that better then I need to add the external unit.
As often happens, this thread has gotten way out of hand, with Busby
Berkeley swarms of angels dancing on
...@comcast.net]
Sent: Friday, April 02, 2010 7:35 PM
To: Joe Subich, W4TV
Cc: James Duffey; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - Performance on 6M?
Joe - I went back and did the calculation again for both
conditions. I had made a small mistake in calculating the
combination
Jeff, you will probably need a pre-amp with the K3. My experience of 6m
over the past 3 or 4 years with a 4 ele quad is that many signals are
very weak and the K3 lacks the sensitivity to deal with them unless you
either add a pre-amp or have a high level of local noise masking those
signals.
knowledgeable comments.
Bill W5WVO
--
From: Dave, G4AON elecr...@astromag.co.uk
Sent: Friday, April 02, 2010 4:25 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - Performance on 6M?
Jeff, you will probably need a pre-amp with the K3. My
G'day,
No big deal but to avoid any confusion the archived mail quoted is
rather a hybrid, the analysis is my observations on reception of the
BA beacon.
Not been listening on 6M much just lately because the coax for the
beam has been diverted to a temporary 80M dipole, soon to come down.
I
It has been said by many hams over the years that if you
connect an antenna
to a receiver and you can hear the noise level increase,
then you don't need
a preamp, as it will simply amplify the noise and the signal
equally. In
general, I've found that to be true. HOWEVER...
Let's say that the
I'm going to violate the Top posting is the rule rule for this one.
--- On Fri, 4/2/10, Bill VanAlstyne W5WVO w5...@cybermesa.net wrote:
Let's say that the noise figure of the receiver's internal
preamp is 1.5 dB,
and the noise figure of the external preamp is 0.5 dB. Each
preamp will give
No need to speculate on the 6M K3 NF, we can calculate it. Computing the K3
noise figure from the minimum discernable signal (MDS) gives
preamp off 18 dB (K3/100 test) to 20 dB (K3/10 test)
preamp on12 dB (Same in both tests)
compare these to other 6M rigs out there:
IC-551D
The K3's typical MDS on 6M, with the internal pre-amp ON, out of the
factory is closer to -133 to -135 dBM. (I just confirmed this with our
production test techs.)
If you are seeing something in the mid -120s on any band with internal
pre-amp ON, there is something wrong.
73, Eric WA6HHQ
Duffey
Sent: Friday, April 02, 2010 4:54 PM
To: elecraft@mailman.qth.net
Cc: James Duffey
Subject: Re: [Elecraft] K3 - Performance on 6M?
No need to speculate on the 6M K3 NF, we can calculate it. Computing the K3
noise figure from the minimum discernable signal (MDS) gives
preamp off 18 dB
,
... Joe, W4TV
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of James Duffey
Sent: Friday, April 02, 2010 5:54 PM
To: elecraft@mailman.qth.net
Cc: James Duffey
Subject: Re: [Elecraft] K3 - Performance on 6M
Eric - I used the numbers from the January 2009 QST tests, where the ARRL
measured -136 dBm MDS with the internal preamp on, and either -130 dBm in a 400
Hz bandwidth or -128 dBm in a 500 Hz bandwidth with the preamp off.
using
MDS = -174 dBm + Noise Figure + 10*log(Bandwidth)
Noise Figure =
Joe - I went back and did the calculation again for both conditions. I had made
a small mistake in calculating the combination previously.
K3 external preamp on, internal off, Noise Figure for combination = 3.3 dB
Which should be good for most work.
K3 external preamp on, internal on, Noise
Hello Jeff,
The K3 is an outstanding rig on 6m. The flat bandpass is ideal for weak signal
digital work, and the noise blanker really shines on 6m, where noise seems to
be
so prevalent. The PR6 preamp is excellent, and you WILL need it. If you keep
your feedline loss under 1.0 dB, you will
that comes with the
stock K3 and I am happy.
Willis 'Cookie' Cooke
K5EWJ
From: Jeff Cochrane - VK4BOF bof...@gmail.com
To: elecraft@mailman.qth.net
Sent: Thu, April 1, 2010 9:03:34 PM
Subject: [Elecraft] K3 - Performance on 6M?
Hi everyone,
Sorry to trouble
.
(But not for much longer!)
- Original Message -
From: WILLIS COOKE
To: Jeff Cochrane - VK4BOF ; elecraft@mailman.qth.net
Sent: Friday, April 02, 2010 1:38 PM
Subject: Re: [Elecraft] K3 - Performance on 6M?
Jeff, I don't claim to be a 6 meter expert. The K3 is the only radio I
Jeff, I bought my K3 in large part for VHF/UHF contesting. The receiver is
excellent for 6 meter weak signal work, but you will want to get the PR6
preamp. I concur with others that it is highly desirable, and also that it
will give you as much performance, with less hassle, than a masthead
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