Phil and Christina wrote:
Hi Kevin,
The last few times I have checked in were with the K3 at 100 Watts.
When I point my quad north I usually can tell that you are in there,
but can't always copy much.
73,
Phil NS7P
Sunday, I couldn't hear Kevin at Z on 20. By 0005Z, he was S-6 and
I
. I hope to be able to purchase a K3 someday if Elecraft doesn't go
belly up first.
73,
Steve Brandt N7VS
Portland, Oregon
Steve,
I wouldn't wait that long, you may be too old to enjoy it. :-)
73,
Tony W7GO
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Elecraft
Thanks folks, you've offered me some really helpful information. If
this was a website forum I'd suggest these ideas be part of a
sticky for others would find them most helpful too.
Maybe the folks at Elecraft might add a pdf to their info section/FAQ
with such helpful pointers for the new
You are making the incorrect assumption that we have no
control over the upper or lower limits. If band or sky noise
is the limiting factor on the low end, then adding
attenuation in front of the ADC to adjust for this has the
benefit of increasing the high end limit also. This ideally
John
Can't help you with numbers, just the experience of friends in that
situation, ie they can operate with special receivers having special mixers,
often home brew, whereas it is impossible without.
David
G3UNA
David Cutter wrote:
Some folk suffer extremely strong QRM from broadcasters
On Mon, Dec 1, 2008 at 8:38 PM, Joe Subich, W4TV [EMAIL PROTECTED] wrote:
Of course, but there is still a finite range between the
two limits. The maximum instantaneous peak is driven by
the number and strength of incoming signals and the minimum
discernable signal level is defined not by
On Mon, Dec 1, 2008 at 4:48 PM, Kok Chen [EMAIL PROTECTED] wrote:
On Monday, December 01, 2008, at 01:16PM, Bill W4ZV [EMAIL PROTECTED]
wrote:
...which is why the hybrid approach of a narrow roofing filter before the
ADC works so well in Orion and the K3.
Bill is correct.
Think of this
Hi Lenmart,
http://webshop.multitech.se/PartDetail.aspx?q=p:358526;pl:1
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: Lennart Michaelsson [EMAIL PROTECTED]
(HP does not sell any plug in USB/serial cards whih would have been a
natural solution)
On Mon, Dec 1, 2008 at 9:02 PM, Bill W4ZV [EMAIL PROTECTED] wrote:
Joe Subich, W4TV-3 wrote:
Processing
gain may be of value at microwave frequencies with a quiet
sky but it is not going to help below 10 MHz with extreme
signals and high noise levels.
Joe, as near as I can tell, you've
Its dynamic range may be OK for IMD but today's SDRs cannot approach the BDR
of
rigs like the K3 until even higher resolution ADCs become available.
Sorry to tell you a bad new: you are wrong!
Nico Phil,
When can we expect to see direct R.F.-sampled SDRs with better MDS performance?
they used five (5) K'3. Neat.
http://lists.contesting.com/pipermail/3830/2008-December/164648.html
de Doug KR2Q
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Lennart SM7BIC wrote on Tuesday, December 02, 2008 at 11:18 AM
However it turned out that his
recommended converter Keyspan usa-19hs including a serial cable cannot be
found in SM and Amazon.com as an example does not export those precious
little gems outside NA.
The difficulty is obtaining device drivers for Windows Vista 64, not the
more common Windows Vista 32. Drivers are available from Microsoft Update
for the Prolific chipset USB to Serial adapters (such as the KUSB) for
Windows Vista 32.
Dick, K6KR
-Original Message-
From: [EMAIL
Nico Palermo, IV3NWV wrote:
You are not replying my question, Bill.
I've simply asked if you are able to listen to a -105 dBm with a + 7 dBm
inteferer placed at
a 2 kHz offset with your receiver.
You have two choices:
1) No, I can't.
2) Yes. I can.
If the reply is #1 you should explain me why
Old engineer says, If I can measure it, but not hear, taste, feel or see
it, do I care?
I.E. my old ears cut off at about 12kHz, so I don't care if my stereo can
reproduce tones at 20kHz.
I sometimes think we forget the fact that we are limited by our human signal
processing systems.
A
Lennart Michaëlsson wrote:
Hi all,I have been using my old PC with Winndows XP ever since I got my K3
last April without any trouble downloading F/W into the K3 using the
Prolific USB converter.
Now having got a new HP (64bit) with Vista installed I am stuck as Vista
does not support
Hi all,I have been using my old PC with Winndows XP ever since I got my K3
last April without any trouble downloading F/W into the K3 using the
Prolific USB converter.
Now having got a new HP (64bit) with Vista installed I am stuck as Vista
does not support the Prolific or vice versa.
(HP does
Milt,
I heard you OK (RST 549) it's just that I was in the 160m SOSB QRP
section (the antennas I had all worked very well) and I only managed to
work 4 USA stations, K1TTT being one of them nonetheless... no surprise
there then.
I managed 340 QSOs, 46 countries and 10 zones, 18hrs of
On Tue, Dec 2, 2008 at 6:37 AM, Philip Covington [EMAIL PROTECTED] wrote:
The difference is that while W8JI may be an expert in many other
(analog) areas, his disparaging comments made on various mailing lists
shows an ignorance in the SDR realm (except maybe for a bad experience
with a
On Tue, Dec 2, 2008 at 6:49 AM, Paul Christensen [EMAIL PROTECTED] wrote:
Its dynamic range may be OK for IMD but today's SDRs cannot approach the
BDR of
rigs like the K3 until even higher resolution ADCs become available.
Sorry to tell you a bad new: you are wrong!
Nico Phil,
When can we
Lennart -
I use a 64-bit HP PC with 32-bit Vista Home Premium OS in my shack and it
runs the USB-Serial adapter just fine. I have, however, switched to a
serial port to minimize noise in the receiver. I am using a PCI Express
card that provides 2 ports. These are expensive, but I am pretty
Hi Phil,
There is no inherent reason why the MDS could not be that low in
direct sampling SDRs. It is mainly a matter of design
decision/implementation.
This may be a stupid (or at least ignorant) question, but if the dynamic
range of the ADC itself is defined by the number of bits it
now
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Help:
Philip Covington wrote:
problem of the phase noise of the LO. Even QSD based SDRs which use
a DDS for the LO have worse phase noise (and spurs) than the crystal
oscillator LO in direct sampling receivers like the Perseus or QS1R.
It seems to me that high speed A/D conversion is much more
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
[EMAIL PROTECTED] wrote:
Philip Covington wrote:
problem of the phase noise of the LO. Even QSD based SDRs which use
a DDS for the LO have worse phase noise (and spurs) than the crystal
oscillator LO in direct sampling receivers like the
Philip Covington wrote:
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
It may seem that way to you, but in real life it turns out the the DDS
generates spurs due to only approximating a sin function, clock
leakage, number of bits, etc... There is not the same issue in the
There is no
Bill,
the phase noise of Perseus is as follow:
Offset (kHz) 25 1020 50
Phase Noise (dBc/Hz) -141 -145 -148 -151 -155
As a picture is worth one thousand words, see here for more:
http://microtelecom.it/perseus/tests/Perseus-phasenoise.jpg
To make the test, the phase
On Tue, Dec 2, 2008 at 10:27 AM, David Woolley (E.L)
[EMAIL PROTECTED] wrote:
Philip Covington wrote:
On Tue, Dec 2, 2008 at 8:05 AM, David Woolley (E.L)
It may seem that way to you, but in real life it turns out the the DDS
generates spurs due to only approximating a sin function, clock
Nico Palermo wrote:
You probably are unaware that an ADC dynamic range in a given bandwidth
does not depend just on its ENOB (effective number of bits) but also on
the sampling frequency.
Surely, in terms of the interfering signal, that bandwidth is something
like 30MHz, rather than the
Hi Kevin,
The last few times I have checked in were with the K3 at 100 Watts. When I
point my quad north I usually can tell that you are in there, but can't always
copy much.
73,
Phil
NS7P
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Kevin Rock
I'm somewhat puzzled by the behavior of the AGC THR adjustment with respect
to band noise. My understanding is that the AGC THR setting adjusts the
level at which the AGC is activated. Thus, I would expect when listening to
band noise (QRN) that if the noise is activating the AGC, using a higher
Rig 1kHz2 10 20 50 100 1M
K3 -110 -119 -136 -140 -143 -144 -150
IC7800 -103 -112 -130 -138 -140 -140 -140
FT2000 -102 -105 -128 -129 -128 -128 -128
ORION 2 -121 -129 -126 -125 -118 -128 -138
OMNI 7 -102 -103 -120 -123 -127 -129 -126
F5000 -123 (same at all
Had a blast building the new K3 last night! What a GREAT kit!!
The only glitch I ran into was the KXV3 components came with a second copy
of the KPA3 manual?? Took me about 10 minutes to realize it was the wrong
document. Hey, it was late! Downloaded the correct one from the Elecraft
site
Steven.Zabarnick wrote:
I'm somewhat puzzled by the behavior of the AGC THR adjustment with
respect
to band noise. My understanding is that the AGC THR setting adjusts the
level at which the AGC is activated. Thus, I would expect when listening
to
band noise (QRN) that if the noise is
Barry N1EU wrote:
Steven.Zabarnick wrote:
I'm somewhat puzzled by the behavior of the AGC THR adjustment with
respect
to band noise. My understanding is that the AGC THR setting adjusts the
level at which the AGC is activated. Thus, I would expect when listening
to
band noise
Steve,
Yes, I know it sounds counter-intuitive, but if you establish the right
frame of mind, it does become clear.
You might want to consider that the audio level from the K3 is what is
heard after the AGC is applied.
If you set the threshold so low that the band noise activates the AGC,
Jack's measurements of the K3 AGC on the link listed below are quite
interesting. As my noise level on the low bands is usually at least S3 or
4, his plots indicate that the noise (S3 is approx -90 dBm) is either in
the linear range of the AGC, or just barely in the software AGC range.
Don't we
Oops, mistakenly sent this with the wrong subject line.
Jack's measurements of the K3 AGC on the link listed below are quite
interesting. As my noise level on the low bands is usually at least S3 or
4, his plots indicate that the noise (S3 is approx -90 dBm) is either in
the linear range of the
Hi Guy's
Thanks for the interesting discussion on the state of the art in SDR
technology. This discussion does raise a few questions in my mind that I
would like to ask. To me it is a question of the theoretical as opposed
to the practical. Does it really matter if a receiver can hold up to a
To my initial question:
I'm ordering the K3 100W kit and have a K9AY receiving antenna and
will be using a Titan 425 amplifier with it. I have several power
supplies I can use with one being the larger Heathkit 13.8 supply
which works fine with my TenTec gear. I also have a TenTec power
You should also consider the Heil Goldline mic for it. That is if you
operate phone.
73,
matt zilmer
On Tue, 02 Dec 2008 14:34:15 -0500, you wrote:
To my initial question:
I'm ordering the K3 100W kit and have a K9AY receiving antenna and
will be using a Titan 425 amplifier with it. I
I so rarely use phone, really enjoy the challenge of CW. Did use a
mic last weekend to ask a question of non contesting hams to check my
signal quality as someone said I was sending out clicks all over the
band. (Turns out the signal was clean it was just a lid pestering
me).
I do have a Heil
At 05:37 PM 11/30/2008, N6BV wrote:
So, how was diversity on the K3? I'll bet lots of folks would like
to know!
Worked great, Dean. Last week, with help from K6IAM, Software
version 2.67 was loaded into my K3s. This enabled two features that
made DIVERSITY a joy to use:
1.
Steve,
If you attempt to use AGC to change the noise level, you will also be
potentially pushing all the signals down to that level as well (how much
so depends on the amount of AGC slope you have dialed in.
A receiver's sensitivity is measured at the antenna input end, and if I
understand
Gary, KA1J, wrote:
Any other suggestions regarding a heads up perhaps regarding
specialty assembly/test equipment I will need to be ready for the k3
100W kit?
The most helpful tool for me was a nice tweezers
to pick up all those little lockwashers. As far as
test equipment goes, a standard
On 1 dec 2008, at 19.12, Jim Brown wrote:
Interesting propagation from several locations on 20M caused very
strong
echoes that ran characters together to the point that I couldn't
copy them
at all. One example was about 1800Z Sunday for signals from anywhere
NE USA
and eastern Canada
John KD8K wrote:
. This discussion does raise a few questions in my mind that I
would like to ask. To me it is a question of the theoretical as opposed
to the practical. Does it really matter if a receiver can hold up to a
80db over 9 signal 2 KHz away or is this just a theoretical exercise?
For building the K3/100, there's a complete list of essentials in the
assembly manual. Look under Tools and Test Equipment Required. The manual
is available on the Elecraft web site.
Ron AC7AC
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On Tue, 2 Dec 2008 14:14:25 -0800, Ron D'Eau Claire wrote:
For building the K3/100, there's a complete list of essentials in the
assembly manual.
Having built two K3s and added a KRX3, my list of essentials is pretty
short. It's hard to imagine a ham needing to buy anything, except maybe
the
Last year, I upgraded my K2 from rev A to Rev B. Afterwards the dial was
off by 12 KHz at 10MHz, even after setting the 4Mhz crystal, doing CAL
PLL, CAL FIL more than 30 times. Yes, I followed every procedure posted
and verified the 4 MHz clock accurately. Prior to the upgrade, the dial
was
Some folk suffer extremely strong QRM from broadcasters on 40m (particularly
on the east coast of Scotland) and to them there is a real desire for the
best possible gear to hear weak stations amongst huge bc signals from
Europe. That's where receivers like the Perseus and others come in to
Bill and All,
I'm not an ardent contester, so this is a serious question--not a criticism.
I did jump in this year on a very erratic basis, which only yielded about
110 Q's. But I'm curious--how does ENN AU convert to 599 21? More
specifically, the E and the AU part? I know it is getting
After operating a few contests with my K3, I think I may need to upgrade
roofing filters, especially on SSB. I have the stock 2.7 and the 5 pole 500Hz
CW installed now.
Can anyone comment on the real world contest performance of the 8 pole vs. the
5 pole filters? On SSB with the width dialed
- Original Message -
Toby Deinhardt wrote:
I hope you don't mind my being at slightly sceptical that a low pass
filter is enough for serious LW/MW work. If one has a medium wave or long
wave broadcast stations in the vicinity, then additional filtering will
almost surely be
[EMAIL PROTECTED] wrote:
After operating a few contests with my K3, I think I may need to upgrade roofing
filters, especially on SSB. I have the stock 2.7 and the 5 pole 500Hz CW
installed now.
Can anyone comment on the real world contest performance of the 8 pole vs. the
5 pole
filters? On
Hi everybody,
I totally agree with all who stated a superb filtering performance of the K3 in
the real combat situation on the ground. This was my first CQWW CW contest wth
this rig and in the Low Power category (usually I do QRP). With the only dipole
antenna for 80-10m and a surrogate
David Cutter wrote:
Some folk suffer extremely strong QRM from broadcasters on 40m
(particularly on the east coast of Scotland) and to them there is a
real desire for the best possible gear to hear weak stations amongst
huge bc signals from Europe. That's where receivers like the Perseus
I agree that there were quite a few stations running ultra high speed CW. They
should slow down a bit or at least answer a station replying at a slower speed.
I'm not sure just what the definition of really slow speed is these days, but
some operators, myself included, love to use a straight
Well put. I learned code from a former world war II Merchant Marine radio
operator back in the 60's. He had me copying 25 wpm code groups, not plain
language, effortlessly by the time I took my Extra class code test. I used
to be able to carry on at 25 wpm. But I found 18 - 20 wpm was a very
I have to agree with the reasoning behind John's comments here. As
has been opined by many, the K3 really shines its brightest on CW,
where spurious transmitter products are typically limited to the
occasional key clicks. The percentage of misadjusted and badly
offending transmitters is MUCH
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