this by using a wideband,
and therefore low group delay, detector for the noise pulses, and then
gating the signal after the main selectivity filters, with their
relatively large group delay.
--
David Woolley
we do not overly restrict the subject matter on the list, and we
encourage postings
on amateur radio in Hong
Kong and South China. They have several Elecraft rigs amongst their
members.
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, on
flash. The next alternative would be Linux.
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that is no longer good advice, as archive address hiding may not work
) and 5a of the list
charter, at http://www.elecraft.com/elecraft_list_guidelines.htm.
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drivers, at a price, but if they don't
USB radios will rapidly become doorstops.
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, or using pre-emptive filtering. I
suppose it is just possible that Elecraft have characterised the
harmonic output on MARS frequencies, although I suspect not.
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The Elecraft list is a forum for the discussion of topics related to
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databases.
Incidentally, logging in is valuable for advertising funded databases,
as it makes it easier to target advertising at individual.
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world
AC6JA
**An Excellent Credit Score is 750. See Yours in Just 2 Easy
Steps!
(http://pr.atwola.com/promoclk/100126575x1221823249x1201398664/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072hmpgID=62bcd=May
ExcfooterNO62)
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thermal load, I think the
building structure dissipation will be the most important factor.
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cause a problem is that the 4MHz oscillator
shouldn't actually be exactly 4MHz to get exact frequency counter operation.
It's some time since I did this, but there are details in the archive,
and probably on the web site.
--
David Woolley
The Elecraft list is a forum for the discussion
for a
given input power.
When one says is a transmitter is matched to 50 ohms, one actually means
that its output network presents the optimum load to the finals when
feeding a 50 ohm load.
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The Elecraft list is a forum for the discussion of topics related to
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components, as case
temperatures can get a lot higher than 45C. Having a large thermal
mass will help protect the equipment as the sun should start to go down
before the maximum temperature is reached.
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Elecraft
have a real problem.
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an integral term), and industrial
controllers may well be three term.
The wildly varying thermal input probably means that any sophisticated
controller would need to be aware of transmission.
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The Elecraft list is a forum for the discussion of topics related to
Elecraft products
dominant, or may
just represent the point where the manufacturer considers MTBF
unacceptable.)
early comments on heat design criteria was for 10m key down, 100%
duty cycle, without damage. But that is just the memory talking. YMMV
--
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The Elecraft list is a forum for the discussion
, in which case just ignore this
message, but if by chance many other people are having the same problem,
then perhaps Elecraft should consider moving the reflector to Yahoo Groups.
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The Elecraft list is a forum for the discussion of topics related to
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document code as
though one expected to be run over by a bus, the next day.
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after the net was over.
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suspect a machine
translation.
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partly why radio astronomy is possible, even
though the antenna may be at 30 degrees C - the conduction electrons are
cold, even though the atoms are hot. Also, the devices read the average
emissions in their field of view, and soldering iron tips are quite small.
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as the counterpoise.
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) in the
list of codecs.)
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Post: mailto:Elecraft@mailman.qth.net
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Please help support this email list: http://www.qsl.net/donate.html
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from using the K3 DSP as a roofing filter.
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to
nothing, and then the government uses class licences and paid for
licences, to selectively relax that.
What the UK does tend to do is ban reception based on use/intention,
rather than equipment capability.
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David Woolley
Emails are not formal business letters, whatever businesses may
is that the problem is that they have to prove to the
FCC that scanning is disabled outside the amateur band, and there is a
cost in doing this. I imagine they would have to repeat the process
every time they issued new firmware.
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The Elecraft list is a forum for the discussion
, will start at 64 seconds and increase to 1024 seconds, if
it thinks that that will give the best compromised between phase and
frequency error.
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List
presume you mean has more gain than is more sensitive (it may be
sensitive as well, but that is not defined by the loudness of the output).
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images with predominantly low spatial
frequencies (people and many natural scenes). This image is discrete
tone with most information in high spatial frequencies.
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here
the reference implementation, or chrony.
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will
still break threading.
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.
For wristwatch and eyeball accuracy for logging W32Time may be OK, but
not, especially out of the box, for anything that requires accurate time
synchronisation.
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The Elecraft list is a forum for the discussion of topics related to
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are right on the money. I have installed the
SSB, NB, and KPA100 if that helps at all.
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and don't have PKZip, WinZip or InfoZIP,
at the expense of encouraging poor security practice.
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enough for the sender to
assume a failure and resend.
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in
tolerance! There should be no need for a fix.
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by a data centre would normally
always use the inverter, the argument being that it avoids mains
transients (and, presumably, gives a cleaner switch over).
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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. A
very mismatched load could, presumably, give a very low forward power.
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is, and that is
one reason I am using a K3 and not a radio that depends on a PC to
function.
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, but will play havoc
with digital modulation.
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. The serial driver will already have been installed
when the system (or serial interface card) was installed.
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commercial move
to up-conversion.
One other thing. I'm not clear whether people are really complaining
about sensitivity, or whether they are actually complaining about gain.
Sensitivity is about signal being louder than noise. Gain is about both
signal and noise being loud.
--
David
stripping the enamel off these than I did with the KX1 for some reason.
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of the DAC.
The PLL Reference osc stays at 12.099 Mhz.
But you previously said that the reference oscillator range check
passed, which indicates that control voltage is being varied. I think
this symptom arises from a failure to calibrate.
--
David Woolley
The Elecraft list is a forum
right?
Page 80
For Tx alignment, what is the recommended HiCur limit set in the K2?
I'm hitting HiCur only on the 10 and 12m combo as I find the peak.
3.5 Amps, or what it says in the manual.
--
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The Elecraft list is a forum for the discussion of topics related
developers actually
choose languages for similar reasons to amateurs; the main difference is
that having the latest buzzword language is more important to them.
Some of the biggest users of more technical programming tools are
actually freeware writers.
--
David Woolley
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in .NET).
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to be considered obsolete by
Microsoft, and the lowest levels of abstraction they really want to
support, for normal programmers, is a TCP connection, although they
might prefer it to be the .NET remote procedure call level)
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The Elecraft list is a forum for the discussion of topics
only blind copied the list!
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work
as long as possible.
However much they caveat an answer by but this may completely change,
a lot of people will take it as a commitment.
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design load.)
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).
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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can get
increased power by downgrading the firmware.
There is quite a significant lobby on this list for the radio to impose
no restrictions in firmware.
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The Elecraft list is a forum for the discussion of topics related to
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David Woolley wrote:
I believe the silvered ones do work like mats.
As people seem to be under the impression that metalised bags are highly
conductive, I measured one, and it comes out to be about 4 MOhm/square,
which is not very conductive by my standards. In fact, within
that are not shelded
but are simply made of a plastic which will not generate static
electricity. A ESD bag is not a suitable replacement for a mat.
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difficult to
do accurately than high speed D/A conversion, so any degradation in
converting the LO to analogue is going to be more than compensated for
by that in converting a wideband signal to digital.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
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
the 2.8kHz in the K3 type of SDR.
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noise
reduction, on the K2, only noise blanking.
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no effect on the cost of kits.
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=load105044catId=2500042
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in the hearing aid industry.
I suspect that is where most research has been done on the topic.
In the limit, you are competing with a device that is already rather
good at the job, the human brain.
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The Elecraft list is a forum for the discussion of topics related to
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limits to Customs duty for goods imported by
post (Acrobat PDF, 18KB)
http://customs.hmrc.gov.uk/channelsPortalWebApp/downloadFile?contentID=HMCE_PROD1_028770
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The Elecraft list is a forum for the discussion of topics related to
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of
the effective receiver noise contribution.
In this case, there is no splitting loss, and the noise is uncorrelated
because it is being received at different locations.
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The Elecraft list is a forum for the discussion of topics related to
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be towards the low end, but it can't be at the bottom end, because it
has requirements that it minimise disturbance to its host. One also
gets examples of hardware sharing in purely analogue add-ons, e.g. an FM
adaptor is basically a cut down FM receiver.
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The Elecraft list
cards have a constant group delay anti-aliasing filter.
http://www.rsgb.org/membersonly/radcom/techfeatures/sdr_1208.pdf
/div
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than most programme material.
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Dave G4AON wrote:
SDR where the authors compare a K3 with a HPSDR Mercury receiver and
explain why the SDR sounds better than the K3 (noise through a crystal
filter causing phase changes).
The K3 is also an SDR!
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Emails are not formal business letters, whatever businesses
use
the standard SSB setup, FL3 and FL4 settings on SSB do not use the SSB
module for receive.
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measurements be relative to the same
reference, not that the absolute value of that reference be known. 3dB
always represents the same ratio.
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The Elecraft list is a forum for the discussion of topics related to
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of the intellectual
property, losing ones own rights in it.
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, as this is technique
commonly used by 419 scammers. When they do it, the cheque will
eventually bounce, but the payment you have made will turn out to be
unrecoverable.
I believe that cheques can still be dishonoured, even after being
initially cleared.
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The Elecraft list
, it is a germanium point contact diode. (Schottky signal diodes
are almost as good, and I believe that is what is actually used in some
of the more recent Elecraft designs.)
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David Woolley
The Elecraft list is a forum for the discussion of topics related to
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and corresponding jump of the reference oscillator
frequency to the other extreme.
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.
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in the software defined part of the system.
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.
Violating the power management assumptions may also violate the thermal
management assumptions and result in either overheating, or the the
procesor throttling back, to protect itself.
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The Elecraft list is a forum for the discussion of topics related to
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applications.
LED's also use switching ballasts.
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
--
David Woolley
purity
specifications much outside the ham bands, so one would need to measure
the purity on the actual operating frequencies and, possibly, add extra
filtering.
/div
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address
ones, however, are stilled used for aviation purposes.
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gain calibration measurements that are accurate
and cover all possible factors that affect gain.
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in a linear way.
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kits on add ons because I don't
know the shipping cost (I'm also waiting for the customs exemption
limits to rise).
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, but it is unlikely to perform
well for data modes when operating close to the noise floor and it may
well not work well for very noisy speech.
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in imagining a mechanism that would cause that.
would be greatly appreciated. Everything else appears normal. I've
checked all solder connections on the SSB board several times and
re-flowed the connections I considered suspect.
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David Woolley (E.L) wrote:
div class=moz-text-flowed style=font-family: -moz-fixedTom Wylie
wrote:
Is it possible to get noise reduction working when in Data mode like
RTTY?
How would data reduction work in such modes and, more importantly, why
are those techniques not already being used
of getting rid of interfering carriers is to use a narrow
passband, either at IF, or in the terminal unit and the best way of
mitigating random noise is by using a discriminator that is well matched
to the desired modulation.
Tom
GM4FDM
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1mHz
(m used correctly).
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work
is.
You can have it both ways, but in my view, MIME digest is the only
sensible way with modern email clients.
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cards is to have electret bias fed,
via a resistor to the ring. Dynamic microphones normally use mono
plugs, which short the bias. Electret ones normally connect ring and
tip, and phantom feed the power to the element.
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The Elecraft list is a forum for the discussion of topics
would need an awful lot of third harmonic to shift much
from flute to string.)
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that tradesmen treat them as consumables.)
You get a similar problem with ISPs. The reason that they tend to use
overseas call centres which tell you to re-install Windows is that that
is all you can afford to do at the prices that customers are prepared to
pay.
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propagation and are generally considered
desirable in the amateur radio community.
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the square of frequency and ERP for a given amount of real estate
and input power increases with frequency. There may also be ionospheric
and surface reflection effects.
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by the digital filters should be
exact mirror images of each other around the carrier frequency, so any
difference has to be introduced by the roofing filter, or, less likely,
by any LC filters in the chain.
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The Elecraft list is a forum for the discussion of topics related
.
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Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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internally before they are released as a beta to owners. There is a
That's the definition of an alpha test. However, I understand that they
do also run a true beta test, by using a small number of external users.
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The Elecraft list is a forum for the discussion of topics related
talking about 384kB/s or 375KB/s.
If you do it after a roofing filter, you need to sample at a rate
equivalent to the bandwidth about half way down the filter skirts. In
practice, the K3 roofing filters are all too narrow to get useful
panning post filter.
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at the
antenna end. That's probably the only case in which they would work
well. (Given that good balanced feeders are rather more than 200 ohms
(although twisted pair is less), 4:1 is a compromise between easy
engineering and optimum match.
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