could have
serious radiation problems (depending on feeder length).
--
David Woolley
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Jim Brown wrote:
On Fri, 15 Aug 2008 08:04:31 +0100, David Woolley (E.L) wrote:
Condenser microphones, that were historically used as broadcast
microphones,
Condenser mics have historically been used for MUSIC, both
recording and broadcast (and they still are). Most broadcasters use
as a marketing ploy.
With all betas, you should only become a beta tester if you are prepared
to provide detailed feedback on any failings.
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their field from the electret. Electret bias voltages are far too
small to be used directly to provide the field in the microphone.
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the diode
is series or parallel. To get true RMS, you either have to assume a
sine wave, and use a voltage divider, or you need to integrate the
square of the instantaneous voltage, by using thermal effects, using
square law detectors, or by integrating digitally.
--
David Woolley
The Elecraft list
:
- Use Firefox
- Obtain an FTP program (there are a number of them out there, including
Core FTP).
Windows comes with a usable command line ftp program.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham
on the SSB card,
not the variable width filter on the main board. The specification for
that is in the manual for the SSB option, although it varies with the
vintage of the K2.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general
the copyright
owner to do so. (I believe that permission to print a single copy for
personal use does exist.)
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there is whether or not it could
cause serious injury. Batton rounds, with less than 4 times the muzzle
energy have killed people, e.g. recently during a firearms training
exercise in the UK.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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. This is not
perfect, because the attenuation will include dissipation in the
dielectric and the shield, which might be closer to the surface and
therefore dissipate more easily.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics
limb. The
throw bags are tough bags filled with around 12oz of ball bearings and
the slick link is typically a 5mm rope made from slippery plastic.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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2
additions per sample, whereas the FIR style one requires n.)
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wasn't reproducible and could
not be rescued by production engineering.
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is slightly off, you can work out how much
to over/under-correct, and therefore considerably reduce the number of
iterations. It's sufficiently long since I did this that I cannot
remember the exact details.
--
David Woolley
Emails are not formal business letters, whatever businesses may
Steve Kallal wrote:
For example, early SSB rigs used a balanced modulator that nulled the
carrier. Then a filter selected LSB or USB. I think true SDR would do
that entirely in software. How does the K3 generate SSB?
In software.
--
David Woolley
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anything useful
in terms of radiated RFI.
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be introducing
significant distortion.
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, as it
might be something other than a spam filter, and even if it is, they
might indicate which filter rules are causing problems.
qth.net is probably well enough known to BTInternet, that they mark it
as a safe sender.
--
David Woolley
Emails are not formal business letters, whatever
that is the standard for dates in XML schemas.
It also manages to represent a single, rather complex microformat, as
though it were two different ones. In my view, that second case should
have been structured with XML.
--
David Woolley
The Elecraft list is a forum for the discussion of topics
unbalanced first local oscillator at 15kHz offset.
Again, it may be far enough down the skirts not to be too much of a
problem. (However the suppression requirements are much higher than for
an SSB carrier.)
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft
at the
input.
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Don Wilhelm wrote:
The 'without issue' part is important here. While it could possibly
work, to work with spurs and other 'bad things happening' is not likely.
Did you, instead, really mean without spurs... here?
--
David Woolley
The Elecraft list is a forum for the discussion of topics
with 5kHz channels; why
would 1kHz steps be useful?
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, there are advantages in having a more directly
connected serial card, e.g.
- you will need it for accurate time synchronisation to a hardware clock;
- you will need it for certain sorts of, timing critical, simple
hardware interfaces, such as PIC programmers.
--
David Woolley
The Elecraft list
Alan Bloom wrote:
Outside of ITU Region 2 (the Americas) 9 kHz channel spacing is used on
the AM band.
Which is medium and long wave, not short wave. (I remember when the
200kHz standard frequency became 998kHz!)
--
David Woolley
Emails are not formal business letters, whatever businesses
seem to
be infomercials, as the RSGB shop then (acting as an order taking agent)
sells the products at a discount.)
--
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
understand it, the difficulty is not in feeding the IF into a
Softrock, but in preventing the Softrock feeding its local oscillator
into the K3 and compromising that's performance.
Incidentally, the K3 *is* an SDR!
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
that it only caused a tingle. Only
with the serial cables engaged was it actually grounded, and inserting
the cable risked doing the initial grounding through a signal lead.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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to recalibrate the filters, as your 4MHz may have been wrong.
Normally you only need to move them up one notch and then back down,
so that the firmware senses a change and re-reads the frequency.
--
David Woolley
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receiver.
control board (Gary from Elecraft suggested this for me). This works great
and I now see 3.8V but it doesn't really make much of an audible difference.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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.
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.
--
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of the phasing
design (although note that I am not an ESSB believer). (They might just
be third method, but that is still a phasing design.)
--
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
units may achieve that shape factor by going flat to a higher
frequency and then cutting off much more sharply.
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of the
previous output with (1 - that proportion) times the current input.
A simple FIR filter would be a rolling average, where you average the
last n samples. Note that this requires n calculations, whereas the
exponential average only requires a couple.
--
David Woolley
The Elecraft list
, that
would indicate that the originals really were damaged, or at least some
of them where. If its still didn't work, that would indicate that the
originals were probably OK.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general
. The advantage of
the parallel port is that you can set a pin to +5 V to power your paddle
input circuit.)
As it's not a priority, you wouldn't expect many choices. However,
stealing supply voltages from RS232C outputs is no problem.
--
David Woolley
The Elecraft list is a forum for the discussion
IF is that the synthesizer must cover a much larger range
relatively speaking, but it appears that the K3 synthesizer performs
admirably in spite of this challenge. The advantage of being able to offer
excellent filters at the 1st IF is undisputable.
--
David Woolley
The Elecraft list is a forum
), it seems to me that it
is on topic, and some people find the most interesting thing about
mailing lists is what they learn from threads that are near the edge of
the charter (or drift off charter).
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
that should
work.
My impression was that that was the expected way of handling RTTY signals.
Transmitter circuits from 1968 simply switched between two oscillators
to key the signal; they didn't try to make a smooth transition in the
frequency domain.
--
David Woolley
Emails are not formal business
systems, like PSK, but I
would have thought it must be possible to train a filter off an
asynchronous signal as well, although one might have solve for the
signalling unit centre position after receiving the whole character.
--
David Woolley
The Elecraft list is a forum for the discussion
) or a near logarithmic scale, with rational frequency ratios
(natural (is this well tempered?) semitones).
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against a signal that is being 100% amplitude
modulated at about 10 to 30 baud (12 to 36 wpm). It gets quite
difficult to separate the amplitude modulation from the keying from that
from the beating.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
baud is normally sent with one stop bit. As noted
elsewhere, it is only really for mechanical devices that one needed
longer ones, so it tends to be 110 and below (maybe 300) that uses 2, or
for, 5 unit, Baudot, 1.5.
--
David Woolley
The Elecraft list is a forum for the discussion of topics
to
pay a couple of hundred bucks,
Mouser are claiming to have 9,170 in stock, for immediate delivery!
http://www.mouser.com/Search/ProductDetail.aspx?qs=A09egTk0tbXMpOf3uR8i2Q%3d%3d
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more
is bonded to
'ground', no potential (!) exists for electrocution. Until, that is, a ham
decides to ground his equipment 'properly' outside. Then large amounts of
current can potentially flow!
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm
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to protect against static during assembly of the K3 kit? Ground
the mat to a ground rod outside? Or to a metal gas pipe (for
grounding me, not as RF ground!)? There are no water pipes accessible
my build location.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
), a consumer SWL receiver with SSB
capability, does it and it has been common in mouse and trackball
drivers for three or so decades.
--
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
after the last band switch press. If the K3 doesn't
already do it, couldn't it defer sending any signals that would normally
cause external switching in the same way?
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here
built in, but that
will not be designed to provide adequate image rejecting and elimination
of other close in aliases.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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David Woolley (E.L) wrote:
This has already been covered, more than once. Without the filter, one
will get image responses at 30kHz less twice the DSP IF filter
Sorry, I meant twice the audio bandwidth. For AM it is the IF bandwidth.
bandwidth. You will also, probably, get aliasing
a filter at all is
not an option, becuause of the image response.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm
designed for wide bandwidths.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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___
Elecraft
to
10kHz, the adjacent channel will be an issue.
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David Woolley
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to have one antenna to do all bands, but
if not a separate wire for 80M is okay too.
--
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
stocking up on blank parts, in case the source is ever
opened.
Icom rigs (don't know about Kenwood). The paddle/key would be in
parallel with the microphone (so to speak). Hitting the paddle would
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
behaviour would
be an advantage.
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David Woolley
The Elecraft list is a forum for the discussion of topics related to
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, G3YIQ
___
**Need a new ride? Check out the largest site for U.S. used car
listings at AOL Autos.
(http://autos.aol.com/used?NCID=aolcmp0030002851)
--
David Woolley
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purity compliance, so you need
instrumentation that can actually measure spurious outputs, whereas,
when operating in band, the system is certified not to violate such limits.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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, the longer of the two
would dominate. Over a good ground, things get more complicated, and
I'm not sure I can give a good intuitive analysis.
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David Woolley
The Elecraft list is a forum for the discussion of topics related to
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List
to less than 5 volts.
I'd suggest the simplest approach is to use a resistor and an
opto-isolator, with a reverse diode across the isolator input, to avoid
reverse breakdown of the LED.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products
on people continually updating, and
one way of achieving this is to make sure that the copy is obsoleted
when the computer is obsoleted.
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David Woolley
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of the goods look low? For that
sort of reason, the UK tactic of considering shipping for commercial
transactions, and ignoring it for gifts, makes sense.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham
legislation, that duty and VAT are based on the
bottom line price, including shipping and insurance.
Shipping and insurance is not counted for gifts sent directly from one
individual to another, and the limit is GBP 36, rather than GBP 18, but
that is not relevant for a company.
--
David Woolley
of Windows drivers aren't really
drivers, but rather parameter files that tell the real driver that a
particular USB ID requires, for example, a USB serial driver.)
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics
.
[ Very long line re-wrapped ]
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm
.
The reset position is the last remembered one for the band and antenna,
so, if you last used the dummy load on the band and antenna, you would
not expect any activity, as the reflected power will already be low enough.
[ Single, very long line, paragraphs, re-wrapped. ]
--
David Woolley
for the Elecraft parts, but I think they are pretty much
commodity parts.
You may also find that Elecraft will supply them by letter post.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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List
Brett Howard wrote:
Well lets put it this way if you are in Europe and you buy an electronic
product its made with lead free solder unless its been on the shelf for
a good long while.
Or its intended for use in a server computer or as a network
infrastructure device.
--
David Woolley
hertz (w/o using XIT!) would be appreciated.
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have constant group delays (whereas symmetric
FIR ones do).
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The Elecraft list is a forum for the discussion of topics related to
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between the
main micro-controller and the display controller.
--
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
. Unfortunately, the codes for this
are not published. (There could be other reasons for a partial display,)
--
David Woolley
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can't be CE approved.
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David Woolley
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___
Elecraft
a real article and that one does have a character
that is in neither ASCII nor ISO 8859/1 (U+2122). This worked in both
the digest and the qth.net web interface, with my viewers and fonts.
(The ASCII encoding of ASCII characters is identical to the UTF-8
encoding of them.)
--
David Woolley
monitoring diodes
on the 100 watt PA. I believe they are 1N5711's. There are many
examples of this in the list archives. The K2 isn't EMP hardened!
Any ideas please?
[ Single line paragraphs have been wrapped and interparagraph
spacing added ]
--
David Woolley
The Elecraft list is a forum
the tone?
[ Single line paragraph re-wrapped. ]
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David Woolley
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memory.
--
David Woolley
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Post
variation from the IF filters).
If the decoder is good, it will have an adaptive filter that will
automatically equalise the signal for good digital decoding.
[ Single line paragraphs have been arbitrarily wrapped.]
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
) is.
That's basically the strategy used by telephone modems (except 56kbs
ones, which play tricks with the digitisation of the signal). The
faster ones use a carrier of about 1800Hz (nominal channel centre is
1850 Hz).
--
David Woolley
The Elecraft list is a forum for the discussion of topics related
antenna or feeder lentgh or maybe
adding/removing a piece of feeder on some bands? Are there
some proven length to use?
The G5RV was designed to have a relatively good match on all the
pre-WARC bands.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855
it under warranty, and doing so will get it formally recorded as a
quality failure.
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David Woolley
The Elecraft list is a forum for the discussion of topics related to
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closed
down.)
Doing this with a dynamic IP address is probably even more likely to
result in the mail being filtered.
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David Woolley
The Elecraft list is a forum for the discussion of topics related to
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.
Outlook is possibly a particular problem, as it can thread Usenet but
not email.
--
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
knowledge, to do quality control.
Governments also have a responsibility.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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Rick Kunath wrote:
David Woolley wrote:
Outlook is possibly a particular problem, as it can thread Usenet but
not email.
Outlook can thread email messages. It isn't set to do that by default
though. And most people don't have it set that way.
Many people use back versions of Outlook
, if mail is not getting through because it contains full URLs I
would suspect the real problem is a spam filter somewhere down the line,
as URLs in email are a spam indicator.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should
from the signal
path; i.e., operate only with the crystal filters.
The product detector (or FM discriminator) is implemented in the DSP
firmware, so, if you could bypass the DSP, you would have a signal at
the final IF frequency (15kHz?), not a baseband one.
--
David Woolley
The Elecraft list
for the difference is a post-sales one.
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suspect there are a
significant number of operators who are blind or partially sighted, and
would therefore benefit from screen readers or reflowed, enlarged text.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related
.
--
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is dominated by adjacent
spectral peaks.
In general, noisy signals are difficult to compress. Sound will show a
bias towards zero, so will be partially comprssible.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address
, noise reduction has to be more of an operator comfort thing
than really improving the signal. If the noise is so strong that you
cannot make out the speech, the noise reduction isn't going to be able
to find it anyway.
--
David Woolley
Emails are not formal business letters, whatever businesses
would prefer that
services not be provided for free on the basis of cheap amateur radio
licences.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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, they don't actually have
to be measured.
=
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filters that can be implemented in modern
fast DSPs, combined with the relatively fixed distortion the the receive
filters, cannot compensate for non-synchronous signals.
--
David Woolley
The Elecraft list is a forum for the discussion of topics related to
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, will have very
little bandwidth.
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List Guidelines http://www.elecraft.com/elecraft_list_guidelines.htm
Geoffrey Mackenzie-Kennedy wrote:
David Woolley wrote:
I am pretty sure that the birdy is a harmonic of the main
microcontroller instruction rate and is entering before the mixer.
I agree that this is one source, and one point of entry for this
signal.is K16 / K17.
Why do you say
of the
adjacent chips reduces the internal generated noise voltage at the
the chip interface - I'm not sure why people should be saying that
one should be specifically optimising for noise above the birdy.
--
David Woolley
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Elecraft
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