and CW, and you do NOT have
to remove the DSP to disable them.
On the other hand, once I have aligned the filters, I like to turn the DSP
filters back on and look at the combined response of the crystal filters and
the DSP filters when setting the DSP filters.
Jim Brown K9YC
On Wed, 16 Jun 2004 11:39:57 +0100, [EMAIL PROTECTED] wrote:
However, the real question is should I
visualise the letters (like imagining a typewriter with my eyes shut) or
just sort of recognise the letters in an abstract sort of way leaving the
brain to piece them together in the background so
. That's
only 70 dBSPL, which is only marginally loud enough in a noisy room (or if
you have a lot of hearing loss).
Jim Brown K9YC
http://audiosystemsgroup.com
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10 dB (3x the distance), and
extending
the life of my battery by letting me run QRP to work shorter distances.
Jim Brown K9YC
On Fri, 18 Jun 2004 15:51:05 -0700, Leigh L. Klotz, Jr. wrote:
I just bought 20-023 BNC window clip-on miunt with 6ft of RG-174 for
$1.97 on clearance. They had
One of the two CW rigs at K9OR was my K2/100 with KAT100. That rig made 1072
QSO's.
We ran 100 watts for all of the contest, with the exception of the time it took
to make the five
QRP QSO's needed to qualify for the alternative power bonus. To do this, we
simply
disconnected the rig from
On Mon, 28 Jun 2004 16:16:52 -0400, Jerry wrote:
I was wondering what kind of antenna you were running?
The CW stations used all dipoles, average height about 30-35 ft. The phone
station had
a dipole for 80 and 40, and a monster Delta beam for 20/15/10. The SSB station
made
786 contacts,
On Tue, 29 Jun 2004 08:08:37 -0700, wayne burdick wrote:
What I usually do is put up at least two antennas
(typically, orthogonal long wires that favor N-S and E-W). You can
connect both to the KAT2 or KAT100 at the same time, since both ATUs
have dual antenna jacks. You can then quickly test
and a high (10K typical) input
impedance. Mic input
stages have a much lower input impedance (1K typical) to maximize signal to
noise.
Jim Brown K9YC
http:audiosystemsgroup.com
On Thu, 1 Jul 2004 19:44:45 EDT, [EMAIL PROTECTED] wrote:
When an input to, or output from an audio device
On Fri, 02 Jul 2004 06:29:33 -0400, Mike S wrote:
At 11:32 PM 7/1/2004, Jim Brown wrote...
BTW -- forget all that ancient stuff about 600 ohms. Pro audio hasn't used a
600 ohm
reference for at
least four decades.
That may perhaps be true for a limited range of pro audio applications,
but 600
of an
uncompressed audio waveform. Both ways of thinking/talking about it are
important, but you absolutely must understand the difference.
Jim Brown K9YC
http://audiosystemsgroup.com
--Original Message Text---
From: [EMAIL PROTECTED]
Date: Fri, 2 Jul 2004 07:30:49 EDT
600 ohms is still very much
on the order
of a
foot between insulators a transmission line is simply wrong.
Jim Brown
Audio Systems Group, Inc.
Chicago
http://audiosystemsgroup.com
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the IM that is produced. I haven't seen any
data for
a rig's IM vs. power output, and I haven't measured my rig, but I suspect they
are
correct. Many rigs, including the K2 and K2/100, are rated for 3 dB less power
on
100% duty cycle modes (RTTY, PSK, etc.) to prevent excessive dissipation.
Jim
in about 9 months. It also is pretty good in
some
directions on 30 meters. The 160/80/40 design is a scaled-up version of the
80/40
design for 160/80, with a parallel wire dipole for 40. It is installed at W6BX,
and works
VERY well.
Jim Brown K9YC
On Wed, 07 Jul 2004 11:32:48 +0200, Geert Jan de Groot wrote:
I never had a problem
I participate in two email lists devoted to folks who work in the pro audio
world.
There are more than a few stories of valuable, but harmless, tools being
confiscated from luggage that was subject to
On Wed, 7 Jul 2004 09:12:27 +0100, JA Crux wrote:
Interesting. It varies from place to place. I took my K2 to ZS6, on 12/11.
Yes. I took my FT100D through two airports last month (my K2/100 stays safe at
home).
No problems with security either place. At O'Hare, an inspector asked what it
are likely to have a similar problem and
be
interested in the answer. Another good reason for posting to the list is that
public
answers get the benefit of peer review, while private replies don't.
Jim Brown K9YC
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includes a KPA, but I don't think I need it. It has a key output to
drive power
amps, but there is no doc on it. Is it also a pre-delay signal (that is, 10-20
ms before
transmit)? What is its logic -- positive to transmit?
Jim Brown K9YC
I'm looking for a manual for this unit.
Jim K9YC
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of
a few dB in the overall BG noise level on 160. I didn't compare it on other
bands. Just to make sure it wasn't loss in the filter, I ran a response on the
filter with a calibrated generator and scope. It wasn't.
Jim Brown K9YC
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W8JI designed the unit and has written a very detailed alignment procedure that
is on his
website. A search on W8JI and MFJ259B will turn up a link.
As coincidence would have it, I found a 259B at a hamfest over the weekend and
plan to
use his instructions myself. They look good, but I
On Fri, 16 Jul 2004 13:04:07 -0400, Bob Schreibmaier wrote:
Personally, I've always liked the Rolling Stones
Without question, Count Basie, especially the one with Lester Young. In second
place is the mid-50's Kenton band.
Jim Brown K9YC
On Thu, 22 Jul 2004 13:18:37 -0700, Howard W. Ashcraft wrote:
Is the KDSP2 less effective for reducing unwanted noise on CW
No, the KDSP2 provides both a very effective variable bandwidth audio filter
(wonderful for both CW and SSB), and a very effective dynamic noise reducer
(also
very
times. The stuff he said in the 20's have been said by in their own way by the
likes of Lenny Bruce, Bill Cosby, or Jay Leno in their night club act -- but
not
on televison!.
Jim Brown K9YC
On Sun, 25 Jul 2004 11:24:48 -0500, [EMAIL PROTECTED] wrote:
Humorists do not make personal attacks
On Tue, 27 Jul 2004 09:35:15 EDT, [EMAIL PROTECTED] wrote:
I'm seriously thinking about buying as 5-band Hustler to ground mount behind
my shack. I've been told that my signal to noise ratio would improve
considerab
Congratulations on your upgrade and getting on the air. I seriously doubt
conductivity at the top of this
mountain.
At a riverside or beach location I might have been more inclined to use a
traditional vertical.
One of the other obvious advantages of a remote site is the absence of local
noise.
Jim Brown K9YC
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length -- even adding only a single radial for the lower frequency can help
loading on
that band. The general rule with radials and ground systems is that more is
better.
73,
Jim Brown K9YC
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On Mon, 2 Aug 2004 22:41:37 -, Robert McGwier wrote:
You cannot tell if it is a personal message or a group message easily.
Easy solution. Set the filter to look for [Elecraft] in the Subject or Header
(that is, include the brackets). My email software has been set that way
for as long as
On Mon, 02 Aug 2004 20:46:17 -0500, John Rader wrote:
125' EFHWA strung between.
These abbreviations drive me nuts! What the hell is an EFHWA?
Jim K9YC
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working the WAE contest and hearing a fair number of T6
signals. Dunno if it is on purpose or accidental. Some contesters/DXers seem
to want their signal to stand out, even if their tone stinks. I think they're
misguided,
but what do I know?
Jim Brown K9YC
On Sun, 15 Aug 2004 08:06:33 -0600, Indy wrote:
this tone question may not be the transmitter in many cases.
I heard on local stations that I am sure were ground wave and strong. I also
heard it on skip that was stable and VERY unlikely to have been
affected by auroral activity.
Jim
On Sun, 15 Aug 2004 19:25:18 -0700 (PDT), Art-W6KY wrote:
I had just worked a DL in the WAE contest with my K1-2 on 14052.
My K2 at 5 watts into dipoles made 158 Q's in 27 EU countries. Only worked
about 7 hours.
Could have done a lot better if there had been more EU stations and contries
fitting a low wattage resistor into a Switchcraft 1/8
plug.
It's trickier fitting it into the 8-pin plug used on the K2.
Jim Brown K9YC
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to work with a ham talkie. In essence, you have to do major
surgery on what is a very delicate (and cheap) switch with very tiny and
delicate wiring to either disable it or rewire it to work with a radio for
which
it was not intended. I bought one of these new at a hamfest. VERY bad
idea.
Jim
this
as a known
good element of the control chain. Use the default settings.
Writelog also works very well the K2 (but it isn't free).
Jim Brown K9YC
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configuration works VERY well for me on 80 and
160. To make this work, there can't be a balun at the antenna, because
this would disconnect the top section from the vertical section. So if and
when you use this dipole as a dipole, you need a balun between the tuner
and the feedline.
Jim Brown
have just as readily done it
with my Volvo.
Jim Brown K9YC
On Wed, 8 Sep 2004 18:03:18 +1200, Paul Saville wrote:
Thanks for the information Jim. I've had some copper clad up
for about 2 years and it's still working OK, but time will tell.
I was given a big roll of #8 solid copper a while ago
, but your rig would have made it even
easier.
Bravo!
Jim Brown K9YC
On Thu, 23 Sep 2004 09:07:30 -0400, Edward R. Breneiser wrote:
If you need a portable antenna take a look at:
http://www.wa3wsj.com
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I agree with all of Ron's advice in this excellent post. Antennas don't have to
be perfect to
work.
Jim
On Tue, 28 Sep 2004 16:51:16 -0700, Ron D'Eau Claire wrote:
The radiator/counterpoise arrangement eliminates any need for baluns, etc.
The counterpoise connects to the case of your rig,
of them
(at the
mic connector). Maybe I need to fix the one at the headphone connector too.
Any thoughts or experiences with any of this from the group?
Jim Brown K9YC
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You must
On Thu, 2 Dec 2004 09:17:06 -0800, Bob Tellefsen wrote:
Jim
Can you test your system into a dummy load instead of an antenna?
This would help determine whether it is truly rf feedback from the antenna
into the rig.
Good question, and yes, I did that test yesterday to try to eliminate the
.
Jim Brown K9YC
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an interference voltage to be developed across the board circuitry.
I sent Stewart a photo of what I did. I can send it to others, but I don't
think the list accepts
attachments.
Jim Brown K9YC
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in the lurch and you don't know why or how to fix it, as it did
you. With me, it has happened when the rig cooled off from sitting
next to my open window with a cold winter breeze blowing on it.
Jim Brown K9YC
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On Wed, 05 Jan 2005 14:43:45 -0800, Eric Swartz - WA6HHQ, Elecraft wrote:
The K2/100 already includes a high voltage output keying line for linear
amplifiers on its KPA100 back panel. It can handle up to 200V and 1A
max. Most amps with -positive- keying voltages can be T/R keyed from the
the amp is there is that you get more
responses to your CQ's, and the guys calling you are more often
closer to your noise level. :)
Jim Brown K9YC
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and display harmonic distortion vs. frequency, BY
HARMONIC ORDER!
Jim Brown K9YC
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This program suite is a winner, and it's FREE. The PSK software is
spectacular! I've been using it for more than a year.
Jim Brown K9YC
On Wed, 26 Jan 2005 11:44:59 -, michael stevenson wrote:
Have a look at Ham Radio Deluxe v3.1 Beta
I bought a k2/100 from someone on this list several months ago, and
shipped to my remote QTH in CA. Just got out here to play with it
last weekend. It works fine on 160, but on 40 (and probably other
bands, haven't had time to check) the tuning knob tunes makes the
frequency readout change but
On Mon, 31 Jan 2005 10:33:18 -0800, Ron D'Eau Claire wrote:
Re: Frequency readout. Assuming you aren't in SPLIT mode (in which case you
should see the xmit frequency on the K2 when you transmit), I'd run CAL PLL
and see how it behaves. If the firmware has been changed without doing that,
all
On Wed, 2 Feb 2005 18:02:43 +0100, Tom Arntzen wrote:
If the frequency counter cabel isn't connected to TP1 you will get
the info 232 message.
Thanks. It WAS connected from the counter to TP1.
Jim
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and as noise reduction, and I am very happy with both. I
have not used a K2 with a KAF2.
Jim Brown K9YC
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to troubleshoot got much worse after a few hours, and
I ran the rest of the contest at 100 watts.
Jim Brown K9YC
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the mfr and tell them to fix it.
Jim Brown K9YC
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helpful.
http://audiosystemsgroup.com/publish.htm
Jim Brown K9YC
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, identically equipped
(K2/100, KAT100, K160RX, KNB2, KDSP). I'm currently troubleshooting
an AGC problem in that radio, so it's apart on my bench and hasn't
been tested in this way. Any suggestions for getting it as clean as
possible?
Jim Brown K9YC
On Thu, 14 Apr 2005 12:22:52 -0400, Dan Barker wrote:
You don't describe the test setup in any detail,
I thought I did that rather well, but I'll repeat it. Radio to
mechanical switch to antenna, each using its own antenna tuner,
indicated match 1:1. HP8590D with short piece of wire attached.
Thanks for all the ideas, guys. I hope to get into the KPA100
tomorrow.
Jim
On Thu, 14 Apr 2005 14:58:46 -0700 (MST), Gary Hembree wrote:
Some additional thoughts on your problem.
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You
display is QUITE helpful, and is worth
the extra money over the MFJ.
If your interest is building, tuning, and tweaking antennas, the MFJ
is a lot of tool for the money. And none of those friends I've
mentioned have had problems with them, nor have I.
Jim Brown K9YC
in the ham world.
Jim Brown K9YC
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In preparation for the K60XV I just finished, I had to upgrade my
KPA100. It involved changing a few resistors, adding two jumpers, and
replacing the firmware. It's now shutting down when I go into tune
mode (with the KAT100). I smelled smoke, and R21 in the KAT100 shows
signs of overheating.
second harmonic generators. The normal setting of the
warmth control is at around 3-5%.
Jim Brown K9YC
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with this
discussion.
Thanks,
Jim Brown K9YC
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that lists time standard transmitters:
http://www.cl.cam.ac.uk/~mgk25/lf-clocks.html
Any further comments will be appreciated, but because this discussion is pretty
far off topic, please reply directly to me, not to the list.
Thanks again,
Jim Brown K9YC
supports K2, and is quite well
respected. I have not used it.
If you want to work contests, Writelog works quite well with the K2
serial interface.
Jim Brown K9YC
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to the
shell of the DB9 connectors at both ends (the computer end and the
K2 end), and NOT to pin 5. Before I made this change, my computer
would lock up at 10 watts. Now I can use the K2 drive my Titan at
1 kW with no problem.
Jim Brown K9YC
poor choices -- they compromise
efficiency for sound quality.
FWIW, I generally prefer to do my serious operating with
headphones, and every set of cans I've ever tried give me plenty
of level with the K2.
Jim Brown K9YC
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and Universal sell them, and I've seen them cheaper
elsewhere.
Jim Brown K9YC
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pair for pin 3, and one pair for pin 4.
2) Connect the shield to the shell of the DB9 on each end, NOT to
pin 5 of the DB9. I don't make any connection to the pin 5's -- I
connect signal returns to the shell of the DB9's too.
Jim Brown K9YC
.
Jim Brown K9YC
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,
and worked him after about a dozen calls.
Jim Brown K9YC
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Reprinted from the North Shore Radio Club EMail List.
Jim Brown
= = = = = = = = = =
K4FW, Albert R. Kahn, passed away on June 15th. Al started Ten-Tec
after being bored with retired life. He was also a member of FOC.
He had previously started the speaker/ mic company Electro
just
need to choose the right value of you have that kind of interference.
73,
Jim Brown K9YC
On Thu, 7 Jul 2005 14:49:55 -0400, W3FPR - Don Wilhelm wrote:
Adding to that grounding 'magical stuff', what I learned in large system
computer design and testing experience was that shields are only
The subject says it all. One of my K2's seems to have normal
sensitivity on all bands except 15m. The receiver is running, but
sensitivity is down by 20-30 dB. Any ideas about where to look? I'm
suspecting a bad T/R relay, or something around there.
Jim K9YC
On Tue, 23 Aug 2005 15:58:15 -0500, k4zm wrote:
RANT function
That was it! Thanks
Jim
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, and much of the higher
output voltage is lost.
And if anyone wants a copy of the data sheet, give me a FAX number and leave
your
machine on. It's four pages.
73,
Jim Brown K9YC
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On Sat, 27 Aug 2005 10:26:57 -0500, Jim Brown wrote:
The mods are quite simple. First, change R14 from 1K to 2K. Second,
change C34 to 0.22 uF. Third, add 2.2uF in series with R15.
A correction to one of my suggested mods by Don, W3FPR, who understands the K2
in far more detail than I do
On Sun, 28 Aug 2005 13:18:35 -0400, Francis Belliveau wrote:
I am now confused by the existence of two different mod's with the same
goal.
It makes perfect sense to me that I should not be wasting Tx energy on audio
frequencies as low as 20Hz. Beyond that I am somewhat in the dark.
Jim Brown
On Sun, 28 Aug 2005 12:59:40 -0700, Ron D'Eau Claire wrote:
Are you suggesting that those low frequencies are somehow being distorted
or causing other problems in the audio I.C. in the K2 before they get to
the filter?
Distorted no. Causing problems -- well, sort of. We don't transmit that LF
as the stray capacitance changes.
For all practical purposes, L does NOT change. C changes.
There's a lot more about this in an applications note on my website,
that also includes some references to the literature.
http://audiosystemsgroup.com/SAC0305Ferrites.pdf
Jim Brown K9YC
On Tue, 30 Aug 2005 09:18:57 -0700, Ron D'Eau Claire wrote:
The validity of the inductance measurement using this method is borne
out by noting that the inductance value reported
Yes, if the measurement is made at a sufficiently low frequency, Xc is
insignificantly low.
Jim
I disagree. I think you are probably observing the change in capacitance. I
agree that the higher frequency components associated with the square wave
rise time is the measurement excitation.
Jim
On Tue, 30 Aug 2005 10:00:23 -0700, Ron D'Eau Claire wrote:
Jim wrote:
Yes, if the measurement
complains that I shouldn't get in the way of their DX chasing
(and I'm not in the window).
Use it or lose it! Don't blame the FCC for CW inactivity -- it's US!
Jim Brown K9YC
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You must
On Mon, 5 Sep 2005 20:23:28 +1200, Nigel wrote:
3) Balun at the ant (?:1) plus RG213 to tuner
This is a good configuration if the antenna is long enough
to load on all the bands on which you want to use it. BUT,
with a feedline only 5m long, and a transmitter power of
only 100 watts, RG-213
doesn't depend on repeaters,
which could be down when they are most needed. Each station in an
emergency area could simply work directly to one or more assigned
partners outside the affected area, and that partner dumps the
traffic onto conventional channels (the internet, etc.).
Jim Brown K9YC
On Tue, 6 Sep 2005 12:36:04 -0700, EricJ wrote:
The riff raff was deeply entrenched on 75 before VEC
You can say that again -- 75 was a mess in the 50's!
Jim K9YC
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Clusters, and now logging. Because I was already
using and happy with DX Keeper, I haven't looked at HRD's logging, but I
would expect it to be good.
Both suites are freeware!
Jim Brown K9YC
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On Wed, 7 Sep 2005 22:12:47 -0700, Jack Brindle wrote:
So give Motorola a break.
No way. Hit them hard. If the in-house hams have sounded off and we
don't raise hell, they look bad. The Motorola comments were very
bad, and a strong reaction is in order.
Jim Brown K9YC
of money (FAR more than they're worth). The only real
value-add I've seen from Heil is the excellent physical construction of
their headset/boom mics. BUT -- we've experienced RFI problems at N6RO
with Heil headsets that have built-in electronics. :)
73,
Jim Brown K9YC
http
I agree, Brenden. You will find the same advice re inexpensive headsets and
ham gear in that RFI tutorial, the link to which I posted yesterday. That
tutorial includes generic instructions on how to connect them to your radio.
Several years ago, I bought four different models of Plantronics
to use WriteLog a lot, but switched to N1MM a year ago. I've seen
a note somewhere saying that you tell WriteLog that it's a K2 or a
Kenwood.
73,
Jim Brown K9YC
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On Tue, 27 May 2008 23:15:36 +0300 (EEST), LY2IJ wrote:
WPX was first contest with K3 for me too.
I still not sure if K3 is much better than my old IC-746
Huh? It's much nicer than the FT1000MP it replaced, which runs rings around
my 746. Only thing missing (over the MP) is the second RX.
Gotta pay for the K3, so I'm selling s/n 301, which I bought used
from the builder about three years ago. It's got the 100W PA in the
lid, KSB2, K160, KNB, KDSP2, and KAT100 (in the outboard box). Most
upgrades are installed, but lost track of details. Make Offer. Ship
to USA only, check or
41-45 in
http://audiosystemsgroup.com/HamInterfacing.pdf
Also, study Appendix 6 of
http://audiosystemsgroup.com/RFI-Ham.pdf
73,
Jim Brown K9YC
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of
conversations with a neighbor who has studied delay times of amp
keying relays. :) I can run it full QSK or with any form of semi-
QSK (that is, variable hold-in time for the TR relay).
73,
Jim Brown K9YC
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microphone measurements are
done in anechoic chambers.
I'm saving a copy of that graph to use in my lectures!
73,
Jim Brown K9YC
On Fri, 06 Jun 2008 17:30:42 -0500, Bill NY9H wrote:
nice chart
looks like the results are from a Bruel Kjaer.
But can you explain what sort of chamber
On Fri, 6 Jun 2008 21:22:41 -0400, Joe Subich, W4TV wrote:
There is a significant problem in using balanced input with any
amateur mic - including Icom, Kenwood, Yaesu and Heil. Yaesu,
Kenwood and Heil connect the shield of the mic cable to the mic
return and not chassis (ground). Icom uses
in the sand about it.
73,
Jim Brown K9YC
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cause of hum, buzz, and
RFI.
If the cable shield does not go straight to the chassis, it cannot function as
a
shield. If it has a long (inductive) path to the chassis, it provides a VERY
strong path for RFI into the box. See the tutorial on my website, cited in an
earlier email.
73,
Jim
shown in my AES paper on the topic, and,
indeed, it peaks on 15M and a bit above 75M. That paper is on my website.
Putting it simply, MANY ham rigs are built with pin 1 problems. That is,
they have a design flaw that causes hum, buzz, and RFI when we connect
cables to them.
73,
Jim Brown K9YC
#61 is the weapon of choice at cell
phone frequencies.
These coupling mechanisms are described in detail in a tutorial on my
website. It's a free pdf download, no cookies.
http://audiosystemsgroup.com/RFI-Ham.pdf
Jim Brown K9YC
Chair -- Technical Committee on EMC
Audio Engineering Society
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