read my tutorial and liked
it a lot. If you haven't been there, his website is well worth the visit. It
includes several chapters from his book Reflections. They are excellent.
73,
Jim Brown K9YC
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73,
Jim Brown K9YC
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, two reversible Beverages, and a noise
level that rarely hits S3.
73,
Jim Brown K9YC
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On Mon, 3 Sep 2007 23:25:44 -0400, Dave Van Wallaghen wrote:
Now to see if I can get a room with a window that opens :-)
You'll have the best luck on this in an old fashioned hotel as
opposed to a newer one.
73,
Jim K9YC
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kHz, and should be
rolled off around 250-400 Hz on the low end.
73,
Jim Brown K9YC
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by winding the coax
around suitable ferrite cores.
http://audiosystemsgroup.com/RFI-Ham.pdf
See the section on transmitting chokes and the Choke Cookbook.
73,
Jim Brown K9YC
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You must
On Fri, 28 Sep 2007 05:57:34 -0700, Darwin, Keith wrote:
Those are my thoughts. What are yours?
The best band for DXing is the one on which you can put up the
most effective antennas compared to other hams who want to work
that DX. 30M is a very nice band because of the 200W power
limitation
good advice.
Jim Brown K9YC
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without saturation or overheating).
Jim Brown K9YC
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73,
Jim Brown K9YC
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for running power on 160 is to
get over the high noise levels. I've got an S1 noise level most of
the time. It's not uncommon for me to read a guy 579, but he can't
read me, because his noise level is S8.
73,
Jim Brown K9YC
Santa Cruz, CA
on
1810, often on 1820, 1830, and 1840. Most of the time they're down
around S3, but not always. And the guys around Fresno are struggling
with an intermod product that used to be 30 dB over 9, but last I
heard, is now down around S6.
73,
Jim Brown K9YC
moved from Chicago to the side of a mountain near Santa Cruz
last spring, I took down the antenna and re-installed it at my new
qth. I started with about 25 radials, adding more as I have time
(and find the copper), and I now have 40. No surprise -- the antenna
works even better here. :)
73,
Jim
not back on the air on
VHF yet.
The XV144 and XV220 are essentially the same unit, but with the RF
design optimized for different bands.
73,
Jim Brown K9YC
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of current from the radio to run the
capsule and it's FET output stage).
73,
Jim Brown K9YC
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supplies.
It's a very effective poor man's UPS. You simply need to to size the
supply so that it doesn't overcharge the battery.
73,
Jim Brown K9YC
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73,
Jim Brown K9YC
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your transmitting antenna (also known as RF feedback, or RF in
the shack).
73,
Jim Brown K9YC
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for each signal circuit. No changes to the wiring
between a KPA100 and a K2. Details on my website for the
serial connection.
http://audiosystemsgroup.com/RFI-Ham.pdf
73,
Jim Brown K9YC
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You
to cooperate with
them until I figured this out. Now, I refuse to talk to them unless
I'm also getting paid VERY well.
There's a broad sample of my writing at
http://audiosystemsgroup.com/publish
Jim Brown K9YC
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with
wide spaced turns is HUGE.
For example, five CLOSE-spaced turns of RG8 through five #31 toroids
will cause a resonance (and peak performance) in the 2-3 MHz range,
while WIDE-spaced turns will yield excellent performance all the way up
to 10 meters.
73,
Jim Brown K9YC
generator, you will find that it's close to 6dB/S-unit around S9, but
close to 3 dB/S-unit when you get below S6 or S7. And I'm not talking
about junk receivers -- I've done this with some very good radios,
like TS850's and FT1000MP's. No, I haven't done it with my K2's.
Someday.
73,
Jim Brown K9YC
world headquarters!
73,
Jim Brown K9YC
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a setting on the order of
3%.
Thanks for the slow curve over the middle of the plate, Bill.
Jim Brown K9YC
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(plain, ordinary, copper).
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On Mon, 5 Jun 2006 21:08:46 +1000, David Douglass wrote:
I managed to work VI9NI
with my basic K2, loading my short 80m vertical antenna.
That guy has great ears -- I worked him last night on 40, and
heard him working a bunch of guys quite efficiently. He also QSYed
down to 80 for some guys
with these boxes to find a connection that meant
anything.
73,
Jim Brown K9YC
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On Fri, 14 Jul 2006 20:39:42 +1000, [EMAIL PROTECTED] wrote:
I currently use a bulky head-set and was looking at something a
bit smaller for the trip. I've seen the Heil Traveller head-sets
and wonder if anyone is using one of these with the K2.
I've always viewed Heil products as vastly
quite well.
73,
Jim Brown K9YC
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On Mon, 31 May 2010 18:59:20 -0400, Tom W8JI wrote:
After making dozens of measurements here, I concluded the
major problems I had were from antennas coupling to antennas
(even at 1000 foot spacing) and how connectors were mounted
on radios and amplifiers, and things like BNC and phono
On Mon, 31 May 2010 21:50:34 -0400, Don Wilhelm wrote:
I believe the key word here is psychoacoustics.
Well, we're a bit off topic here, but psychoacoustics is a
very mature science that studies how humans hear and perceive
sound. I'm a member of the Acoustical Society of America, and
that
On Mon, 31 May 2010 22:38:30 -0400, Bill Tippett wrote:
In 1994 he unveiled the Bose
Auditioner program, a software tool that allows acoustic engineers to
hear precisely what a proposed audio system will sound like from any
seat in a large venue even before building construction begins.
On the
On Mon, 31 May 2010 21:00:32 -0400, Tom W8JI wrote:
Something else was going on Jim. Not shielding.
In short,
the antenna used on the analyzer has increasing
sensitivity for a given flux level with frequency.
Agreed. But there's more -- my amp, a Titan 425, has an L network
output, and
On Sun, 06 Jun 2010 15:13:57 -0400, Pete Smith wrote:
Is there any diagnostic that can be performed in the K3 to determine if
in fact something's blown on the KIO3 board?
Pete,
One of the things that lightning create errors in or modify digital memory.
One thing I would try is going into the
On Sun, 13 Jun 2010 11:21:49 -0400, Joe Subich, W4TV wrote:
The info below is only partially correct. WBBM-TV has a CP
(construction permit) to move to Channel 12. WKYC-TV has a CP to
move to Channel 17. Both chose to move to avoid impulse noise that
is present on the low-band VHF channels,
On Thu, 17 Jun 2010 15:55:30 -0500, Robert Mitilieri wrote:
whether I should invest in another adapter cable.
Own a soldering iron? Why not (gasp!) MAKE an adapter cable?
73, Jim K9YC
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good. I needed one when I lived in Chicago, and the two that I own
measure fairly well. If you buy one, DO check it for proper tuning -- I've seen
significant QC problems with several filters I've bought directly from ICE.
73, Jim Brown K9YC
On Mon, 21 Jun 2010 13:02:20 -0400, John Ragle wrote:
If so, I would be much more interested in a good low-noise GaAsFET
antenna-mounted (weatherproof) preamp with T/R switching
That would be ARR. I have one. It works well, BUT -- I had to send
it back three times because the GasFET blew due
Check out
http://audiosystemsgroup.com/Coax-Stubs.pdf
100 ft of almost any decent RG8-size or RG11-size coax is just fine for a
Field Day antenna on the HF bands. On the lower HF bands, RG8X-size coax is
just fine.
73, Jim K9YC
, use something like 56 or 68 ohms across the RX antenna,
470 ohms in series, and 47 ohms across the RX antenna input.
Resistor values are not critical, but keep leads short and don't use
wire wound resistors. :)
73, Jim Brown K9YC
On Thu, 24 Jun 2010 11:52:46 -0800, Edward R Cole wrote:
Running both preamps probably only raises the noise level and
does not improve receiver sensitivity in any significant
manner.
I suggest that you defer judgment on this until you're trying to
copy very weak signals during a band
On Thu, 24 Jun 2010 23:15:52 -0800, Edward R Cole wrote:
Then you state that you are not suggesting the ARR is better. Not
better than what?
The Elecraft 6M preamp
73, Jim K9YC
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CM500 is a winner, under $50.
73, Jim Brown K9YC
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On Sat, 26 Jun 2010 06:06:55 -0700 (PDT), NZ0T wrote:
We had one guy get on 75 with a KW
A KW on Field Day? What's this world coming to? FD is a low power event. High
power is like a you know what in the punchbowl.
73, Jim K9YC
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are complaining. :)
73, Jim Brown K9YC
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On Mon, 28 Jun 2010 09:13:21 -0400, Don Wilhelm wrote:
I have never had any problem with them, and I use them on all my DC
connections.
Same here. I LOVE the Power Pole connectors, and use them extensively.
I've broken all of my various DC power leads to insert them so that I
can mix and
impedances of the front panel and the rear
panel jacks
Look at the schematic diagrams, which are on the website. It's obvious.
and do they vary between modes?
No.
73, Jim Brown K9YC
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something simple, like mis-wiring of the mic connector.
Pin-out is documented in the manual.
73, Jim Brown K9YC
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On Tue, 29 Jun 2010 10:33:29 +0200, Maarten van Rossum wrote:
Don't be scared to crank up the mic gain and compression setting, Only if
you set them to the extremes you will cause trouble on the bands,
The instructions in the K3 manual are quite clear, and give great results. To
set them most
place to buy them is Full Compass, in Madison, WI.
73, Jim Brown K9YC
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On Mon, 5 Jul 2010 08:29:08 -0700 (PDT), Ken McGuire wrote:
I was frustrated at how slow the chats were on SSB (FM was even worse) -
it seemed like they were wasting a perfectly good band opening ragchewing
Yep. Same here. Often, an opening on any given path may be there only long
enough to
On Sun, 4 Jul 2010 19:34:18 -0500, Jim McDonald wrote:
My K3 was one of the lightning casualties they (Ren‚) just fixed.
Add me to that list. It took two trips and a lot of Rene's bench time, but
the radio is working fine six months later.
73, Jim K9YC
are generated and used.
Bottom line -- it is a REALLY BAD IDEA to sum the output of both
receivers into the same channel! It is a REALLY GOOD IDEA to put one RX
in one ear and the other RX in the other, allowing the brain to combine
them.
73, Jim Brown K9YC
On Mon, 5 Jul 2010 11:26:40 -0700, David Yarnes wrote:
However, I find myself
on both sides of the fence. Sometimes I get antsy wanting
to work a particular grid square, but other times I get into
a longer exchange
First, there's no fence. Do what you wanna. :) But do what makes
sense in
On Tue, 6 Jul 2010 09:53:44 -0400, David leDuc wrote:
I am wondering what kind of antennas you are using? I am
using a 3 element SteppIr and am in FN42
About a year ago, I put a 3-el SteppIR with 6M element on a tower.
Before that I worked a lot of 6M DX with my K3 by loading my 40M
dipole.
on the time
and frequency. It is the relation of the time and frequency to phase
shift that produces the ROTATION that several guys have talked about.
That's the swimmy sound you hear in the headphones in diversity mode
with widely separated antennas.
73, Jim Brown K9YC
on that wiring,
and by building a serial cable according to the instructions in my RFI
tutorial. http://audiosystemsgroup.com/RFI-Ham.pdf For the serial cable, see
the Chapter on Solving Problems in the Shack.
The only solutions for #1 are replacing the computer or the bucket treatment.
73, Jim Brown
On Fri, 9 Jul 2010 20:47:36 -0400, Tom W8JI wrote:
It will sound great if you add a J310 or similar JFET source follower.
Hams spend WAY too much time hand-wringing about impedance matching in
audio circuits. Audio circuits have not been impedance matched for
nearly 50 years! As long as the
On Mon, 12 Jul 2010 10:22:06 -0400, Bill NY9H wrote:
I'd think that way to go would be to put a $ .50 electret capsule or
It worked for Bob Heil!
73, Jim K9YC
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On Wed, 14 Jul 2010 09:06:04 -0400, Guy Olinger K2AV wrote:
You might consider that it's not a contesting bandwidth, more a
pleasant casual operating bandwidth. And in casual conditions my SSB
1.8 roofing filter with DSP set to 750 does as well, which I do. It's
only in contests that I get a 35
Hz
filter to switch at 500 Hz by telling the K3 that it is a 500 Hz filter. Some
very good operators do that and like it.
73, Jim Brown K9YC
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On Wed, 14 Jul 2010 14:12:45 -0300, Jorge Diez - CX6VM wrote:
So now I have another question, I think I have room for only one more
filter, so how will affect DIVERSITY if I have 250Hz, 400Hz, 1.8kHz in MAIN
and 400Hz, 1.8kHz in SUB?
I cannot do DIVERSITY with a 250Hz narrow filters (because I
On Wed, 14 Jul 2010 11:19:14 -0700, Dave Hachadorian wrote:
he link below shows which radios were used by WRTC participants.
There was certainly a preponderance of K3's.
Yes, but there is (at least) one very interesting side story that I
learned by watching the online video of the closing
On Wed, 14 Jul 2010 23:03:06 -0400, Lu Romero wrote:
But they both showed up with K3's. So did most of the
competitors!
Why?
Two very simple reasons. 1) Anyone who has used one in a multi-
transmitter environment, or in a major contest, knows that the K3
has the best behaviour of any
I always go under the assumption that if one guy wants to know
something, several other list members do too. The only times I
respond off list are when I am reasonably sure that no one but the
person asking the question cares about the answer, or when the
exchange needs to get very detailed to
On Thu, 15 Jul 2010 14:53:10 +0100, Ian White GM3SEK wrote:
Agreed. 250-270Hz would be the sweet spot for an 8-pole filter, to
guarantee good sales for the manufacturer *and* good performance for a
range of users in heavy QRM.
Now let's see if Inrad or Elecraft take the bait :-)
Hang on a
On Thu, 15 Jul 2010 11:47:53 -0700, Phil Kane wrote:
$1100 plus! My K2 cost just a few bucks more than that.
If you want really good in-ear earphones, look at offerings by Etymotic
Research and Shure. Both are widely used by professionals.
http://www.etymotic.com/ephp/er4.aspx
for Inrad to lean on their filter supplier
and get them to ship 250 Hz filters. Failing that, I want my
money back for three filters. BTW -- all of these were purchased
from Inrad, not Elecraft.
73, Jim Brown K9YC
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On Thu, 15 Jul 2010 21:32:08 -0400, Steve Ellington wrote:
Is anyone using full time battery power and trickle charging?
Sure -- since about 2004, I've run all the gear in my shack from a big
12V deep discharge battery that is float-charged by a $10 dollar no-
name supply that I bought at a
On Fri, 16 Jul 2010 14:38:24 -0400, Guy Olinger K2AV wrote:
Each to his own, just don't start a ban the 250 campaign.
Both you and Ed raise good points. No intent there -- I agree that
the so-called 250 Hz filter is slightly more useful than the 400
Hz. My real objective is to get Inrad to
On Sat, 17 Jul 2010 08:32:24 -0700, Vic K2VCO wrote:
I think a lot has to do with the antenna, and how it's connected to the rig.
If you are
using a balanced antenna, properly fed with coax and a balun or two-wire line
with a
well-balanced tuner, it's unlikely that you will have a problem. If
and narrow measurements on the
same page are the same data, plotted to different scale -- the narrow plots
to show filter bandwidth, the wide plots to show behavior well down the
slope of the filter curve. The dynamic range of the measurement is at least
75dB.
73, Jim Brown K9YC
does nothing does nothing wrong.
73, Jim Brown K9YC
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, Jim Brown K9YC
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On Sun, 18 Jul 2010 16:33:40 -0400, Joe Subich, W4TV wrote:
I don't know that benefit is necessarily the correct word to use
ton describe cascading. The better term would be effect. The K3
still exhibits benefits from the distributed filter design - the
roofing filter protects the 2nd IF and
are switching power supplies.
Many of them are quite noisy.
73, Jim Brown K9YC
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On Mon, 19 Jul 2010 11:31:42 -0400, Joe Subich, W4TV wrote:
The winners were all local (UA3, ES, LY) teams who
made fewer QSOs but took advantage of their knowledge of local
propagation to find a significantly greater number of multipliers.
I'm told that non-Russian speakers were severely QRMed
It should not be true, but whoever told you that appears not to understand
lightning and bonding. Study what W8JI, W4TV, Jim Lux, and I have written
about grounding. If you do that, you should not have a problem.
73, Jim Brown K9YC
On Mon, 19 Jul 2010 21:02:34 -0500, Bud Morin wrote:
I hope
On Tue, 20 Jul 2010 07:48:24 -0400, Tom W8JI wrote:
MOV's might not help or might not be
*useful* on all lines, but adding them would certainly not hurt
anything.
The issue with MOVs and other shunt mode suppressors is that they divert
the strike into whatever ground they are connected to.
, and Pin 1
problems are excited by shield current. That shield current results in
hum, buzz, and RFI (RF in the shack). When you bond the chassis of
equipment together, you virtually eliminate shield current.
73, Jim Brown K9YC
analyzer that I used to measure it.
73, Jim Brown K9YC
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a lot about common
mode chokes. :)
http://audiosystemsgroup.com/RFI-Ham.pdf
73, Jim Brown K9YC
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On Fri, 23 Jul 2010 10:37:46 -0700, Jay wrote:
The local AM station on 940 is wiping out my K3 on 1880 and 3760 to the
tune of 20-30db over.
I'd bet that you have preamp on and the attenuator off, so you're probably
overloading the K3. Turn on the attenuator and turn off the preamp. That
On Sat, 24 Jul 2010 11:13:22 -0700 (PDT), ab2tc wrote:
Where should I look for a top quality connector?
I've converted all of my DC wiring to Power Poles, so I've put
together more than a hundred of these connectors. There are three
sizes of pins that fit the red and black shells used by
cores plus some wire and
connectors).
73, Jim Brown K9YC
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On Fri, 30 Jul 2010 19:35:50 -0700, Brett Howard wrote:
Where be your tutorial?
http://audiosystemsgroup.com/RFI-Ham.pdf
I've got a couple 4 #2 cores
Cores are NOT mix and match. It took me YEARS to find this particular sweet
spot. If you want a decent balun, you must either follow the
On Sun, 1 Aug 2010 18:55:03 -0700 (PDT), ussv dharma wrote:
What suggestions do you have for me to construct for antennas?
Hi Susan,
The first, second, and third things you should do is study what George,
AA7JV, and Tomi (HA7RY) have done on their 2-person DXpeditions to small,
rare islands.
On Tue, 3 Aug 2010 12:28:54 -0400, Tommy Alderman wrote:
It was working just fine right after I reset the
RS242 to the correct (19200 b) baud rate; then I updated to the beta 4.03
firmware and now it does not talk to N1MM again.
That's the problem. You must set BOTH the K3 and N1MM to the SAME
On Wed, 4 Aug 2010 05:46:45 -, Ken Kopp wrote:
How does it
compare to Visalia in attendance? Visalia
definitely pays for us from an order perspective.
I would expect Visalia to be pretty good for you. Attendance is
perhaps a bit less, but still quite good, display space is
reasonable,
On Wed, 04 Aug 2010 07:58:07 -0700, Jim Brown wrote:
I would expect Visalia
I mean Paciifcon. :)
Jim
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On Wed, 04 Aug 2010 15:54:42 -0700, Lyle Johnson wrote:
MON is just Tx. For my CM500 I have RP.L BIAS for mic setting, gain is
10. FOr my voice, CMP14 is about right.
The CM500 IS hot. I've never noticed, or had complaints, of any background
noise. I also run it into the rear panel. Make
On Fri, 6 Aug 2010 14:51:46 -0700 (PDT), ussv dharma wrote:
Gosh, I wish there were cw activity out here in KH6 land...I listen every
day and at different times
Don't just sit there listening, call CQ. 20, 30 and 40 are all great CW
bands, and it's pretty easy to rig a simple antenna that
On Fri, 6 Aug 2010 19:57:20 -0700 (PDT), Al Lorona wrote:
Can it be connected backwards
A MUCH better question is, EXACTLY WHAT ARE YOU TRYING TO ACCOMPLISH?
73, Jim K9YC
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On Mon, 9 Aug 2010 11:07:13 -0400 (EDT), k...@aol.com wrote:
How about a Big Box K3?
So it won't fit under my airline seat? So that I have to buy a flight
case for it so that I can ship it? So that it takes up twice as much
space on my operating desk, which is already overloaded? Gee, that
I own two K3s that I bought nearly 2 years ago. Partly because I was a K2
owner, I found the user interface quite easy to learn. I'm a member of a
big contest club, and many of my friends have also bought a K3. With each,
there is a learning curve. Those who RTFM learn quickly. Those who don't
). And IMPROPER bonding, or
missing bonding, is a common CAUSE of lightning damage. This is especially
true when shunt mode protection is in use (MOVs, for example).
73, Jim Brown K9YC
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On Fri, 13 Aug 2010 11:08:04 +0100, Ian White GM3SEK wrote:
The other important point is that fuses provide ZERO protection until
AFTER they have blown. In the life and death of a semiconductor, even a
few milliseconds is a very long time indeed.
Yes. On the other hand, boards are all
On Sun, 15 Aug 2010 10:45:53 -0400, k...@aol.com wrote:
Is this expected behavior?
Yes, it appears to be within the normal tolerance of the filters. I have a
total of three 400 Hz filters and three 250 Hz filters between two radios
(one with a sub-RX). I've measured them all with a spectrum
With permission of the author, I posted the final version of his program on
my website. It's a free download. No, I don't know the version number. I
offer NO SUPPORT. The author offers NO SUPPORT. I'm just being a nice guy. :)
http://audiosystemsgroup.com/spectrogram.exe
73, Jim K9YC
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