I'm sure a major reason W8JI leaves everything connected is because it would
take him about 4 hours to disconnect it all! :^)
Jim, you have chosen to take the risk of leaving everything connected. Good for
you; it shows your confidence in your own engineering. But surely you'll agree
that it
Imagine that, somehow, you could know for certain that tonight you were going
to get direct-hit by lightning on your antenna.
In spite of all the grounding and bonding and spark-gapping and everything else
you may have done, are you confident enough that you would trust it all and let
the
I ran my K3 in diversity mode during the ARRL 160 meter contest for the first
time from this side of the country. It was a revelation. If you've never
listened in diversity, you must do everything you can-- now that we're in the
time of year that's favorable for the low bands-- to experience
Now and then, someone accuses the KAT500 of disturbing their impedance match
even when it is bypassed. I wanted to see just how much residual mismatch the
KAT500 has when it's in bypass mode, so I made a couple of measurements today.
I took measurements at 3.6, 7.1 and 28.3 MHz; in other
Here's a problem that I'm curious if anyone else can reproduce it. I'm running
K3 firmware 5.66.
If I spin the VFO B knob *really* fast in either direction, the radio shuts
down. (On rare occasions it will hang and require power supply shutdown to turn
it off.)
I highly doubt it, but just in
Wayne Burdick, N6KR, has taken the gold medal at the 1st annual Kitchen
Homebrew Challenge held over the weekend.
The contest challenged engineers to construct a QRP transmitter using just
three transistors and whatever else they could find in their kitchens. Although
the designers were
Hi, Everybody,
I greatly apologize for escalating the list traffic with my question on
lightning. I merely wanted to get your thoughts on disconnecting equipment in
addition to grounding and bonding. And the overwhelming consensus-- in both
public and private responses-- is that yes, in fact,
Please don't laugh at me; I'm a transplant from a region of the country with
essentially no lightning to a region where you have to worry about it quite a
bit.
We had a doozy of a storm last night, with lots of lightning overhead. I felt
like a sitting duck, even though I had grounded both
Wow. I can't even imagine working 1532 contacts in 24 hours. If, in fact, you
stayed awake for 24 hours straight, that would have meant you maintained a 64 Q
per hour rate for the duration. That's an incredible run for *any* contest.
Congratulations, sir!
Yeah, I let my frustration out on the
> I can hear many many stations but hardly any of them can hear me.
The most likely reason for this is operator inexperience, which is a perennial
problem on Field Day. It's great that lots of people who don't usually get on
the air, get on the air... but the side effect of this is a lot of
Kevin's perseverance is astonishing. Week after week, suffering through poor
conditions. He never seems to catch a break. So here is THE KD5ONS CW NET
REPORT I HOPE TO READ BEFORE I DIE.
"Signals were fantastic. There was no hint of noise nor QSB. At one point, I
laid the headphones down and
Yes, if you're willing to do the math in your head, or can set up your fancy
wattmeter to do the math for you, this'll work.
But the main reason why I don't like the idea of putting the wattmeter (or
sensor, actually) in a non-50-ohm location is the additional uncertainty due to
the
The most likely near future, which Elecraft has (have?) apparently chosen,
could be the constant grumbling we will all make for years to come as we sit
and stare at our K3s with various dead boards. Flex, Yaesu and Icom are all
rooting for this status quo to continue.
I'd like to suggest a
Here's a statement: "RF in the shack" does not equal "simple RF overload". Let
me define my terms.
"RF in the shack", which many people have experienced when using "unbalanced"
antennas like verticals, off-center fed wires, and others, is caused by
radiation from the outside shield of the
I hope this helps anybody facing the same issue.
The fluorescent lights in my basement make horrible RFI noise, especially on 40
m but really affecting all bands. They raise the noise floor by about 16 dB on
40. I discovered this during Field Day *last* year when I set up in the back
yard.
Thank you for all your responses. I did not mean my question to solicit the
thousands of ways of solving this problem, but merely a poll of hams'
experiences running high power. Based on all of the private and public
responses I received, it's about 50% who've had problems with consumer
I'm really curious to ask those on this list who run high power:
Do you find that you get into all kinds of devices around the house?
I ran the KPA-500 in an extended manner for really the first time during the
Phone SS and immediately:
1/ interfered with FM broadcast radio.
2/ caused the
>>> An electret mic has much better fidelity than an inexpensive dynamic mic,
>>> so the CM500 is probably a better choice.
Is that really true? If you looked inside all of your local AM broadcast
stations, all you'd see are dynamic microphones.
I'm not sure why most headsets have electret
This issue is a kind of double-edged sword that cuts not only newbies with bad
fists, but Big Guns with fists that are, well, *too* good.
I noticed this opposite phenomenon as soon as CW SS got started. It seemed that
the average CW speed was way up this year. (I hadn't operated the SS in a
Good advice from Chuck and Bob below.
The thing to remember is that the noise reduction isn't just an on/off button.
There are 32 levels of noise reduction to choose from. Some of the levels add
just a touch of NR while others almost destroy the signal, adding artifacts and
other things in the
Ah, lightning. Whoever performs an analysis of the KIO3 failure mode after
being struck by lightning might have what's necessary for a very lucrative
business.
Actually, I'm surprised that the board hasn't already been reverse engineered
in China, enabling an aftermarket for KIO3 replacements.
> The K2 is somewhat of a spiritual event. There are many
> who are very attached to their K2's... because we built them,
> got familiar with them, used them in memorable situations,
> and became fondly attached.
So true, Robert!
My K2 got soaked in a giant rainstorm in Virginia a few Field
s.
>
> 73,
> Drew
> AF2Z
>
>
>
> On 06/29/22 14:57, Al Lorona wrote:
> > Late last week, I pulled my two-year-old LiFePO4 battery out for Field
> Day prep and found that it had failed. Efforts to reset the battery
> management system didn't succeed. I got to use this batter
Late last week, I pulled my two-year-old LiFePO4 battery out for Field Day prep
and found that it had failed. Efforts to reset the battery management system
didn't succeed. I got to use this battery on exactly two Field Days, which
means it cost me almost $200 per Field Day! Sad, very, very
According to Al, N1AL, "The effective bandwidth of the P3 is approximately one
pixel on the display, which is SPAN/468. So, for example, if the span is 47
kHz, the effective bandwidth is about 100 Hz."
To "convert" or "correct" to a 1 Hz bandwidth, use the formula:
BW_correction_factor = 10 *
Several weeks ago, someone here recommended listening to a recent interview
with receiver test guru Rob Sherwood. In it, the interviewer pressed Rob for a
radio recommendation. At first he resisted but eventually gave three
transceivers that he said "anybody would be very happy with". But when
Have you studied how SSB signals look on your panadapter? I believe about 90%
of all phone signals have a very pronounced peak at about 400 or 500 Hz. This
peak is sometimes 10 dB (or more) higher than the rest of the bandwidth. This
is wasted power and, to my ear, makes signals sound muddier.
This page:
https://ham.stackexchange.com/questions/1124/what-does-a-noise-blanker-really-do-and-what-are-the-side-effects
contains a pretty good synopsis of why noise blankers mess up on strong signals.
Al W6LX/4
>In the end all I learned was that NB
>levels were mostly unpredictable in
Whenever somebody mentions "window line" here, one of the first objections
raised is that "when it gets wet, it has very high loss".
The landmark paper cited is by Wes Stewart, N7WS, which can be found here:
https://www.sadxa.org/n7ws/Ladder_Line.pdf .
I'm not trying to discredit that paper
Happy New Year,
I think N7WS has shown that when that window transmission line gets wet, its
loss goes way up. So some of the change you are seeing in rain/snow conditions
could be due to this higher loss.
Al W6LX/4
>
> My experience with antenna's changing due to moisture is with my
>
Have we, in fact, established that this attenuator is enabled at any point of
the tune cycle? Because if not, then we're all spun up for nothing.
Is it reasonable to believe that the attenuator was one of those design
elements that might have been deemed necessary at one time but then the
Jim beat me to it. I was also going to urge you to transmit as much as possible
on 20 meters with the highest power you can. The idea is to become a hair ball
that Xfinity can't swallow nor can't cough back up.
If anybody comes up to you to complain that you're still causing outages, use
the
7030.0 - on the peak
7029.7 - a little down the south slope, couldn't make it up the last crag
7028.9 - in the car at the trailhead parking lot
Al W6LX/4
On Monday, September 20, 2021, 10:11:55 PM EDT, Wayne Burdick
wrote:
Gaussian describes the shape of the QRP frequency distribution *and*
If you regard QRP ARCI as a de facto authority on QRP in the US, they recommend
7030, and they call it a 'center of activity' rather than a calling frequency.
I take that to mean we should imagine a Gaussian distribution of activity above
and below this center. I imagine a standard deviation of
Hi, Mike,
This issue comes up regularly here.
It sounds like this is a new problem with the K3S? Or has it always been like
this?
There are so many settings that could have changed. You'd have to list them all
for us. I assume that you know about the receive equalizer, AFX, and DSP, all
of
The Logikey keyer by Idiom Press lists no less than ten "emulation options", or
keyer timing modes. They are numbered "V0" through "V9", including three
different Curtis A modes, three Accukeyer modes, and others. "V0" is the best
timing I've ever used on a keyer. I don't know whether it's A,
Thanks to Al N1AL, Jack W6FB, and Dave AB7E for great information that helped
me a lot.
I'm in the circuit simulation business, after all, and I confess that I was
just being lazy, so I ran some simulations that confirmed what Dave, in
particular, had said.
As suggested by Dave, I chose
This question is about how manufacturers spec the matching range of their
antenna tuners.
If an antenna system presents an impedance of 5 + j0 ohms to the antenna tuner,
that's an SWR = 10 to 1.
But, an antenna impedance of 50 - j143 ohms is also SWR = 10. So is 110 - j200
ohms.
When a
The recent thread on small and inexpensive vector network analyzers made me
wonder if and when someone will make either a manual or automatic antenna tuner
with something like one of those VNAs used as a front panel display. With the
VNA in Smith Chart format, how cool would it be to tune the
When this subject appeared last week I had composed a reply but then slept on
it and canceled it the next morning, as I probably do 80% of the time.
In this my second attempt, let me say that I've always been amazed at the power
wielded by Rob Sherwood. Thousands of hams hang on his latest
If by 'most infectious' you mean highest number of cases per 100K residents in
the last 7 days, that distinction goes to Arizona.
If you mean most deaths per 100K in the last 7 days, CA isn't even close to
Kansas in the top spot.
But we Californians know what you meant, and thanks for the
So I read not only K6XX's report, but the entire issue of the Jug.
http://nccc.cc/jug/2020/09sep2020.pdf . I am completely floored by the
complete destruction of Bob's place. Bob, I don't know if you're a believer,
but I for one am praying for strength for you, my friend.
My impression of
Power was shut off to my noisy urban neighborhood yesterday while crews
replaced a power pole. For a long time, I have wanted to check my HF noise
floor when the power is out, and yesterday was my chance. For days like this
is why my station is solar-powered!
I expected to be surprised but I
I'm glad Dave added that to the end of his message, because each time the topic
of multiband antennas comes up, we are told, "That's too lofty a goal for one
antenna. Just put up a resonant antenna and all your troubles will be gone."
All except for the problem of operating on all bands without
Using AC6LA's Line Loss calculator, and making the following assumptions:
Line impedance: 420 ohms, (1/4" copper pipe spaced 4 inches apart)
SWR at antenna: 14.0 (Z = 30 ohms)
Line attenuation: 0.0266 dB/100 feet (Duffy, "RF Two Wire Transmission Line
Loss Calculator",
I have the volunteer I needed to scan QST for me. Thanks, everybody.
Al W6LX
- Forwarded Message -
From: Al Lorona
To: Elecraft Reflector
Sent: Friday, July 17, 2020, 01:41:11 PM PDT
Subject: [Elecraft] [OT] QST Scan
This is a request for a favor... to anybody who's got
This is a request for a favor... to anybody who's got a complete QST
collection... would you be willing to scan 1 page from 1995 and send the scan
to me? The low-res scanned copy on the QST Archive at the League's web site
doesn't clearly show a detail that I'm interested in.
If you're able
Not many FD reports on the reflector this year; Covid obviously took its toll,
so I'll offer this (sad) report.
NR6TT's Field Day was a Failed Day this year. Wanna know what it's like to
break your slingshot on the very first attempt to use it? Good thing my
14-year-old was there to throw a few
I have always felt as K9ZTV does.
I don't mean to speak heresy here, and I would never deny anybody's right to
use full QSK, such as when chasing DX. However, I have never felt the need to
hear between dits. Between characters or words seems more than enough for me,
especially at the CW speeds
I used:
1/(1+exp(-x))
where x = the pulse train. I then modulated a 7 MHz carrier with the result
(although the results don't care what the RF frequency is, of course).
Al W6LX
>>>Which sigmoid function did you model, Al?
__
I used to think that the rise and fall times of the CW pulse didn't really
matter much to the sideband levels; I believed that it was more a function of
the waveshaping, especially at the corners of the pulse.
But I just ran a quick simulation of a pulse train going through both a raised
Really interesting, Vic. Here's a minor point: Instead of measuring to the
"first whiff" of RF, I'd probably measure to the point of 90% of max RF value.
This is because the rise time of a pulse is usually defined as the time to go
from 10% to 90% of the final (peak) value.
Congratulations on
Jim is right. Those of you outside of California would probably have a
difficult time imagining how differently we are experiencing the lockdown--
which is an aptly descriptive noun-- here in California. The latest long-term
outlook we received from Sacramento earlier this week made most of us
Precisely the intended application for a visual aid to show where the
sensitivity of the receiver sits relative to the band noise. W3LPL is
absolutely correct in asserting that relatively few know how to optimize their
settings for a given band condition.
Just sayin'.
Al W6LX
> wrote:
It's a good thing I didn't carry through on my plan to operate the K3 with a
paper in the place of the top cover! That was a close call.
Seriously, don't *all* DDSs/PLLs/synthesizers/SDRs (and, thus, all modern
transceivers) tune in steps? How is the tuning step related to the stability of
an
Now that the K4 has exact knowledge of its gains and losses through the
preamps, attenuators, splitters, bandpass filters and so forth, could this
enable an alternate way of visualizing the receiver's range? This alternate
measurement would be quite useful in setting the controls optimally for
Jack beat me to the comment I was going to make. Far be it from me to
contradict a seasoned contester like W3LPL, nor to dismiss the comments of many
others, but I wonder how many "the K3 sounds bad on SSB" comments occur because
of operator error in setting the AGC and gain controls
Thanks to all who replied to my question about gap width on your paddles.
I got answers ranging from 0.6 mil (15.24 micron) to 30 mil (0.762 mm), a
spread of 50x! This obviously comes down to personal preference. I had to smile
at the reply from George, W3HBM: "Whatever feels good to you!
Hi, Everybody,
What do you set your gap width to on the contacts of your paddles? Is there an
optimum gap width, or is it totally a personal preference?
Because this is an off-topic post, if you reply to me please do it directly.
Thanks!
Regards,
Al W6LX
I just read the Elecraft December Newsletter, so I made a quick phone call.
It's still morning over there.
Big Radio Company: How may I direct your call?
Me: Yes, hello, I'd like to speak to your CTO.
BRC: Oh, I'm sorry sir, but I can't do that.
Me: How about a co-founder?
BRC: No...
Me: Why
Fair enough, but it kinda goes without saying that in a group FD with 1 station
per band they'll use resonant, single-band antennas. If this is our best
argument against the 'multiband dipole', then that antenna still holds its own
pretty well in a multitude of other situations.
I have always
Precisely because of this objection and countless others, is why I expressly
stated, "...at the expense of any other possible advantage." I think we all
understand that there's no magic antenna. The 'magic' of the antenna we're
discussing here is simplicity, all-frequency operation, and high
My experience with single vertical or sloping wires is exactly the same as
AB7E's. I have, over almost twice as many Field Days as Dave, come to a similar
conclusion, with the slight difference being my preference for an "all-band
dipole" fed with balanced line. This obviates the balun and
And not just antenna and feedlines, but the AC wiring in your shack, the
potential EMI problems, etc. This is why I keep saying that hams badly need a
tutorial -- perhaps something named, "What to Expect When You Run High Power".
There are lots of us, including me, that could learn about the
1/ It always seemed to me that this method heats up the components much more
than using a simple soldering iron, where you can pause between soldering each
pad to allow heat to dissipate.
2/ Is that a capacitor standing up at about the 1:12 mark? Not good.
Al W6LX
I am sure there are just as many horror stories as "I've never had a problem"
stories. Such as the time I was carrying a small Ten-Tec shortwave receiver and
was detained for almost half an hour while the agent stared and actually asked
me, "Voices come out of this thing?"
Meanwhile, an
You guys have now reached the scenario I was trying to ask about last week,
but obviously didn't make myself understood.
When I asked if the K4 would be able to 'talk to the outside world', I meant an
ability to initiate communications with a web site, a server, or something else.
Yes, allowing
Thanks for posting that, wunder.
It was bound to happen... a radio whose font size will *force* me to wear my
glasses while operating it. >>sigh<<.
Here's a really dumb question: Is the Ethernet bi-directional? We know that
the radio can be talked to (controlled) by some external thing.
Adding on to the RF part of the adjustment described by Mr. McGraw below, the
idea described in this old post-- I still contend-- would be a very useful
graphical way of making the adjustment. Not coincidentally, I wrote it in
response to a similar post by Bob almost two years ago:
There's always a lot of discussion about measuring SWR, low SWR values, SWR
lights not lighting up, etc. Here's something that might give you a better
'feel' for SWR.
Imagine that you measure your forward power at 100 W and your reflected power
at only 1 W. You'd probably be very happy about
I don't think you guys understood me. I shouldn't have veiled my concern with a
tongue-in-cheek post.
So I will be direct. I was referring to the physiological event of touching a
screen with a finger. It must be just me, because a large percentage of the
time a touch screen does not respond
Thaddeus sits down at the rig. Today is the day Bouvet is supposed to come on
the air, and thousands of hams around the world must be tuning around at this
moment trying to be the first to work the DXpedition.
He gets a feeling and tunes low in the band, turning the knob as if he were
breaking
About two months ago I posted that amateur radio needs a tutorial, 'What to
expect when you get an amplifier'. As we see again and again here even basic
things like cables, connectors, grounding, and house wiring that work fine at
100 W may be inadequate for 1500 W. We need guidance to study
G3TXQ's work here is awesome, as is N7WS's before him. I'm thinking two things:
Thing 1 is that, clearly, water really messes up window line's loss. However,
I'm guessing that a/ in a place like southern California, where perpetual
drought is the new normal; and b/ in an installation where the
>>> the feedline is a wire dangling from the antenna
>>> that isn't connected to anything on the other end.
That "dangling wire" is actually *two* wires, and the field of one cancels the
field of the other for no net radiation or reception -- at least that is the
condition we're trying to
You guys keep talking about coax-fed antennas. Yes, although it may be easy to
wind coax around a toroid and put it up at the antenna midpoint, that's not so
easy with open-wire line. This discussion was very coax-centric and I wanted to
open your minds that not everybody feeds their antenna
By the way, whenever Jim says, "...a very good common mode choke at the
feedpoint of an antenna...," he means an antenna fed with coax. For the rest of
us, of course, that choke would (should) go at the output of the antenna tuner,
whether in the shack or close by.
Al W6LX
JR - I have a folder of dozens of replies to Elecraft posts that I've never
sent. (I try to exercise discipline so that the moderator doesn't have to slap
me on the hand.) But your reply said *exactly* what a draft that I had written
said. I'm very happy that you expressed the same idea.
No, not a null, but a rolloff. When I quoted -40 dB I didn't mean a notch at
one frequency, but the stopband level reached by the time you get well into the
broadcast band. So that would be -40 dB on all AM stations below a certain
frequency.
The K3 is a good receiver, but every receiver has
Vic, it may well be your imagination (!) but you may also be hearing the
rejection that your tuner gives you, particularly to strong AM stations in the
broadcast band. My measurements, as well as circuit simulation, show about a 40
dB rejection of AM stations when the tuner is tuned to 40
I'd like to obtain IQ baseband files of an FT-8 signal, either separate I and Q
files or combined in one text file. Is that easy for someone to do?
Thanks, and please contact me off list.
Al W6LX
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Home:
Howie this is excellent data. Thank you for your work in this area.
The table really clearly shows the tradeoffs between cost, weight, volume,
capacity and everything else. Alkaline batteries do pretty well for themselves,
although I'm not sure why the voltage for 8 cells is listed at only 9.6
The poor guy who started this thread just wanted to know how to wire a mic. It
quickly became a discussion of whether he should even use that mic. I don't
believe we have that right. The question is about an XLR connector. We should
either answer his question or lay out.
Al W6LX
I'm not sure I agree with the exact numbers, Ian. I'm looking at the review
from Nov 2015 QST (from the Product Review archive on www.arrl.org ) and it
appears that the difference in phase noise between old and new synths is closer
to about 3 dB (difficult to tell from the graph) beginning at
NR6TT/7, situated 1500 feet above Flaming Gorge in extreme northeastern Utah at
7700 feet, was plagued not primarily by the thunderstorm QRN, dead band
conditions, or the incredible windstorm on Saturday night that undid a tautline
hitch and knocked down our antenna, but by curious passers-by
If you do take the icom, at 3.5A receive current drain you'd better take two
extra batteries, too.
Al W6LX
>> Take the K3 , leave the IC-7610 at home. It’s to darn heavy to lug around.
>> (19 lbs )
>>NS2N
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I wrote an April Fool's article back in like 1999 (I might still be able to
find it on dejanews) describing a make-believe ARRL contest which was totally
automated; contesters could come home from work and peruse their logs to see
what stations their computers had 'worked' that day. When
Contrast your experience, James, with what happened recently when I purchased a
kit on eBay from a seller in a country that now has the NSA observing me
closely for collusion. When I emailed to tell the seller that two critical
parts were missing from the kit, he replied that that was "rubbish"
Scott,
If the weakest signals are already activating the AGC, that's the exact
condition that leads to the many 'my K3 is noisy' complaints that we see here.
Plus, that tends to make all signals sound like they're the same strength,
another complaint we've heard in the past.
In fact, you
Hi, Barry,
It's not the signals that determine whether you need a preamp, it's the noise
level. A receiver should have enough gain to put its internal noise floor below
the external, atmospheric noise floor, so that it doesn't become the limiting
factor in hearing weak signals close to the
>>> But who doesn't use a shack
>>> computer these days?
Me.
Al W6LX
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This
I re-named the thread as a courtesy to the members who don't want to read this.
We're getting caught in a mathematical war between the linear and logarithmic
worlds.
± 20% in Watts, is about ± 1 dB in log. 1 dB accuracy is plenty good enough for
us, folks. Especially given that any impedance
If we are to be consistent and follow advice from countless (delighted)
Elecraft owners on this list, any buyer of test equipment like the DMM in
question is going to ensure that the company will be easy to contact and work
with and stand behind its product when necessary. Yes, many times I've
I found it mildly gratifying that our hobby is listed at #2 of these 75:
https://www.artofmanliness.com/2016/01/25/the-ultimate-list-of-hobbies-for-men-75-ideas-for-your-free-time/
Certainly, climbing a tower, sticking your hands into the HV compartment of an
amplifier, or emergency
Poor Wayne. No matter how he positions an Elecraft product, a prevailing
response is, "Yeah, but Elecraft doesn't do A or B."
As consumers, we have been perfectly conditioned to regard more as better. I
mean, if Brand X has 'more' than Brand Y, we automatically declare Brand X the
winner.
Excellent. Thank you, Alan. Data for this particular measurement are very
difficult to find on the web -- of course it took an ex-HP guy to do it!
Times Microwave (a manufacturer of coaxial cable) says 0.01 dB per UHF
connector pair (PL-259-to-SO-239) at HF; I have seen other private
... Icom owners who have received a technical response from the president and
lead designer of Icom and/or sent in a photograph of their rig from overseas
and had Icom service technicans troubleshoot it for them just from the photo.
Al W6LX
Does anybody know if the "dual RX" is full diversity reception?
Al W6LX
>>> ...to support the "dual RX" capability of the 7610.
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Help:
You said, "In my opinion based on inspection of the schematic, the issue
resides in the fet
post-filter amplifier that is controlled by the "hardware" AGC (and manual "RF"
gain control)."
You were making a relationship between hardware AGC and the loose spec of the
FET in question. By saying
Wes stated that there's a component in the AGC circuit that changes the onset
of hardware AGC due to component tolerances. I suggested putting that theory to
the test by actually measuring it.
Al W6LX
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