>This also is just another example of our strange predilection to always
>blame the K3 first, which after noting what actually was found, is most
>often just dead wrong.
>Guy K2AV
Yes. The problem almost always is not with the K3. I'd say 80% of the time it's
the logging or computer program con
Hi, Steve,
I ran into that bug about a month ago. Dick Dievendorff sent me to elecraft.com
to get a new version with the fix. You want to find version 1.15.8.18, bottom
of the page.
http://www.elecraft.com/K3/k3_software.htm
R,
Al W6LX
From: Stephen Sheare
If there are any [Keysight Technologies] SystemVue users out there I had
implemented W9GR's CESSB algorithm after his first excellent article, and I'd
be happy to share the workspace with you.
Dave also made his MATLAB files available for download from the ARRL site after
his initial article, f
Holy smokes. If the ceramic was actually blown off of the transistor packages
(!), be careful not to inhale any ceramic dust that may be present. That's
beryllium oxide which is quite toxic in dust form.
Al W6LX
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Slight correction: not a factor of 2.5, but 2.5 dB, which is a factor of about
1.8.
Al W6LX
>>> It is interesting note that the CESSB methodology
>>>increases the average power by a factor of some 2.5.
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Okay, I see what you're looking at... I believe that's a plot of the output of
a simulation, whereas in practice he's seeing about 2.5 dB [re: the original
technical article in QEX Nov/Dec 2014].
Al W6LX
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1. I have the clock on all of the time.
2. Today when I turned on my K3 I noticed that the clock was behind by several
seconds.
3. All I did was hit the DISP button, then hit it again to look at the clock
again and it was back on the correct time. As if it re-read itself and updated
itself t
Is the P3 TX MON 200 W sensor damaged by application of power levels higher
than 200 W?
Thank you,
Al W6LX
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Post: ma
There's a lot of tension on the list right now. Can we all just step back for a
second?
This list, at times, can be downright infuriating to those of us who ask a
question in good faith, only to have the thread go off the rails in a matter of
minutes. I've been victimized countless times. When
Again and again, I have asked (privately) those reporting 'bad K3 audio' to
furnish me with settings, measurements, recordings -- anything-- but I haven't
ever received anything with which I could diagnose the problem.
Bad. Noisy. Fatiguing. These adjectives have been used continually to describ
I ran several simulations of the K3 receiver using Genesys (from Keysight
Technologies) to find out how to use the attenuator and preamp optimally.
An article by Jim Fisk W1HR appeared in October 1975 in ham radio magazine
where he gave the acceptable noise figure (NF) for a receiver on each HF
Yes, I've heard about those amazing EME guys. I guess if you can copy signals
below the noise you know who you are, and you can ignore guys like me!
I have been, of course, referring not to soundcard-decoded modes but to human
ear-decoded modes, using a speaker or headphones. This is the scenari
I must rant: Good video quality... typically LOUSY audio quality. The internet
is filled with videos of rigs where the rig's cheap internal speaker is being
picked up by a camera mic several feet away in an echoey room. Haven't any of
these poor guys ever heard of audio direct?
Al W6LX
Something really nice about the K2's DSP is that all of the bandwidth, gain,
and denoising parameters are adjustable. There is a wide range of filtering and
denoising possible with very fine gradations. If you like to tweak, go for it.
But, as Phil implies, if you lack the patience to get the pa
Ahh, this is right on the mark. How many times have you heard a ham say, "I
didn't like Radio X because it didn't have enough close-spaced dynamic range."
Me, almost never. Instead, I usually hear that hams have discarded a radio
because of a million different reasons like
"bad" or "noisy" aud
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
_
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! Enjoy
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 improperly?
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 a
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 o
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:
>Th
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
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
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
cosine
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?
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Elecra
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
Occasionally when writing memories to the K3 with the Frequency Memory Editor I
see the following error in the write status window:
WriteMemory2State.OnTimerExpiry
yet the memories always seem to be written correctly.
Should I be concerned with this error?
Al W6LX
_
Something that I've not been able to do successfully:
Tune to a standard frequency station, like WWV on 10 MHz. Center WWV on the P3
screen (in other words, make the Center Freq = 1 kHz exactly).
I want to span down from 20 kHz to the minimum span, 2 kHz.
NOTE: FixTrack = Fixed-tune mode fo
I once spoke to a nationally-known, "Big Gun" contester who felt that the phase
noise and key click sidebands generated by his station were an asset because
they cleared a "guard band" around his signal since other stations had to stay
away. He felt no motivation at all to clean up his signal. I
I don't know the motivation for the FM filter request, but I will say that here
in the US there are vast expanses of the bands that are mostly unused. For
instance, night after night there isn't a single station between 3600 and 3700
kHz here on the west coast. As another data point, I just coun
The subject of extra-narrow SSB bandwidths comes up fairly regularly. These 1.8
kHz (and even 1.5 kHz in use out there) bandwidths are not effective for
everybody. The older I get, the less I can tolerate these narrow bandwidths
for
SSB, even in a contest. They give me listener's fatigue. I am
Right, Don!
I still believe that many K3 users are under the erroneous impression that the
roofing filter determines the receiver bandwidth. It does not. The HI and LO
knobs do.
The only thing the roofing filter does is determine the MAXIMUM possible
bandwidth of the receiver.
In 99% of case
Another way of looking at it is this:
Just because a signal gets inside of your roofing filter doesn't mean squat. If
the mixers can handle the signal's level, and the HI LO cut controls can slice
off the signal, you won't even know it's there. You simply don't care!
The only time this could be
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 meters
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 it
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.
Buildi
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
_
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 wit
>>> 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 achie
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
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 our
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
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 to
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 th
I wasn't clear enough in my last post. Let me try to put this idea out there
one more time.
If you have an antenna modeling program like EZNEC you can perform a simple
experiment to illustrate a strange behavior of ground loss.
The EZNEC example "Elevrad1" is a 1/4-wave vertical with 4 radials
I don't know why the server always does that my posts. Sorry. Last try. Then I
give up.
If you have an antenna modeling program like EZNEC you can perform a simple
experiment to illustrate a strange behavior of ground loss.
The EZNEC example "Elevrad1" is a 1/4-wave vertical with 4 radials
This is true for some people, but many folks can't get past the looks of a rig.
A "well-known" ham in Nevada likes to get on 75 meters and when the subject of
the K3 he once owned (for just a few days) comes up, he loves to retell the
reasons why he got rid of it. "It looked like it was put tog
Exactly right, Wes. The 10 dB rule-of-thumb is a *minimum* and it would be
better if the measuring instrument were more than 10 dB better.
I'm not sure that the Flex radio originally mentioned meets that phase noise
requirement. If its phase noise is on par with the K3's then it's not suitable
Oh! There's the P7... calling CQ... and no one is coming back to him!! I'll be
the first to work him... I can't believe this... Let me just use my cool
touchscreen... I move his signal with my index finger into the passband... and
then throw my call out... wait... what the... Oh no, the itty-bit
Adam has always been very dismissive publicly of the K3 architecture. However,
I would hope that his personal opinion does not in any way influence the
results of his testing.
Al W6LX
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Adam Farson's explanation of why the ADC clipping level has to be avoided at
all costs is another reason why many people still prefer analog front ends.
Don't proponents of analog audio point out that when an analog channel
overloads, it does so "gracefully"? This is especially true of fans of v
This is really good information, Alan, and makes sense. Regarding the
approximation to Gaussian noise... given that most signals on a crowded band
during a contest are highly compressed (their peak-to-average ratios are much
smaller) would this make matters better or worse for the ADC, or no dif
I'm sorry, I don't begrudge anybody wanting to experiment with digital voice,
but every time I listen to audio clips of DV I am appalled by the sound
quality. I have to prefer SSB almost every single time.
The examples on that site of DV with a 20 dB SNR are pretty awful. Thy soun
like litte
That's not so much of a bandwidth problem as a courtesy problem.
Al W6LX
_
And don't try to make a SSB QSO on the frequencies that the SSTV
crowd has claimed, eventhough they are dead when you call.
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Oh no... Oh no, not the "bad K3 audio" thread again?!
I'm pretty sure that, five years from now, people will still be asking, "Was
the phase noise of the new synthesizers reviewed in QST ever fixed so that it's
better than the old synthesizer at higher offsets?"
Al W6LX
_
I think what Steve is asking for is a dot (non-line) marker at the *bottom* of
the waterfall and that doesn't have persistence (doesn't "leave a trail"), so
that he can line it up with a scrolling signal and then QSY to it before it
disappears off the bottom of the screen. It's actually not too
When B SET is pressed the S-meter is tied to the sub receiver. But how does one
go about calibrating the sub rx's S-meter? Is it even possible? The User Guide
seems to imply so.
Al W6LX
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Isn't the line out 2-channel mono, except when the sub is turned on? For
example, you won't hear the AFX effects on the line out.
Al W6LX
From: Robin Moseley
To: w3...@embarqmail.com; todd ruby ; Elecraft Reflector
Reflector
Sent: Wednesday, November 11, 2015 3:55 PM
Subject: Re: [E
In fact I've always calibrated my K3 S-meter to be 5 dB per division both above
and below S9. This seems to me to be a consistent way to do it that's easy to
read and easy to mentally convert to dBm. And the K3 amazingly consistently
sticks to this 5 dB calibration from S1 to 50 dB over.
Al W
I finished the SSCW on 40 and while in QSK noticed my own echoes. I thought
that the K3's QSK or sidetone had weirded out and was confused and bummed out
about it until I listened on a 2nd receiver and figured out that it was my own
echoes, although I didn't believe what I was hearing. I've neve
Right after the CW SS I composed a message for the list, then trashed it after
sleeping on it which I always do before posting. Now that the issue has come up
on its own I wish to make an observation.
During the contest I heard many stations with shortened dits. They sounded
pretty bad and I re
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 noise
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 don't
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"
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 parody
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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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 in
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 of
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
_
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 V
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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I could have sworn that in the past Mkr A (and B) could be moved around once
the
trace was frozen, but now the markers are also frozen with the trace. Too bad.
I
used to use it to make measurements of transient signals. I hope this is
temporary. 00.41.
Al W6LX
What you should have done at the beginning of the conversation, Lee, is sent an
e-mail to Wayne and Eric (and also to the president of Vertex). By the time
dessert came around, you could probably have read him the reply from Elecraft.
On 12/1/2010 7:14 AM, Lee Buller wrote:
> So, after this lo
Tables like this one mean almost nothing to me. Dynamic range is so good across
the board that it's now overrated. When you're talking about differences of a
few dB other details start to matter much more. For instance, the chief factor
that pushed me off the fence toward a K3 was it's diversity
To add to the collective RFI intelligence of the group: I identified yet
another
source of RFI this evening.
Cross off the Uniden DECT3080 cordless phone off your Christmas shopping lists.
When the handset is placed back into the cradle (the "base" unit) it emits a
noise burst on 80 meters. Th
Several years ago when the K2 modification was created by Wayne to implement a
raised cosine keying filter I installed it and both ran simulations and made
measurements of the resulting waveform, which agreed very closely. In fact, I
liked the result so much that I duplicated the circuit and mod
Months ago I had heard a rumor that the P3 could eventually function as a
read-only display that could inform the operator of these various settings.
Al W6LX
(Subject: line changed to reflect the current topic.)
>
There's a great need for some simple utilities for the K3
that will run with LP
This morning I got up and turned on the K3. I was shocked to find RFI from my
Eveready flashlight on 7040, a birdie on 7160.1850192827354637, and with the
noise blanker on I could hear splatter from my nextdoor neighbor's kilowatt at
the bottom of the band. So I decided to update the firmware.
Why does my P3 do this?:
In LSB mode, whenever I go into TUNE for more than about six or seven seconds,
upon hitting the XMIT button to come back out of TUNE the VFO A cursor has
shifted into an incorrect position. (Instead of showing an LSB position below
center frequency [in this particular c
An SSB signal that is S9 on the K3's S-meter is not going to measure S9 on the
P3.
The reason is that an SSB signal has bandwidth, and the sum of all of the
signal
within that bandwidth is what the K3's S-meter reads.
You would have to add up all of the power of the SSB signal on the P3's disp
The use of professional broadcasting and recording microphones is totally
ridiculous overkill for ham radio application. On the air, these mics are
indistinguishable from much cheaper units, if everything's adjusted properly. A
ham who spends more than $75 on a mic because he feels he needs to
Receivers are always ranked by the "2 kHz third order dynamic range", such as
at: http://www.remeeus.eu/hamradio/pa1hr/productreview.pdf but do we really
grasp the meaning of these specs? For instance, the Elecraft K3's (after
synthesizer upgrade) number is 103 dB, good enough to be in the top
When purchasing a used K3, remember to ask, "Are the filters genuine Elecraft?"
Al W6LX
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These two sentences contain all of the phonemes (sounds) of the English
language and I have found them useful in adjusting things:
"Joe took father's shoe bench out."
"She was waiting at my lawn."
Al W6LX
>> The process is to speak random words for several seconds while monitoring
>> wi
How are your 'ears'-- your ability to copy very weak CW signals?
Here's a way to "measure" your ears. You'll need your panadapter set to a
narrow span such as 2 kHz. Turn on averaging so that the noise flattens out to
allow you to estimate the true level of the noise. Use a full-screen vertical
Bill,
Shame on all of us for nearly stifling your question. I hope nobody is ever
scared to ask a question here, no matter what it is.
Happy New Year,
Al W6LX
>>When I posted about the gain levels of amplifiers etc. I was worried
>>about a back lash and hate mail - I nearly did not post
Wow, things have changed. In the early years of the Macintosh its claim to fame
was true plug-and-play, where the user never had to go into the operating
system to execute commands, never had to see a "DOS prompt". Since following
this thread I see that that is no longer the case. That's too bad
Take it from me: metal knobs are overrated. I'm kind of embarrassed to admit
this but I once obtained some really spiffy metal knobs to replace the plastic
ones and ultimately put the plastic ones back on because I believe plastic
really does have a better feel, especially when knobs are small.
Many of us would feel a psychological edge if we pushed an amplifier such as
the KPA500 from its rated 500 W to, say, 625 W. It sounds like so much more,
doesn't it? It sure makes us feel better to think that we're louder on the
other end.
But first, on your S-meter take a look at the width of
WARNING: LESS-THAN-POSITIVE RESPONSE BELOW
I don't know... With three tattoos, two full beards and a man-bun on their
page, I don't quite think I'm in their target demographic.
I think their thing is simply equalizing the frequency response of each ear,
no? Just use the RX EQ on your K3.
Al W6L
It isn't so much that 'the strongest signal in the passband determines the gain
of the receiver', it's that once that strong signal sends the
receiver into AGC, additional signals in the passband do not increase the audio
output power when the Slope is set at or near its extreme. This is a form
Oh no! I fear this is going to get bogged down in definitions. From Wikipedia:
"Limiting can refer to non-linear clipping, in which a signal is passed through
normally but 'sheared off' when it would normally exceed a certain threshold.
It can also refer to a type of variable-gain audio level c
I spent a little bit of time this weekend and put together yet another K3 AGC
(YAKA) "white paper" to put some measurements and discussion of the results
down in the hope that others may benefit. Maybe it'll help folks understand AGC
better by demystifying some of the K3 idiosyncrasies. I hope i
indistinguishable from the stronger one. That's a limiting receiver, nice for
FM, not so nice for CW/SSB.
All IMHO, of course,
Wes N7WS
On 3/5/2017 10:50 PM, Al Lorona wrote:
> I spent a little bit of time this weekend and put together yet another K3 AGC
> (YAKA) "white
One leg of a horizontal antenna has to, unfortunately, run parallel to the
power lines at the back of a city lot. Will there be more pickup of electrical
noise if that leg has a current maximum, or a current minimum on it, along the
portion of the antenna closest to the power lines?
You can e-m
With firmware 4.66, upon initial power up my clock was several seconds behind
(as shown by the DISP button), even though I had set it only 12 hours ago.
I went into the CONFIG menu to adjust the clock, but as soon as I rotated to
the
TIME parameter the clock apparently adjusted itself (gained b
I read the whole thing, too. It appears that the improvements are measurable...
the only question is, "Is it worth the trouble?" It is obviously an awful lot
of
work. Another question one must answer is, "Am I willing to accept the decrease
in my K3's resale value?" after you are done cutting
The weight of rigs from Japan has more to do with the choice of steel for the
chassis instead of aluminum, and certainly the size of the TS-990 is the right
size for many people. But another observation is that when you look at the
schematic diagrams of Japanese rigs they are unbelievably compli
To add to this: In the case where you have a horizontally-polarized antenna and
a vertical, it might feel like the vertical should be placed off the end of the
dipole, but in fact that's where vertically-polarized response of the dipole is
maximum, so the vertical should actually be placed bro
Hi, Jerry,
That 2-pole filter is probably there to eliminate any wideband noise that might
be generated in the 1st IF amp. It's a good receiver design technique.
R,
Al W6LX
>
> From: Jerome Sodus
>To: elecraft@mailman.qth.net
>Sent: Saturday, June 29, 201
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