For half a century at least (the time I've been pounding brass) ES sent as a
word (not a prosign - it gets the inter-character space) has meant "and" on
the Amateur circuits and in informal communications on many commercial
circuits I've happened to use from time to time.
The challenge for those w
I'll second Don's suggestion about using a 1/4 wave 'counterpoise' and
forgetting the balun!
Philosophically, I keep all passive components that I can do without out of
the antenna system simply because are no "passive" components! If something
doesn't add gain or power, it absorbs signal or powe
Remember that the K3 is designed to be built and options added by even
inexperienced builders. Each Option manual assumes that installing it is
the FIRST time that Ham has ever opened the lid of a rig. Elecraft takes
seriously the idea of promoting "Hands-on Ham Radio" not just for solder
jocks, b
And just how else is SO2R accomplished???
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Hammond
Sent: Thursday, October 25, 2007 9:16 AM
To: DOUGLAS ZWIEBEL; elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT: DSP linked to schizophrenia
Okay - after my K3 (S/N 10) has been nothing but bits since early July while
writing the K3 kit assembly manual, I finally actually hooked on an antenna
today and was enjoying playing with the outstanding filtering options while
tuning across 20 meters.
Heard an old friend, Gena, UA0FAI ,on Sakha
I was raised east of Los Angeles and the saying went, "It's not an
earthquake unless there were whitecaps on the waves in the swimming pool!"
Then, as an adult Californian who had lived through dozens of the things,
some big enough to knock me off of my feet, it was kinda "ho-hum" when the
ground
There's a simple solution to the whole issue of imperfectly aligned toroids
on the RF board. Just add the KBPF3 general coverage filter option that lets
you SWL with your K3 from 500 kHz to 50 MHz. It's a nice, neat little board
that sits right OVER those toroids. When it's installed all you see ar
Craig NZ0R wrote:
"You could avoid the problem by convincing Elecraft to ship a "torroids
(sic) only" version of the kit. It would be the same kit but without the
torroids. You'd have the joy of winding them yourself and installing them on
the board. Of course you wouldn't get the benefit of fact
Hi, Ed:
The K3 Owner's manual Specifications page has the data:
TX: 17-22A typical for K3/100, 3-4A typical for K3/10.
RX: 0.9A (subreceiver off).
As they say, that's "typical". My K3 draws no more than 17 amps on any band
at 100 watts output, well within the normal operating parameters of
Today I had a few minutes to scan 20 meters with the K3. I heard a slow,
hesitant fist calling CQ on 14057, so I grabbed my trusty J-38 hand pump and
answered him.
We commenced a nice slow QSO at something less than 10 WPM. His fist was
perfectly R5 but his spacing was very ragged and uneven. At
Naw, my KX-1 S/N 0004. Wayne gets 1, Eric gets 2, Gary gets 3 so I got 4. Of
course it was the second KX-1 to actually make RF, but it's still S/N 4 .
Ron AC7AC
-Original Message-
No problem, Paul. Your 3 watts barely made it here to Western PA, but I did
manage to get your call sign . Wh
I have Outlook set to put anything with [Elecraft] in the subject line into
the "Elecraft" message folder. That word is consistent, no matter what
changes in the address fields.
To avoid sending out duplicate messages, the new format requires me to
delete the "TO" address, then copy and paste the
02 August 2004 08:14, John J. McDonough wrote:
> - Original Message -----
> From: "Ron D'Eau Claire" <[EMAIL PROTECTED]>
> Subject: RE: [Elecraft] email reflector headers glitch or "feature"
>
> > To avoid sending out duplicate messages, the new fo
That's exactly what the "Artificial Ground" does, George.
When you have a ground wire going to a ground stake it makes a lousy RF
ground, but it'll be a much worse one if the wire to the stake is more than
a couple of feet long because the wire is an appreciable fraction of a
wavelength at HF. If
Have you investigated RF infiltration into the power line going to the phone
'base' unit rather than into the phone line itself?
Ron AC7AC
-Original Message-
I have two antennas...an unmatched longwire and a vertical. The
unmatched longwire interferes with our two line 900MHz phon
Might do. And then when you hit the key with the wrong antenna (or no
antenna) attached, you may need to take a break and replace the finals. The
K2 and K2/100 are very robust systems, but repeated abuse is sure to have
its consequences.
Even with manually-tuned vacuum tube gear, smart ops drasti
TECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rob Locher W7GH
Sent: Friday, November 09, 2007 3:50 PM
To: Elecraft Discussion List
Subject: Re: [Elecraft] K3: An Observation for Struggling Brass-Pounders
On Tue, 06 Nov 2007 17:08:24 -0800, Ron D'Eau Claire <[EMAIL PROTECTED]> wrote:
>
Sri for the blank message in this thread. Phone rang and I was distracted.
Toby and Robert have reiterated what I wrote anyway! A couple of other
points based on experience with my T1.
The T1, like all Elecraft tuners, uses a highly-efficient L-network matching
system. You'll find that it handles
Steve, N5WBI wrote:
Sounds like I may need to use several radials if I go with the T1.
---
The T1 won't require you use more radials! Indeed, the T1 will probably
match just fine with NO counterpoise/radial wire(s). But a 1:1 match doesn't
mean the antenna is radiating e
Probably the reason the hi-res version hasn't been put on line may be
because Eric is focused on herding K3s out the door. He handles all the
files put on the server.
In the current manual the assembly step referring to Figures 7 and 9
specifically suggests consulting Figure 14 which also shows t
Tnx. Toby. We're up to B-8 with a number of fixes, tweaks and additions now,
but I see it's not on the Elecraft web site yet. If anyone's building or
about to start on Monday, drop me a note ([EMAIL PROTECTED]) and I'll send
you the errata direct.
Ron AC7AC
-Original Message-
From: [EMAI
There's another issue that leads to greater feed line efficiency in addition
to the points Jack made: keeping the SWR relatively low. That is, less than,
say, 15:1 or less. All feed lines become lossy at high SWRs. One reason, as
Jack mentioned, is the likelihood of dielectric breakdown. That's usu
I was taught "American style" straight-key sending to lay my arm on the desk
with and keep my wrist relaxed but straight. The whole forearm moves to
operate the key with the bending taking place at the elbow.
In the merchant marine and Army radio schools, moving the wrist was
considered the quicke
Nothing bad happens if you leave the balun out, Peter!
Sometimes we over-complicate things. A balun is a good example. All that's
needed to produce a balanced "feed" is a length of transmission line (1/4
wave or so) and a balanced load. If you have those things, it doesn't matter
whether the outpu
As others noted you can have up to 5 roofing (crystal) filters in the main
receiver. I don't recall seeing a number for the Aux receiver.
I don't know of any conflicting configuration options like you mention for
the K2 either, but there are A/B choices to make. For example, you can
choose betwee
One open wire line feed system I built was for a doublet hung "inverted Vee"
style from a wooden mast. I picked up a bunch on plastic "Dog Bone"
insulators from HRO or some such place. They are about 3 inches between
holes and have a series of ridges near the center to extend the surface
path. They
The AM crowd seems to prefer open wire line, balanced tuners, and as much
wire in the air, and as high up as they can get it.
Brett
N2DTS
Yep, that's Ham radio ca. 1940 in the heyday of AM.
And, you know, it's not a bad strategy for getting a si
I've seen those. Good idea!
With so many plastics on the market today, I always check a sample before
subjecting it to RF. On the sort of open wire lines almost everyone uses
today, operating at moderate SWR levels, not only are there big RF currents
flowing at the current loops there are big RF
Good question Ruchan and I, too, was watching for answers.
I understand some fabricators do use it as a "preventative", but I don't
know why: are they using a substandard connector material that needs the
help or is there some other reason?
I did not use DeOxit on my K3 or any other rig. I haven
See the Assembly Manual, Page A-8. It should be in the package listed there.
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Doug Person
Sent: Monday, November 19, 2007 4:58 PM
To: Elecraft Discussion List
Subject: [Elecraft] K3 Arrived in Cla
Vic is quite right!
I'll add a couple of points:
1) The power display of the K3 is quite good, from a few milliwatts to 100
watts. It can be calibrated even further if you have a known, calibrated
meter to use with an external dummy load.
2) If you are interested in measuring the SWR on the fee
Be very careful of any old VOM's around modern gear!
For resistance checks they often used sufficient voltage and current to
destroy modern i.c.s
Even though you're only looking for a short circuit, if you do NOT have a
short, whatever voltage/current the old VOM delivers will be placed across
t
Hi and welcome!
It doesn't happen too often, but have you checked the accuracy of your
"cheap" DMM? If you don't have anything to compare it with, you can get an
idea of its condition by measuring the voltage across a fresh alkaline
battery. It should read about 1.57 and 1.58 VDC.
Ron AC7AC
___
That's why a connection to earth ground is recommended and important. It's
often pointed out that it doesn't matter if everything is grounded as long
as it's at the same potential. That's true, but connections to the earth are
usually all around us, often in unexpected places.
It's the same as th
The solder stations I'm familiar with have directly grounded tips.
To be sure I'm not being fuzzy-headed, I checked the Hakko on my bench and
its tip is certainly connected directly to the mains ground (< 1 ohm).
The only time I've found a series resistance in ESD gear is for those
components pe
Hi Roger:
Are you using Downloader 1.0.11.19 (or later)? The downloader was upgraded
recently and the new one is required to download the new files.
To be sure the files are there, I just checked using the downloader. Here's
what it reported:
23:19:08 Enter OnDirectoryReadComplete
23:19:08 Your
Very true David. "Earthing" to the mains ground is the proper way to do it.
If there's a separate ground rod for any reason, such as an RF ground, most
codes require that it be connected to the mains earth ground as well.
It's worth making sure the mains ground is connected too! I've encountered
a
Has anyone noticed how little that "safety ground" is used by commercial
products these days?
Few, if any, household appliances such as vacuum cleaners or even kitchen
appliances use it now. They all have two-wire plugs. For outdoor use I have
a electric chain saw, and electric circular saw, an e
ection has offered a huge improvement, but what is it's
effect? It makes the three-wire grounded outlet even less important!
Ron
-Original Message-
From: Don Wilhelm [mailto:[EMAIL PROTECTED]
Sent: Sunday, November 25, 2007 5:44 PM
To: Ron D'Eau Claire
Cc: 'Elecraft Maili
Yes, GFI is a great safety factor. Perhaps it's made the three-wire safety
ground outlet obsolete?
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David Wilburn
Sent: Sunday, November 25, 2007 5:19 PM
To: elecraft
Subject: RE: [Elecraft] Much O
Gee, Phil, I had to file the same paperwork (okay - on line license
modification) to change my address when I moved, which the FCC does require
one do. The only difference is in whether one checks the box "issue new
call". A new license is issued in any case, right out of the
computer-generated seq
You should be okay, Bill. Note that the GFI does *not* require a working
ground! It only monitors the current flowing in the two sides of the mains
line and, if there's a discrepancy, opens the circuit on the assumption that
the "lost" current might be flowing through you to ground.
I'm not sure
Sometimes turning on the preamplifier makes a world of difference, even when
low threshold is selected. I realize that the preamplifier is not needed on
the lower frequency bands and normally would be turned off to preserve the
dynamic range of the receiver. But this is a case where raising the ove
Dave W7AQK wrote:
I'm about ready to tackle things now though, so maybe
by the weekend I'll have my K3 percolating. It's a strange feeling though
not having to get out the soldering iron!
---
Have fun!
It's okay to fire up the soldering iron! From time to time reach over
Ha, ha!! I can't blame you for not wanting to hear the heterodyne whistles.
In the days when AM blanketed the Ham phone bands, copying a signal often
meant learning to ignore a cacophony of heterodynes!
However, I can say from personal experience that a K3 in SSB mode sounds as
good on AM as most
Bell wire is a twisted pair of plastic coated usually solid copper wire of
about 18 or 20 gauge for low voltage use. At one time it was a standard
hardware store item provided for hooking up a door bell. One needed to run
the wires from the battery or transformer and bell to the button at the
door.
Any filter will produce "ringing" when the bandwidth is too small.
Ringing is a function of the bandwidth and only affected by the type of
filter. In some filter designs it's possible for some elements of the filter
to have such a high Q they ring even though the overall filter bandpass is
not th
Oops I meant to say:
"Ringing is a function of the bandwidth and only SLIGHTLY affected by the
type of filter."
-Original Message-----
From: Ron D'Eau Claire [mailto:[EMAIL PROTECTED]
Sent: Friday, November 30, 2007 8:52 PM
To: 'elecraft@mailman.qth.net'
Subject:
Like most LCD's there is a plastic cover film added by the mfgr, but they
are removed in Aptos.
Looks like a note in the procedure to that effect might be in order .
Ron AC7AC
-Original Message-
I had same issue ... and finally decided there was nothing there and
proceeded ... I _thi
Ed and Simon have it right. You can continue on, as they said, installing
the KPIO3 and selecting KPAio nor in CONFIG:KPA.
There *should* have been a jumper block pre-installed in case you were
building a low power K3. It's required in a low-power K3 to complete the RF
circuit when there's no KPA3
That was about the time it was decided to remove the covers in Aptos to
avoid confusion.
Likely yours had one corner "dog-eared" so it was obvious and easy to
remove. At least that was the plan at one point. Then it was decided nothing
was gained by leaving them in place and it was just as easy t
While most revisions to a new letter involve incorporating the items shown
in the errata, there was an additional major change made between Rev B and
Rev C of the K3 Kit Assembly Manual.
The procedure was reorganized to allow builders with the KPA3 100 watt
amplifier module to install the KPA3 sh
al Message-----
From: Ron D'Eau Claire <[EMAIL PROTECTED]>
To: 'Elecraft Reflector'
Sent: Sat, 1 Dec 2007 8:03 pm
Subject: RE: [Elecraft] Elecraft K3 Support on the Weekends?
While most revisions to a new letter involve incorporating the items
shown
in the errata,
It stops tuning at 500 kHz.
Ron AC7AC
-Original Message-
I see that the K3 receiver is spec'd down to 500 kHz. What about below
that? Is it completely dead (e.g. due to filtering), or is it alive but
with reduced sensitivity, selection, etc.?
Will it even tune below 500 kHz? (I've s
Another Option module that is easier done up during the initial build - even
more so than the KPA3 - is the KXV3 interface module. It's nestled under the
KIO3 interface on the back and requires removing the KIO3 and its two pony
boards from the back to plug it in, and removing the bottom covers to
If you read the step or look at the illustrations you'll see what size screw
to use and exactly where to use PAN heads and FLAT heads.
Mixing up hardware will do more than produce an ugly K3, it can cause short
circuits, bent PC boards and a variety of other not-so-nice situations.
That's why eac
Ian GM3SEK asked:
Are the different types of screws packaged separately in the kit?
---
No, the folks organizing the kit packaged the parts roughly by assembly such
a front panel, KIO3 Interface, etc. The assembly manual illustrated parts
list is broken down to show what
Dave, W7AQK wrote:
If you truly feel that inserting an apostrophe midstream in a
word like "don't" is a pain in the neck, why not just wait until your
message is finished and tack on a bunch of apostrophes at the end. Then the
reader, if so inclined, can go back and insert them as necessary.
Have you calibrated the KPA100 temperature sensor and set the quiescent
bias?
The KPA100 has a self-protection circuit in it that reduces power and
displays the message "PA HOT" if the heat sink temperature exceeds 85C
(185F).
I'm not sure it's possible to get the heat sink that hot in normal us
You've got it Stephen!
As with the others, limiting the power by limiting the audio drive is
preferable. It holds the IMD to a minimum. In any case, you want to avoid an
ALC action with PSK31.
As for isolation: the K3 has fully-isolated audio inputs and outputs ;-)
What isolation gets you is f
Tnx for the feedback, Stewart! The K3 isn't a trivial assembly process, even
though all the boards are pre-assembled and tested. Wayne is an absolute
task master requiring that the assembly procedure be as clear and easy to
follow as possible.
You wrote, "I did actually use my soldering
iron to
Tnx Rod!
10 meters!! What about 6 meters with an XV50 or K3?
Back in the mega-spot cycle of the late 50's, I was an active reservist in
the California Army National Guard assigned to duty as the communications
sergeant in an Armored Infantry company. We used AN/PRC-6 hand-held
transceivers for
Here on the Oregon coast where hurricane force winds are a regular event
several times each winter, our community emergency team relies on Amateur
radio, CB and "Family Radio" for communications.
However, I'd not want to combine them into one rig. That would prevent
simultaneous use by several pe
It doesn't degrade the K3 performance in any way. The KBPF3 simply adds the
right input circuits to maintain full sensitivity across the entire tuning
range.
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Saturday, Dec
Once again SAQ, the wonderful old radio station at Grimeton, Sweden, was on
the air with a Christmas Eve broadcast. This rig is the predecessor of all
of our modern CW rigs, producing clean high-power CW signals back in 1924,
long before vacuum tubes were up to the job.
Unlike the damped waves of
;d be interested since the
page claims to be under their copyright.
Ron AC7AC
-Original Message-
From: Bill W5WVO [mailto:[EMAIL PROTECTED]
Sent: Monday, December 24, 2007 6:57 PM
To: Ron D'Eau Claire; Elecraft e-mail list
Subject: Re: [Elecraft] A Bit of History
Ron D'E
Interesting Dave. Are my lines over-length?
I use MS Outlook, and don't get over-length lines requiring scrolling from
anyone, either in ASCII as we see here on the reflector or in HTML in direct
messages. Outlook automatically wraps text at the edge of the window as
needed for proper display.
Seems like much of the K3 Reflector correspondence,
and even the discussons of K3 Filters, invariably
ignores the SSB mode in the K3. Is the K3, like the
K2, again looked at as a CW contest rig?
Not in the slightest Fred! Not onl
Ha, ha! No "fix". It's a way of generating noise to demonstrate that the
KNB2 is working. It produces the sort of high-impulse, short duration noise
the KNB2 is designed to handle.
A lot of operators note that it doesn't do much for random QRN with fairly
wide pulses at varying intervals. That's
Toby wrote:
Just try and work multi-2 SSB using Heil with the other OP less than 6
feet away "shouting", "NEGATIVE my call is delta delta five foxtrot zulu
denmark denmark one two three four five florida zanzibar ..." I find it
almost impossible.
---
Anyone who
Depends upon which band is "open".
The "WARC" bands (including 17 meters) are great, but the simple truth is
they are not as well populated as the old standbys (10, 15, 20, 40, 80,
160). I think that's due, in part, to the popularity of multi-band coax-fed
antennas. Those antennas that cover the
Clearly Elecraft needs to introduce an adjustable "Whoopee" cushion for your
chair so you can change the air pressure to adjust your height at the
operating desk.
Maybe it can be firmware-controlled based on mode - reaching for mic or
reaching for key - as well as the tuning knob...
Don't hold y
It's good your operators did well, but there's strong evidence their success
was in spite of their voice technique, not because of it.
I based my comments on extensive studies done by military and commercial
services that showed that a raised, strained voice reduces communications
efficiency, esp
The key to being ESD-safe is there being a conductive path between the pins
of any ESD-sensitive part so that all the pins stay at the *same* potential.
That's not always true when the parts are mounted on the pc boards.
When a part is put into the circuit, normally incidental d-c paths are
provi
I find it strange to hear "sidetone" on a phone rig. None of the radios that
I've used professionally do that. It's been almost ten years since I last
operated a commercial system, so maybe things are changing but, if so, it's
very, very new.
Since we sound completely different to ourselves than
Toby wrote:
I suppose it might be a question of definition of what a raised voice is.
I'll never forget the first time I was in a studio during the 6PM news
(actually it was shortly before 7PM) and was very surprised at the
volume which the anchor used to speak. He did not shout (you breath
di
Al, WA6VNN wrote:
I've noticed it's a little on the high side for folks with smaller hands
than I. Aside from that, the viewing angle is ideal, which can be a real
hassle
when its 'flat'.
--
I find that is important to read all the legends on t
Have you run the Transmitter Gain calibration per the Owner's manual on all
bands, first at 5 watts without the KPA3 enabled, then again at 50 watts
with the KPA3 operating? (See Owner's manual, Calibration Procedures).
Ron AC7AC
-Original Message-
I have installed my Xmas present the K
Since I unleashed this discussion yesterday, I've had a lot of interesting
and enjoyable off-list correspondence that, I believe, uncovered the issue.
When I last worked in non-Amateur voice communications over a decade ago,
headphones weren't common unless one was in a very noisy environment suc
Do you have any error messages when running the Synthesizer calibration?
(Owner's manual, Calibration Procedures, Synthesizer)
If the synthesizer is out of lock, the receiver will still produce some
noise and possibly what sounds like signals. But it'll be way off frequency,
which would explain th
IN spite of all the K3 hoopla here, the K2 is a GREAT rig. You'll have lots
of fun with it!
Ron AC7AC
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Hans
Sent: Sunday, December 30, 2007 10:15 AM
To: Elecraft
Subject: [Elecraft] K2 # 6332 ALIVE
Hi All,
Mine with the current firmware takes 3.7 seconds from power on, measured by
a stopwatch. At that point I'm hearing the signals so the DSP is fully
operational as well
Now, if I could find a PC that boots that fast (no, not even an Apple beats
that...)
Ron AC7AC
-Original Message-
From:
Such a low dipole will normally have, at its center, an impedance in the
general range of 4-j60 ohms at 7 MHz, so the "r" value you're seeing doesn't
seem surprising.
For all practical purposes it's "on" the ground and the earth has a very
large effect on its impedance and its resonant frequency.
160 meters has been good for contacts from Oregon to Hawaii or the Atlantic
coast recently. I'm using a 100-foot Inverted L working against ground.
Ron AC7AC
-Original Message-
Last night I was able to work Colorado from my location not too far West of
you. Twenty meters should work int
By golly Fred, that message displayed just fine here, either in MS Outlook
or using a simple text reader like Notepad.
Ron AC7AC
-Original Message-
Larry
WD4MBE
You reflector post - is like 5 lines, and each line
is a couple hundred characters wide. It makes for
very poor email posting.
Okay. Outlook just calls it "plain text" (no formatting for lines or fonts).
It's a VERY common format and generally preferred since it allows the
reader's computer do the wrapping.
Looking at the QTH.NET archives, I see the same thing, but it's no longer
the same format the e-mail sender posted.
It looks fine here on MS Outlook, either way Joe.
The issue raised by the originator of this thread was NOT about how the text
displays in e-mail programs, although some do apparently lack the ability to
properly wrap ASCII text to fit screens.
The issue raised was that reading messages in a WE
Rick wrote:
>>Of course the audible zero-beat method works
>> fine too, but there is always the possibility of confusion about whether
>> one is zeroing the carrier or one of the transmitted tones.
I haven't had a problem with the WWV tones. I first zero on WWV, then wait
for the announcement th
I have found that a touch with a "permanent" black marker pen does the job
beautifully.
(What? Me scratch my K3? N...) Actually, my K3 has been
assembled and disassembled probably more often than any single unit in
existence: from fully assembled to fully disassembled at least 20
I've had that happen to me in a CW rag chew a few times. They other guy
catches the 'craft' and jumps to a conclusion, then usually comments that he
always enjoys working guys with antique rigs.
I resist the temptation to say I enjoy working guys with antique ears.
As my daddy always said, "He
We're back to wanting our RF "superconductor" again .
First, to add a note to the original question, it's useful to think of the
RF field as flowing OVER the outside of the conductor, so a helix (coil) or
any form of zig-zag arrangement of wires simply look like fat conductors to
the RF field. In
That's a "linearly loaded" doublet. The zig-zag provides a little more
inductive reactance to help offset the capacitive reactance caused by the
overall length being short. Studies suggest that the resistive losses in the
wire is somewhat less using the "zig zag" than using loading coils each side
David wrote:
I'm also fairly sure that the amount of wire to wind on the helix is
significantly different from the amount that would be used in a straight
line. My gut feeling is that it should be less, but I haven't
researched that, either,
-
I have experimented with cont
Ha, ha! Check the date on the article.
VK5BR has a parallel tuned circuit (two plates for the capacitor and coil
for the inductance) with the "feed" tapped across a couple of turns of the
coil.
One could use any parallel coil/capacitor combination with adequate voltage
and current ratings to do
John wrote:
b) The antenna will convert a portion of the applied AC voltage and current
into heat energy as a result of resistive losses in the antenna structure.
Unless steel or nichrome wire is used, or electrically poor connections
exist in the antenna structure, losses due to (b) will be low.
I'd go "mobile" Bill. Like an automobile (at least when they had significant
metal), the frame of your trailer will provide capacitive coupling to ground
and you can use a short, loaded vertical "mobile antenna" such as sold for
use on automobiles.
It will be a very inefficient antenna, compared
Absolutely pattern is of significance, Alan, but unless you have a lot of
space, there's not much one can do about the pattern of HF antennas and most
wire antennas will be omni directional at heights most Hams can achieve on
typical lots.
Even a full-sized 1/2 wave horizontal antenna is essentia
It's very hard to say, Jim, because that sort of antenna will show a huge
range of possible impedance values at the transmitter depending upon the
feeder length. An unmatched feeder like that acts as an impedance
transformer based on its length. That's why you so often see comments like
"change the
Aaargh
Ron AC7AC
-Original Message-
I prefer this, very educational: http://www.youtube.com/watch?v=_lmgNqFuXwc
Simon Brown, HB9DRV
-
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to th
Hi, Tony:
I built my K2, SN 1289, in 1980 and have thoroughly enjoyed it ever since. I
was first licensed in 1952 and have always had an HF transmitter I built
myself, either from a kit or scratch. I was about to give up and go after my
first "factory built" rig when I ran into a guy using a K2 o
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