Re: [Elecraft] 75 ohm coax

[Don Sanders]

I have used TV RG6 for over 30 years. Usually 50 feet or less and it
handled the output of my SB200 amp well. In Ecuador that was the only coax
readily available and it worked well. I recently bought a roll of 250 feet
at Walmart for $30. Checked the loss of 100 feet and was about 1.5 dB at
145 MHz. Not as good as open wire feedline but for coax very workable.
Cannot beat the price.
I also have used the  "F" connectors up to about 600 watts with no problem
and now find BNC conn at Home Depot made for RG6 Coax. There is a lot of
discussion about using RG6, usually from those who have not used it but
have heard it is not good. It is definitely better than RG174 but heavier.
I have been fortunate to have found good RG6 but I always test it before
use. It works well in an ugly balun also at HF. I usually use the 25 foot
lengths found already made with connectors on each end. I have used two
runs in parallel, center conductors of course, to feed a doublet for
multiband HF. 50 feet lengths feed my 6 and 2 meter verticals.
Dr. Don W4BWS

God Bless All
Ham Radio does not make the world go round.
Ham Radio is what makes the ride worthwhile.


On Wed, Apr 1, 2020 at 9:38 PM Don Wilhelm  wrote:

> The voltage allowable on 75 ohm 1/2 inch hardline far exceeds the
> voltage allowable for RG-213.  No problem at the limit of 1500 watts for
> the ham bands.
>
> Even RG-6 will withstand 1500 watts with no problems.
>
> 73,
> Don W3FPR
>
> On 4/1/2020 4:38 PM, Gmail wrote:
> > Careful, 75 ohms  was picked for cable TV receiving Coax because it was
> lower loss then 50 ohms but it could not handle high power as 50 ohms
> could.  50 ohms is a power, loss compromise. 35 ohms For high power high
> loss,  50 ohms compromise, 75 ohms low loss low power.
> > Ray
> > W8LYJ
> >
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Re: [Elecraft] Measuring SWR (Long)

[Don Sanders]

Since no one has answered your question. I will venture a
supposition that many know but few will speak out.
And some still remember their CB days and the erroneous
advertising saying the power is lost.
Reflected Power flows back down the feed line and is subjected
to the normal feed line loss. It then is "reflected" back toward the
antenna, again subject to the feed line loss, where some of it is
radiated and some reflected again.
This continues until the power is dissipated. The book "Reflections"
 has a very good but somewhat technical explanation.
Therein also is the reference to forgetting about striving for the
"Holy Grail" of 1:1 SWR.
And concentrating on getting it low enough that the transmitter will
supply full power output. Also using the best low loss feed line and
proper matching when possible of the feed line to the antenna.

Dr. Don W4BWS

God Bless All
Ham Radio does not make the world go round.
Ham Radio is what makes the ride worthwhile.


On Tue, Apr 9, 2019 at 6:43 PM Roy Koeppe  wrote:

> "...Let's allow the reflected power to increase all the way to  10
> watts! At that point, your SWR would be about 2 to 1. Sounds pretty bad,
> but
> surely if you were stranded in the desert and had to use your KX3 and a
> wire
> to get help, you'd be happy to have a match this good...(etc.)"
>
>
> From memory now, at 2 to 1...feedline voltage nodes and current nodes can
> double -- no small thing when power is 1500 watts; can stress antenna
> system
> components.
>
> 73,   RoyK6XK
>
>
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[Elecraft] Fwd: Fw: Did you ever?-- these days!

[Don Sanders]

Dr. Don W4BWS

God Bless All

Remember the reason for the season

*Subject:* *Did you ever?--  these days!*


*Please accept, with no obligation implied or implicit, my best wishes for
an environmentally conscious, socially responsible, low-stress,
non-addictive, gender-neutral celebration of the Winter Solstice Holiday.*









*Please practice it within the most enjoyable traditions of the religious
persuasion or secular practices of your choice, with respect for the
religious/secular persuasion and/or traditions of others, or their choice
not to practice religious or secular traditions at all.I also wish you a
fiscally successful, personally fulfilling and medically uncomplicated
recognition of the onset of the generally accepted Calendar Year 2019, but
not without due respect for the calendars of choice of other cultures whose
contributions to society have helped make America great.  Not to imply that
America is necessarily greater than any other country, nor the only America
in the Western Hemisphere. Also, this wish is made without regard to the
race, creed, color, age, physical ability, religious faith or sexual
preference of the wish.Best wishes from your right-wing, extremist,
deplorable independent American patriot.*
*What ever- MerryChristmas *
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Re: [Elecraft] Less Than Perfect Antennas

[Don Sanders]

While in Ecuador I tried this skeleton discone. Did not work well.
Actually I had to extend the lower wires from formulas by about 30 %
to get a low <3 swr at design freq, 40 meters. I did not try adding more
wires.
I had several good antennas I made so I did not do further investigations.
Dr. Don W4BWS




On Fri, Dec 7, 2018 at 5:30 PM Charlie T  wrote:

> I wonder if anyone has ever tried, for want of a better name, a "Skeleton
> Cone" which consists of a single horizontal wire connected to the coax
> center conductor and two sloping wires at 45 degrees, in the same plane
> connected to the coax shield.  A true Discone antenna would have many
> (typically eight each) horizontal and sloping elements. I'm guessing many
> of us have used the VHF/UHF version for very wide band coverage, for
> example 144, 220, 432 MHz and even higher.  I know I have one up and it
> performs as well as a regular single band  ¼λ ground plane (unity gain)
> on all three bands with low SWR.  The ICOM version as well as a few others,
> also have a loaded whip for 52 MHz mounted on the bushing that the
> horizontal elements are screwed into.
>
> I'm also guessing the formulas for a true Discone would work for a
> "skeleton" style as well.  I Since it is inherently a wide band design, the
> actual lengths are probably not too critical.  I've heard this type antenna
> described, but I don't remember where or how well it supposedly worked.  It
> obviously requires two supports, high enough that the sloping wires ends
> are off the ground by a bit.
>
> 73, Charlie k3ICH
>
>
>
>
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Re: [Elecraft] Less Than Perfect Antennas [was Flumoxed]

[Don Sanders]

As Don has said, a good dipole as high as possible, even in an attic, fed
with balanced line will out perform most other compromise multiband
antennas.
While being retired in Ecuador I had the advantage to try several antennas.
The best over all was a fan dipole for 40, 30, 20,and 17 fed with RG6 up 80
feet AGL mounted on 30 foot bamboo poles at the top of a hill. Next was an
88 foot inverted L fed with 300 ohm line, then two RG6 coaxes, then
homemade open line. The horizontal sloped from the 33 foot peak to a 20
foot pvc mast. I noted no real difference with either feed line.

I also mounted the 88 footer with 66 feet in a slight vee from 33 feet peak
to 20 foot supports for the ends and 11 feet vertical at each end. This
also worked well all bands about as well as the inv L. I easily worked
Europe Asia, South Africa, eastern and asiatic Russia with QRP or 80 watts.
This was a test to see if an 80 meter ant could be installed in a limited
space as many homes in Ecuador have lots that are small.
While any antenna is better than no antenna, effort should be made to have
the best antenna possible. Wire antennas are simple, economical and easy
for most hams to iinstall.
Dr. Don W4BWS
EX-HC4/W4BWS




On Thu, Dec 6, 2018 at 9:58 AM Don Wilhelm  wrote:

> That statement is true - however ---
> The problem is not radiation from the conductor, but how to get the RF
> current into the conductor and not in other unintended places.
>
> For those who want to build their own antennas, I suggest starting with
> a resonant dipole fed in the center.  That provides a good match for 50
> ohm coax, and a good current mode choke (balun) at the feedpoint keeps
> RF from flowing back onto the outer shield of the coax which can create
> a lot of RF in the Shack.
>
> Off Center Fed, and End Fed antennas can be made to work with more care.
>   The feedpoint impedance does not match coax, and special care must be
> used to keep the RF on the radiator rather than coming back into the shack.
> I realize that OCF and End-Fed non-resonant antennas are popular because
> they can be used on multiple bands, but there are problems feeding them
> while keeping the RF on the radiator and not in unintended places such
> as the shack.
>
> For those who want multiband operation, I still suggest a center fed
> radiator fed with open wire or ladder-line to a good current mode choke
> balun at transition point to coax is a better choice than OCF or end-fed
> antennas - keep the coax short and use a tuner that can match the
> resulting impedance.
> Make the length of the dipole approximately the length of a half-wave at
> the lowest operating frequency desired.  It will be more "tame" for RF
> in the Shack than many OCF or End-fed antennas.
>
> 73,
> Don W3FPR
>
>
> On 12/6/2018 8:56 AM, ANDY DURBIN wrote:
> > "RF current into a conductor will radiate, even if it's at eye level."
> >
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[Elecraft] QRP Multimeter

[Don Sanders]

For those who are not able to go to Harbor Freight and need a small
multimeter at a QRP price.
Check this out:
https://www.aliexpress.com/item/1-Piece-DT-832-Digital-LCD-Voltmeter-Ammeter-Ohm-Tester-Multimeter-Buzzer-Diagnostic-tool-VEH58/32863880413.html?spm=2114.11010108.06001.48.650c649bwFwqVB=5347592=1007.13562.105726.0_id=1007.13562.105726.0=1007.13562.105726.0=9e4a87b1-ee27-4dfb-ab6c-ed859a846f77

Dr. Don W4BWS

Ham Radio may not make the world go around.

Ham Radio just makes the voyage more enjoyable.
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Re: [Elecraft] OT: shipper from H

[Don Sanders]

Even when you move and give all the needed documentation for forwarding
the USPS screws up. I've had three items returned as undeliverable and
yesterday
was notified by Amazon that my item was delivered and held by the post
office for
7 days and to arrange for pickup.
Upon contacting the PO by phone They checked the tracking number and
informed
me they delivered it to the former address the previous day. My wife
checked our
mail box and, guess?, YUP it was in our PO box not the former address.
And the PO wants a price increase for their Obvious(?) great service.

Dr. Don W4BWS



On Thu, Apr 19, 2018 at 3:40 PM, Edward R Cole  wrote:

> hopefully topic will pass political correction police.
>
> Recent order of a Yamaha CM500 from Amazon.com got "Lost in space".
>
> Well actually their compooter substituted another city for mine and sent
> it there, where all tracking failed.  Fortunately I noticed it was
> "delivery attempted" after a week of waiting delivery and I complained to
> Amazon who refunded my purchase of $58.33.  I checked the order at amazon
> on-line and it properly listed Nikiski.  But the package was addressed to
> Kenai with the Nikiski zip code.  This is not the first time amazon screwed
> up.
>
> I ordered again listing this time the physical address of my PO (which I
> have permission to do).  Not only USPS but UPS and FedEx shipments can
> accepted (for me) by my local PO.  This a nice cure for "drop n scoot"
> delivery by later two shippers.
>
> Even when I use "click-n-ship" for prepaid packages mailed thru the USPS,
> the USPS Internet site changes my address town and zipcode to Kenai
> 99611-5074 (???).  Fortunately this is only the return address.  I can try
> to correct the address before printing my labels but the USPS compooter
> just changes it back.  So no win.  Hopefully, none of my shipments are
> returned (to the wrong city and zipcode).
>
> Of course it knows more than the hooman that wrote it.  I guess another
> evil like "auto-fill" and "auto-correct"?
>
> 73, Ed - KL7UW
>   http://www.kl7uw.com
> Dubus-NA Business mail:
>   dubus...@gmail.com
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Re: [Elecraft] Art of Electronics

[Don Sanders]

Thanks for the like for the free 2nd edition.

I know many regard math as difficult, but a book I used when teaching at
Valparaiso Tech Institute was "Basic Math for Electronics by Nelson M.
Cooke.

It taught math by using many electronics formulas and therefore was
invaluable to help students learn electronics and basic math.
I believe the latest is the 7th edition. But I used the first edition.

I will have to look for a free download.

Dr. Don W4BWS




On Sun, Apr 8, 2018 at 11:14 AM, Mike Markowski 
wrote:

> Chuck and all,
>
> It really is a great book, the best I've found on the topic for my style
> of learning.  I really like math but also need concrete examples.  I like
> their approach of "here's how we might approach this," leading to
> shortcomings, to how to improve, etc.  Very methodical rather than jumping
> straight into the best solution without knowing where the model came from.
>
> In general, I find electronics learning - or really, learning anything -
> to be iterative.  I'd take the math class, then the EE and understand
> some.  As more math or EE clicked I'd understand the other a little
> better.  And so on.  At long last, I'm ready to compete with those kids who
> skated through university effortlessly...as retirement is only a decade
> away!  Better late than never.  :-)
>
> 73,
> Mike ab3ap
>
> On 04/07/2018 07:17 PM, hawley, charles j jr wrote:
>
>> That’s a great book, “The Art of Electronics”. Horowitz and Hill, Harvard
>> and Rowland institute for Science. Interesting about the math. I learned
>> the math, though, in EE courses and found that to be a plus. Math with an
>> application.
>> Seemed like I was always taking the math course after I learned the math
>> the semester before in an EE course.
>> Anyway, I bought the book when I was already on the job and it was a
>> great source of ideas and understanding.
>> Chuck
>> KE9UW
>>
>> Sent from my iPhone, cjack
>>
>> On Apr 7, 2018, at 3:35 PM, Mike Markowski  wrote:
>>>
>>> Many thanks to everyone who responded!  I have a clearer understanding
>>> now.
>>>
>>> It reminds me of my own EE student days.  I found learning electronics
>>> challenging because our texts started with math and the useful properties
>>> of this or that circuit kind of fell out as a side effect or mini-miracle.
>>> Then I discovered the text 'The Art of Electronics' which approached it
>>> from a different angle and things clicked much more naturally for me.
>>>
>>> I like Skip K6DGW's description of the two approaches to Elecraft as
>>> orthogonal.  So I think I get it.  Thanks, all!
>>>
>>> 73,
>>> Mike ab3ap
>>>
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Re: [Elecraft] Long wire antennas MORE

[Don Sanders]

A
​ Rose by any other name is still a Rose.​
​Isn't Semantics fun?​


On Sat, Jan 13, 2018 at 1:37 PM, David Gilbert 
wrote:

>
>
> Calling it a counterpoise is a misnomer.
>
> Dave   AB7E
>
>
>
>
>>
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Re: [Elecraft] USB Charger from KX3 Battery

[Don Sanders]

Lots of info on Google and Amazon has 5 pieces for about $6, free shipping

Dr. Don W4BWS

On Thu, Nov 30, 2017 at 12:24 PM, K9MA  wrote:

> I'm planning to take the KX2 on a long trip, and it occurred to me that it
> might be useful to be able to charge my phone from its battery.  I just
> took apart a cheap automobile charger and wired a socket to its input.  It
> works down to about 8 V.  You could build your own, but at $3 it's hard to
> beat.  If weight weren't an issue, you could just make an adapter from the
> battery plug to a cigarette lighter socket.
>
> If you really want to build your own, look at the data sheet for the
> MC34063A.
>
> 73,
>
> Scott K9MA
>
> --
> Scott  K9MA
>
> k...@sdellington.us
>
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Re: [Elecraft] [KX3] Reminder: CQ WW CW is happening now

[Don Sanders]

This is great advice. Particularly on Sunday as the participants are hungry
for new contacts.

Additionally, I found the 40 meter CW freqs so packed that contacts for
non-contesters almost impossible.
However, the 7.1 to 7.122 MHz region was open. I had several contacts there
with SKCC and other stations.
I suggest that perhaps every weekend, particularly when there is a contest
and you find the normal QRP/SKCC
freqs overloaded, perhaps you should move up to the old Novice band. It was
a pleasure to chat there and I
heard several stations in QSO.
I'll be looking for contacts there.

73,72

Dr. Don W4BWS

On Sat, Nov 25, 2017 at 11:46 AM, Wayne Burdick n...@elecraft.com [KX3] <
kx3-nore...@yahoogroups.com> wrote:

>
>
> This is a great opportunity to work some DX (regardless of power level)
> and see what CW sounds like with hundreds of signals on the band. Have fun!
>
> Wayne
> N6KR
>
> __._,_.___
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Re: [Elecraft] Question for Wayne about your OCF Dipole

[Don Sanders]

So not much different than the G5RV with parallel feed line all the way to
the tuner, no coax.
Just fed off center at the 39% or 61% point instead of center fed.
I wonder about losses in the tuner due to the imbalance but not having
tested it I hold any judgement.
Several articles in the literature of similar OCF antennas fed with
parallel line.
Basically all are non-resonant, so no worries about resonance on higher
bands as with OCF , balun,coax fed antennas.

I used a 88 foot center fed with 2 lengths of RG 6 coax similar to what you
are using.
From Ecuador I worked the world with QRP 40 to 10 meters and with 50 to 100
watts on 80.
Yes, a good antenna. I center fed it due to worries about loss in baluns
with OCF antennas and the lack of commercial balanced line. Just a little
loss from the RG6.

Dr. Don W4BWS
​SKCC 81C
K2 SN 163​


On Mon, Sep 18, 2017 at 6:02 PM, Wayne Burdick  wrote:

> Hi Marv,
>
> I didn’t measure the legs. My best guess, standing here by the shack
> window using an antique brass monocular, is 55’ on one side, 35’ on the
> other. This is the most satisfying thing about off-center-fed dipoles:
> length generally isn’t critical. Close your eyes and clip, knowing that,
> most likely, the ATU will do the rest.
>
> The installation was opportunistic, taking advantage of a back yard
> gazebo, a Home Depot telescoping pool-cleaning pole, and a huge white oak.
> Height at each end was determined by how high my son was able to climb
> without the neighbors noticing.
>
> The experimental feedline, running under the house for half its length,
> was more deliberate if not justified in the literature. At first I was
> using 300 ohm mystery twin-lead scavenged from an installation of yore. But
> given all the RFI sources I decided to try two lengths of LMR-400, taped
> together every few feet, forming a sortof-balanced-shielded feed. Purists I
> consulted ahead of time continue to be shocked at how well this works. At
> the mast, the grounds are left unterminated. In the shack, the two center
> conductors go to an Elecraft BL2 balun. The shields are soldered together
> and connected to the BL2’s ground lug.
>
> There you have it: Wide tuning range, low noise, low-loss, and
> theory-free. How it works is left as an exercise for the reader.
>
> Wayne
> N6KR
>
>
>
> > On Sep 18, 2017, at 2:31 PM,  <
> marvwhee...@nwlink.com> wrote:
> >
> > Wayne:
> >
> >
> >
> > In a previous post you mentioned your 90 feet long OCF dipole. Would you
> > please elaborate on your antenna? Balun, leg lengths, how fed?
> >
> >
> >
> > Thanks,
> >
> > Marv
> >
> > KG7V
>
>
>
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Re: [Elecraft] HF Antennas for KX3 Hand-Held/Hiking/Portable?

[Don Sanders]

I haven't tried this with the MFJ whips. I used to have a 20 meter ham
stick and by removing the metal whip the antenna resonated near 11 meters.
By installing separate metal whips for 17 and 15 I had a 3 band whip
antenna. So someone with a MFJ wjip may want to try this idea.

Dr. Don W4BWS

On Thu, May 18, 2017 at 10:10 PM, Jan Timmers  wrote:

> Some people have suggested this item from MFJ will do the trick.
>
> http://www.mfjenterprises.com/Product.php?productid=MFJ-1620T is for 20m.
> They also have another for 17m.
>
> On Thu, May 18, 2017 at 3:41 PM, Chas H <2mysys...@gmail.com> wrote:
>
> > I am looking for HF antenna options (primarily 17m + 20m) that will work
> > for hand-held portable while hiking with my KX3.  Preferable something
> that
> > will connect directly to the BNC jack on the side of the radio.  I'll be
> > hiking for 6 days in Glacier National Park and looking for practical
> > antennas to use.
> >
> > What are you using when you go HF hand-held?  Do you drag a counterpoise
> as
> > well?
> >
> > Thanks + 73,
> > Charlie de K0CKH
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> >
>
>
>
> --
> Regards;
> John Timmers
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