Re: [Elecraft] Insurance

[Eric Garner]

I'll also chime in about ARRL insurance. I had my backpack with my HT in it
stolen out of my car. When I filed a claim, they just asked for a copy of
the police report and it was done. Super easy.

The other nice thing is that you can set your own replacement cost for your
radio. Since my HT was a TH-D72a, replacement cost is higher than the
original purchase price, and I could adjust that each year when the policy
was up for renewal.

Eric
KI7LTT

On Sun, Jul 21, 2024, 6:12 AM Mike Dodd  wrote:

> On 7/20/2024 11:36 PM, Mike Dodd wrote:
> > last year a nearby lightning strike damaged the USB port on my K4. My
> > insurance paid the $350 Elecraft repair cost and the ~$60 shipping both
> > ways. There was a $50 deductible
>
> Two minor corrections: The Elecraft repair invoice was $450, not $350,
> and the deductible was $25, not $50. The insurance check was for $425.
>
> I see on the ARRL insurance website that the deductible has increased to
> $50 since my claim was paid in December 2023.
>
> 73, Mike N4CF
>
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Re: [Elecraft] Parts availability

[Eric Garner]

If you email elecraft support they can tell you if they have any in stock.
The last time I needed a part for my KX3 they didn't have any, but gave me
the Mouser part number so I could get it my self.

Eric KI7LTT

On Sat, Apr 13, 2024, 7:14 PM Chris  wrote:

> Hello,
>
> I am looking for E620021 and E620044 parts to make voltage and frequency
> probes.  Does anyone know where I can buy them from a third-party
> supplier?  Are they available from Elecraft?
>
> Many thanks,
>
> Chris KM1B
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Re: [Elecraft] Astron RS-35M Hum

[Eric Garner]

I did the same, but also added chunks of Dynamat to the inside of the
chassis. I got a small quantity of Dynamat as off-cuts from a local car
stereo shop.

Eric KI7LTT

On Fri, Sep 29, 2023 at 2:12 PM Steve Lawrence via Elecraft <
elecraft@mailman.qth.net> wrote:

> Astron RS-35M Hum (and probably other Astrons).
>
> I've found some posts in the archives related to this topic so perhaps a
> bit OT but hopefully of general interest.
>
> My Astron RS35M developed a hum that increased with increased load.
> Otherwise working OK but became annoyingly loud.
>
> My solution was to insert a round rubber pad at each of the four mounting
> screws between the chassis and the transformer.
>
> 3/4" OD x 1/4" ID x 1/8 inch thick.
>
> https://www.amazon.com/dp/B0BJPF9QMZ
>
> The hum now is very low. Nothing that would otherwise stand out if I
> weren't listening for it. And it does not change with load or increased
> load.
>
> So the problem seems to be mechanical coupling between the transformer and
> the chassis with the hum amplified when the cover is on the PS. Likely
> varies with any given batch of transformers. My much older RS-35M exhibits
> no hum at all even under load.
>
> 73 - Steve WB6RSE
>
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Re: [Elecraft] A Good Headset For A K3

[Eric Garner]

2nding the radiosport headsets. They are not cheap, but they are
comfortable for extended wear, sound great, and block nearly all background
noise.

Eric KI7LTT

On Sun, Aug 6, 2023, 11:30 AM Lou Laderman via Elecraft <
elecraft@mailman.qth.net> wrote:

> I prefer RadioSport boom headsets. Others the Yamaha cm500 (I believe
> that’s the model). Both are worth looking at, cost is very different.
>
> 73, Lou W0FK
>
> Lou Laderman
> (314) 308-4363
> Sent from my mobile device
>
> On Aug 6, 2023, at 11:37 AM, Eric Fitzgerald  wrote:
>
> Hello Elecrafters,
>
> I've been struggling with a failing Kenwood MC-60 desk mic for portable
> operation and I would like recommendations for a good, robust headset that
> plugs into the front panel jack.
>
> Thanks in advance for that,
>
> 73 Eric KG6MZS
>
> PS; I tried to search the Mailman archives for this and couldn't find the
> search field.  Did it change recently?
>
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Re: [Elecraft] Signal source for KX3 temperature frequency calibration

[Eric Garner]

I have an XG50 that you are welcome to borrow for the price of postage.

Eric KI7LTT

On Tue, Jun 13, 2023 at 9:11 AM Bill Adams  wrote:

>
> The XG50 signal generator is no longer available and I’m in need of a
> stable signal to do the extended temperature compensation procedure on my
> KX3. I remember a discussion about using the K3’s external converter output
> but cannot locate any details.
>
> Any suggestions?
>
> Bill
> AF4B
> Sent from my iPhone
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[Elecraft] MH3 Mike available

[Eric Garner]

If the lack of an MH3 I'd preventing someone from using their KX line
device, I have one that never gets used. If someone is interested in
borrowing it (you pay postage) until they get theirs please contact me OFF
LIST.

Eric KI7LTT
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Re: [Elecraft] KX3 and Heatsink

[Eric Garner]

When you say " Elecraft-supplied heat sink" do you just mean the
little heat spreader plate?

The factory provided thermal solution is totally fine unless you want to
run high duty cycle modes at full power. I have the proaudio ultimate (
https://proaudioeng.com/pae-kx32-ultimate-heatsink-kit-elecraft-kx3/) on
mine and have no complaints.

Eric KI7LTT


On Mon, Jun 13, 2022 at 1:54 PM Bill Lederer  wrote:

> Folks:
>
> I have a recently-purchased KX3 that includes the Elecraft-supplied heat
> sink.
>
> Is there any opinion of this does an adequate job compared to the ProAudio
> one?
>
> Thanks,
> --
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Re: [Elecraft] KX3 Option Advice Wanted

[Eric Garner]

I have a KX3 fully loaded (KXFL3, KXAT3, KXBC3, KX3-2M) the only one I
would skip if I had to do it over is the KXBC3. The NiMH batteries just
don't have the oomph to justify adding them for me and having the RTC
doesn't really matter to me, your needs might be different. I just use an
external LiFePO4 pack for power.
The Pro Audio Engineering heatsink addon (
https://proaudioeng.com/oos-pae-kx32-ultimate-heatsink-kit-elecraft-kx3/)
is nice if you will be running digimodes without an external amplifier.

Eric KI7LTT

On Mon, May 2, 2022 at 9:31 AM Glen Reid  wrote:

> I am contemplating the purchase of a KX3.  Looking for input from users on
> which options I should consider.
> Thanks es 73
> gr
> K5FX
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Re: [Elecraft] RPN Calc App For Android

[Eric Garner]

I use Droid48. It's a pretty faithful recreation of the HP48 and has a
pocket calculator style interface too (but it's still RPN)

https://play.google.com/store/apps/details?id=org.ab.x48

Eric KI7LTT

On Fri, Jan 28, 2022, 12:51 PM Jim Brown  wrote:

> The HP41 emulator I've used for years on older phones isn't compatible
> with my new one. I still own a few simple RPN calcs, but the phone is
> always in my pocket. Recommendations?
>
> Thanks and 73, Jim K9YC
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Re: [Elecraft] Cleaning Solder Flux, Redux

[Eric Garner]

>The only reason for removing flux is purely cosmetic

That isn't accurate. Even modern no-clean fluxes can cause corrosion and
current leakage if left in place under certain conditions If leakage is a
concern, you can specify a surface resistivity level and the boards can be
ultrasonic washed or double DI washed to meet that criteria.

Eric KI7LTT

On Sat, Jan 1, 2022, 11:16 AM Alan Bloom  wrote:

> Another problem with cleaning flux is ionic contamination.  The
> activator in the flux, which is necessary to get the solder to stick, is
> acidic.  As long as the flux is left alone, the ionic contamination is
> trapped in the rosin where it can do no harm.  But when you dissolve it
> with alcohol or another solvent is is spread over the surface of the
> board, unless you do a VERY thorough job of cleaning it off.  That can
> cause electrical leakage between circuit nodes and potentially corrosion.
>
> The only reason for removing flux is purely cosmetic.  When I was at
> HP/Agilent the rule in production and service was that any flux
> remaining on the board due to re-work or repair was just left in place.
>
> Alan N1AL
>
>
> On 1/1/2022 3:25 AM, CUTTER DAVID via Elecraft wrote:
> > Ted
> > If the residue is clear, don't bother, you might create more damage than
> you realise (ESD).  If the residue is brown, you've been using the wrong
> solder.  If you really feel the desire for aesthetics then you can can
> brush it with IPA, but beware ESD if there are sensitive components on
> board.  Also beware some components can dissolve in some cleaners, eg old
> style polystyrene capacitors.
> >
> > 73 and HNY
> > David G3UNA
> >
> >> On 31 December 2021 at 20:52 eda...@aya.yale.edu wrote:
> >>
> >>
> >>
> >>
> >> Is there a consensus among builders of the traditional kits (K1, K2,
> etc)
> >> about the best way to remove solder flux from a completed circuit board?
> >> Some Internet sites recommend acetone, others say isopropyl alcohol. A
> few
> >> tout their own product without saying exactly what it is.  I remember
> >> reading someplace that one or the other of those will clean the flux but
> >> could also cause damage by being absorbed into components.  Yes, I know
> this
> >> is all purely cosmetic but if it can be done safely I'd like to try it
> on
> >> the next kit.  Suggestions?
> >>
> >>
> >>
> >> Thanks,
> >>
> >>
> >>
> >> Ted, KN1CBR
> >>
> >>
> >>
> >> __
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Re: [Elecraft] [POSSIBLE SPAM] Cleaning Solder Flux, Redux

[Eric Garner]

Depends on what flux was used. The current crop of "no clean" fluxes does
not come off well with isopropyl alcohol and leaves a white film on the
board. Other fluxes dont have this problem.

I use the same stuff we use at work for light rework which is the heavy
duty flux remover from MG Chemical.

 Acetone will eat some types of plastic and should be avoided.

Eric KI7LTT

On Fri, Dec 31, 2021, 3:03 PM Harlan Sherriff via Elecraft <
elecraft@mailman.qth.net> wrote:

> I supervised a Metrology lab at a commercial nuclear power plant for 34
> years. We also performed component level repair to “safety related”
> equipment. We used isopropanol applied with a stiff “acid” brush (cut the
> bristles short). Never had a problem with NRC audits.
> That being said, if you ever work on a board that is humidity sealed
> (plastic type coating on solder side), be very careful as the alcohol will
> loosen the coating and it will do a number on unsealed potentiometers and
> switches!
>
> Harlan
> K4HES
>
> Sent from my iPhone
>
> > On Dec 31, 2021, at 4:38 PM, Dr. William J. Schmidt 
> wrote:
> >
> > Professionals use 91% Isopropanol.  You can get it at CVS cheap.
> >
> >
> > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
> PJ2/K9HZ
> > VP2EHZ
> >
> >
> >
> > -Original Message-
> > From: elecraft-boun...@mailman.qth.net 
> On
> > Behalf Of eda...@aya.yale.edu
> > Sent: Friday, December 31, 2021 2:53 PM
> > To: elecraft@mailman.qth.net
> > Subject: [POSSIBLE SPAM] [Elecraft] Cleaning Solder Flux, Redux
> >
> >
> >
> > Is there a consensus among builders of the traditional kits (K1, K2, etc)
> > about the best way to remove solder flux from a completed circuit board?
> > Some Internet sites recommend acetone, others say isopropyl alcohol. A
> few
> > tout their own product without saying exactly what it is.  I remember
> > reading someplace that one or the other of those will clean the flux but
> > could also cause damage by being absorbed into components.  Yes, I know
> this
> > is all purely cosmetic but if it can be done safely I'd like to try it on
> > the next kit.  Suggestions?
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Ted, KN1CBR
> >
> >
> >
> > __
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> > delivered to b...@wjschmidt.com
> >
> >
> > --
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Re: [Elecraft] Temperature or Warmth of KPA500 when "Off" ?

[Eric Garner]

220V PDUs (fancy outlet strips) are common in data centers. They even make
them with remote monitoring and metering. CyberPower is a popular brand
https://www.cyberpowersystems.com/products/pdu/

Eric KI7LTT

On Thu, Jul 1, 2021 at 12:10 PM George Thornton <
gthorn...@thorntonmostullaw.com> wrote:

> Check electrical codes.  I don't believe a power strip for 220 is legal
> under the electrical code.  Too much power.
>
> Concur that you can build an on/off switch to control the outlet.
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> On Behalf Of Ken Winterling
> Sent: Thursday, July 1, 2021 11:26 AM
> To: John Nicholson 
> Cc: Elecraft Reflector 
> Subject: Re: [Elecraft] Temperature or Warmth of KPA500 when "Off" ?
>
> John,
>
> You could build a 220/240V outlet with a remote switch using a couple
> electrical boxes.
>
> Ken
> WA2LBI
>
>
>
>
>
> On Thu, Jul 1, 2021 at 1:01 PM John Nicholson 
> wrote:
>
> > Does anyone know if there is such a thing as a 220V power strip? My
> > searches come up empty handed. I would like to plug the KPA500 into
> > the strip to turn it totally on off. The power switch on the back of
> > the amp is inconvenient to reach in my shack.
> >
> > John K7FD
> >
> >
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Re: [Elecraft] The next generation KAT500

[Eric Garner]

Why is it a "DUH"?

Does it find a better tuning solution than a binary search? If so, how much
better and how much would it matter if it did?

Adding a VNA into a tuner adds component cost, placement cost, board area
cost, engineering cost, additional manufacturing cost to test and find cal
coefficients, etc. If you are building your own tuner, go nuts, but unless
you think you need to do that to differentiate yourself somehow from
competitors I don't see much benefit of doing it commercially.

Eric KI7LTT

On Thu, Jul 1, 2021 at 10:38 AM Dr. William J. Schmidt 
wrote:

> There are tuners that already do this.  The old RF-601 military tuner uses
> phase and magnitude data to resolve the transform between the transmitter
> and the antenna.  While it was before LCD displays, its easily adaptable.
> In fact every tuner I've ever built (save novice days) has used this
> principle.  Its much easier to understand what the tuner is doing if you
> think in transform (Smith-chart) space.  Starting with the transform
> solution means also means you don't need to use the "hunt"/ "branch and
> bound" types of binary searches to find the tuners transform solution.
> It’s a DUH if you think about it.
>
>
> Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
>
> email:  b...@wjschmidt.com
>
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> On Behalf Of Al Lorona
> Sent: Thursday, July 1, 2021 12:09 PM
> To: Elecraft Reflector 
> Subject: [Elecraft] The next generation KAT500
>
> 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 tuner and watch the antenna impedance move toward the center of the
> Smith Chart? The calibration coefficients of the VNA could be set at the
> factory and stored in EEPROM since they wouldn't change much over the life
> of the tuner other than some temperature and aging effects (but even the
> cal vs. temperature could be pre-measured at the factory).
>
> To my knowledge all commercially available tuners simply display the
> measured SWR as a single number; providing a Smith Chart (or rectangular
> graph if you wish) swept over frequency would be a quantum leap in the
> information presented to the user.
>
> Maybe if and when Elecraft decides to design the next generation of the
> KAT500, or maybe this has already been done and I don't know it?
>
> Al  W6LX/4
>
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Re: [Elecraft] 2 meter PA

[Eric Garner]

RM Italy makes amps that would fit the bill. DX Engineering carries them

Eric KI7LTT

On Tue, Jun 1, 2021 at 8:33 AM David Herring  wrote:

> Can anyone recommend a good 2 meter PA for use with a KX3?
>
> I’m not looking to spend a king’s ransom, but I am leery of blindly buying
> an “unknown off-shore branded” unit.
>
> Being paired with a KX3 it would need to be portable (or at least
> luggable) and powered by 12 VDC.  30, 40, 50 watts or so would I think be
> quite fine…just more than the 2 - 3 watts the KX3’s internal 2 meter module
> puts out.
>
> Ideas, suggestions, recommendations welcomed...
>
> 73,
> David - N5DCH
>
>
>
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Re: [Elecraft] rack mount for KPA 1500 and PS

[Eric Garner]

If you want your rack to look like a 16-year-olds Honda Civic, Novexcomm
makes this: http://www.novexcomm.com/product.php?prodid=619
If you prefer a more understated look
https://www.snsengineering.com/product-page/rack-anel-for-kpa1500
You can also buy a vanilla rack shelf from the vendor of your choice and
save $300

-Eric KI7LTT

On Mon, May 3, 2021 at 2:02 PM Howard Sherer  wrote:

> Is there a rack mount kit available for the KPA 1500 and power supply?
>
> Howard Sherer
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Re: [Elecraft] K4 shipping

[Eric Garner]

There was an update to the K4 product page yesterday that spelled this out
in more detail:

*K4 Update 4/25/2021*

We are working hard getting your K4's out the door and we have just
finished shipping our Group 1 orders from May 16th, which was 1 day before
the 2019 Dayton Hamvention opened. We are now shipping from the May 17th
group 1 orders.


We had a huge surge of orders on May 17th from both Dayton, on-line and
telephone orders. We expect it will take us approximately 4-6 weeks to ship
these orders. After that you will start to see the the order date that we
are shipping change much more quickly.


On Mon, Apr 26, 2021 at 1:24 PM stephen shearer 
wrote:

> Bill,
>
> Group one was still taking orders at the beginning of 2020 (January at
> least).
> I placed my group one order before Thanksgiving 2019.
> I suspect (hope) most of the group one orders were placed during the
> Hamvention ??
> I upgraded my order from a K4 to a K4D before Easter 2020 (no problem -
> still in Group One).
> Note the HOLIDAY "gift" theme and the wife got an equal $$ (I asked if
> she wanted a K4D also.  No she {KB3FMT/tech} didn't).
>
> 73, steve WB3LGC
>
> On 4/26/21 3:50 PM, Bill Stravinsky via Elecraft wrote:
> >   Joe
> > There are 3 groups.  Group one has at least 2 days.  Group one day two
> orders should be filled by mid May.  Do you know how many days arein group
> one?  I know I don't, hi.  I don't even know what group I am in.
> > GL with your order.  I am not gonna get too excited about expected
> shipping dates anymore.  I look forward to them telling us that group oneis
> all shipped however long of a period of time that group is.
> >
> > BillK3WJV
> >
> >  On Friday, April 23, 2021, 3:15:40 PM EDT, Joseph Trombino, Jr <
> w...@bellsouth.net> wrote:
> >
> >   Howdy Gang.
> >
> > Getting excited now that my K4 should be shipping in the next several
> weeks.
> >
> > After all, the Mother Ship said that the Group 1 orders will be filled
> by the end of May (this May—grin).
> >
> > And I'm in Group 1 sooo………I’ll believe it when I see it (grin).
> >
> > Any K4’s shipped recently?
> >
> > Take care and stay healthy.
> >
> > CU on the bands, CW of course!
> >
> >  73, Joe W2KJ
> >  I QRP, therefore I am
> > __
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Re: [Elecraft] How often does your KPA1500 lose its mind?

[Eric Garner]

There was a thread about this happening to someone else back in January:
http://mailman.qth.net/pipermail/elecraft/2021-January/282776.html

It was suggested that the state of the REM input might have something to do
with it in some cases:
http://mailman.qth.net/pipermail/elecraft/2021-January/282784.html

hope that helps

Eric KI7LTT



On Mon, Feb 8, 2021 at 10:02 AM Hisashi T Fujinaka 
wrote:

> Just curious, I couldn't remotely power on and talk to my KPA1500 today,
> and I had to power cycle using the switch on the power supply. When it
> came back up, it was all black boxes on the top row of the display.
>
> It needed a firmware (re-)upload and it seems to be fine now, but I'm
> just wondering how common that is.
>
> Thanks.
>
> --
> Hisashi T Fujinaka - ht...@twofifty.com K7EMI
> BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee
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Re: [Elecraft] Can I rent a K4?

[Eric Garner]

isn't that why most expensive things require a deposit to rent them?

Eric KI7LTT

On Wed, Feb 3, 2021 at 9:32 AM Alan - G4GNX  wrote:

> I can't see that working.
>
> When a renter defaults and does a runner, Elecraft would have to layout
> a lot in recovery fees and maybe even end up with a pile of junk for
> their trouble.
>
> It might work in a very small country or if they had a physical presence
> in all states.
>
> 73,
>
> Alan. G4GNX
>
>
> -- Original Message --
> From: "John Harper" 
> To: "Elecraft list" 
> Sent: 03/02/2021 17:20:47
> Subject: [Elecraft] Can I rent a K4?
>
> >I wonder if this model would work?
> >
> >Flex offers a refund for those who try one of their rigs and don't like
> it.
> >But a rental would pose less risk to the manufacturer.
> >
> >There are (rumored) a small number of K4's in existence - the rest, of
> >course, are on hold. But regardless...even after full production has
> begun:
> >
> >What if, before plunking down 4 kilodollars, I could rent the rig for two
> >weeks?
> >
> >If I don't like it, I send it back to Elecraft and I'm only out the rental
> >fee and the cost to ship (renter pays shipping in both directions).
> >
> >If I do like it, I keep the rig and pay the balance.
> >
> >The rental fee would separate the serious potential buyers from those
> >simply wanting a two-week joyride. The question is, how much of a rental
> >fee would be acceptable for a company to offer such a business model?
> >
> >John AE5X
> >https://ae5x.blogspot.com
> >
>
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Re: [Elecraft] Efficiency of MFJ remotely-tuned loop antennas

[Eric Garner]

t;
> >>> You are neglecting the losses in various connections in the system
> >>> ... including possibly the construction of the capacitor itself. I
> >>> don't believe that they are insignificant.  There is a reason why
> >>> top quality variable capacitors often use welded plates.
> >>>
> >>> I would also guess that contact resistance is worse for dissimilar
> >>> materials, such as a copper wire to an aluminum tube.
> >>>
> >>> Yours is a limited theoretical analysis ... not a practical one.
> >>>
> >>> Dave   AB7E
> >>>
> >>>
> >>>
> >>> On 1/18/2021 5:38 PM, Alan Bloom wrote:
> >>>> Well let's see...
> >>>>
> >>>> Radiation resistance of a small loop is 31,171 * (Area /
> >>>> wavelength^2)^2
> >>>>
> >>>> For a loop with a 91cm diameter at 14 MHz, I believe that comes out
> >>>> to 0.064 ohms.
> >>>>
> >>>> Assuming the loss is due to the RF resistance of the loop:
> >>>>
> >>>> From the internet I get the volume resistivity and skin depth for
> >>>> 6063 aluminum is 0.03 microohms-meter and 23.3 micrometers
> >>>> respectively, so the surface resistivity is 0.03/23.3 = 0.0013 ohms
> >>>> per square.  The outside circumference of the tubing is PI * 1.05"
> >>>> = 3.3" and the loop length is PI * 36" = 113" so the loss
> >>>> resistance is .0013 * 113/3.3 = 0.045 ohms.
> >>>>
> >>>> So I calculate an efficiency of 0.064 / (0.064 + 0.045) = 59%
> >>>>
> >>>> So worse than AEA claimed, but in the ballpark.
> >>>>
> >>>> Alan N1AL
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On 1/18/2021 3:39 PM, Wayne Burdick wrote:
> >>>>> Hi Alan,
> >>>>>
> >>>>> 72% sounds a bit high. Is this number based on loop size alone
> >>>>> ("in theory")? Or are they taking conductor geometry and other
> >>>>> losses into account?
> >>>>>
> >>>>> Wayne
> >>>>> N6KR
> >>>>>
> >>>>>
> >>>>>> On Jan 18, 2021, at 2:05 PM, Alan Bloom  wrote:
> >>>>>>
> >>>>>> MFJ makes a pair of small, remotely-tuned loop antennas, the
> >>>>>> MFJ-1786 that covers 10-30 MHz and the MFJ-1788 that covers 7 to
> >>>>>> 21+ MHz.  As far as I can tell, the two antennas are identical
> >>>>>> except for the size of the tuning capacitor.  Each consists of a
> >>>>>> 3 foot (91 cm) diameter loop made of aluminum tubing and a
> >>>>>> plastic housing that contains the tuning capacitor, motor, and
> >>>>>> coupling loop. No control cable is required since the control
> >>>>>> voltage is sent from the control box in the shack to the motor in
> >>>>>> the antenna via the coaxial cable.
> >>>>>>
> >>>>>> Before I purchase one of these I wanted to get an idea of the
> >>>>>> efficiency of such a small loop.  MFJ is silent on the subject so
> >>>>>> I did my own calculations.  The calculations and results are on a
> >>>>>> 1-page document that I uploaded to Dropbox and can be downloaded
> >>>>>> here:
> >>>>>>
> >>>>>> https://www.dropbox.com/s/l8mv67cjrck2ssn/MFJ-1786-1788.pdf?dl=0
> >>>>>>
> >>>>>> My calculations are based on the assumption that the efficiency
> >>>>>> of the MFJ antennas is similar to the (no longer manufactured)
> >>>>>> AEA Isoloop (my reasoning for that is in the document) and that
> >>>>>> AEA's specification of 72% efficiency at 14 MHz is correct.  From
> >>>>>> that number I can calculate the efficiency and gain on all the
> >>>>>> other bands.
> >>>>>>
> >>>>>> If you don't want to download the document, here is a summary of
> >>>>>> the results:
> >>>>>>
> >>>>>> FreqEffGain with respect to a half-wave dipole
> >>>>>> MHzdBdBd
> >>>>>> 7.0-7.3-7.7
&

Re: [Elecraft] OT construction question

[Eric Garner]

In the future, if you dont feel like homebrewing a mount, powerwerx makes 2
and 4 powerpole panel mounts like that. P/N 1462G1 and 146G3

-eric

On Mon, Aug 17, 2020, 4:14 AM Victor Rosenthal 4X6GP 
wrote:

> Here is my Power Pole holder. It is just a piece of 1.6mm thick aluminum
> with a notch in it. The notch is sized precisely to fit the groove in
> the sides of the APP. I just drilled a few holes and filed it to size.
> Then you make a slightly larger rectangular hole in the panel that will
> pass the back part of the APP. All that's left is the mounting holes.
>
> Here's a picture (link is case-sensitive):
> 
>
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> CWops no. 5
> http://www.qsl.net/k2vco/
> .
> On 17/08/2020 12:45, Paul Gedge wrote:
> > Victor,
> >
> > I’ve never considered fabricating such a solution.  Wonderful idea!
> >
> > Thank you!!
> >
> > Love to see any photo of the solution.
> >
> >
> > Best Regards,
> > KF7WCY
> > Paul Gedge
> > Salt Lake City, Utah
> > USA
> >
> >
> > Begin forwarded message:
> >
> > *From:* Victor Rosenthal 4X6GP 
> > *Date:* August 17, 2020 at 1:36:59 AM MDT
> > *To:* Elecraft Reflector 
> > *Subject:* *Re:  [Elecraft] OT construction question*
> >
> > Never mind, I made my own metal dohickey! Just a piece of 1.6mm
> > aluminum with a notch in it. Very cool, if I do say so myself!
> >
> > 73,
> > Victor, 4X6GP
> > Rehovot, Israel
> > Formerly K2VCO
> > CWops no. 5
> > http://www.qsl.net/k2vco/
> >
> > On 17-Aug-2020 09:56, Victor Rosenthal 4X6GP wrote:
> >> What do you think about epoxy-ing an Anderson Power Pole connector
> >> into a 3mm aluminum panel?
> >> Would it be durable?
> >> I know there is a metal dohickey to mount an APP to a panel, but it's
> >> not available here and I don't want to wait weeks.
> >> Or should I just go with a grommet and pigtail?
> > __
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Re: [Elecraft] KX2 3D/X-ray model live demo at QSO Today Ham Expo

[Eric Garner]

Is the presentation going to be recorded for viewing later for those of us
who cant make it this weekend?

Eric

On Fri, Aug 7, 2020, 9:33 AM Wayne Burdick  wrote:

> Curious about how the KX2 and other Elecraft products were designed? One
> of the most important steps in the process is 3D modeling.
>
> On both Saturday and Sunday, I'll be doing live demos of the KX2,
> including a full tour of the radio's 3D model. This will include:
>
>  - building a virtual KX2, one assembly at a time
>  - xray imaging to illustrate efficient space utilization
>  - KXPD2 model (the paddle is directly 3D printed for production)
>  - discussion and live Q&A on design choices, hardware, batteries, etc.
>
> As mentioned in the previous email, we'll be doing live demos of all major
> project lines at the QSO Today Ham Expo this weekend (visit the Expo  <
> https://www.qsotodayhamexpo.com/>Website 
> to register). To sign up for any of the demos, just click on Booth/Demo
> Schedule when you visit our booth.
>
> 73,
> Wayne
> N6KR
>
>
> -
>
> Elecraft...Full-Contact Ham Radio
> www.elecraft.com 
>
> QSO Today Ham Expo gold sponsor; August 8-9, 2020
> www.qsotodayhamexpo.com 
>
>
>
>
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Re: [Elecraft] OT: Astron RS-35M Transformer Hum

[Eric Garner]

Has anyone tried using something like Dynamat (used to damp vibrations in
cars). To keep the case from resonating?

On Fri, Apr 24, 2020 at 9:17 AM Fernando Sindeaux via Elecraft <
elecraft@mailman.qth.net> wrote:

> I have an Astron RS-35A, and also hums, not too loud, but if the Shack is
> in silence, I can hear it, low but can be heard.
> 73 to all,
> Fernando, PY1BL
>
> Sent from my iPhone
>
> > On Apr 24, 2020, at 12:17 PM, Robert Sands  wrote:
> >
> > My Astron hums loudly only when the fax machine runs. Otherwise silent.
> > ?interaction puzzling.
> >
> >> On Fri, Apr 24, 2020, 7:35 AM David Bunte  wrote:
> >>
> >> David -
> >>
> >> I have an RS-35M, that sits on a shelf under my operating desk. I leave
> it
> >> on 24/7, and never gave any thought to acoustic hum from it. I just
> ducked
> >> my head down below the desktop, and 'thought' I could hear some hum. I
> >> turned off the power supply and verified that there is a little bit
> that I
> >> could detect. I am blessed with better than average hearing for a
> >> 76-year-old, but that is largely thanks to my hearing aids.
> >>
> >> In the past I have had pretty bad hum from power supply transformers,
> and
> >> the worst case I ever had was totally cured by tightening the bolts that
> >> held the laminations together. That was pretty easy because it was an
> open
> >> frame transformer in a home brew KW amp. In a number of transformers I
> have
> >> paid attention to in the past few years, the screws or bolts that hold
> the
> >> transformer to the chassis go through the corners of the laminations,
> and
> >> tightening those may also help.
> >>
> >> I have been "told" that acoustic hum is often made more evident because
> the
> >> chassis is vibrating... and that putting some dampening material (a
> sheet
> >> of rubber for example) under the transformer goes a long way toward
> >> reducing the problem.
> >>
> >> Best of luck.
> >>
> >> Dave - K9FN
> >>
> >>
> >>
> >> On Fri, Apr 24, 2020 at 10:14 AM David Herring 
> >> wrote:
> >>
> >>> Does anyone have a way to dampen the physical hum generated by the
> >>> transformer in an RS-35M PS?
> >>>
> >>> This really is just transformer hum I’m hearing, not signal hum…my
> >> station
> >>> is fully bonded and as a result quiet in that regard.  Most folks
> >> probably
> >>> never hear this hum, but I have been “blessed” with really good hearing
> >> and
> >>> so this hum irritates the dickens out of me.
> >>>
> >>> If push comes to shove, I will relocated the PS farther away from the
> >>> operating position, I just didn’t want to have to extend power and
> >> bonding
> >>> runs and thus am hoping someone has a different idea.
> >>>
> >>> Thanks & 73,
> >>> David N5DCH
> >>> (Formerly AH6TD)
> >>>
> >>>
> >>> __
> >>> Elecraft mailing list
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Re: [Elecraft] axt1 tripod

[Eric Garner]

I have an XIT Photo XT57TRS tripod that I use with the AXT1 with the AX1.
With the removable plate it seems to work well :
https://imgur.com/a/dIaXvZl


-eric

On Tue, Mar 31, 2020 at 5:57 PM Walter Underwood 
wrote:

> Tripod screws are 1/4-20, so an angle bracket and a screw and a wingnut
> could help. Tilt the head over 90º.
>
> I did something similar to attach a Nagoya NMO base station mount to a
> tripod.
>
> Photos and description here. I’ve since replaced the hex nut with a
> wingnut.
>
>
> https://observer.wunderwood.org/2018/07/08/using-a-mobile-antenna-as-a-temporary-base-antenna/
>
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
>
> > On Mar 31, 2020, at 5:49 PM, Jay Rutherford  wrote:
> >
> > I raised this issue after getting my AX1 with tripod adaptor, since it
> fit neither of my consumer tripods. You need either a really small tripod
> head or a adjustable ball-type adapter that elevates the AX1 up enough to
> use the BNC plug to the radio.
> >
> > Here is a link to one small ball head adapter from Amazon:
> >
> > AKOAK 1/4" Swivel Mini Ball Head Screw Tripod Mount for DSLR Camera
> Camcorder Light Bracket
> > 4.4 out of 5 stars
> >
> > I hope this helps.
> >
> > 73 Jay K3BH
> >
> >
> > On Tue, Mar 31, 2020, at 18:16, rwwatson wrote:
> >> Hello list,
> >> I now almost have everything I need for my kx3 portable setup. I want
> to use
> >> the ax1 with an axt1 adapter and my tripod has a removable camera plate
> >> which seems to prevent the coax from attaching to the axt1. any
> suggestions
> >> on a good tripod.
> >>
> >>
> >>
> >> --
> >> Sent from: http://elecraft.365791.n2.nabble.com/
> >> __
> >> Elecraft mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> >>
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Re: [Elecraft] Windcamp X3 Li-ion Battery Box usage?

[Eric Garner]

Looking on ebay, there are no less that 9 sellers that have this item. Most
of the closeup shots on all the auctions have a visible URL on the side of
the battery pack for  http://windcamp-gear.com which does not have a
battery box anywhere on the website, so who knows who is actually making or
selling these.

-Eric

On Mon, Sep 23, 2019 at 11:41 AM  wrote:

> I have one and enjoy it. I does make the KX3 with rollover handles,
> heatsink, and cover 1/3 taller and heavy - about 3 lbs. 12 oz. The battery
> box has a second coaxial jack to power accessories.  It has a balancing
> charger connection for use with a RC airplane/car/boat charger. I have an
> AC/DC input charger which is very convenient at home or in the field. It
> comes with a ubiquitous 12.6 volt 110 VAC charger which does the job but
> does not balance the cells.  It is made for flat-top cells. I think button
> cells would be too long. The battery lasts FOREVER.  In fact it might be
> overkill. I'll let you do the math, but for me it is more than enough for a
> typical 48 hour CW contest (including naps). Your mileage will vary
> depending upon the quality of the cells you select.
>
> At first blush it seems expensive. As an accessory for your $1500 radio it
> is a bargain. It is well made and creates a well-integrated package.
>
> GL de ken ke4rg
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> On
> Behalf Of Henry Pollock - K4TMC
> Sent: Monday, September 23, 2019 1:09 PM
> To: Elecraft Reflector 
> Subject: [Elecraft] Windcamp X3 Li-ion Battery Box usage?
>
> I keep seeing these on eBay.  They look neat with packaging that matches,
> and attaches to, the KX3.  Looks like a good way to have an external
> battery
> pack versus keeping batteries inside the KX3.  Wonder if anyone has tried
> one of these?
>
> Windcamp says to only use the 18650 batteries with a flat anode.  The only
> ones that seem to meet that specification are the 3400mah NCR18650B variety
> made for Panasonic.  There are other 18650 batteries available with higher
> capacity (5000+mah), but they have the smaller rounded anode like normal AA
> batteries.  Any thoughts on this?
>
> 73,
>
> Henry - K4TMC
>
> K3+/100, K2/100, KX3
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Re: [Elecraft] KX4 Features ??

[Eric Garner]

One thing it buys you is compatibility with user expectations. The K3s has
a builtin USB sound card, so leaving it out of the K4 would not meet user
expectations of what flagship rig like the K4 should look like. Considering
there's a USB sound card built into most modern rigs now, it would look bad
when comparing them.

I can even hear the whining and moaning now "You are telling me that the
IC-7300, which costs less than a quarter of the price of the K4 has a
built-in sound card and the K4 does not?"

-Eric

On Tue, Aug 20, 2019 at 11:48 AM David Gilbert 
wrote:

>
> What does the built in sound card buy you?  You don't save on cabling
> and USB sound card dongles for the computer are small, cheap, and work
> fine for digital modes.
>
> 73,
> Dave   AB7E
>
>
>
> On 8/20/2019 11:15 AM, Carl Jón Denbow wrote:
> > I would like to see a built-in sound card for digital modes.  As far as
> I know there is no small, portable rig that has this feature.  I do expect
> that a KX4 is either on the drawing boards or at least has been discussed
> by the Elecraft brain trust (aka Eric & Wayne).  73 de Carl
> >
> > Sent from my iPhone
> > ===
> > Carl Jón Denbow, N8VZ
> > 17 Coventry Lane
> > Athens, Ohio 45701-3718
> >
> > c...@n8vz.com
> > www.n8vz.com
> > EM89wh
> >
> > IRLP 4533   Echolink 116070
> >
> > PSK and JT65 Forever!
> > ===
> >
> >> On Aug 20, 2019, at 1:48 PM, Tox  wrote:
> >>
> >> Yep. If you were looking for a sequel to the KX3, the answer appears
> >> to have been:
> >> smaller
> >> lighter
> >> capable of usage in an HT manner
> >> lithium batteries
> >> ...and delivered as the KX2 :)
> >>
> >>> On Tue, Aug 20, 2019 at 10:18 AM Nr4c  wrote:
> >>>
> >>> I think you’re going to have to wait a bit for this one. The KX2 kinda
> slipped in there with a lot of bang fit the buck. And in a real small
> package.
> >>>
> >>> Sent from my iPhone
> >>> ...nr4c. bill
> >>>
> >>>
> >>>> On Aug 20, 2019, at 12:55 PM, Doug Hensley  wrote:
> >>>>
> >>>> With the KX3 now aging from its 2012 debut, has anyone heard what
> might be on the
> >>>> planning board for a KX4 ?   Inquiring minds . . . . .
> >>>>
> >>>> If you are a KX3 user, what would you like to see?
> >>>>
> >>>> Cheers,
> >>>>
> >>>> Doug W5JV
> >>>> K1, K2, K3s
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
> Looking for something special?  Ask us.
> >>>> Wanted: Petersen Type PR-1 in FT-243 holder cut for 1770 kHZ (Used in
> IF Stage of a Mackay Receiver).
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> __
> >>>> Elecraft mailing list
> >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >>>> Help: http://mailman.qth.net/mmfaq.htm
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> >>>>
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> >>> __
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> >>
> >>
> >> --
> >> Scott Small
> >> __
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> >>
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> >&

Re: [Elecraft] Changing KX3 pitch ?

[Eric Garner]

use the knob right above the "pitch" button

-Eric

On Tue, Sep 3, 2019 at 2:47 PM Mike Maloney  wrote:

> I recently inherited a KX3.  I can see what CW pitch setting is (550), BUT
> not been able to change it (to 500) with VFO A or B.  "Set sidetone pitch"
> on page 16 of manual does not say how to CHANGE it?  What's the trick?
> 73, Mike AC5P
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Re: [Elecraft] KX4 Features ??

[Eric Garner]

An upgrade to the kxbc3 to Li-ion or Li-poly would be great, but otherwise
my kx3 is pretty darn awesome.

-eric
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Re: [Elecraft] poor 2m reception on KX3

[Eric Garner]

Following Scott McDonald's off list suggestion I went through with the
cover off and wiggled the coax internal to the KX3 hoping to find an
intermittent connection. I ended up discovering a kink in the coax from the
antenna connector to the 2m board. I'm going to replace that and see if
that was the issue.

-Eric

On Thu, Jul 11, 2019 at 3:16 PM Eric Garner  wrote:

> I just purchased a KX3-2M 2m transverter module for my KX3. After
> installing it I'm finding that I have very poor 2m FM (I have not tried
> SSB) reception. A station just north of me that usually pegs the S-Meter on
> every other radio I own is down in the S3-S4 region and barely copyable.
> Receiving on my TH-D72 concurrently to the KX3 is fine.
>
> I have double checked that my connections to the antenna are sound. I have
> swapped antennas between my HT and my KX3 (both are using a Diamond
> SRH77CA) with no improvement. Since the 2m module uses the 6m band as it's
> IF I've confirmed that 6m FM works as expected.
>
> Does anyone have other troubleshooting steps that might be of use before I
> contact elecraft?
>
> Thanks
> --
> --Eric
> _____
> Eric Garner
>


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[Elecraft] poor 2m reception on KX3

[Eric Garner]

I just purchased a KX3-2M 2m transverter module for my KX3. After
installing it I'm finding that I have very poor 2m FM (I have not tried
SSB) reception. A station just north of me that usually pegs the S-Meter on
every other radio I own is down in the S3-S4 region and barely copyable.
Receiving on my TH-D72 concurrently to the KX3 is fine.

I have double checked that my connections to the antenna are sound. I have
swapped antennas between my HT and my KX3 (both are using a Diamond
SRH77CA) with no improvement. Since the 2m module uses the 6m band as it's
IF I've confirmed that 6m FM works as expected.

Does anyone have other troubleshooting steps that might be of use before I
contact elecraft?

Thanks
-- 
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Re: [Elecraft] new computers, the search for serial ports and the meaning of life...

[Eric Garner]

We use USB/serial adapters from startech

https://www.newegg.com/startech-icusb234858i-usb-to-rs-232-422-485-serial/p/N82E16812399182


at work for our serial port needs. mostly because the ports enumerate in
the same order every time, which is a huge bonus. they have smaller,
cheaper versions as well as a more expensive version that tunnels serial
over ethernet. Having hardware serial ports be the limiting factor when
choosing a PC seems overly limiting to me.

Eric, KI7LTT

On Thu, Jun 20, 2019 at 11:18 AM EricJ  wrote:

> Computers with serial ports running Windows XP/7 are approaching boat
> anchor status along with Drake receivers and EF Johnson transmitters.
>
> Eric KE6US
>
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