Re: [Elecraft] RG-8X

[donovanf]

DX Engineering 400MAX is an excellent choice, I'm sure you'll 
be pleased with its performance. Make the extra effort to seal the 
connectors very, very well and be sure you install the cable on 
your tower securely so that high winds cannot possibly cause 
abrasion of the coaxial cable jacket. 


Good luck! 


73 
Frank 
W3LPL 

- Original Message -

From: "Richard"  
To: "Elecraft Reflector"  
Sent: Tuesday, February 27, 2018 2:02:32 AM 
Subject: Re: [Elecraft] RG-8X 

The problem is often I get an answer or a request for more info, and I reply 
without realizing that it goes to an individual’s e-mail address, not to the 
selector at large. It almost happened with this one. 

I was talking about 75 to 100 feet on 50 MHz. 

I plan to use DXE’s 400MAX, with which I have had excellent results before. 

Richard - W4KBX 

> On Feb 26, 2018, at 8:23 PM, donov...@starpower.net wrote: 
> 
> W4KBX hasn't commented about the frequency at which he intends 
> to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter 
> what type or manufacturer -- isn't the best choice for 100 foot cable 
> lengths at 21 MHz or above. 
> 
> 
> 
> It s a much better investment to step up to the next larger diameter 
> coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof 
> flooded coax) are much better choices for 100 foot cable lengths 
> at 21 MHz or above. 
> 
> 
> Of course its hard to beat LDF4-50A but at a cable length of only 
> 100 feet the difference in loss compared to LMR400 is less than 
> 1/2 dB at 50 MHz. You'll never notice the difference. 
> 
> 
> LDF4-50A or LMR600 is an excellent choice for a 200 foot coax 
> length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A 
> or LMR900 is a better choice. 
> 
> 
> All of this assumes proper installation. Moisture intrusion resulting 
> from poor installation practices will degrade your investment no 
> matter what coax you select. 
> 
> 
> 73 
> Frank 
> W3LPL 
> 
> - Original Message - 
> 
> From: j...@kk9a.com 
> To: elecraft@mailman.qth.net 
> Sent: Monday, February 26, 2018 10:28:05 PM 
> Subject: [Elecraft] RG-8X 
> 
> The original post by W4KBX was this: "I’m seeking recommendations for 
> RG-8X coax with the lowest loss. The total run will be about 100 feet." 
> 
> You cannot defy physics and have low loss with 1/4" coax, no matter who 
> the manufacture is, but RG8X was his criteria. 
> 
> John KK9A 
> 
> 
> Jim Brown K9YC wrote: 
> 
> On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: 
>> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. 
> My thinking, I would cringe at putting up a nice yagi such as this and 
> not use the feedline with the lowest loss possible. Most likely Andrew 
> LDF4-50A hardline. 
> 
> Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in 
> hardline, transitioning to a short length of flexible coax for the 
> rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is 
> about 1 dB on 6M. 
> 
> 73, Jim K9YC 
> 
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Re: [Elecraft] RG-8X

[Richard]

The problem is often I get an answer or a request for more info, and I reply 
without realizing that it goes to an individual’s e-mail address, not to the 
selector at large. It almost happened with this one.

I was talking about 75 to 100 feet on 50 MHz.

I plan to use DXE’s 400MAX, with which I have had excellent results before.

Richard - W4KBX

> On Feb 26, 2018, at 8:23 PM, donov...@starpower.net wrote:
> 
> W4KBX hasn't commented about the frequency at which he intends 
> to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter 
> what type or manufacturer -- isn't the best choice for 100 foot cable 
> lengths at 21 MHz or above. 
> 
> 
> 
> It s a much better investment to step up to the next larger diameter 
> coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof 
> flooded coax) are much better choices for 100 foot cable lengths 
> at 21 MHz or above. 
> 
> 
> Of course its hard to beat LDF4-50A but at a cable length of only 
> 100 feet the difference in loss compared to LMR400 is less than 
> 1/2 dB at 50 MHz. You'll never notice the difference. 
> 
> 
> LDF4-50A or LMR600 is an excellent choice for a 200 foot coax 
> length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A 
> or LMR900 is a better choice. 
> 
> 
> All of this assumes proper installation. Moisture intrusion resulting 
> from poor installation practices will degrade your investment no 
> matter what coax you select. 
> 
> 
> 73 
> Frank 
> W3LPL 
> 
> - Original Message -
> 
> From: j...@kk9a.com 
> To: elecraft@mailman.qth.net 
> Sent: Monday, February 26, 2018 10:28:05 PM 
> Subject: [Elecraft] RG-8X 
> 
> The original post by W4KBX was this: "I’m seeking recommendations for 
> RG-8X coax with the lowest loss. The total run will be about 100 feet." 
> 
> You cannot defy physics and have low loss with 1/4" coax, no matter who 
> the manufacture is, but RG8X was his criteria. 
> 
> John KK9A 
> 
> 
> Jim Brown K9YC wrote: 
> 
> On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: 
>> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. 
> My thinking, I would cringe at putting up a nice yagi such as this and 
> not use the feedline with the lowest loss possible. Most likely Andrew 
> LDF4-50A hardline. 
> 
> Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in 
> hardline, transitioning to a short length of flexible coax for the 
> rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is 
> about 1 dB on 6M. 
> 
> 73, Jim K9YC 
> 
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Re: [Elecraft] KPA1500

[Eric Swartz - WA6HHQ, Elecraft]

Hi Bill,

We ship the RF deck and Power Supply in two individual inner boxes that are 
then packed with special foam corner inserts into a larger outside shipping 
box. The foam inserts, air gap and the outer box provide the extra protection 
needed for shipping via UPS etc. We lose that protection if we ship it using 
just the two inner boxes on their own.

The easiest thing I would suggest is to simply open the top of the outer box 
upon receipt and then easily remove the lighter two inner boxes separately to 
move it. They lift out very easily.

Regards,

Eric
elecraft.com
_..._



> On Feb 24, 2018, at 1:45 PM, Bill Johnson  wrote:
> 
> Wayne, I noted the entire amp and supply came in one box.  For the sake of 
> lifting could the amp and supply be boxed separately?  I am very seriously 
> consider buying one.  I do have the KPA500 now and it is such a pleasure to 
> use.
> 
> 72 & 73,
> Bill
> K9YEQ, FT’er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc. 
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net  On 
> Behalf Of Wayne Burdick
> Sent: Saturday, February 24, 2018 2:58 PM
> To: Elecraft ; elecraft...@yahoogroups.com
> Subject: [Elecraft] KPA1500
> 
> If you’ve just received a KPA1500 and have a question outside Elecraft’s 
> normal business hours, please post the question here. Eric and I, as well as 
> rest of the engineering team, monitor the list regularly. 
> 
> Those considering a KPA1500 might want to check out some of the reviews 
> posted so far (including one from today):
> 
> https://www.eham.net/reviews/detail/13702
> 
> 73,
> Wayne
> N6KR
> 
> 
> 
> http://www.elecraft.com
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Re: [Elecraft] RG-8X

[donovanf]

W4KBX hasn't commented about the frequency at which he intends 
to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter 
what type or manufacturer -- isn't the best choice for 100 foot cable 
lengths at 21 MHz or above. 



It s a much better investment to step up to the next larger diameter 
coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof 
flooded coax) are much better choices for 100 foot cable lengths 
at 21 MHz or above. 


Of course its hard to beat LDF4-50A but at a cable length of only 
100 feet the difference in loss compared to LMR400 is less than 
1/2 dB at 50 MHz. You'll never notice the difference. 


LDF4-50A or LMR600 is an excellent choice for a 200 foot coax 
length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A 
or LMR900 is a better choice. 


All of this assumes proper installation. Moisture intrusion resulting 
from poor installation practices will degrade your investment no 
matter what coax you select. 


73 
Frank 
W3LPL 

- Original Message -

From: j...@kk9a.com 
To: elecraft@mailman.qth.net 
Sent: Monday, February 26, 2018 10:28:05 PM 
Subject: [Elecraft] RG-8X 

The original post by W4KBX was this: "I’m seeking recommendations for 
RG-8X coax with the lowest loss. The total run will be about 100 feet." 

You cannot defy physics and have low loss with 1/4" coax, no matter who 
the manufacture is, but RG8X was his criteria. 

John KK9A 


Jim Brown K9YC wrote: 

On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote: 
> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W. 
My thinking, I would cringe at putting up a nice yagi such as this and 
not use the feedline with the lowest loss possible. Most likely Andrew 
LDF4-50A hardline. 

Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in 
hardline, transitioning to a short length of flexible coax for the 
rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is 
about 1 dB on 6M. 

73, Jim K9YC 

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Re: [Elecraft] KX3 Tuner Operation at Low Voltages

[Wayne Burdick]

Hi Dean,

The latching relays in the tuner should work just fine at low supply voltages; 
they run off a voltage regulator, so their coils should see 5 V even when the 
rig is running from as low as 8 V.

I think what you’re seeing is not enough forward power to qualify the SWR 
readings. If the load impedance you’re working into is low (on a given band), 
the instantaneous key-down TX current drain will go up and the forward power 
might drop below the minimum required level for accurate readings. The ATU will 
skip LC combinations that don’t meet the measurement criteria.

The effect could be made worse by batteries that have higher ESR, which varies 
with state of charge, number of charge cycles, and temperature. Any increase in 
ESR reduces key-down max power output.

To see if the bridge is working correctly, connect the rig to a dummy load, run 
it from 10 V, turn the ATU off, and check the key-down SWR reading (TUNE) at 
0.5 W, 1.0 W, and 2.0 W. Let me know what you find.

73,
Wayne
N6KR




> On Feb 26, 2018, at 4:36 PM, AL7CR  wrote:
> 
> My KX3 internal tuner works perfectly at transmit voltages above 10v.  Below 
> that value it will initiate tuning but finish at an SWR of between 3 and 6.  
> When this happens if I connect my station 13.6v supply or an external 12v 
> battery supply it will immediately tune to the expected low SWR.
> 
> Elecraft tech support was a bit non committal on this issue.  They said that 
> 10v was close to the minimum value for the relay drivers to operate properly. 
>  This is a bit strange as one does not have to operate long with internal 
> NiMh batteries before the transmit voltage drops below 10v.
> 
> An easy work around is to perform my portable tuning when I first start 
> operating.  Still this seems strange behavior for a rig designed to work on 
> the internal battery pack.
> 
> Is this normal operation for the internal tuner?  If not, then what should I 
> check?  I thought that tuning at a lower power might help but the manual 
> states the tuner operates at either 2w or 3w and the value is not under user 
> control.


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[Elecraft] KX3 Tuner Operation at Low Voltages

[AL7CR]

My KX3 internal tuner works perfectly at transmit voltages above 10v.  Below 
that value it will initiate tuning but finish at an SWR of between 3 and 6.  
When this happens if I connect my station 13.6v supply or an external 12v 
battery supply it will immediately tune to the expected low SWR.

Elecraft tech support was a bit non committal on this issue.  They said that 
10v was close to the minimum value for the relay drivers to operate properly.  
This is a bit strange as one does not have to operate long with internal NiMh 
batteries before the transmit voltage drops below 10v.

An easy work around is to perform my portable tuning when I first start 
operating.  Still this seems strange behavior for a rig designed to work on the 
internal battery pack.

Is this normal operation for the internal tuner?  If not, then what should I 
check?  I thought that tuning at a lower power might help but the manual states 
the tuner operates at either 2w or 3w and the value is not under user control.
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Re: [Elecraft] KPA1500 Remote

[Rick Tavan]

No, KPA1500 Remote is not yet available. I'm using the Operate page of
KPA1500 Utility instead, via a remote desktop, with very good results but I
look forward to KPA1500 Remote when it comes out.

73,

/Rick N6XI


Rick Tavan
Truckee, CA

On Mon, Feb 26, 2018 at 9:22 AM, Paul Baldock  wrote:

> Is there a "KPA1500 Remote" program yet?
>
> - Paul  KW7Y
>
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Re: [Elecraft] Old Coax, was RG-8X

[GWK]

Those look like military surplus connectors - they were quite common in 
the 50's and probably before.  A bear to use, but solid.


George W3HBM

On 2/26/2018 6:24 PM, John Oppenheimer wrote:

The discussion about old coax reminded me of a recent acquisition. A
couple of weeks ago I went through my old childhood home in FL, just
before it was sold, to look for "stuff" from the past. The property had
a shed, which predated our home, which had old radio stuff in it when I
was young. Looked high and low for something "radio." Finally, up in the
rafters of the shed was a coil for coax with UHF connectors. It predates me.

https://www.icloud.com/sharedalbum/#B0iGhtLJ3GJNmWk

When were those connectors used? Yes, I cleaned off the crud that came
off with a damp cloth.

John KN5L
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[Elecraft] WSJT-X Mystery File

[Richard]

I found this little text file in WSJT-X’s log directory.



In case the file itself doesn’t go through, here’s the text, I hope:

Name Time   Frac dTime   dFracCalls
--
 decoder  1875.820  1.00   0.4960.00   1942
decft8   1875.324  1.00   9.4840.01   1942
sync8   116.719  0.06   116.7190.06   5816
ft8b1749.121  0.93   917.9260.49   752423
ft8_down   38.098  0.02 38.0980.02   752423
bpd174103.652  0.06   103.6520.06   405643
osd174 689.445  0.37   689.4450.37   352125
--
  1875.820  1.00

Can anyone interpret it for me? I’m thinking it may contain some information 
relevant to my transmit start/stop delays.

Cheers!

Richard Kunc — W4KBX

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[Elecraft] Old Coax, was RG-8X

[John Oppenheimer]

The discussion about old coax reminded me of a recent acquisition. A
couple of weeks ago I went through my old childhood home in FL, just
before it was sold, to look for "stuff" from the past. The property had
a shed, which predated our home, which had old radio stuff in it when I
was young. Looked high and low for something "radio." Finally, up in the
rafters of the shed was a coil for coax with UHF connectors. It predates me.

https://www.icloud.com/sharedalbum/#B0iGhtLJ3GJNmWk

When were those connectors used? Yes, I cleaned off the crud that came
off with a damp cloth.

John KN5L
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Re: [Elecraft] RG-8X

[Bob McGraw K4TAX]

I found that not all RG-8X is created equal.  For one project, I 
measured 3 or 4 different brands of new RG-8X to find that the loss can 
vary considerably.  The measurement method was to use 50 ft, snake it 
back an forth across the floor so as not to have adjacent coupling, the 
ends fitted with N type connectors and connected to my Spectrum Analyzer 
with tracking generator. Normal meaningful sweep was 0.1 MHz to 1 
GHz.    I don't recall the numbers but I was a bit surprised to find 
significant difference as I recall.  The project was in preparation of 
antennas for Field Day operation.


73

Bob, K4TAX


On 2/26/2018 4:28 PM, j...@kk9a.com wrote:

The original post by W4KBX  was this:  "I’m seeking recommendations for
RG-8X coax with the lowest loss. The total run will be about 100 feet."

You cannot defy physics and have low loss with 1/4" coax, no matter who
the manufacture is, but RG8X was his criteria.

John KK9A


Jim Brown K9YC wrote:

On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote:

I did inquire as to the application.  To feed a 6M yagi being a 6OWL6W.

My thinking, I would cringe at putting up a nice yagi such as this and
not use the feedline with the lowest loss possible.  Most likely Andrew
LDF4-50A hardline.

Me too!  The 350 ft run from my shack to the 3-el SteppIR is 7/8-in
hardline, transitioning to a short length of flexible coax for the
rotator loop. Scrounged the hard line used for roughly $1/ft.  Loss is
about 1 dB on 6M.

73, Jim K9YC

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[Elecraft] RG-8X

[j...@kk9a.com]

The original post by W4KBX  was this:  "I’m seeking recommendations for
RG-8X coax with the lowest loss. The total run will be about 100 feet."

You cannot defy physics and have low loss with 1/4" coax, no matter who
the manufacture is, but RG8X was his criteria.

John KK9A


Jim Brown K9YC wrote:

On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote:
> I did inquire as to the application.  To feed a 6M yagi being a 6OWL6W. 
My thinking, I would cringe at putting up a nice yagi such as this and
not use the feedline with the lowest loss possible.  Most likely Andrew
LDF4-50A hardline.

Me too!  The 350 ft run from my shack to the 3-el SteppIR is 7/8-in
hardline, transitioning to a short length of flexible coax for the
rotator loop. Scrounged the hard line used for roughly $1/ft.  Loss is
about 1 dB on 6M.

73, Jim K9YC

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Re: [Elecraft] KX3 and CW SKIMMER

[Bob N3MNT]

I use skimmer with a KX3 and PX3 and it works well.  You will need a good
sound card and a reasonably fast computer. If you plan to use other software
to control the KX3 or intelligent logging, you will need one of several
available port replicator apps. 



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Re: [Elecraft] RG-8X

[Jim Brown]

On 2/26/2018 10:45 AM, Tom Georgens wrote:

HI Jim

Thanks for your informed commentary

One question I have had is, if loss is dominated by resistive losses at HF,
does coax actually get more lossy with age?  If so, what is the mechanism.
Does the dielectric change properties, or do the copper surfaces corrode or
break down?   If the dielectric breaks down, then the impedance should
change as well

Most  info on cable life deal primarily with the UV, heat, and moisture
resistance of the jacket but I have seen very little about aging of the
internal components.


Hi Tom. I don't know enough about this issue to say anything useful, 
except for this.  When N6RZ died something like 8 years ago, I bought a 
lot of his stuff and helped his XYL, Kerry, get rid of the rest of it. 
He had a lot of coax and some hard line; I bought the hard line, and 
took the random lengths of coax to an NCCC meeting, telling members 
where it had come from. Almost all of it was good quality stuff, some 
used inside, some outside. I even found some stored in a shed. I'd guess 
most of it was at least 20 years old. Everyone turned their noses up at 
it, so I brought it home, made stubs out of it, and measured their 
effectiveness. I didn't have a VNA then, so I used an HP generator and 
HP spectrum analyzer (as an RF voltmeter), doing point by point 
measurements. Most of the stub data in that Q are for that cable.


Since a harmonic stub depends on a low value of impedance to work, that 
tells me the cables were still quite good. The only bad piece of cable I 
found was one whose interior jacket was green from oxidation of the 
shield. I think it had come from that shed.


Until I learn more about it, I go under the assumption that the primary 
hazard is moisture.  Because dielectric loss doesn't kick in until at 
least UHF, I don't buy that being as a factor at HF. A few years ago, I 
noticed moisture around the Polyphaser for one of my high dipoles when I 
removed it for some reason. I had only recently replaced the dipole and 
the coax run (Belden 8213), but hadn't done a good enough job of sealing 
the coax around the center insulator. Water penetrated, came down 
between the braid and dielectric, and in less than a year, had turned 
the shield black. I put that length of coax on the VNA and found that 
loss had increased from about 0.4 dB to about 0.45 dB.


I'm copying this to the reflector, hoping that guys like W3LPL will jump 
in with more.


73, Jim


Thanks

Tom W2SC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, February 26, 2018 10:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] RG-8X

On 2/26/2018 9:28 AM, j...@kk9a.com wrote:

I believe all RG8X has a .242 diameter PVC jacket and about the same loss.
Certainly some brands are better made, I use only Belden 9258.

Not quite. First, for at least 40 years, RG-numbers are NOT a specification,
but only a generic description of cable, mostly telling us the approximate
outer diameter and the characteristic impedance (Zo).
Below about 500 MHz, loss in coax is all due to I squared R, which depends
entirely on the combined resistance of the center conductor and the shield
at the frequency of interest.

Zo depends on conductor diameters, spacing, and the dielectric material.
Coax with a foam dielectric allow the center conductor to be larger for the
same shield diameter. THAT'S why foam cables have lower loss, NOT because of
lower loss in the dielectric -- dielectric loss doesn't show up until we're
well into the UHF region. Shield resistance is reduced by a larger diameter
for two reasons -- more copper and skin effect. Many coax cables don't use
copper for center or shield or both. Loss will be greater at low frequencies
if the center is copper-coated steel, which is often done for both cost and
physical strength. Loss will also be greater if the shield uses less copper
or is made from aluminum.

As usual, Frank has asked the right questions -- there are important
"applications-related" differences between coax types, even from the same
manufacturer.

In general, it's best to use bigger coax from a trusted manufacturer, and
with the best quality shield. Larger coax has less loss. Don't buy smaller
coax because you're running low power -- our Field Day team runs QRP, and
all of our coax is RG8-size with a foam dielectric for low loss and a robust
copper braid shield!

There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf

73, Jim K9YC

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[Elecraft] KX3 and CW SKIMMER

[NOEL POULIN]

Hello,
Anybody in this group using the KX3  with CW SKIMMER software???
I would like to know how it's working.
Thanks
Noel
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Re: [Elecraft] RG-8X

[Jim Brown]

On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote:

I did inquire as to the application.  To feed a 6M yagi being a 6OWL6W.  My 
thinking, I would cringe at putting up a nice yagi such as this and not use the 
feedline with the lowest loss possible.  Most likely Andrew LDF4-50A hardline.


Me too!  The 350 ft run from my shack to the 3-el SteppIR is 7/8-in 
hardline, transitioning to a short length of flexible coax for the 
rotator loop. Scrounged the hard line used for roughly $1/ft.  Loss is 
about 1 dB on 6M.


73, Jim K9YC


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Re: [Elecraft] RG-8X

[Bob McGraw K4TAX]

I did inquire as to the application.  To feed a 6M yagi being a 6OWL6W.  My 
thinking, I would cringe at putting up a nice yagi such as this and not use the 
feedline with the lowest loss possible.  Most likely Andrew LDF4-50A hardline. 

Bob, K4TAX


Sent from my iPhone

> On Feb 26, 2018, at 12:21 PM, Dave Cole (NK7Z)  wrote:
> 
> Thanks for sharing!  Very interesting.
> 
> 73s and thanks,
> Dave
> NK7Z
> https://www.nk7z.net
> 
>> On 02/26/2018 10:10 AM, Jim Brown wrote:
>> 
>> There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf
>> 73, Jim K9YC
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> 


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Re: [Elecraft] RG-8X

[Dave Cole (NK7Z)]

Thanks for sharing!  Very interesting.

73s and thanks,
Dave
NK7Z
https://www.nk7z.net

On 02/26/2018 10:10 AM, Jim Brown wrote:


There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf

73, Jim K9YC

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Re: [Elecraft] RG-8X

[Jim Brown]

On 2/26/2018 9:28 AM, j...@kk9a.com wrote:

I believe all RG8X has a .242 diameter PVC jacket and about the same loss.
Certainly some brands are better made, I use only Belden 9258.


Not quite. First, for at least 40 years, RG-numbers are NOT a 
specification, but only a generic description of cable, mostly telling 
us the approximate outer diameter and the characteristic impedance (Zo). 
Below about 500 MHz, loss in coax is all due to I squared R, which 
depends entirely on the combined resistance of the center conductor and 
the shield at the frequency of interest.


Zo depends on conductor diameters, spacing, and the dielectric material. 
Coax with a foam dielectric allow the center conductor to be larger for 
the same shield diameter. THAT'S why foam cables have lower loss, NOT 
because of lower loss in the dielectric -- dielectric loss doesn't show 
up until we're well into the UHF region. Shield resistance is reduced by 
a larger diameter for two reasons -- more copper and skin effect. Many 
coax cables don't use copper for center or shield or both. Loss will be 
greater at low frequencies if the center is copper-coated steel, which 
is often done for both cost and physical strength. Loss will also be 
greater if the shield uses less copper or is made from aluminum.


As usual, Frank has asked the right questions -- there are important 
"applications-related" differences between coax types, even from the 
same manufacturer.


In general, it's best to use bigger coax from a trusted manufacturer, 
and with the best quality shield. Larger coax has less loss. Don't buy 
smaller coax because you're running low power -- our Field Day team runs 
QRP, and all of our coax is RG8-size with a foam dielectric for low loss 
and a robust copper braid shield!


There's a tutorial on this topic at http://k9yc.com/Coax-Stubs.pdf

73, Jim K9YC

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[Elecraft] RG-8X

[j...@kk9a.com]

I believe all RG8X has a .242 diameter PVC jacket and about the same loss.
Certainly some brands are better made, I use only Belden 9258.

Perhaps the question should be what is the best coax with a diameter less
than ??? or weight less then ???, for ??? MHz, good for ??? watts for a
portable/permanent installation? There might be some interesting options.


John KK9A

Mon Feb 26 12:07:16 EST 2018

Hi Richard,


Please provide a little more information so that your question can
be answered more accurately.


At what frequencies will you be using your coax?


Will your coax be buried or laid on the ground, or will it not be
in contact with the ground at all?



Many coaxial cables have a vinyl jacket which is very susceptible
to moisture penetration if buried or laid on moist ground.


Are rodents (squirrels, mice, etc) a problem in your area?


Vinyl jacketed coax is very susceptible to rodent damage which
will quickly increase your coax loss.


73
Frank
W3LPL


From: Richard 
To: Elecraft Reflector 
Sent: Monday, February 26, 2018 8:35 AM
Subject: [Elecraft] RG-8X

I’m seeking recommendations for RG-8X coax with the lowest loss. The total
run will be about 100 feet.

Cheers!

Richard Kunc — W4KBX

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[Elecraft] KPA1500 Remote

[Paul Baldock]

Is there a "KPA1500 Remote" program yet?

- Paul  KW7Y

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Re: [Elecraft] RG-8X

[donovanf]

Hi Richard, 


Please provide a little more information so that your question can 
be answered more accurately. 


At what frequencies will you be using your coax? 


Will your coax be buried or laid on the ground, or will it not be 
in contact with the ground at all? 



Many coaxial cables have a vinyl jacket which is very susceptible 
to moisture penetration if buried or laid on moist ground. 


Are rodents (squirrels, mice, etc) a problem in your area? 


Vinyl jacketed coax is very susceptible to rodent damage which 
will quickly increase your coax loss. 


73 
Frank 
W3LPL 


From: Richard  
To: Elecraft Reflector  
Sent: Monday, February 26, 2018 8:35 AM 
Subject: [Elecraft] RG-8X 

I’m seeking recommendations for RG-8X coax with the lowest loss. The total run 
will be about 100 feet. 

Cheers! 

Richard Kunc — W4KBX 

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Re: [Elecraft] RG-8X

[Bob McGraw K4TAX]

In using ARRL Transmission Line for Windows application:

RG-8X  Belden 100 ft @ 50 MHz has 2.5 dB loss

LMR-240 Times Microwave  100 ft @ 50 MHz has 1.7 dB loss

RG -213 Belden 8267 has 1.5 dB loss at 50 MHz

RG-8 Belden 9913 has 0.88 dB loss for 100 ft at 50 MHz.  {Due to the 
nature of this line having a lot of air content, the reason for low 
loss,  it is reported to have moisture condensation issues.   Thus I 
would avoid it for outside use.}


Andrew LDF4-50A which is 1/2" hard line has 0.44 dB loss at 50 MHz

These were just a few I checked.  All values calculated for 100 ft, with 
a 1:1 SWR at 50 MHz.


I would cringe at the thought of putting up a fine antenna and loose any 
performance on transmit and receive due to feed line loss.   In my case 
I have a 4 element HyGain 6M yagi which is fed with about 75 ft of 
Andrew LDF4-50.  I selected the 4 element on a 12 ft boom as opposed to 
the 5 element on a 12 ft boom.   The side lobe pattern on the 4 element 
yagi is much cleaner, hence noise off axis is lessened.


I didn't see any polar response plots on their site so I can't comment 
on overall performance of the 6OWL6.


73

Bob, K4TAX

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[Elecraft] No RX/TX below 3MHz

[Dreamglider]

Good day.
My kx3 is deaf below 3MHz. 
Below 3mhz it's deaf, no power out and indicated swr is 25.4:1
3 and above MHz is fine and dandy, i used it last night on 80m, plenty of
power, atu matched and rx was just as normal.
I Tried to remove and re seat the atu, but the problem is the same, i also
updated the firmware/dsp to the latest official release.
KX3 is fitted with the atu, charger/rtc and the filter.

Regin
OY1R



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Re: [Elecraft] Pan adapter and CW skimmer

[Pinewood Data]

I do this with an RSP1. I have a YouTube video showing this: 
https://youtu.be/KusmkeLdfwE.  I use the K3 RX ant out to BNC tee, second port 
to the SDR and the third to the K3 RX ant in. I do it that way for several 
reasons. CW skimmer works fine too. 

> On Feb 26, 2018, at 6:37 AM, Brian P  wrote:
> 
> Not sure if you already checked this out but for the CW Skimmer issue check
> out the doc posted on their website for the KX3. Its under the resources
> section of the cw skimmer page http://www.dxatlas.com/cwskimmer/ . I would
> post the direct link but it references a .docx document and I dont want to
> raise any red flags on the list.
> 
> On Mon, Feb 26, 2018 at 3:53 AM, Matteo Gosi via Elecraft <
> elecraft@mailman.qth.net> wrote:
> 
>> Hello,
>> I am new with Elecraft products and as I have just bought a K3S I have a
>> couple of questions.
>> Has anyone tried to use an RTL dongle (via the IF out) as a panadapter
>> instead of a P3?I have tried to connect mine to the IF out but it doesn't
>> seem to work. I used HDSDR I have enetred the IF frequency in the settings
>> but I don't get any signal.
>> 
>> Also as I am using CW Skimmer, I have noticed that it doesn't "work" that
>> well as it used to do with my old Yeasu.I have tried different
>> configuration but I think I am missing something
>> Matteo,M0TKM
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> 
> 
> 
> -- 
> Regards,
> 
> Brian Powell
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Re: [Elecraft] RG-8X

[Bob Gibson via Elecraft]

Richard..If you are set on using the small size the real LMR-240 is the best 
bet..also may want to check with MFJ.. they now carry a very good line of 
coax!! 
    73s Bob W5RG


  From: Richard 
 To: Elecraft Reflector  
 Sent: Monday, February 26, 2018 8:35 AM
 Subject: [Elecraft] RG-8X
   
I’m seeking recommendations for RG-8X coax with the lowest loss. The total run 
will be about 100 feet.

Cheers!

Richard Kunc — W4KBX

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[Elecraft] RG-8X

[Richard]

I’m seeking recommendations for RG-8X coax with the lowest loss. The total run 
will be about 100 feet.

Cheers!

Richard Kunc — W4KBX

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Re: [Elecraft] KPA500/KAT500 Remote Software

[Chris Hallinan]

Heh, I thought this post died a silent death ;)

Thanks for the reply, Rick.  But each of your answers has that "Windows"
word in it.
I don't currently own a Windows machine, and I don't want to.  Yes, I have
had to run a Windows VM for certain tasks because that's the only option
(K3 Utility, etc.) And I will say that VMWare for MAC has come a long way,
and you can get almost hardware speeds running Windows VMs on a MAC.  But I
don't have any desire to run the Windows OS.  And worse, there are known
issues running hardware devices like multiple USB serial ports using a
Virtual Machine.  I want to use my MACs natively.

MacLoggerDX is excellent for anyone who hasn't looked lately.  And the
support is awesome.

Heck, I'd port the utilities to OS X myself if I could get access to the
source code.  I'd put it up on github for all to contribute.  I'm a big fan
of open source.

73 de K1AY
Chris

On Sun, Feb 25, 2018 at 11:42 PM, Rick Tavan  wrote:

> KAT500 Remote and KPA500 Remote are excellent control programs. There are
> three ways to access them remotely:
>
>1. Run them on a Windows machine at the radio site and access them via
>a remote desktop app such as Chrome Remote Desktop which runs natively on
>either Windows or Mac. The Windows machine at the radio site can be very
>inexpensive and, since it isn't used for general computing, can be very
>reliable. I do this sometimes and it works fine. My Windows server is an
>Intel NUC that's sized about 4"x4"x2". You can find cheaper, though.
>2. Run them as server apps on a Windows machine at the radio site and
>access them from a Windows machine running the same apps as clients. I do
>this most of the time and it works great. I do it from both a "real"
>Windows machine and from a virtual Windows machine running under VMware
>Fusion on a MacBook Pro. But beware that, although Fusion on the Mac can be
>made to work, it's a complex environment. I needed three professionals to
>help me get it working, including two on the Fusion team at VMware! (It was
>my son, who doesn't work at VMware, who finally figured out a fatal
>trackpad driver problem.)
>3. Run them on a local Windows machine or virtual Windows OS at the
>control site with remote serial ports at the radio site. This is the
>minimal hardware solution but it does require Fusion with the same caveat
>as above.
>
> Remote control is a lot of fun if you can enjoy or at least tolerate the
> system integration!
>
> 73,
>
> /Rick N6XI
>
>
> Rick Tavan
> Truckee, CA
>
> On Fri, Feb 23, 2018 at 9:58 AM, Chris Hallinan 
> wrote:
>
>> Any solutions for MAC out there?
>>
>> http://www.elecraft.com/k2_remote.htm#k3remote
>>
>> I use MacLoggerDX for logging and basic rig parameter feedback for the log
>> and I love it.  But I need a good remote solution on the KAT500, KPA500
>> and
>> yeah, my K3.
>>
>> 73 de K1AY
>> Chris
>>
>> --
>> Life is like Linux - it never stands still.
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Re: [Elecraft] Pan adapter and CW skimmer

[Bob McGraw K4TAX]

Most likely the RTL dongle won't or doesn't tune down to the IF 
frequency of 8 Mhz +/-.


I use a SDR Play connected to the IF and use HDSDR with OmniRig to 
control the SDR play and to control the K3S.  Works great.


73
Bob, K4TAX




On 2/26/2018 2:53 AM, Matteo Gosi via Elecraft wrote:

Hello,
I am new with Elecraft products and as I have just bought a K3S I have a couple 
of questions.
Has anyone tried to use an RTL dongle (via the IF out) as a panadapter instead 
of a P3?I have tried to connect mine to the IF out but it doesn't seem to work. 
I used HDSDR I have enetred the IF frequency in the settings but I don't get 
any signal.

Also as I am using CW Skimmer, I have noticed that it doesn't "work" that well 
as it used to do with my old Yeasu.I have tried different configuration but I think I am 
missing something
Matteo,M0TKM
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Re: [Elecraft] Pan adapter and CW skimmer

[Brian P]

Not sure if you already checked this out but for the CW Skimmer issue check
out the doc posted on their website for the KX3. Its under the resources
section of the cw skimmer page http://www.dxatlas.com/cwskimmer/ . I would
post the direct link but it references a .docx document and I dont want to
raise any red flags on the list.

On Mon, Feb 26, 2018 at 3:53 AM, Matteo Gosi via Elecraft <
elecraft@mailman.qth.net> wrote:

> Hello,
> I am new with Elecraft products and as I have just bought a K3S I have a
> couple of questions.
> Has anyone tried to use an RTL dongle (via the IF out) as a panadapter
> instead of a P3?I have tried to connect mine to the IF out but it doesn't
> seem to work. I used HDSDR I have enetred the IF frequency in the settings
> but I don't get any signal.
>
> Also as I am using CW Skimmer, I have noticed that it doesn't "work" that
> well as it used to do with my old Yeasu.I have tried different
> configuration but I think I am missing something
> Matteo,M0TKM
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-- 
Regards,

Brian Powell
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[Elecraft] KPA1500

[j...@kk9a.com]

I have moved many Alpha amps without removing the transformer. I believe
you only have to remove it for shipping. They also have screws to secure
the fan that should be installed.  I just sold an OM Power 2000+ and
shipped it with the transformer. That was a heavy box to carry to FedEx! 
I have no issue with Elecraft shipping the lightweight power supply and
amp together however for those that cannot lift it perhaps the Elecraft
shipping depart can accommodate them with two shipments for an extra
charge.

John KK9A

Rick Tavan N6XI wrote:

I believe Alpha warns not even to try to move the amp with its transformer
installed. It is connectorized so you can remove the transformer in a few
minutes and then transport it and the chassis separately. Otherwise, you
risk bending the chassis under the weight of the transformer, assuming you
can move it at all! KPA1500 is a true breakthrough in weight for a
full-power amp!

/Rick N6XI

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[Elecraft] Pan adapter and CW skimmer

[Matteo Gosi via Elecraft]

Hello,
I am new with Elecraft products and as I have just bought a K3S I have a couple 
of questions.
Has anyone tried to use an RTL dongle (via the IF out) as a panadapter instead 
of a P3?I have tried to connect mine to the IF out but it doesn't seem to work. 
I used HDSDR I have enetred the IF frequency in the settings but I don't get 
any signal.

Also as I am using CW Skimmer, I have noticed that it doesn't "work" that well 
as it used to do with my old Yeasu.I have tried different configuration but I 
think I am missing something
Matteo,M0TKM
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Re: [Elecraft] KPA1500

[Petr, OK1RP/M0SIS]

Hi all,

Margaret taking the first KPA1500 to the Shipping
Department...http://www.elecraft.com/news.htm

...so if Margaret is lifting and handling both boxes together even with so
nice smiling then "man" should not worry about the moving it too... hihi.

73 - Petr, OK1RP 



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http://ok1rp.blogspot.com
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Re: [Elecraft] KX2 echo in the speaker

[Irma & Linas(LY2H)]

Touching is like you take the radio in to your hands, put it upside down on
the table, removing the back pannel, or just like pushing buttons on the
radio, or like taking  a pen and slightly bumping on the chassis. I have
tried to turn the mic's gain down to 0, but it didn't help.
Linas LY2H

On 2018 vas. 26, pr at 02:09 John Hiatt  wrote:

>
> How hard are you touching it?  I am wondering if it could be the internal
> microphone picking it up.
>
>
> John, KC7DRI
>
> --
> *From:* elecraft-boun...@mailman.qth.net 
> on behalf of Irma & Linas(LY2H) 
> *Sent:* Sunday, February 25, 2018 1:03 PM
> *To:* elecraft@mailman.qth.net
> *Subject:* [Elecraft] KX2 echo in the speaker
>
> Hello group,
>
> I have a bizzair effect in my KX2. When I touch the chassis of the radio
>  each  touch corresponds with the echo in the speaker. The radio is not
> connected to the antenna, could run on the battery or the PS, the effect is
> there. Touching also makes the Smeter bar move a bit.
> Does anybody has/had the same issue and know the solution?
>
> Thanks , Linas LY2H
>
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