[Elecraft] WTB Elecraft W2, 2kw sensor

[Raymond Benny]

Looking for a second Elecraft 2kw Directional Coupler sensor for the W2
wattmeter.

Anyone have a spare or not really using theirs?

73,

Ray,
N6VR
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Re: [Elecraft] Running WSPR on KX3 using a Mac

[Jim Brown]

On Mon,1/23/2017 9:13 PM, Walter Underwood wrote:

It looks like WSPR might be built into WSJT-X now.


Yes, it's in v1.7, which I think might be in late beta. Yes, there's a 
Mac version. Download here.


http://physics.princeton.edu/pulsar/k1jt/wsjtx.html

v1.7 is a major upgrade -- more modes, more functionality, and improved 
decode performance in modes like JT65.


73, Jim K9YC

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Re: [Elecraft] Running WSPR on KX3 using a Mac

[Walter Underwood]

It looks like WSPR might be built into WSJT-X now. This post from 1.5 years ago 
talks about that.

http://wsprnet.org/drupal/node/5563 

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 23, 2017, at 8:37 PM, Brian ve3bwp Pietrzyk  wrote:
> 
> There seems to be a lot of Mac users on this forum. No answers on WSPR forums 
> so hopefully someone here has overcome this:
> 
> Is there anyone here running WSPR on a Mac?
> 
> My qrp digital station is a KX3, a Signalink USB, a MacBook (and a CrankIR).
> 
> Been able to do all the modes I want (using fldigi and WSJT and FreeDV) so 
> far except WSPR. I downloaded and followed the WSPR install (and CLI 
> instructions) and stuck at getting flrig errors. Emails to the author are 
> bouncing back.
> 
> Anyone else been down this road?
> 
> Brian ve3bwp
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Re: [Elecraft] WTB - KX2

[Chris Tate - N6WM]

Power contester.. superstation owner/operator..  and yes,  also a KX2 owner..  
this thing is one of the coolest radios I have ever owned.  LOVE IT!  Can take 
it anywhere!

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dave AD6A
Sent: Monday, January 23, 2017 8:36 PM
To: pkhjr ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] WTB - KX2

Look no furtherElecraft sell them! They're excellent - love mine! I'd bet 
no one will be selling their KX2 secondhand anytime soon

Cheers es 73,
Dave AD6A

Sent from my  iPhone 5s

> On Jan 23, 2017, at 12:59 PM, pkhjr via Elecraft  
> wrote:
> 
> Looking for KX2, contact me off line.
> 
> 73 Tex
> ka5y
> 
> 
> 
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/WTB-KX2-tp7626042.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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> d...@ad6a.com

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[Elecraft] Running WSPR on KX3 using a Mac

[Brian ve3bwp Pietrzyk]

There seems to be a lot of Mac users on this forum. No answers on WSPR forums 
so hopefully someone here has overcome this:

Is there anyone here running WSPR on a Mac?

My qrp digital station is a KX3, a Signalink USB, a MacBook (and a CrankIR).

Been able to do all the modes I want (using fldigi and WSJT and FreeDV) so far 
except WSPR. I downloaded and followed the WSPR install (and CLI instructions) 
and stuck at getting flrig errors. Emails to the author are bouncing back.

Anyone else been down this road?

Brian ve3bwp
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Re: [Elecraft] WTB - KX2

[Dave AD6A]

Look no furtherElecraft sell them! They're excellent - love mine! I'd bet 
no one will be selling their KX2 secondhand anytime soon

Cheers es 73,
Dave AD6A

Sent from my  iPhone 5s

> On Jan 23, 2017, at 12:59 PM, pkhjr via Elecraft  
> wrote:
> 
> Looking for KX2, contact me off line.
> 
> 73 Tex
> ka5y
> 
> 
> 
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/WTB-KX2-tp7626042.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

[Jean-François Ménard]

Hi,

I already used the Alexloop inside my house a few years ago. I was using at 
that time a FT-897D running at 5W on battery on 20m…. And I did many contacts 
using PSK31 and JT-65. I was really fun to see how it was possible to even do 
contacts inside the house…. At least, to experiment mode without going outside 
during the winter season. Hi Hii ‼️

73 de Jeff | VA2SS

__
Jeff | VA2SS
Jean-François Ménard

jean-francois.men...@va2ss.com
www.VA2SS.com

Membre de / Member of :
ARRL / AMSAT / QRP ARCI / FISTS / SKCC / MICHIGAN QRP CLUB

Message envoyé à partir de mon appareil mobile.
Message sent from my portable device.

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Re: [Elecraft] Audio Output Impedance of the KX3

[Mel Farrer via Elecraft]

OK, here goes my two cents on my KX3 operation.  I use the internal speaker for 
CW only.  I use a miniX self powered speaker for quiet portable work and I use 
a FM modulator from the phone jack while in the mobile to the car FM receiver.  
 All seems to work fine.  This way I don't worry about impedance issues.

Mel, K6KBE


  From: Don Wilhelm 
 To: w7aqk ; Elecraft Reflector  
 Sent: Monday, January 23, 2017 1:35 PM
 Subject: Re: [Elecraft] Audio Output Impedance of the KX3
   
David,

Let me try to respond and perhaps Jim will chime in a well.

Modern audio amplifier output stages are very low output impedance devices.
As such, they can produce as much power as the device connected will 
allow.  In a practical design of course there is a limit to how much 
current the attached device (speaker or headphones) can draw from the 
amplifier.

With that being said, the lower the impedance, the more current that 
will be drawn.  Speakers are generally in the 4 ohm to 8 ohm region and 
a 4 ohm speaker will draw more current and develop more power than an 8 
ohm speaker.  The efficiency of a speaker makes a big difference in the 
amount of sound it produces.

Headphones are a slightly different matter (but only slightly) in that 
they are typically higher impedance and the current will be lower, and 
the voltage across it can be higher, but they are more efficient than 
speakers so it usually does not matter.  The efficiency of headphones is 
usually expressed in SPL - the higher the number, the greater the 
sensitivity.  Impedance does not matter much except in some low 
efficiency Hi-Fi audiophile headphones.

In an analogy, consider the AC power line - that is a very low impedance 
source of a fixed voltage.  How much power is taken from the line 
depends on the impedance of the device plugged into it.  Within limits, 
an audio amplifier shares some of the same characteristics even though 
its voltage and power are much more limited.

73,
Don W3FPR

On 1/23/2017 3:06 PM, w7aqk wrote:
> Jim,
>
> Maybe you could expand on that somewhat as I'm still confused a bit.
> Perhaps I'm not understanding what I hear, or why, but it almost always
> seems that when speakers (or headphones) are not closely matched to the
> designed impedance I notice some deterioration in output.  Some mismatch
> doesn't seem too serious, but when the difference is high, it seems much
> more noticeable.
>
> On the other hand, I've also experienced that using headphones with
> higher sensitivity ratings (like most Sony ear buds) tends to provide
> much higher output.  Most ear buds tend to be 32 ohm (16 at lest), but I
> find Sony ear buds usually work best as many of them have sensitivity
> ratings up around -108 dbm.  I could very well be fooling myself!
>
> This topic was covered somewhat similarly back when folks, including me,
> were complaining about poor audio output from Heil headphones.  The
> headphone portion of my Yamaha CM500 works a lot better than my Heil,
> but neither works as well as some ear buds.  I don't really have another
> good pair of headphones around here to try.
>
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Re: [Elecraft] MAG LOOP ANTENNAS

[Lynn W. Taylor, WB6UUT]

On 1/23/2017 1:52 PM, Peter LaBissoniere wrote:

The jury is still out, in my opinion, as to how RF affects the human body, 
especially the brain.


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Re: [Elecraft] MAG LOOP ANTENNAS

[Peter LaBissoniere]

Yeah I often smell baked ham when using my KPA500.

Sent from my iPhone

> On Jan 23, 2017, at 3:21 PM, KENT TRIMBLE  wrote:
> 
> The Alex Loop is rated at 20 watts PEP maximum.
> 
> Even at 5 watts, I position mine as far away from my body as I can.
> 
> The jury is still out, in my opinion, as to how RF affects the human body, 
> especially the brain.
> 
> 73,
> 
> Kent Trimble, K9ZTV
> Jefferson City, MO
> 
> 
> 
>> On 1/23/2017 1:11 PM, someone wrote:
>> The tuning problem is mitigated by the fact that I usually sit directly 
>> under it when it's mounted on the tripod and I can just reach up and adjust 
>> it.
>> 
> 
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Re: [Elecraft] Audio Output Impedance of the KX3

[Don Wilhelm]

David,

Let me try to respond and perhaps Jim will chime in a well.

Modern audio amplifier output stages are very low output impedance devices.
As such, they can produce as much power as the device connected will 
allow.  In a practical design of course there is a limit to how much 
current the attached device (speaker or headphones) can draw from the 
amplifier.


With that being said, the lower the impedance, the more current that 
will be drawn.  Speakers are generally in the 4 ohm to 8 ohm region and 
a 4 ohm speaker will draw more current and develop more power than an 8 
ohm speaker.  The efficiency of a speaker makes a big difference in the 
amount of sound it produces.


Headphones are a slightly different matter (but only slightly) in that 
they are typically higher impedance and the current will be lower, and 
the voltage across it can be higher, but they are more efficient than 
speakers so it usually does not matter.  The efficiency of headphones is 
usually expressed in SPL - the higher the number, the greater the 
sensitivity.  Impedance does not matter much except in some low 
efficiency Hi-Fi audiophile headphones.


In an analogy, consider the AC power line - that is a very low impedance 
source of a fixed voltage.  How much power is taken from the line 
depends on the impedance of the device plugged into it.  Within limits, 
an audio amplifier shares some of the same characteristics even though 
its voltage and power are much more limited.


73,
Don W3FPR

On 1/23/2017 3:06 PM, w7aqk wrote:

Jim,

Maybe you could expand on that somewhat as I'm still confused a bit.
Perhaps I'm not understanding what I hear, or why, but it almost always
seems that when speakers (or headphones) are not closely matched to the
designed impedance I notice some deterioration in output.  Some mismatch
doesn't seem too serious, but when the difference is high, it seems much
more noticeable.

On the other hand, I've also experienced that using headphones with
higher sensitivity ratings (like most Sony ear buds) tends to provide
much higher output.  Most ear buds tend to be 32 ohm (16 at lest), but I
find Sony ear buds usually work best as many of them have sensitivity
ratings up around -108 dbm.  I could very well be fooling myself!

This topic was covered somewhat similarly back when folks, including me,
were complaining about poor audio output from Heil headphones.  The
headphone portion of my Yamaha CM500 works a lot better than my Heil,
but neither works as well as some ear buds.  I don't really have another
good pair of headphones around here to try.


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Re: [Elecraft] Audio Output Impedance of the KX3

[Jim Brown]

On Mon,1/23/2017 12:54 PM, Jim Brown wrote:
The impedance of mics is defined as 5X their minimum load impedance. 


Correction -- one-fifth of their minimum load impedance. For example, a 
250 ohm mic should drive an input impedance no lower than 1.25K. Most 
pro mics are in the range of 150-250 ohms.


Another point I forgot to mention. ALL electro-acoustic transducers 
(mics, loudspeakers, headphones) are very complex, and their equivalent 
circuits are also very complex, containing multiple reactive components 
and a few resonances. The impedance curve of a typical loudspeaker or 
headphone has a low frequency peak of hundreds of ohms, a broad minimum 
at the lower middle of its operating range, and rises rapidly with 
frequency as it approaches the top of its operating range. The impedance 
of a loudspeaker or headphones is defined as that minimum value of the 
impedance. Multi-way loudspeakers have two such drivers, each with its 
own equivalent circuit, fed respectively by low pass and high pass filters.


73, Jim K9YC

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[Elecraft] MAG LOOP ANTENNAS

[KENT TRIMBLE]

The Alex Loop is rated at 20 watts PEP maximum.

Even at 5 watts, I position mine as far away from my body as I can.

The jury is still out, in my opinion, as to how RF affects the human 
body, especially the brain.


73,

Kent Trimble, K9ZTV
Jefferson City, MO



On 1/23/2017 1:11 PM, someone wrote:
The tuning problem is mitigated by the fact that I usually sit 
directly under it when it's mounted on the tripod and I can just reach 
up and adjust it.




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[Elecraft] (OT FINI ) MAG LOOP ANTENNAS

[Robert 'RC' Conley]

Thanks everyone for thoughts and help on the MAG LOOPS. I thinks for now
operating issues indoors can be solved with a BL2 and a large roll of
20-24ga white wire.
73 KC5WA

-- 
May You Live Long and Prosper
what's life without a few dragons
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[Elecraft] WTB - KX2

[pkhjr via Elecraft]

Looking for KX2, contact me off line.

73 Tex
ka5y



--
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http://elecraft.365791.n2.nabble.com/WTB-KX2-tp7626042.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Audio Output Impedance of the KX3

[Jim Brown]

Hi Dave,

I've written about this many times, but here goes again. :)  Your choice 
of the words "designed impedance" is a good one.


Audio output stages have an internal impedance MUCH lower than the loads 
they are designed to drive. For example, a typical speaker output stage 
is designed to drive any load impedance greater than 4 ohms, but it's 
own internal impedance (also called "source impedance") is a small 
fraction of an ohm. The ratio between those two impedances is called the 
"damping factor," and a value of 100 is typical. Line level outputs for 
consumer gear are typically in the range of 200-400 ohms, and are 
designed to drive 47K. Pro line outs are typically 100 ohms, designed to 
drive 5-10K. The impedance of mics is defined as 5X their minimum load 
impedance.


Output stages that feed plug-able jacks are usually built with resistors 
in series to protect the output devices from damage by a short when a 
jack is being inserted or is inserted improperly. Typical resistor 
values are in the range of 10-500 ohms. Headphone outputs are designed 
to feed headphone impedances between 8 and 500 ohms.


The impedance of headphones is simply a ratio between voltage and 
current. Lower impedance headphones need less voltage but more current, 
higher impedance headphones need more voltage but less current. That 
series protection resistor tends to compensate for those differences. 
Engineers who design headphones understand all of this and they want 
their headphones to work with anything they are plugged into, so they 
tend to design for high voltage sensitivity.


It's a pretty safe assumption that any "brand name" headphones are going 
to work with any well-designed headphone amp.  The KX3 is a bit of a 
special case, because Wayne always designs for low battery drain, which 
means that his audio output stages are somewhat "current starved," so 
they don't provide a lot of output. As usual, I find his designs to be 
very good compromises in that regard.


I find the KX3 plenty loud enough with any of the decent headphones I've 
tried, and pretty good in a quiet location with the internal speaker.  I 
virtually always operate with cans, and use the speaker only for casual 
monitoring. I find the KX3 quite useful for chasing RFI or checking out 
temporary antennas.


73, Jim K9YC

On Mon,1/23/2017 12:06 PM, w7aqk wrote:
Maybe you could expand on that somewhat as I'm still confused a bit. 
Perhaps I'm not understanding what I hear, or why, but it almost 
always seems that when speakers (or headphones) are not closely 
matched to the designed impedance I notice some deterioration in 
output.  Some mismatch doesn't seem too serious, but when the 
difference is high, it seems much more noticeable.



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Re: [Elecraft] Audio Output Impedance of the KX3

[w7aqk]

Jim,

Maybe you could expand on that somewhat as I'm still confused a bit. 
Perhaps I'm not understanding what I hear, or why, but it almost always 
seems that when speakers (or headphones) are not closely matched to the 
designed impedance I notice some deterioration in output.  Some mismatch 
doesn't seem too serious, but when the difference is high, it seems much 
more noticeable.


On the other hand, I've also experienced that using headphones with higher 
sensitivity ratings (like most Sony ear buds) tends to provide much higher 
output.  Most ear buds tend to be 32 ohm (16 at lest), but I find Sony ear 
buds usually work best as many of them have sensitivity ratings up 
around -108 dbm.  I could very well be fooling myself!


This topic was covered somewhat similarly back when folks, including me, 
were complaining about poor audio output from Heil headphones.  The 
headphone portion of my Yamaha CM500 works a lot better than my Heil, but 
neither works as well as some ear buds.  I don't really have another good 
pair of headphones around here to try.


Also, it was interesting to see Eric's response to this question.  He 
indicates that the rigs are spec'd at 4 ohms, and that 8 ohm speakers would 
diminish output somewhat.


Anyway, maybe you could make this all a bit clearer.

Thanks,

Dave W7AQK


From: Jim Brown 

On Mon,1/23/2017 9:22 AM, Walter Underwood wrote:

For portable operation, I use Apple EarPods. Those are 45 Ohms.


Don't worry about impedance of headphones. There is no need to match
impedances in audio circuits.

73, Jim K9YC 


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Re: [Elecraft] Audio Output Impedance of the KX3

[ANCLETUS ERNEST]

I use from day one headset insten with mic works very will

>From my DL750 Digicel

On Jan 23, 2017 2:35 PM, a...@sbcglobal.net wrote:
A good question?   See you got specific answer for K3/K3S but not KX3.   Any 
direct answers for KX3, rather than different headsets?   I would go for 
earbuds for lightest weight but would like high efficiency type with KX3.
Anyone found a good efficient set of earbuds with the KX3?
73, Mike  AC5P

On Monday, January 23, 2017 11:01 AM, Joe W2KJ  wrote:


 Howdy Gang:

Checked the KX3 manual but was unable to find the audio output impedance of the 
KX3, i.e., what impedance headphones/speaker should I be using on the rig?

I’m looking to buy a lightweight headset for portable ops and want to know what 
impedance I should be looking for.

Many thanks for any info.

73, Joe W2KJ
KX3,  KX2



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Re: [Elecraft] Audio Output Impedance of the KX3

[ac5p]

A good question?   See you got specific answer for K3/K3S but not KX3.   Any 
direct answers for KX3, rather than different headsets?   I would go for 
earbuds for lightest weight but would like high efficiency type with KX3.    
Anyone found a good efficient set of earbuds with the KX3?   
73, Mike  AC5P 

On Monday, January 23, 2017 11:01 AM, Joe W2KJ  wrote:
 

 Howdy Gang:

Checked the KX3 manual but was unable to find the audio output impedance of the 
KX3, i.e., what impedance headphones/speaker should I be using on the rig?

I’m looking to buy a lightweight headset for portable ops and want to know what 
impedance I should be looking for.

Many thanks for any info.

            73, Joe W2KJ
            KX3,  KX2



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Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

[Fred Jensen]

Many years ago, when computers filled buildings, consumed a megawatt or 
two, and the IBM CEO forecast a world-wide market for them of maybe six, 
ten tops ... automatic antenna matching, particularly in HF mobile 
environments, was sometimes achieved by sampling the voltage and current 
at the feed point and driving a motor on the matching unit's capacitor 
shaft to make the phase difference zero [i.e. resonance].  Should be 
able to do that with a mag loop today in a much smaller package.


I do wish Alex had put a 10:1 drive on the capacitor shaft however.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/23/2017 11:16 AM, kevino z wrote:

I just wish Alex would release the motor to control the tuning...
-Kevin (KK4YEL)


-
The problem with the world is that the intelligent people are full of 
doubts, while the stupid ones are full of confidence.


On Jan 23, 2017, at 14:13, Fred Jensen > wrote:


Good to know.  I've never tried my Alexloop inside the house, but for 
an all-round portable antenna it meets the requirements of size, ease 
of set-up/take-down, and working well at QRP-ish power levels.  The 
tuning problem is mitigated by the fact that I usually sit directly 
under it when it's mounted on the tripod and I can just reach up and 
adjust it.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


On 1/23/2017 5:21 AM, Doug Turnbull wrote:

Fred,
Well put and useful.I can though testify that the AlexLoop 
can work
amazingly well from inside a frame house and even a stone house as I 
have

tried this.


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Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

[kevino z]

I just wish Alex would release the motor to control the tuning...
-Kevin (KK4YEL)


-
The problem with the world is that the intelligent people are full of doubts, 
while the stupid ones are full of confidence.

On Jan 23, 2017, at 14:13, Fred Jensen 
> wrote:

Good to know.  I've never tried my Alexloop inside the house, but for an 
all-round portable antenna it meets the requirements of size, ease of 
set-up/take-down, and working well at QRP-ish power levels.  The tuning problem 
is mitigated by the fact that I usually sit directly under it when it's mounted 
on the tripod and I can just reach up and adjust it.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


On 1/23/2017 5:21 AM, Doug Turnbull wrote:
Fred,
Well put and useful.I can though testify that the AlexLoop can work
amazingly well from inside a frame house and even a stone house as I have
tried this.

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Re: [Elecraft] Audio Output Impedance of the KX3

[Fred Jensen]

I think it is very low on practically all of today's radios and it 
doesn't matter, the output stage will drive anything.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/23/2017 9:00 AM, Joe W2KJ wrote:

Howdy Gang:

Checked the KX3 manual but was unable to find the audio output impedance of the 
KX3, i.e., what impedance headphones/speaker should I be using on the rig?

I’m looking to buy a lightweight headset for portable ops and want to know what 
impedance I should be looking for.

Many thanks for any info.

73, Joe W2KJ
KX3,   KX2



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--
This message has been scanned by E.F.A. Project and is believed to be clean.




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Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

[Fred Jensen]

Good to know.  I've never tried my Alexloop inside the house, but for an 
all-round portable antenna it meets the requirements of size, ease of 
set-up/take-down, and working well at QRP-ish power levels.  The tuning 
problem is mitigated by the fact that I usually sit directly under it 
when it's mounted on the tripod and I can just reach up and adjust it.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


On 1/23/2017 5:21 AM, Doug Turnbull wrote:

Fred,
 Well put and useful.I can though testify that the AlexLoop can work
amazingly well from inside a frame house and even a stone house as I have
tried this.


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Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

[Ron D'Eau Claire]

It doesn't directly address KC5WA's need (unless his retirement home is at
the beach) but a subterfuge I see used on the coast for people at vacation
rentals involve long surf-fishing poles. Some are 20 feet or more long so it
is common to see them propped up near vertical at the deck railing at
people's apartments when they are not in use. They are a very common sight
with nothing "Ham Antenna" about them, but a wire instead of fishing line
running up the length of the pole can be a very effective outdoor radiator. 

And if it's a fine wire that was cast from the pole into a nearby tree
extending its length for a full half wave on 40 or 80 meters, all the
better!   

The old phrase, "Necessity is the Mother of invention" comes to mind. After
all, trolling the Ham bands is just a different sort of "fishing". 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic
Rosenthal
Sent: Sunday, January 22, 2017 10:07 PM
To: Ron D'Eau Claire
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] (OT redoux) MAG LOOP ANTENNAS

I agree with Ron that the best solution is wire outdoors. I too lived in
apartments and did similar things. Best results always seemed to come from
some sort of balanced antenna when possible. Nowadays there are so many
noise sources in buildings that getting a wire outside is worth the
struggle. Indoors, you are within the loop of the AC lines, Ethernet cables,
etc. Try to get out of the loop and use a balun to decouple the outside of
the feed line if it's coax.
Small wire like no. 20 enameled wire can be almost invisible from a few feet
away.
Another possibility is a temporary antenna. You can make a little stand for
a mag loop and place it outdoors to operate and then bring it inside when
you are done.
I have a little game I play whenever I visit a new place. I ask myself "how
would I put up an antenna if I lived here?" My wife is used to my walking
around looking at trees, etc.

Vic 4X6GP

> On 23 Jan 2017, at 02:49, Ron D'Eau Claire  wrote:
> 
> Over the years I've done a fair bit of operating from inside 
> apartments. My tactic was to get as much wire up as high as possible 
> while still being unobtrusive. I was running 10 watts or less, CW.
> 
> In one location I had a tree about 20 feet away from a window at my 
> operating desk. I slipped a fine wire out of the window (so I could 
> still close it) and hooked it to some fishing line leader which I then 
> tossed into the tree, succeeding in getting it about 20 feet above the 
> ground. It was not visible and survived some surprising winds. Worked 
> it against a counterpoise made from fine white wire held along the 
> (apartment white) wall with pushpins.
> 
> Where I had a 2nd (top) floor unit, I had good success with a thin 
> white wire 'doublet' tacked onto the wall near the ceiling with the 
> two halves running as nearly in opposite directions as possible I was 
> able to get about
> 50 feet of wire up that way and made a lot of contacts including some 
> DX. Of course being indoors brings you closer to all sources of noise 
> and, depending upon the construction of the building a certain amount 
> of "shielding".
> 
> One apartment building had a flat roof. The manager okayed me 
> installing a simple antenna on the roof. It never hurts to ask. In 
> another top floor location I discovered I had an attic access door in 
> one closet, so I installed a "doublet" in the attic just under the 
> roof rafters. Got a full half wave on 40 in that space with a bend in 
> each half. The "feeder" was open wire - thin white wires that passed 
> through two tiny holes in the ceiling next to the wall at my operating 
> position and down to the rig. It worked beautifully on 40 through 10 
> meters. On that one when I moved I never got into the attic space to 
> remove the antenna, insulators, etc. I just cut the feeder at the 
> ceiling and filled the tiny holes. Eventually someone needing to do 
> work in the attic probably scratched their head wondering what that was -
unless they were a Ham.
> 
> 73, Ron AC7AC
> 
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
> Robert 'RC' Conley
> Sent: Sunday, January 22, 2017 6:16 AM
> To: Elecraft@mailman.qth.net
> Subject: [Elecraft] (OT redoux) MAG LOOP ANTENNAS
> 
> Guys;
> I'm anticipating a move to a seniors villa and I know I will be unable 
> to to take my antenna farm and most of the ham shack. I've decided on 
> my KX2 with ATU (grab-n go). A MAG LOOP should allow indoor operations 
> at QRP power levels.Thanks for your thoughts.
> 73
> KC5WA
> 
> --
> May You Live Long and Prosper
> what's life without a few dragons
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Re: [Elecraft] Audio Output Impedance of the KX3

[Eric Swartz - WA6HHQ, Elecraft]

For the speaker output, the K3 and K3S are optimized for 4 ohms. The SP3 is a 4 
ohm speaker.


8 Ohm speakers work fine, but a a slightly lower audio output for the same 
volume control position.


Eric
/elecraft.com/

On 1/23/2017 9:00 AM, Joe W2KJ wrote:

Howdy Gang:

Checked the KX3 manual but was unable to find the audio output impedance of the 
KX3, i.e., what impedance headphones/speaker should I be using on the rig?

I’m looking to buy a lightweight headset for portable ops and want to know what 
impedance I should be looking for.

Many thanks for any info.

73, Joe W2KJ
KX3,   KX2



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Re: [Elecraft] KAT-500 Remote software display

[Lynn W. Taylor, WB6UUT]

On 1/23/2017 10:20 AM, Don Wilhelm wrote:
Those values are used by the firmware to compute the SWR.  I do not 
know the conversion factors (and don't really care since the firmware 
does the computation). 
If you're calculating SWR, you don't need to convert them before you do 
the calculation -- as long as the units are the same.

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Re: [Elecraft] KAT-500 Remote software display

[Don Wilhelm]

Jack,

VFWD and VRFL are values straight out of the analog to digital 
conversion of forward power and reflected power measured by the coupler. 
 The value can range from 0 to 4096.  See the KAT500 Command Reference.


Those values are used by the firmware to compute the SWR.  I do not know 
the conversion factors (and don't really care since the firmware does 
the computation).


The VFWD will be relative to the measured power output and the 
difference between VFWD and VRFL will be relative to the SWR - in other 
words, a low VRFL is goodness representing low reflected power.


73,
Don W3FPR

On 1/23/2017 11:15 AM, w4grj wrote:

Recently noticed on the KAT500 remote interface on the PC, lower right corner
shows VFWD and VRFL, when I run winlink express with radio at 100 watts USB it 
shows
VFWD:675  VRFL:50
Appreciate if someone can explain the numbers

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Re: [Elecraft] K3/KX3 and Bluetooth Headphones

[Bob N3MNT]

I purchased a Bluetooth transmitter for use with sound system and decided to
try it on my KX3.  Works OK for SSB, but absolutely unusable for CW as
mentioned the latency is so bad I had to disconnect it to send.



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View this message in context: 
http://elecraft.365791.n2.nabble.com/K3-KX3-and-Bluetooth-Headphones-tp7589751p7626030.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Audio Output Impedance of the KX3

[Jim Brown]

On Mon,1/23/2017 9:22 AM, Walter Underwood wrote:

For portable operation, I use Apple EarPods. Those are 45 Ohms.


Don't worry about impedance of headphones. There is no need to match 
impedances in audio circuits.


73, Jim K9YC

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Re: [Elecraft] Audio Output Impedance of the KX3

[Walter Underwood]

For portable operation, I use Apple EarPods. Those are 45 Ohms.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 23, 2017, at 9:07 AM, Walter Underwood  wrote:
> 
> I use Yamaha CM500 headphones and their specs say 120 Ohms. They work fine.
> 
> http://usa.yamaha.com/products/music-production/accessories/headphones/cm500/ 
> 
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ (my blog)
> 
>> On Jan 23, 2017, at 9:00 AM, Joe W2KJ  wrote:
>> 
>> Howdy Gang:
>> 
>> Checked the KX3 manual but was unable to find the audio output impedance of 
>> the KX3, i.e., what impedance headphones/speaker should I be using on the 
>> rig?
>> 
>> I’m looking to buy a lightweight headset for portable ops and want to know 
>> what impedance I should be looking for.
>> 
>> Many thanks for any info.
>> 
>>  73, Joe W2KJ
>>  KX3,   KX2
> 
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Re: [Elecraft] Audio Output Impedance of the KX3

[Walter Underwood]

I use Yamaha CM500 headphones and their specs say 120 Ohms. They work fine.

http://usa.yamaha.com/products/music-production/accessories/headphones/cm500/ 


wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 23, 2017, at 9:00 AM, Joe W2KJ  wrote:
> 
> Howdy Gang:
> 
> Checked the KX3 manual but was unable to find the audio output impedance of 
> the KX3, i.e., what impedance headphones/speaker should I be using on the rig?
> 
> I’m looking to buy a lightweight headset for portable ops and want to know 
> what impedance I should be looking for.
> 
> Many thanks for any info.
> 
>   73, Joe W2KJ
>   KX3,   KX2

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[Elecraft] Audio Output Impedance of the KX3

[Joe W2KJ]

Howdy Gang:

Checked the KX3 manual but was unable to find the audio output impedance of the 
KX3, i.e., what impedance headphones/speaker should I be using on the rig?

I’m looking to buy a lightweight headset for portable ops and want to know what 
impedance I should be looking for.

Many thanks for any info.

73, Joe W2KJ
KX3,   KX2



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[Elecraft] OT : The passage of time brings change 

[Ken G Kopp]

Thanks for setting me straight, Don.

I -do- have a number of bags of 75 ohm
connectors ... both BNC and Type N ...
that do have smaller pins, but they are "old" ... like me.  We used them by
the hundreds on our microwave and MUX.

73

K0PP
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[Elecraft] Let me build you K2 or other Elecraft kit.

[Alan Price]

I have built hundreds of K2's over the years.  let me build one for you.  My 
prices are reasonable and you have a new K2 with the options you want.


73

Alan

W1HYV
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[Elecraft] KAT-500 Remote software display

[w4grj]

Recently noticed on the KAT500 remote interface on the PC, lower right corner
shows VFWD and VRFL, when I run winlink express with radio at 100 watts USB it 
shows
VFWD:675  VRFL:50
Appreciate if someone can explain the numbers

Tnx,
Jack
W4GRJ

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Re: [Elecraft] [KX3] A BNC Connector to consider for your KX2 / KX3

[Mark Goldberg]

And as someone who has built several Baluns, these do not even say what the
impedance ratio is. A good Balun will have the right impedance ratio for
the intended job, and the right internal impedance between the pairs of
wires on the cores to provide a low return loss. It is not easy to get good
performance over the full 160 to 6 meter range. These do not look like a
good choice, unless you want to lose lots of signal in the Balun.

73,

Mark
W7MLG

On Jan 23, 2017 7:50 AM, "Ken G Kopp"  wrote:

>From a career comm tech ... me.

75 ohm BNC's -are- different and have smaller center pins.

In addition, the power ratings of video -and- TV baluns are miniscule ...
even for QRP use.

73
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Re: [Elecraft] [KX3] A BNC Connector to consider for your KX2 / KX3

[Ken G Kopp]

From a career comm tech ... me.

75 ohm BNC's -are- different and have smaller center pins.

In addition, the power ratings of video -and- TV baluns are miniscule ...
even for QRP use.

73

On Jan 22, 2017 20:18, "Bill Miner w...@yahoo.com [KX3]" <
kx3-nore...@yahoogroups.com> wrote:

>
>
> Video coax and connectors are usually 75 ohms.  75 ohm connectors have a
> smaller center pin that may not make a good connection in a 50 ohm
> connector.
>
> Bill- K6WLM
>
> Sent from my iPad
>
> On Jan 22, 2017, at 2:35 PM, szetm...@yahoo.com [KX3] <
> kx3-nore...@yahoogroups.com> wrote:
>
>
>
> 10pcs Coaxial Security Camera Male BNC Video Balun Connector for CCTV
> camera
> 
> [image: image]
> 
> 10pcs Coaxial Security Camera Male BNC Video B...
> 
> 10pcs Coaxial Security Camera Male BNC Video Balun Connector for CCTV
> camera in Consumer Electronics, Home Surveillance, Cables, Adapters &
> Conn...
> View on www.ebay.com
> 
> Preview by Yahoo
>
>
>
> John WU1K
>
> __._,_.___
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Re: [Elecraft] Elecraft Digest, KXPA100 RF feedback

[Dave B via Elecraft]

On 23/01/17 02:23, elecraft-requ...@mailman.qth.net wrote:
> From: E T 
> To: donw...@embarqmail.com
> Cc: Elecraft Reflector Reflector 
> Subject: Re: [Elecraft] KXPA100 RF feedback
> Message-ID: 
> Content-Type: text/plain; charset=us-ascii
>
> Not sure what it was but I seem to have inadvertently fixed it.  I took the 
> amp out to my Jeep and hooked it up with my KX2 to my screwdriver antenna and 
> could not reproduce the issue.  I brought it back inside and hooked it back 
> up and it is working ok, so it must have been a loose connection or 
> something, even though I thought I had unhooked and reconnected everything...
>
> In the immortal words of Emily Litella, "Never mind!"  :-)
>
>   Thanks and 73,
>   Erik Tkal  -  W1QED

Hi.

You probably have a bad coax-to-connector problem somewhere.

If you're using PL259 type connectors, even commercially made and
moulded types, it's not uncommon.   The outer braid becomes detached at
the point where the cable enters the connector.

All too common a failing of those things, especially where cheap (braid
over foil) type coax is used.  (Cheap to the manufacturers, not to you
when you perhaps bought a ready made lead...)

Hope you find it.   A simple loop or very short dipole and diode probe
can help.  Run the system at a lowish power where it will run without
tripping, move the probe around the cables/connectors.  You'll find any
leakage that way.   A good cable will hardly indicate, a faulty one will
be "quite lively"...

73.

Dave G0WBX.

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