Re: [Elecraft] KX3 TX inhibit ?

[Matt VK2RQ]

Easiest way is to set the power output to "0W" -- this will prevent the KX3 
from generating any RF.

73, Matt VK2RQ

On 02/10/2013, at 4:33 PM, "HB9CAT"  wrote:

> All,
> 
> 
> 
> I plan to use my KX3 for RX only, connected to a 2m downconverter; I want to
> be 100% sure that no power gets transmitted because of a n accidental
> manipulation; is it possible to inhibit the trasmitter ?
> 
> I didn't find any hint in the manual.
> 
> 
> 
> Marco HB9CAT
> 
> __
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[Elecraft] R: KX3 TX inhibit ?

[HB9CAT]

Thanks Matt, that's what I do today. 
Still, the potentiometer could accidentally be turned, I'm looking for a
harder lock, multi-op-proof.

Marco HB9CAT

-Messaggio originale-
Da: Matt VK2RQ [mailto:matt.vk...@gmail.com] 
Inviato: mercoledì, 2. ottobre 2013 09:35
A: HB9CAT
Cc: elecraft@mailman.qth.net
Oggetto: Re: [Elecraft] KX3 TX inhibit ?

Easiest way is to set the power output to "0W" -- this will prevent the KX3
from generating any RF.

73, Matt VK2RQ

On 02/10/2013, at 4:33 PM, "HB9CAT"  wrote:

> All,
> 
> 
> 
> I plan to use my KX3 for RX only, connected to a 2m downconverter; I 
> want to be 100% sure that no power gets transmitted because of a n 
> accidental manipulation; is it possible to inhibit the trasmitter ?
> 
> I didn't find any hint in the manual.
> 
> 
> 
> Marco HB9CAT
> 
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 
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> list: http://www.qsl.net/donate.html


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Re: [Elecraft] Random wires

[Edward R Cole]

I had to calculate my radiation resistance to comply with the license 
requirements on 600m.


My antenna is a base loaded inverted-L: 43-feet high and 122-feet 
long*.  Radiation resistance was taken from a EZ-NEC model as 0.83 
ohms.  Ground resistance was measured with an antenna analyzer as 18 ohms.


efficiency = 0.83/18 = 0.046  Running transmitter output of 100w, 
Total Power Radiated = 100*0.046 = 4.6w

EIRP = 4.6*1.48 = 6.8w   anti-Log (1.7 dB) = 1.48, gain = 1.7 dB
ERP = EIRP/1.64 = 4.15w which is the parameter wanted by the 
licensing authority.


go to: http://www.kl7uw.com/600m.htm
click on the EzNec model for the antenna analysis and ERP calculation 
for the rest.


*Note the antenna was shortened from 130 to 122 feet to improve 
tension on the top-hat section.


73, Ed - KL7UW
http://www.kl7uw.com
dubus...@gmail.com
"Kits made by KL7UW" 


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Re: [Elecraft] KX3 TX inhibit ?

[Mooneer Salem]

If you have the packet cable kit, you can ground the ACC2 line and set the
ACC2 IO menu option to LO=Inh (see page 35 of the manual for details).

-Mooneer KG6AOV


On Tue, Oct 1, 2013 at 11:33 PM, HB9CAT  wrote:

> All,
>
>
>
> I plan to use my KX3 for RX only, connected to a 2m downconverter; I want
> to
> be 100% sure that no power gets transmitted because of a n accidental
> manipulation; is it possible to inhibit the trasmitter ?
>
> I didn't find any hint in the manual.
>
>
>
> Marco HB9CAT
>
> __
> Elecraft mailing list
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>
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[Elecraft] R: KX3 TX inhibit ?

[HB9CAT]

Thanks Mooner,

 

I would have preferred a menu option but you are right; I do have the cable
kit, if a shorted 3.5mm jack will be seen as LO I could use that as a kind
of Hardware-lock.

 

Thanks for the hint !

 

Marco HB9CAT 

 

Da: Mooneer Salem [mailto:moon...@gmail.com] 
Inviato: mercoledì, 2. ottobre 2013 10:25
A: HB9CAT; elecraft@mailman.qth.net
Oggetto: Re: [Elecraft] KX3 TX inhibit ?

 

If you have the packet cable kit, you can ground the ACC2 line and set the
ACC2 IO menu option to LO=Inh (see page 35 of the manual for details).

 

-Mooneer KG6AOV

 

On Tue, Oct 1, 2013 at 11:33 PM, HB9CAT  wrote:

All,



I plan to use my KX3 for RX only, connected to a 2m downconverter; I want to
be 100% sure that no power gets transmitted because of a n accidental
manipulation; is it possible to inhibit the trasmitter ?

I didn't find any hint in the manual.



Marco HB9CAT

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Re: [Elecraft] Side KX Parts for KX3

[Dave]

Any plans to export ?


From the website it looks like USA only.


Cheers - Dave (G0DJA)
- Original Message - 
From: "Scott Bastian"

Sent: Wednesday, October 02, 2013 2:02 AM
Subject: [Elecraft] Side KX Parts for KX3


Howdy group, I am posting a link to my web page for replacement end panels 
and a new cover for the radio.


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Re: [Elecraft] R: KX3 TX inhibit ?

[Dave]

On my KX3 I have to push in and hold the "PWR" (KEYER/MIC control) button to 
get to the power settings.  So, unless you accidentally press and hold, and 
you will then see PWR displayed, I can't see how it can accidentally be 
changed?


Dave (G0DJA)

- Original Message - 
From: "HB9CAT"

Cc: 
Sent: Wednesday, October 02, 2013 7:44 AM
Subject: [Elecraft] R: KX3 TX inhibit ?


Thanks Matt, that's what I do today.
Still, the potentiometer could accidentally be turned, I'm looking for a
harder lock, multi-op-proof.

Marco HB9CAT

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[Elecraft] R: R: KX3 TX inhibit ?

[HB9CAT]

Fair point Dave, but let's assume I want to modify the PBT I/II and press
the wrong button; that did happen to me a few times.

And particularly in a multioperator contest environment I must assume the
worst case and have a foolproof solution.
Missing a software setting I'll try the ACC2 solution.

Marco HB9CAT

-Messaggio originale-
Da: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] Per conto di Dave
Inviato: mercoledì, 2. ottobre 2013 11:52
A: elecraft@mailman.qth.net
Oggetto: Re: [Elecraft] R: KX3 TX inhibit ?

On my KX3 I have to push in and hold the "PWR" (KEYER/MIC control) button to
get to the power settings.  So, unless you accidentally press and hold, and
you will then see PWR displayed, I can't see how it can accidentally be
changed?

Dave (G0DJA)

- Original Message -
From: "HB9CAT"
Cc: 
Sent: Wednesday, October 02, 2013 7:44 AM
Subject: [Elecraft] R: KX3 TX inhibit ?


Thanks Matt, that's what I do today.
Still, the potentiometer could accidentally be turned, I'm looking for a
harder lock, multi-op-proof.

Marco HB9CAT

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Re: [Elecraft] R: KX3 TX inhibit ?

[Dave]

I guess if you are letting oher people use the rig there's always a danger 
that they might accidentally mess it up !!


I did hear a story about someone who got their 70cm radio back after a 
contest, which had N-Type sockets for the antenna, where someone had forced 
a PL-259 into the socket!  So, I can see why you would want a fool-proof 
solution in those cases...


Dave (G0DJA)

- Original Message - 
From: "HB9CAT" Sent: Wednesday, October 02, 2013 9:59 AM

Subject: R: [Elecraft] R: KX3 TX inhibit ?


Fair point Dave, but let's assume I want to modify the PBT I/II and press
the wrong button; that did happen to me a few times.

And particularly in a multioperator contest environment I must assume the
worst case and have a foolproof solution.
Missing a software setting I'll try the ACC2 solution.

Marco HB9CAT

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[Elecraft] R: KX3 TX inhibit ?

[HB9CAT]

It works, plugging a shorted 3.5 jack into the ACC2 Module inhibits TX, the
“TX” in the display blinks to reflect that J

 

Marco HB9CAT

 

Da: Mooneer Salem [mailto:moon...@gmail.com] 
Inviato: mercoledì, 2. ottobre 2013 10:25
A: HB9CAT; elecraft@mailman.qth.net
Oggetto: Re: [Elecraft] KX3 TX inhibit ?

 

If you have the packet cable kit, you can ground the ACC2 line and set the
ACC2 IO menu option to LO=Inh (see page 35 of the manual for details).

 

-Mooneer KG6AOV

 

On Tue, Oct 1, 2013 at 11:33 PM, HB9CAT  wrote:

All,



I plan to use my KX3 for RX only, connected to a 2m downconverter; I want to
be 100% sure that no power gets transmitted because of a n accidental
manipulation; is it possible to inhibit the trasmitter ?

I didn't find any hint in the manual.



Marco HB9CAT

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Re: [Elecraft] R: KX3 TX inhibit ?

[Dave]

Now all you need is a way to securly lock the 3.5mm jack plug in!

Experience of past contests/Special Event stations tells me that people are 
strange creatures and do things that seem illogical.  Like pulling out plugs 
that they don't know what it does...


Anyway, I'll also make up a 3.5mm short circuit jack plug as well for times 
when I do not want to accidentally transmit.


Dave (G0DJA)

- Original Message - 
From: "HB9CAT"

Sent: Wednesday, October 02, 2013 10:30 AM
Subject: [Elecraft] R: KX3 TX inhibit ?


It works, plugging a shorted 3.5 jack into the ACC2 Module inhibits TX, 
the

"TX" in the display blinks to reflect that J




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Re: [Elecraft] R: KX3 TX inhibit ?

[Win Kriegl DK9IP/KH7CD]

Perhaps it will be enough to set menue to "low=inh" without plugging in a shorted jack at 
ACC2. My K3 works that way because the INH input is low by default.


73, Win DK9IP



Am 02.10.2013 13:00, schrieb Dave:

Now all you need is a way to securly lock the 3.5mm jack plug in!

Experience of past contests/Special Event stations tells me that people are 
strange
creatures and do things that seem illogical.  Like pulling out plugs that they 
don't know
what it does...

Anyway, I'll also make up a 3.5mm short circuit jack plug as well for times 
when I do not
want to accidentally transmit.

Dave (G0DJA)

- Original Message - From: "HB9CAT"
Sent: Wednesday, October 02, 2013 10:30 AM
Subject: [Elecraft] R: KX3 TX inhibit ?



It works, plugging a shorted 3.5 jack into the ACC2 Module inhibits TX, the
"TX" in the display blinks to reflect that J




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[Elecraft] R: R: KX3 TX inhibit ?

[HB9CAT]

Thanks Win,

tried that, the inhibit is triggered only setting "low=inh" AND with the
shorted jack effectively plugged in.

I'd personally prefer Elecraft to add a menu item for this, but I realized
that it could potentially cause a pretty high number of trouble tickets /
returns because of "broken" TX.

73,
Marco HB9CAT

-Messaggio originale-
Da: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] Per conto di Win Kriegl
DK9IP/KH7CD
Inviato: mercoledì, 2. ottobre 2013 13:10
A: elecraft@mailman.qth.net
Oggetto: Re: [Elecraft] R: KX3 TX inhibit ?

Perhaps it will be enough to set menue to "low=inh" without plugging in a
shorted jack at ACC2. My K3 works that way because the INH input is low by
default.

73, Win DK9IP



Am 02.10.2013 13:00, schrieb Dave:
> Now all you need is a way to securly lock the 3.5mm jack plug in!
>
> Experience of past contests/Special Event stations tells me that 
> people are strange creatures and do things that seem illogical.  Like 
> pulling out plugs that they don't know what it does...
>
> Anyway, I'll also make up a 3.5mm short circuit jack plug as well for 
> times when I do not want to accidentally transmit.
>
> Dave (G0DJA)
>
> - Original Message - From: "HB9CAT"
> Sent: Wednesday, October 02, 2013 10:30 AM
> Subject: [Elecraft] R: KX3 TX inhibit ?
>
>
>> It works, plugging a shorted 3.5 jack into the ACC2 Module inhibits 
>> TX, the "TX" in the display blinks to reflect that J
>
>
>
> __
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Re: [Elecraft] Random wires

[WILLIS COOKE]

I like to think of an Inverted L as a vertical antenna and a horizontal wire 
matching device.  This is not entirely accurate, but is close enough for 
contact distances over 2000 miles.  An examination of patterns with EZNEC will 
help you put this into perspective.  The vertical portion is the difficult to 
erect portion of the inverted L and does most of the radiating for DX.  The 
pattern is much like a short vertical for lower frequencies where the vertical 
length is usually much less than one quarter wave length, but the horizontal 
portion will raise the radiation resistance from usually single digits to 
nearer 50 ohms and increase the current in the vertical leg, thus give you more 
low angle signal.  For higher frequencies where antenna vertical lengths 
greater than one quarter wave and radiation resistance more than 36 ohms or 
sometimes much less.  An inverted L is often a good choice for 160 meters and 
sometimes 80 meters for those of us who
 cannot erect a 250 foot vertical to get an optimum low angle signal.  A 120 
foot vertical is a good compromise and 15 or so ohms of ground resistance is a 
good counterpoise for a near 50 ohm match, but if that is not doable a 60 foot 
vertical and a 60 or so foot horizontal leg is a decent antenna with a more 
reasonable cost.  If your operating frequency is higher then the inverted L is 
attractive only under special circumstances such as emergency, portable or 
antenna restrictions.
 
Willis 'Cookie' Cooke 
K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart



 From: David Gilbert 
To: elecraft@mailman.qth.net 
Sent: Tuesday, October 1, 2013 5:09 PM
Subject: Re: [Elecraft] Random wires
 


I suggest reading W8JI ... and others.

http://www.w8ji.com/radiation_resistance.htm

Dave   AB7E



On 10/1/2013 2:53 PM, k3...@comcast.net wrote:
> Sorry roger, Roger, your analysis is not totally correct. You do raise the 
> feed impedence from 36 Ohms as compared to using a single 1/4 wave wire over 
> perfect ground. As most of us do not have perfect ground, there is an 
> imperfect representation of the virtual 1/4. Because it is imperfect, you can 
> look at this part as absorbing energy and just returning heat. By raising the 
> radiation impedance, less energy is absorbed by ground and more is radiated. 
> How much additional efficiency do you obtain is a matter of the ground system 
> you put in and the ground constants under it. In my experience, it is worth 
> the effort to build the antenna as it will outperform a similar single wire 
> inverted L. I suggest reading Bill Orr, and others, on this antenna.
>
> 73,
> Barry
> K3NDM
>
> - Original Message -
>
> From: "Roger D Johnson" 
> To: elecraft@mailman.qth.net
> Sent: Tuesday, October 1, 2013 3:40:49 PM
> Subject: Re: [Elecraft] Random wires
>
> This is NOT true! It merely raises the feedpoint impedance...just the same as
> adding a
> 4-1 transformer.
>
> 73, Roger
>
>
> On 10/1/2013 3:10 PM, Barry LaZar wrote:
>>
>> As I read your post, I infer that at the moment you are wanting to add 160
>> meters to your capability. An antenna that I have used and liked is the Twin
>> Lead Marconi. It's a simple, cheap, and effective antenna. I first saw it
>> written up by Bill Orr years ago. The premise of the design is that a quarter
>> wave antenna driven against ground may not be the most efficient antenna due
>> to low radiation resistance. Therefore, raise the radiation resistance by
>> using the theory of a folded dipole. The folded element raises the radiation
>> resistance by a factor of 4 for 2 elements as the impedance changes as the
>> square of the number of elements. You will still need radials, but your 
>> ground
>> losses will decrease.
>>
>>
>> 73,
>> Barry
>> K3NDM
>>
>>

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[Elecraft] Trade 706MkIIG for KX3 or K2

[Mike Short]

Long Shot, but I am looking to  trade a MKIIG with separation kit, mic, LDG
remote tuner, data cables, etc for a KX3 or K2. Everything works fine. I
will pay shipping.

Mike
AI4NS
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Re: [Elecraft] Random wires

[KU4AF]

You're slightly more QRP than you think. Efficiency is radiation resistance
divided by total resistance (not ground resistance). So your calculation
should be:

efficiency = 0.83/(18+0.83) = 0.044  Running transmitter output of 100w, 
Total Power Radiated = 100*0.044 = 4.4w
EIRP = 4.4*1.48 = 6.5w   anti-Log (1.7 dB) = 1.48, gain = 1.7 dB
ERP = EIRP/1.64 = 3.98w

John, KU4AF
Pittsboro, NC


My antenna is a base loaded inverted-L: 43-feet high and 122-feet 
long*.  Radiation resistance was taken from a EZ-NEC model as 0.83 
ohms.  Ground resistance was measured with an antenna analyzer as 18 ohms.

efficiency = 0.83/18 = 0.046  Running transmitter output of 100w, 
Total Power Radiated = 100*0.046 = 4.6w
EIRP = 4.6*1.48 = 6.8w   anti-Log (1.7 dB) = 1.48, gain = 1.7 dB
ERP = EIRP/1.64 = 4.15w which is the parameter wanted by the 
licensing authority.




--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Random-wires-tp7579451p7579497.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Random wires

[Barry LaZar]

Everybody,
I see a real problem here. Please someone open up the authority, 
Krause, and see what he says. His work is the basis of a whole lot of 
what we have today.


73,
Barry
K3NDM


On 10/1/2013 10:55 PM, Bob Cunnings wrote:

Here's a link to the W8JI radiation resistance topic:

http://www.w8ji.com/radiation_resistance.htm

where the antenna efficiency issue is analyzed - using a 1/4 long
folded radiator as the example. In this analysis the antenna efficiency
is unchanged because total power and ground loss power terms remain
constant.

Bob NW8L

On Tue, 1 Oct 2013 14:48:55 -0700
"Ron D'Eau Claire"  wrote:


The important value is the resistance at the feed point of the
radiator, independent of any matching devices used.

Adding a 4:1 or other transformer is simply adjusting the impedance
the feed line sees, like any other matching network you might use. It
has no effect on the feed point resistance of the antenna.

A 1/4 wave long folded radiator has a feed point resistance of 4x the
typical 1/4 wavelength radiator, quite independent of the ground
system. Hence the efficiency is higher.

73, Ron AC7AC


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[Elecraft] Fun with CM 500 headset

[Tom Field]

I just finished installing the Yamaha CM 500 headset for SSB in my newly
constructed K2. Using VOX, I find the microphone is so sensitive that it
switches to transmit based on the very quiet sound levels in the room. If I
switch the Vox delay from .1 to .4 sec, and hold the microphone completely
enclosed in my hand, I can (mostly) block VOX activation. Is there a way to
decrease Vox sensitivity so I will only trigger transmit when speaking.
Have yet to make SSB contact.

Tom
KI6NRD
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Re: [Elecraft] Random wires

[David Gilbert]

What do you expect Krause will tell you?  That feedpoint impedance and 
radiation resistance are the same thing??   I guarantee that it will not.


Did you not understand that feedpoint transformations transform the 
combination of all impedances present at that point, and therefore leave 
the relative magnitude of the various components (and therefore the 
efficiency of the system) the same??  Or are you somehow of the opinion 
that a folded element is not a feedpoint transformation??   I'm really 
having trouble understanding your logic here.


Dave   AB7E



On 10/2/2013 9:26 AM, Barry LaZar wrote:

Everybody,
I see a real problem here. Please someone open up the authority, 
Krause, and see what he says. His work is the basis of a whole lot of 
what we have today.


73,
Barry
K3NDM


On 10/1/2013 10:55 PM, Bob Cunnings wrote:

Here's a link to the W8JI radiation resistance topic:

http://www.w8ji.com/radiation_resistance.htm

where the antenna efficiency issue is analyzed - using a 1/4 long
folded radiator as the example. In this analysis the antenna efficiency
is unchanged because total power and ground loss power terms remain
constant.

Bob NW8L

On Tue, 1 Oct 2013 14:48:55 -0700
"Ron D'Eau Claire"  wrote:


The important value is the resistance at the feed point of the
radiator, independent of any matching devices used.

Adding a 4:1 or other transformer is simply adjusting the impedance
the feed line sees, like any other matching network you might use. It
has no effect on the feed point resistance of the antenna.

A 1/4 wave long folded radiator has a feed point resistance of 4x the
typical 1/4 wavelength radiator, quite independent of the ground
system. Hence the efficiency is higher.

73, Ron AC7AC


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Re: [Elecraft] Side KX Parts for KX3

[VaibhaV Sharma]

Excellent product! I am about to order my set.

Just a nitpick -
This group is full of people (including me) spoilt by excellent pictures +
detailed instructions for any kind of Elecraft related (dis)assembly.
Although very simple, I saw one page install instructions on the Side KX
parts and did not read beyond the second line. :)

73s,

-- 
VaibhaV Sharma
W7VAI



On Tue, Oct 1, 2013 at 7:02 PM, Scott Bastian  wrote:

> Howdy group, I am posting a link to my web page for replacement end panels
> and a new cover for the radio.
>
> http://www.gemsproducts.com/
>
> Thanks. Scott AK6Q
>
> ( webmaster if this is violation of any rules please remove the post and
> and vise me... thanks)
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Re: [Elecraft] Random wires

[Barry LaZar]

No. I expected someone who is an engineer and commands the language 
better than I to explain that they are not the same and how they fit 
together thereby adding a little enlightenment to this thread.


73,
Barry
K3NDM

On 10/2/2013 1:07 PM, David Gilbert wrote:


What do you expect Krause will tell you?  That feedpoint impedance and 
radiation resistance are the same thing??   I guarantee that it will not.


Did you not understand that feedpoint transformations transform the 
combination of all impedances present at that point, and therefore 
leave the relative magnitude of the various components (and therefore 
the efficiency of the system) the same??  Or are you somehow of the 
opinion that a folded element is not a feedpoint transformation??   
I'm really having trouble understanding your logic here.


Dave   AB7E



On 10/2/2013 9:26 AM, Barry LaZar wrote:

Everybody,
I see a real problem here. Please someone open up the authority, 
Krause, and see what he says. His work is the basis of a whole lot of 
what we have today.


73,
Barry
K3NDM


On 10/1/2013 10:55 PM, Bob Cunnings wrote:

Here's a link to the W8JI radiation resistance topic:

http://www.w8ji.com/radiation_resistance.htm

where the antenna efficiency issue is analyzed - using a 1/4 long
folded radiator as the example. In this analysis the antenna efficiency
is unchanged because total power and ground loss power terms remain
constant.

Bob NW8L

On Tue, 1 Oct 2013 14:48:55 -0700
"Ron D'Eau Claire"  wrote:


The important value is the resistance at the feed point of the
radiator, independent of any matching devices used.

Adding a 4:1 or other transformer is simply adjusting the impedance
the feed line sees, like any other matching network you might use. It
has no effect on the feed point resistance of the antenna.

A 1/4 wave long folded radiator has a feed point resistance of 4x the
typical 1/4 wavelength radiator, quite independent of the ground
system. Hence the efficiency is higher.

73, Ron AC7AC


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Re: [Elecraft] Random wires

[tom armour]

This comment made me do a search on Kraus.
I found one of his books online for free in the open source archive.org site 
(this is the streaming link, they also have it in 
PDF):http://archive.org/stream/Antennas2ndbyjohnD.Kraus1988/Kraus-Antennas-2nd.Edition-1988#page/n0/mode/2up
I though others might like to look at it.
73 - Tom - wa4ta

> Date: Wed, 2 Oct 2013 13:36:36 -0400
> From: k3...@comcast.net
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Random wires
> 
> No. I expected someone who is an engineer and commands the language 
> better than I to explain that they are not the same and how they fit 
> together thereby adding a little enlightenment to this thread.
> 
> 73,
> Barry
> K3NDM
> 
> On 10/2/2013 1:07 PM, David Gilbert wrote:
> >
> > What do you expect Krause will tell you?  That feedpoint impedance and 
> > radiation resistance are the same thing??   I guarantee that it will not.
> >
> > Did you not understand that feedpoint transformations transform the 
> > combination of all impedances present at that point, and therefore 
> > leave the relative magnitude of the various components (and therefore 
> > the efficiency of the system) the same??  Or are you somehow of the 
> > opinion that a folded element is not a feedpoint transformation??   
> > I'm really having trouble understanding your logic here.
> >
> > Dave   AB7E
> >
> >
> >
> > On 10/2/2013 9:26 AM, Barry LaZar wrote:
> >> Everybody,
> >> I see a real problem here. Please someone open up the authority, 
> >> Krause, and see what he says. His work is the basis of a whole lot of 
> >> what we have today.
> >>
> >> 73,
> >> Barry
> >> K3NDM
> >>
> >>
> >> On 10/1/2013 10:55 PM, Bob Cunnings wrote:
> >>> Here's a link to the W8JI radiation resistance topic:
> >>>
> >>> http://www.w8ji.com/radiation_resistance.htm
> >>>
> >>> where the antenna efficiency issue is analyzed - using a 1/4 long
> >>> folded radiator as the example. In this analysis the antenna efficiency
> >>> is unchanged because total power and ground loss power terms remain
> >>> constant.
> >>>
> >>> Bob NW8L
> >>>
> >>> On Tue, 1 Oct 2013 14:48:55 -0700
> >>> "Ron D'Eau Claire"  wrote:
> >>>
>  The important value is the resistance at the feed point of the
>  radiator, independent of any matching devices used.
> 
>  Adding a 4:1 or other transformer is simply adjusting the impedance
>  the feed line sees, like any other matching network you might use. It
>  has no effect on the feed point resistance of the antenna.
> 
>  A 1/4 wave long folded radiator has a feed point resistance of 4x the
>  typical 1/4 wavelength radiator, quite independent of the ground
>  system. Hence the efficiency is higher.
> 
>  73, Ron AC7AC
> 
> >>> __
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> >>
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[Elecraft] KX3 S meter calibration

[robertsm...@vom.com]

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Re: [Elecraft] Random wires

[Edward R Cole]

John,

Thankyou for the correction in the formula.   In fact the 18-ohms 
measured by the antenna analyzer is the total resistance and includes 
both radiation resistance and ground resistance, so my numbers are 
correct, just not my explanation of them.


This was done three years ago and I forgot some of it.  Like others 
have observed not something calculated everyday.
Direct measurement of radiation resistance is the difficult part, so 
this provides the required calculation with the normal uncertainty of 
antenna modeling.


One can understand the problem of installing a quarter-wave vertical 
on 500-KHz which would be 415 foot tall.  I do not have the resources 
for really tall antenna (even 200-foot would be nice), so the top 
loading of the inverted-L is one of the standard antenna for low-low 
bands.  Then one considers quarter-wave radials - you need some real estate!


Yet even with this obvious compromise my signal has been detected 
2800 miles running only 4.15w ERP.  The new ham band will likely only 
permit 1w to 5w ERP so this is in the ball-park of what is possible.


73, Ed - KL7UW, WD2XSH/45
-
From: KU4AF 
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Random wires
Message-ID: <1380722616031-7579497.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii

You're slightly more QRP than you think. Efficiency is radiation resistance
divided by total resistance (not ground resistance). So your calculation
should be:



73, Ed - KL7UW
http://www.kl7uw.com
dubus...@gmail.com
"Kits made by KL7UW" 


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Re: [Elecraft] Random wires

[Jim Brown]

On 10/2/2013 10:36 AM, Barry LaZar wrote:
No. I expected someone who is an engineer and commands the language 
better than I to explain that they are not the same and how they fit 
together thereby adding a little enlightenment to this thread. 


Since this is the Elecraft reflector, the discussion has wandered pretty 
far off topic. Dave, Willis, Ed, and I have jumped in to correct some 
serious misconceptions, but that's about as far as I'm prepared to 
stretch our welcome. :)


73, Jim K9YC
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[Elecraft] K2

[Tomy]

Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without 
hurting it? 
 

73! Tomy Ivan KF7GC
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Re: [Elecraft] R: R: KX3 TX inhibit ?

[gt-i]

Marco,
I had the idea of using some CAT-command to do so, but couldn't find a 
specific one in the manual.
There is, of course "RX;" and "PCxx;", which would have to be sent 
frequently. The VOX state command is commented as "GET only, SET is 
planned".


In Win-Test, for example, you could assign a script to all Fx- keys, the 
script looks like

wtRadio:Send("RX;")
wtRadio:Send("PC000;")
return -1

Happy contesting!
73
Gernot, DF5RF

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Re: [Elecraft] K2

[Ariel Jacala]

It is much easier to do with a K2 /100 dialed back to 5 watts of drive

Ariel NY4G

Sent from my iPhone

On Oct 2, 2013, at 6:35 PM, "Tomy"  wrote:

> Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without 
> hurting it? 
>  
> 
> 73! Tomy Ivan KF7GC
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[Elecraft] [K3] 700 Hz 8-Pole Filters by INRAD -- Get Them While They Last

[Gary W. Hvizdak]

INRAD reports that batches four and five are now in US customs!  These
special-order filters have been backordered since early July and most of
them have already been sold.  However, a handful are still available for
purchase on a first-come-first-served basis.
 
It's impossible to say how quickly they'll sell out.  They might be gone in
a matter of hours of this post, or they might not sell out until after we
receive them?
 
Please visit http://www.unpcbs.com for full details, including:  ordering
instructions; user comments; retail price; S&H charges; passband plot; FAQs;
and app notes.
 
73,
Gary  KI4GGX
(webmaster)
 
P.S.  INRAD hopes to ship the filters within a week or two.  (Apparently
they will be delayed in US customs due to the government shutdown.)
 
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[Elecraft] KX3 S meter calibration

[robertsm...@vom.com]

I'm sure this question has been asked before, but I can't find any information 
about it.

In measuring the calibration of the S-meter in my KX3, I discovered it is 
extremely 
accurate, but only with the pre-amp engaged. With it engaged, S9 is indicated 
at 
exactly 50 uV (within the resolution of the display).  It is also very accurate 
up 
and down the S-meter range, with 6dB corresponding exactly to an S unit.  

I would have expected it to be calibrated with both the pre-amp and attenuator 
disengaged.  Is there some reason it's calibrated this way?

Also, when the firuware is available that automatically accounts for engaging 
the 
pre-amp or attenuator, will the indication be referenced to the pre-amp on or 
off?
 
Bob Smith, NY4Y


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Re: [Elecraft] [K3] 700 Hz 8-Pole Filters by INRAD -- Get Them While They Last

[F5vjc]

The magic INRAD  700Hz 8 Pole inobtanium filter ! Oh come on...


On 3 October 2013 00:51, Gary W. Hvizdak  wrote:

> INRAD reports that batches four and five are now in US customs!  These
> special-order filters have been backordered since early July and most of
> them have already been sold.  However, a handful are still available for
> purchase on a first-come-first-served basis.
>
> It's impossible to say how quickly they'll sell out.  They might be gone in
> a matter of hours of this post, or they might not sell out until after we
> receive them?
>
> Please visit http://www.unpcbs.com for full details, including:  ordering
> instructions; user comments; retail price; S&H charges; passband plot;
> FAQs;
> and app notes.
>
> 73,
> Gary  KI4GGX
> (webmaster)
>
> P.S.  INRAD hopes to ship the filters within a week or two.  (Apparently
> they will be delayed in US customs due to the government shutdown.)
>
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Re: [Elecraft] K2

[Don Wilhelm]

Tomy,

The K2/10 will have to be equipped with an amplifier keying circuit.
The keying circuits that have been publicized will handle a positive 
keying voltage.  Check the specs for the AL80B to see if the PTT voltage 
is positive or negative.
If it is negative, you will have to add a keying relay between the K2 
Amp Keying Circuit and the Amplifier.


If you already have the amplifier, you can check the PTT keying voltage 
with your DMM.  Connect the DMM to the PTT input of the amplifier - the 
DMM will show you the keying voltage and the polarity.  Then set the DMM 
to read current, and connect the leads between the amp PTT input and 
amplifier ground - the amp should key and the DMM should indicate the 
current required by the amp's PTT input.


Prepare your K2 amp keying circuit according to those measurements.

73,
Don W3FPR

On 10/2/2013 6:34 PM, Tomy wrote:

Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without 
hurting it?
  


73! Tomy Ivan KF7GC



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Re: [Elecraft] K2

[Robert G Strickland]

I'm sure Don Wilhelm can give the best answer to this one. The K2 puts 
out 10ish watts max, so the output of the amp will be limited by this 
drive level. Most amps - I'm not an expert at this - require a bit more 
drive to get them to their ultimate capacity, so the K2 may under-drive 
the amp in question. A more irksome problem will probably be how to 
manage T-R switching in the amp. The K2 doesn't have a port to connect 
to an amp T-R line. With the K100 amp installed in the K2, there is a 
line for T-R amp switching. Also, the K100 will no doubt be able to 
drive the amp to its full rating. I used the K2 w/ amp to drive a 500w 
tube amp without any problems. That I know. With the K100, the K2 covers 
everything from micro power up to the standard 100w in a very small, 
high performance package. When I got my K3 I sure hung on to my K2/100. 
Buying a Ferrari is no reason to sell the MG. Good luck.


...robert

On 10/2/2013 22:48, Ariel Jacala wrote:

It is much easier to do with a K2 /100 dialed back to 5 watts of drive

Ariel NY4G

Sent from my iPhone

On Oct 2, 2013, at 6:35 PM, "Tomy"  wrote:


Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without 
hurting it?


73! Tomy Ivan KF7GC
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--
Robert G Strickland, PhD ABPH - KE2WY
rc...@verizon.net.usa
Syracuse, New York, USA
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Re: [Elecraft] K2

[Vic K2VCO]

Here is a circuit for an amp key circuit that can be added to the K2:



The stock AL80B has a low-voltage positive key line. Just to be sure -- perhaps it's been 
modified -- it's a good idea to measure it before connecting it.


You will get a couple of hundred watts from the AL80B depending on the band.

On 10/2/2013 3:34 PM, Tomy wrote:

Can  K2/10 be fed directly to an amplifier like the Ameritron AL 80B, without 
hurting it?


--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Elecraft] [KX3] VOX Delay with CW in SSB

[Jimk8mr]

I posted a query a few weeks back but neglected to say for which  radio.
 
The KX3, FW 1.61, with CW in SSB seems to allow only full break-in  
operation. This is a problem when using a transverter or amplifier not  
designed 
for break in.
 
Am I missing something, or is this in need of an FW revision? I would  
think using the CW delay times when transmitting CW in SSB would make the  most 
sense. (If CW was set for zero delay, full break-in would still be  
available).
 
 
73  -  Jim   K8MR
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[Elecraft] Pauli Nunez, EA3BLQ K2DI v.III and K2DI-PCI boards

[Robin Bayer]

K2 enthusiasts,

I'm looking for a self-contained system for fixed audio, mike header
extender and sound card and really like the looks of Pauli Nunez, EA3BLQ's
K2DI v.III and K2DI-PCI boards.

 

Has anyone had any experience using this set-up, 

and does anyone know a source for these double-sided boards?

 

I believe I might use a NUE-PSK for a compact digital and portable K2/10.
Having decided to be happy with building modules and mods for my k2 rather
than buying that KX3 or K3.for now anyway.

 

Thanks for your consideration,

KA5QQA, Robin Bayer

 

Ps. Anyone ever try using the K2 S meter as a CWT.just thinkin

 

 

 

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