Re: [Elecraft] My KX3 Battery Approach

2014-07-15 Thread KB9WMJ 
Well, I know there is an AA size Li-ion battery, as I have them in my You 
Kits FG-01 Antenna Analyzer.  It lists the 18650, but I see that's a 19 x 
67mm battery.

14500 is 14 x 50mm, so it is the AA sized one.

I know I have used the 18650's as well, as they have lots of current


- Original Message - 
From: "John Payne" 
To: 
Sent: Monday, July 14, 2014 10:03 AM
Subject: Re: [Elecraft] My KX3 Battery Approach


Unfortunately, those are NOT AA size cells.  18650 cells are much larger.

See <http://happypics.zapto.org/displayimage.php?pid=3026>

73 de W4CWZ

On 7/13/2014 5:58 PM, kb9...@wi.rr.com wrote:
> Use a better AA battery (3.7V 4.9AH Li-ion):
> http://www.ebay.com/itm/181411959514
>
>

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Re: [Elecraft] My KX3 Battery Approach

2014-07-14 Thread John Payne 

Unfortunately, those are NOT AA size cells.  18650 cells are much larger.

See 

73 de W4CWZ

On 7/13/2014 5:58 PM, kb9...@wi.rr.com wrote:

Use a better AA battery (3.7V 4.9AH Li-ion):
http://www.ebay.com/itm/181411959514




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Re: [Elecraft] My KX3 Battery Approach

2014-07-13 Thread KB9WMJ 
The 4.2V is the maximum open circuit voltage.  If you are that worried about 
it only use 3  Li-ion batteries.

Adding a couple of 5A diodes in series is a viable option as well, plus it 
adds the reverse voltage protection.

Keith
KB9WMJ


- Original Message - 
From: "Chip Stratton" 
Cc: 
Sent: Sunday, July 13, 2014 6:10 PM
Subject: Re: [Elecraft] My KX3 Battery Approach


The 3.7V rating is its voltage at about 50% state of charge. That type of
Li-ion cell has a fully charged voltage of 4.2V.  Four of them would be too
much for a KX3.

Chip
Ae5ka

On Sunday, July 13, 2014,  wrote:

> Use a better AA battery (3.7V 4.9AH Li-ion):
> http://www.ebay.com/itm/181411959514
>
> and battery holder:
> http://www.utmfg.com/category/BAT-AA.html
>
> Use 4 of them for 14.8V.
>
> Keith
> KB9WMJ
>
>
> - Original Message -
> From: "hb9brj" >
> To: >
> Sent: Saturday, July 12, 2014 12:30 PM
> Subject: Re: [Elecraft] My KX3 Battery Approach
>
>
> Using 8 internal eneloop cells, I measured battery voltage versus current
> (as
> shown on the KX3 display) during RX and different TX pwr levels, created 
> an
> Excel scatter chart and fitted a linear trend line. The result: 1.15 Ohms,
> R^2 = 0.95.
>
> A single eneloop cell has around 0.035 Ohms of internal resistance
> (measured
> with a 4-connector battery DC resistance meter forcing current pulses thru
> the cell under test).
>
> My conclusion: 25% of the 1.15 Ohms are due to the 8 cells, 75% originate
> in
> the battery holder and additional wiring.
>
> Markus HB9BRJ
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Re: [Elecraft] My KX3 Battery Approach

2014-07-13 Thread Chip Stratton 
The 3.7V rating is its voltage at about 50% state of charge. That type of
Li-ion cell has a fully charged voltage of 4.2V.  Four of them would be too
much for a KX3.

Chip
Ae5ka

On Sunday, July 13, 2014,  wrote:

> Use a better AA battery (3.7V 4.9AH Li-ion):
> http://www.ebay.com/itm/181411959514
>
> and battery holder:
> http://www.utmfg.com/category/BAT-AA.html
>
> Use 4 of them for 14.8V.
>
> Keith
> KB9WMJ
>
>
> - Original Message -
> From: "hb9brj" >
> To: >
> Sent: Saturday, July 12, 2014 12:30 PM
> Subject: Re: [Elecraft] My KX3 Battery Approach
>
>
> Using 8 internal eneloop cells, I measured battery voltage versus current
> (as
> shown on the KX3 display) during RX and different TX pwr levels, created an
> Excel scatter chart and fitted a linear trend line. The result: 1.15 Ohms,
> R^2 = 0.95.
>
> A single eneloop cell has around 0.035 Ohms of internal resistance
> (measured
> with a 4-connector battery DC resistance meter forcing current pulses thru
> the cell under test).
>
> My conclusion: 25% of the 1.15 Ohms are due to the 8 cells, 75% originate
> in
> the battery holder and additional wiring.
>
> Markus HB9BRJ
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net 
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to lightdazz...@gmail.com 
>
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Re: [Elecraft] My KX3 Battery Approach

2014-07-13 Thread KB9WMJ 
Use a better AA battery (3.7V 4.9AH Li-ion):
http://www.ebay.com/itm/181411959514

and battery holder:
http://www.utmfg.com/category/BAT-AA.html

Use 4 of them for 14.8V.

Keith
KB9WMJ


- Original Message - 
From: "hb9brj" 
To: 
Sent: Saturday, July 12, 2014 12:30 PM
Subject: Re: [Elecraft] My KX3 Battery Approach


Using 8 internal eneloop cells, I measured battery voltage versus current 
(as
shown on the KX3 display) during RX and different TX pwr levels, created an
Excel scatter chart and fitted a linear trend line. The result: 1.15 Ohms,
R^2 = 0.95.

A single eneloop cell has around 0.035 Ohms of internal resistance (measured
with a 4-connector battery DC resistance meter forcing current pulses thru
the cell under test).

My conclusion: 25% of the 1.15 Ohms are due to the 8 cells, 75% originate in
the battery holder and additional wiring.

Markus HB9BRJ

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Re: [Elecraft] My KX3 Battery Approach

2014-07-12 Thread hb9brj 
Using 8 internal eneloop cells, I measured battery voltage versus current (as
shown on the KX3 display) during RX and different TX pwr levels, created an
Excel scatter chart and fitted a linear trend line. The result: 1.15 Ohms,
R^2 = 0.95.

A single eneloop cell has around 0.035 Ohms of internal resistance (measured
with a 4-connector battery DC resistance meter forcing current pulses thru
the cell under test).

My conclusion: 25% of the 1.15 Ohms are due to the 8 cells, 75% originate in
the battery holder and additional wiring.

Markus HB9BRJ



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/My-KX3-Battery-Approach-tp7591100p7591119.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] My KX3 Battery Approach

2014-07-12 Thread Chip Stratton 
The problem I have found with AA cell holders of the 10 cell variety is
that there was unacceptable voltage drop under load. I tried this with the
KX1 and was not satisfied. I think it will take a pretty high quality cell
holder to get around that problem, which resides around the contacts and
interconnects.

Good Luck!
Chip
Ae5ka
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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread ejkkjh 

Mouser has them, the 10 cell.
Emory WM3M

-Original Message- 
From: Doug Person via Elecraft

Sent: Friday, July 11, 2014 9:01 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] My KX3 Battery Approach

You can find the 10-cell on ebay.  It does come from China and takes a
few weeks.  But they're cheap.
72, Doug -- K0DXV

On 7/11/2014 6:11 PM, Phil Wheeler wrote:
I looked there. it appears to hold 8 cells, not ten. Plus ships from Hong 
Kong, so a bit of a wait :-)


The 10-cell holders seem a bit hard to find. In fact, I'd looked and not 
found one -- so I was quite surprised to see one in my local store and 
grabbed it.  My old standby is a 10 AA holder which came with an old Icom 
02-AT!


Phil W7OX

On 7/11/14, 4:20 PM, Jeff Herr wrote:

look at this, free shipping!
http://www.amazon.com/SODIAL-TM-Cells-Battery-Holder/dp/B00DFQRTT6/ref=sr_1_
5?s=electronics&ie=UTF8&qid=1405120731&sr=1-5&keywords=10+cell+battery+holde
r

it is a good idea

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
Phil

Wheeler
Sent: Friday, July 11, 2014 14:49 PM
To: David Cutter; k...@yahoogroups.com; Elecraft Reflector
Subject: Re: [Elecraft] My KX3 Battery Approach

Right! The flexibility is good, and I have quite a few Eneloops on hand.

Yes, $10 is a bit pricy, David. Those are not exactly what I bought; I 
just
searched Amazon for a link with an image; bought mine in a local store. 
The

8-cell version is more common, but ten is a better choice for our rigs!

73, Phil W7OX

On 7/11/14, 2:39 PM, David Cutter wrote:

..and you can buy AA cells anywhere in the world.  I run my KX1 that
way.

BTW that's a very expensive battery holder.  I bought a couple of
these in the UK - not normally known for cheaper prices:
http://www.maplin.co.uk/p/10-aa-battery-box-rk45y

73

David
G3UNA

- Original Message - From: "Phil Wheeler" 
To: ; "Elecraft Reflector"

Sent: Friday, July 11, 2014 9:04 PM
Subject: [Elecraft] My KX3 Battery Approach



While I have a 5 Amp-hr Lithium Ion battery and use it, and also
high-capacity Eneloops inside my KX3 (with the battery charger
option) my preferred approach is to use ten external Eneloops in a
battery holder made to hold ten AA cells, this sort of thing:

http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07
_s00?ie=UTF8&psc=1


That way I have no power limitations, it's easy to recharge the
batteries (I have two Maha chargers, one 4 cell and one 8 cell, so I
always have the ten needed spares available).
Works good with a number of rigs (K1, KX1, etc.)

While the capacity is only 2 A-h or so (vs. 5 or higher with some of
the newer, more exotic batteries out there) this works for me -- and
the cells can be used for other things like a camera flash gun. And
easy to change out the cells to fresh ones.

Phil W7OX



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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread Doug Person via Elecraft 
You can find the 10-cell on ebay.  It does come from China and takes a 
few weeks.  But they're cheap.

72, Doug -- K0DXV

On 7/11/2014 6:11 PM, Phil Wheeler wrote:
I looked there. it appears to hold 8 cells, not ten. Plus ships from 
Hong Kong, so a bit of a wait :-)


The 10-cell holders seem a bit hard to find. In fact, I'd looked and 
not found one -- so I was quite surprised to see one in my local store 
and grabbed it.  My old standby is a 10 AA holder which came with an 
old Icom 02-AT!


Phil W7OX

On 7/11/14, 4:20 PM, Jeff Herr wrote:

look at this, free shipping!
http://www.amazon.com/SODIAL-TM-Cells-Battery-Holder/dp/B00DFQRTT6/ref=sr_1_ 

5?s=electronics&ie=UTF8&qid=1405120731&sr=1-5&keywords=10+cell+battery+holde 


r

it is a good idea

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
Phil

Wheeler
Sent: Friday, July 11, 2014 14:49 PM
To: David Cutter; k...@yahoogroups.com; Elecraft Reflector
Subject: Re: [Elecraft] My KX3 Battery Approach

Right! The flexibility is good, and I have quite a few Eneloops on hand.

Yes, $10 is a bit pricy, David. Those are not exactly what I bought; 
I just
searched Amazon for a link with an image; bought mine in a local 
store.  The

8-cell version is more common, but ten is a better choice for our rigs!

73, Phil W7OX

On 7/11/14, 2:39 PM, David Cutter wrote:

..and you can buy AA cells anywhere in the world.  I run my KX1 that
way.

BTW that's a very expensive battery holder.  I bought a couple of
these in the UK - not normally known for cheaper prices:
http://www.maplin.co.uk/p/10-aa-battery-box-rk45y

73

David
G3UNA

- Original Message - From: "Phil Wheeler" 
To: ; "Elecraft Reflector"

Sent: Friday, July 11, 2014 9:04 PM
Subject: [Elecraft] My KX3 Battery Approach



While I have a 5 Amp-hr Lithium Ion battery and use it, and also
high-capacity Eneloops inside my KX3 (with the battery charger
option) my preferred approach is to use ten external Eneloops in a
battery holder made to hold ten AA cells, this sort of thing:

http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07
_s00?ie=UTF8&psc=1


That way I have no power limitations, it's easy to recharge the
batteries (I have two Maha chargers, one 4 cell and one 8 cell, so I
always have the ten needed spares available).
Works good with a number of rigs (K1, KX1, etc.)

While the capacity is only 2 A-h or so (vs. 5 or higher with some of
the newer, more exotic batteries out there) this works for me -- and
the cells can be used for other things like a camera flash gun. And
easy to change out the cells to fresh ones.

Phil W7OX



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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread Phil Wheeler 
I looked there. it appears to hold 8 cells, not 
ten. Plus ships from Hong Kong, so a bit of a wait 
:-)


The 10-cell holders seem a bit hard to find. In 
fact, I'd looked and not found one -- so I was 
quite surprised to see one in my local store and 
grabbed it.  My old standby is a 10 AA holder 
which came with an old Icom 02-AT!


Phil W7OX

On 7/11/14, 4:20 PM, Jeff Herr wrote:

look at this, free shipping!
http://www.amazon.com/SODIAL-TM-Cells-Battery-Holder/dp/B00DFQRTT6/ref=sr_1_
5?s=electronics&ie=UTF8&qid=1405120731&sr=1-5&keywords=10+cell+battery+holde
r

it is a good idea

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil
Wheeler
Sent: Friday, July 11, 2014 14:49 PM
To: David Cutter; k...@yahoogroups.com; Elecraft Reflector
Subject: Re: [Elecraft] My KX3 Battery Approach

Right! The flexibility is good, and I have quite a few Eneloops on hand.

Yes, $10 is a bit pricy, David. Those are not exactly what I bought; I just
searched Amazon for a link with an image; bought mine in a local store.  The
8-cell version is more common, but ten is a better choice for our rigs!

73, Phil W7OX

On 7/11/14, 2:39 PM, David Cutter wrote:

..and you can buy AA cells anywhere in the world.  I run my KX1 that
way.

BTW that's a very expensive battery holder.  I bought a couple of
these in the UK - not normally known for cheaper prices:
http://www.maplin.co.uk/p/10-aa-battery-box-rk45y

73

David
G3UNA

- Original Message - From: "Phil Wheeler" 
To: ; "Elecraft Reflector"

Sent: Friday, July 11, 2014 9:04 PM
Subject: [Elecraft] My KX3 Battery Approach



While I have a 5 Amp-hr Lithium Ion battery and use it, and also
high-capacity Eneloops inside my KX3 (with the battery charger
option) my preferred approach is to use ten external Eneloops in a
battery holder made to hold ten AA cells, this sort of thing:

http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07
_s00?ie=UTF8&psc=1


That way I have no power limitations, it's easy to recharge the
batteries (I have two Maha chargers, one 4 cell and one 8 cell, so I
always have the ten needed spares available).
Works good with a number of rigs (K1, KX1, etc.)

While the capacity is only 2 A-h or so (vs. 5 or higher with some of
the newer, more exotic batteries out there) this works for me -- and
the cells can be used for other things like a camera flash gun. And
easy to change out the cells to fresh ones.

Phil W7OX



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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread Jeff Herr 
look at this, free shipping!
http://www.amazon.com/SODIAL-TM-Cells-Battery-Holder/dp/B00DFQRTT6/ref=sr_1_
5?s=electronics&ie=UTF8&qid=1405120731&sr=1-5&keywords=10+cell+battery+holde
r

it is a good idea

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil
Wheeler
Sent: Friday, July 11, 2014 14:49 PM
To: David Cutter; k...@yahoogroups.com; Elecraft Reflector
Subject: Re: [Elecraft] My KX3 Battery Approach

Right! The flexibility is good, and I have quite a few Eneloops on hand.

Yes, $10 is a bit pricy, David. Those are not exactly what I bought; I just
searched Amazon for a link with an image; bought mine in a local store.  The
8-cell version is more common, but ten is a better choice for our rigs!

73, Phil W7OX

On 7/11/14, 2:39 PM, David Cutter wrote:
> ..and you can buy AA cells anywhere in the world.  I run my KX1 that 
> way.
>
> BTW that's a very expensive battery holder.  I bought a couple of 
> these in the UK - not normally known for cheaper prices:
> http://www.maplin.co.uk/p/10-aa-battery-box-rk45y
>
> 73
>
> David
> G3UNA
>
> - Original Message - From: "Phil Wheeler" 
> To: ; "Elecraft Reflector" 
> 
> Sent: Friday, July 11, 2014 9:04 PM
> Subject: [Elecraft] My KX3 Battery Approach
>
>
>> While I have a 5 Amp-hr Lithium Ion battery and use it, and also 
>> high-capacity Eneloops inside my KX3 (with the battery charger 
>> option) my preferred approach is to use ten external Eneloops in a 
>> battery holder made to hold ten AA cells, this sort of thing:
>>
>> http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07
>> _s00?ie=UTF8&psc=1
>>
>>
>> That way I have no power limitations, it's easy to recharge the 
>> batteries (I have two Maha chargers, one 4 cell and one 8 cell, so I 
>> always have the ten needed spares available).
>> Works good with a number of rigs (K1, KX1, etc.)
>>
>> While the capacity is only 2 A-h or so (vs. 5 or higher with some of 
>> the newer, more exotic batteries out there) this works for me -- and 
>> the cells can be used for other things like a camera flash gun. And 
>> easy to change out the cells to fresh ones.
>>
>> Phil W7OX
>
>

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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread Phil Wheeler 
Right! The flexibility is good, and I have quite a 
few Eneloops on hand.


Yes, $10 is a bit pricy, David. Those are not 
exactly what I bought; I just searched Amazon for 
a link with an image; bought mine in a local 
store.  The 8-cell version is more common, but ten 
is a better choice for our rigs!


73, Phil W7OX

On 7/11/14, 2:39 PM, David Cutter wrote:
..and you can buy AA cells anywhere in the 
world.  I run my KX1 that way.


BTW that's a very expensive battery holder.  I 
bought a couple of these in the UK - not 
normally known for cheaper prices: 
http://www.maplin.co.uk/p/10-aa-battery-box-rk45y


73

David
G3UNA

- Original Message - From: "Phil 
Wheeler" 
To: ; "Elecraft Reflector" 


Sent: Friday, July 11, 2014 9:04 PM
Subject: [Elecraft] My KX3 Battery Approach


While I have a 5 Amp-hr Lithium Ion battery and 
use it, and also high-capacity Eneloops inside 
my KX3 (with the battery charger option) my 
preferred approach is to use ten external 
Eneloops in a battery holder made to hold ten 
AA cells, this sort of thing:


http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1 



That way I have no power limitations, it's easy 
to recharge the batteries (I have two Maha 
chargers, one 4 cell and one 8 cell, so I 
always have the ten needed spares available). 
Works good with a number of rigs (K1, KX1, etc.)


While the capacity is only 2 A-h or so (vs. 5 
or higher with some of the newer, more exotic 
batteries out there) this works for me -- and 
the cells can be used for other things like a 
camera flash gun. And easy to change out the 
cells to fresh ones.


Phil W7OX 





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Re: [Elecraft] My KX3 Battery Approach

2014-07-11 Thread David Cutter 

..and you can buy AA cells anywhere in the world.  I run my KX1 that way.

BTW that's a very expensive battery holder.  I bought a couple of these in 
the UK - not normally known for cheaper prices: 
http://www.maplin.co.uk/p/10-aa-battery-box-rk45y


73

David
G3UNA

- Original Message - 
From: "Phil Wheeler" 

To: ; "Elecraft Reflector" 
Sent: Friday, July 11, 2014 9:04 PM
Subject: [Elecraft] My KX3 Battery Approach


While I have a 5 Amp-hr Lithium Ion battery and use it, and also 
high-capacity Eneloops inside my KX3 (with the battery charger option) my 
preferred approach is to use ten external Eneloops in a battery holder 
made to hold ten AA cells, this sort of thing:


http://www.amazon.com/gp/product/B00AZTUI7Q/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1

That way I have no power limitations, it's easy to recharge the batteries 
(I have two Maha chargers, one 4 cell and one 8 cell, so I always have the 
ten needed spares available). Works good with a number of rigs (K1, KX1, 
etc.)


While the capacity is only 2 A-h or so (vs. 5 or higher with some of the 
newer, more exotic batteries out there) this works for me -- and the cells 
can be used for other things like a camera flash gun. And easy to change 
out the cells to fresh ones.


Phil W7OX 


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