Re: [Elecraft] Performance of the KX2 batt

[John Oppenheimer]

Using the DISP voltage, using internal battery, receive is 11.7V and 10W
in TUNE is 10.8V. a drop of 0.9V. The receive drop is a tenth or two, or
round down to a 1V total voltage drop during 10W transmit. The minimum
battery voltage would then be 11V or 3.67V per cell. Looking at
representative discharge curves, 3.67V, is consistent with a 50% discharge.

John KN5L

On 10/16/2016 08:01 AM, Chip Stratton wrote:
> The unloaded voltage of your pack, and the number of amp-hours used are
> consistent with each other, you are about half-way through the usable
> amp-hours of the battery, which has a 2.3 amp-hour rated capacity. Not sure
> exactly what to expect about the voltage drop under load, but I am not
> surprised by it, it would suggest the battery supply has about a 350
> milliohm resistance which again is not surprising.
> 
> I think all is normal with your battery and rig. I'm sure someone else on
> the list with confirm or deny me!
> 
> They could have used Panasonic 3.2 amp-hour 18650 cells in the battery pack
> with no increase in size for longer operating time, but maybe it was a
> weight isssue?
> 
> Chip
> AE5KA
> 
> On Sun, Oct 16, 2016 at 8:31 AM, Howard Sherer  wrote:
> 
>> I have been running my KX2 with the Elecraft supplied batt pack for the
>> past two weeks and have a question for others using the same. I can run the
>> KX2 at 10W only till I have used 1.12 AH of the batt capacity and its key
>> up V=11.0 and key down is 10.3. At this time I can only run the KX2 at 5W.
>>
>> I was expecting that I would be able to run the KX2 at 10W for a longer
>> period. I have repeated this through 4 recharge cycles and the results ar
>> the same. Is my batt pack showing reduced performance?
>>
>> Overall I am very pleased with the performance of the KX2
>>
>> Howard AE3T
>> __
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>> Message delivered to lightdazz...@gmail.com
>>
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Re: [Elecraft] Performance of the KX2 batt

[Bill Frantz]

The Lithium family of battery chemistries all drop in voltage as 
battery capacity is used. At lower voltages, the KX2 IMD goes 
up, so the firmware reduces power output to maintain a clean signal.


The choices seem to be:

  Keep going with 5W and enjoy QRP.
  Pack up the radio, go home, and enjoy a beverage of your choice.
  Use an external battery pack.

Other chemistries, like NiCd and NiMH, tend to hold their output 
voltage longer into the discharge cycle. They might be a better, 
although heavier, choice for an external battery pack.


73 Bill AE6JV

On 10/16/16 at 5:31 AM, h...@lehigh.edu (Howard Sherer) wrote:


I have been running my KX2 with the Elecraft supplied batt pack for the
past two weeks and have a question for others using the same. I can run the
KX2 at 10W only till I have used 1.12 AH of the batt capacity and its key
up V=11.0 and key down is 10.3. At this time I can only run the KX2 at 5W.

-
Bill Frantz| Airline peanut bag: "Produced  | Periwinkle
(408)356-8506  | in a facility that processes   | 16345 
Englewood Ave
www.pwpconsult.com | peanuts and other nuts." - Duh | Los Gatos, 
CA 95032


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Re: [Elecraft] Performance of the KX2 batt

[Doug Turnbull]

Dear OMs and YLs,
 I am not taking issue with what Howard is saying.   My operations are
different!The reason for entering this discussion is that the battery is
being mentioned which I am more than pleased with for CW at 5 Watts.  I have
some observations and a question to finish with.

 First the battery pack appears to weigh approximately half that of the
KX3 battery pack and is physically half size.I am most pleased at the
rapid charging time of about three hours versus up to sixteen hours for the
KX3 battery pack. From now on I will take the charger with me on trips - it
works from a wide range of line voltages. Different computer line power
cords for the UK, Europe and USA are easily obtained.  One battery pack
should do.   You can not run the KX2 from the Charger!!!   The charger is
light and small with the line cord being an unfortunate necessity.  

 Owning both a KX3 and KX2 my intent is in future to only use the KX2
battery pack with either radio.   Travelling by plane with KX3 may be a
problem in that the battery pack should be inside the radio.   The KX3 will
not be flying besides the KX2 is half the volume and weight.   Normally the
battery pack is kept external to the radio.

 Now this is not a comparison of like loads but I find that the KX2
battery pack will last nearly two pages of CW QSOs.  The life span of
batteries with the KX2 beats the life span of batteries with KX3 - this is
not a numerical judgement but one observed through operation.

 Does anyone in the UK or the greater EU have a source of the KX2 type
battery pack in Europe other than those sold by a UK official supplier?   I
want to continue using the KX2 charger.   Adding a connector is no problem.

Another KX2 KX3 topic:

 I find the KX2 an amazing wee radio.   My KX1 has gone to a new home
where it will be used on the trail.   I miss 160M and would probably like 6M
but to be honest TB is not used while travelling and the magic band QSO
style I find boring in Europe - no one rag chews.

 Hopefully Bob Sherwood will do a review of receiver performance.   The
KX2 can not(?) match the KX3 but it is everything I require for portable
operations.   Maybe the KX2 underperforms the KX3 for QRP contesting or for
a DXpedition with large pileups.   It would be nice to know the RX figures.

It was love at first sight when the KX2 viewed at Friedrichshafen.
This is a fun radio for someone interested in portable and especially tail
work.   Alas it is portable operations here.


  73 Doug EI2CN   KX2 SN 1000  Yes this is correct

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Howard
Sherer
Sent: 16 October 2016 12:31
To: elecraft
Subject: [Elecraft] Performance of the KX2 batt

I have been running my KX2 with the Elecraft supplied batt pack for the
past two weeks and have a question for others using the same. I can run the
KX2 at 10W only till I have used 1.12 AH of the batt capacity and its key
up V=11.0 and key down is 10.3. At this time I can only run the KX2 at 5W.

I was expecting that I would be able to run the KX2 at 10W for a longer
period. I have repeated this through 4 recharge cycles and the results ar
the same. Is my batt pack showing reduced performance?

Overall I am very pleased with the performance of the KX2

Howard AE3T
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Re: [Elecraft] Performance of the KX2 batt

[Chip Stratton]

The unloaded voltage of your pack, and the number of amp-hours used are
consistent with each other, you are about half-way through the usable
amp-hours of the battery, which has a 2.3 amp-hour rated capacity. Not sure
exactly what to expect about the voltage drop under load, but I am not
surprised by it, it would suggest the battery supply has about a 350
milliohm resistance which again is not surprising.

I think all is normal with your battery and rig. I'm sure someone else on
the list with confirm or deny me!

They could have used Panasonic 3.2 amp-hour 18650 cells in the battery pack
with no increase in size for longer operating time, but maybe it was a
weight isssue?

Chip
AE5KA

On Sun, Oct 16, 2016 at 8:31 AM, Howard Sherer  wrote:

> I have been running my KX2 with the Elecraft supplied batt pack for the
> past two weeks and have a question for others using the same. I can run the
> KX2 at 10W only till I have used 1.12 AH of the batt capacity and its key
> up V=11.0 and key down is 10.3. At this time I can only run the KX2 at 5W.
>
> I was expecting that I would be able to run the KX2 at 10W for a longer
> period. I have repeated this through 4 recharge cycles and the results ar
> the same. Is my batt pack showing reduced performance?
>
> Overall I am very pleased with the performance of the KX2
>
> Howard AE3T
> __
> 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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