WTB: MP-1 Antenna and portable case

[Mark - W5EZY]

I am looking for a good used MP-1 Super Antenna for a
reasonable price.  I am putting together a
rapid-deployment station for disaster relief
situations.  I also need a carrying case that measures
about 18"x12"x6", or something close to that.  Can
anybody help?

73,
Mark Baugh
W5EZY
Grenada MS

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[DW Harms]

Hi all,

Some days ago I posted a message regarding the charging of NiMh battery's. I
got only one reaction, so I guess many are wondering what is a good way! I
decided to go for the experimental way and did the following:
- Measure the supply voltage, we call that U1;
- Measure the battery voltage in charged situation, we call that U2;
- Take U1-U2 and devide that over the charging current you want to use. In
case of my 2400 mA/h cells I decided for a "conservative" 200 mA;
- The result is the resistor value, in my case about 33 Ohm;
- Take the square of U1-U2 and devide over R and you have the power, in my
case  between one and 2W.
I had a 33 Ohm resistor of 5W in stock which was only 0,3 inch, so it fits
very nicely. I have mounted it on the component side of the pcb, otherwise
it gets in the way of the battery!

The result is very positive, it charges nicely. I have mounted a timer in
line with the charging supply, an old Nokia 12V GSM supply, to avoid
overcharging as I read that NiMh cells dont like that.

Have fun! Oh and by the way; modifying is at your own risk and will probably
violate the warranty. Or perhaps Wayne and Eric find it such a good idea
that they will allow it ;)

73, Dick PA2DW

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[Chuck Gehring]

I for one would at least like to hear if someone see any remote problem with this type of mod?

KI4DGH
Chuck

>
> From: "Dick Harms PA2DW" <[hidden email]>
> Date: 2005/04/22 Fri PM 01:49:12 CDT
> To: "'Elecraft Reflector'" <[hidden email]>
> Subject: [Elecraft] KX1 battery
>
> Hi all,
>
> Some days ago I posted a message regarding the charging of NiMh battery's. I
> got only one reaction, so I guess many are wondering what is a good way! I
> decided to go for the experimental way and did the following:
> - Measure the supply voltage, we call that U1;
> - Measure the battery voltage in charged situation, we call that U2;
> - Take U1-U2 and devide that over the charging current you want to use. In
> case of my 2400 mA/h cells I decided for a "conservative" 200 mA;
> - The result is the resistor value, in my case about 33 Ohm;
> - Take the square of U1-U2 and devide over R and you have the power, in my
> case  between one and 2W.
> I had a 33 Ohm resistor of 5W in stock which was only 0,3 inch, so it fits
> very nicely. I have mounted it on the component side of the pcb, otherwise
> it gets in the way of the battery!
>
> The result is very positive, it charges nicely. I have mounted a timer in
> line with the charging supply, an old Nokia 12V GSM supply, to avoid
> overcharging as I read that NiMh cells dont like that.
>
> Have fun! Oh and by the way; modifying is at your own risk and will probably
> violate the warranty. Or perhaps Wayne and Eric find it such a good idea
> that they will allow it ;)
>
> 73, Dick PA2DW
>
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> Elecraft web page: http://www.elecraft.com
>

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[G3VVT]

 
In a message dated 22/04/05 19:50:27 GMT Daylight Time, [hidden email]  
writes:

I had a  33 Ohm resistor of 5W in stock which was only 0,3 inch, so it fits
very  nicely. I have mounted it on the component side of the pcb, otherwise
it  gets in the way of the battery!

The result is very positive, it charges  nicely. I have mounted a timer in
line with the charging supply, an old  Nokia 12V GSM supply, to avoid
overcharging as I read that NiMh cells dont  like that.



Reply: -----------------------------------------------
 
Hi Dick,
 
Yes, that method will work and is used in most simple hand held radio  
battery chargers to limit the charge current.
 
However to get the best life out of NiCad and NiMh cells/batteries I have  
always understood that they should be charged under constant current conditions  
at the recommended rate given with the cells or battery. The series resistor  
method does limit the maximum current though may partially fall down on not  
providing a constant current. There are several methods of providing a
constant  current, the most common being to use a voltage regulator with a series
resistor  providing feedback. I use an earlier method with two transistors and
two  resistors that is easily adapted to any required constant current and will
cope  with a wide range of input voltages.
 
Not sure how the charging of the KX1 is configured so your options may be  
limited. Contact me off the list if you need the two transistor schematic.
 
Gross Overcharging of *any* rechargeable cell/battery is always a problem  
resulting in heat generation and eventual destruction of the cells unless this  
is limited to a charge rate of 2.5% or less of battery capacity. I  had
something like 400 UHF HH to maintain at an oil terminal/gas plant  and apart from
the operators using the radios instead of a hammer, the main  problem was gross
overcharging which could lead to failure of the battery  in as little time as
a year. Some automatic chargers received more recently were  the answer to
this problem, though these are even today far from being  widely available. Time
limiting the charge will work as long as the battery is  fully discharged to
start with. A partly discharged battery subjected to a full  charge cycle will
only dissipate the resultant continuation of charge after full  charge is
reached as heat. Note that all modern cellular mobile telephones are  fitted with
an automatic charger to get maximum recharging life from the  battery.
 
Bob, G3VVT
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[johnny-52]

Hi Group,

This flag ship desktop microphone from Yaesu only sells USD255 in Hong Kong.
I would be grateful if any of you could advise how good will it be if this
mic is used with K2.

Thank you in advance.

73

Johnny Siu VR2XMC
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