Re: [Elecraft] KX3 power supply

[Howard Hoyt]

Jeff,

Pro Audio Engineering also has good stock of these cores and better 
pricing than Mouser.


Howie - WA4PSC


I bought the cores from Verical.com --

they had the best deal on them --
but they appear to be out of stock.



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Re: [Elecraft] KX3 power supply

[Thorpe, Jeffrey]

I did that for a folding solar panel I purchased that put out 18V. A couple 
zeners dropped it to 15.3V. The panel doesn't have the juice for transmission, 
but fine for receive (or charging the batteries).

Jeff - kg7hdz

> On Jan 18, 2016, at 16:21, Don Wilhelm  wrote:
> 
> John,
> 
> I would suggest that you put a diode in series with that supply - rated at 5 
> amps.  That will reduce the voltage by the amount of the diode drop.
> Running the KX3 (or any other device) above the specified maximum voltage is 
> done at your own peril - it may work, but it taxes the regulators and other 
> devices.
> 
> 73,
> Don W3FPR
> 
>> 
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Re: [Elecraft] KX3 power supply

[Jim Brown]

There are other good solutions. Use the panels and charge controller to 
charge an outboard battery.  Now you DO have enough for TX.


Genasun is the best, no RF noise, very efficient.  They make different 
products that are designed for each type of battery chemistry, and for 
different power ratings. I use the GV-10 in my station.


http://genasun.com/products-store/mppt-solar-charge-controllers/

This SunForce is less efficient, no RF noise, but very inexpensive.  $17 
at amazon. Designed for lead-acid.  I used this unit in my station until 
I found the GV-10.


http://www.sunforceproducts.com/product_details.php?PRODUCT_ID=56

73, Jim K9YC

On Tue,1/19/2016 12:23 PM, Thorpe, Jeffrey wrote:

I did that for a folding solar panel I purchased that put out 18V. A couple 
zeners dropped it to 15.3V. The panel doesn't have the juice for transmission, 
but fine for receive (or charging the batteries).

Jeff - kg7hdz


On Jan 18, 2016, at 16:21, Don Wilhelm  wrote:

John,

I would suggest that you put a diode in series with that supply - rated at 5 
amps.  That will reduce the voltage by the amount of the diode drop.
Running the KX3 (or any other device) above the specified maximum voltage is 
done at your own peril - it may work, but it taxes the regulators and other 
devices.

73,
Don W3FPR


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Re: [Elecraft] KX3 power supply

[Thorpe, Jeffrey]

I have a LiFePo from Bienno and the Buddipole charge controller for portable 
ops. Very tiny. System works well.

Jeff - kg7hdz

> On Jan 19, 2016, at 1:50 PM, Jim Brown  wrote:
> 
> There are other good solutions. Use the panels and charge controller to 
> charge an outboard battery.  Now you DO have enough for TX.
> 
> Genasun is the best, no RF noise, very efficient.  They make different 
> products that are designed for each type of battery chemistry, and for 
> different power ratings. I use the GV-10 in my station.
> 
> http://genasun.com/products-store/mppt-solar-charge-controllers/
> 
> This SunForce is less efficient, no RF noise, but very inexpensive.  $17 at 
> amazon. Designed for lead-acid.  I used this unit in my station until I found 
> the GV-10.
> 
> http://www.sunforceproducts.com/product_details.php?PRODUCT_ID=56
> 
> 73, Jim K9YC
> 
>> On Tue,1/19/2016 12:23 PM, Thorpe, Jeffrey wrote:
>> I did that for a folding solar panel I purchased that put out 18V. A couple 
>> zeners dropped it to 15.3V. The panel doesn't have the juice for 
>> transmission, but fine for receive (or charging the batteries).
>> 
>> Jeff - kg7hdz
>> 
>>> On Jan 18, 2016, at 16:21, Don Wilhelm  wrote:
>>> 
>>> John,
>>> 
>>> I would suggest that you put a diode in series with that supply - rated at 
>>> 5 amps.  That will reduce the voltage by the amount of the diode drop.
>>> Running the KX3 (or any other device) above the specified maximum voltage 
>>> is done at your own peril - it may work, but it taxes the regulators and 
>>> other devices.
>>> 
>>> 73,
>>> Don W3FPR
>> __
> 
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Re: [Elecraft] KX3 power supply

[Jim Bolit]

Arrow Electronics (disty) has the lowest price

The picture they have for the part number below is wrong.  The p/n is for
the big clamp 31 material




31 material big clamp on
 
·FAIR-RITE 0431177081

http://components.arrow.com/part/detail/48300806S8316702N4455



Jim
W6AIM







-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Jeffrey Otterson
Sent: Tuesday, January 19, 2016 6:39 AM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KX3 power supply

Hello Chip,

I did a lot of testing of KX3 power supplies, and the PAE is the quietest,
next to a linear power supply.

I had a fair amount of EMI problems, too, until I put a big ferrite bead
(Fair-Rite 0431176451) on the DC output wire.  I wound 6 turns though the
core, right at the power plug that goes into the KX3.  This brought the
noise down to barely audible, totally tolerable.

I bought the cores from Verical.com -- they had the best deal on them -- but
they appear to be out of stock.  Mouser's got them for under $8.  These are
the same cores that K9YC recommends in his "RF Interference to Audio
Systems" paper.

73

Jeff n1kdo

-- Forwarded message --
> From: Chip Stratton <lightdazz...@gmail.com>
> To:
> Cc: Elecraft Reflector <Elecraft@mailman.qth.net>
> Date: Mon, 18 Jan 2016 19:38:50 -0600
> Subject: Re: [Elecraft] KX3 power supply The PAE power supply works 
> fine, but it still puts out enough hash that I can't use my loop 
> antenna near it. It is better than others? Probably, but still not 
> usable for me when near  the receiving antenna.
> Chip
> AE5KA
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[Elecraft] KX3 Power Supply

[Keith D Jones]

I purchased 5V, 12V, & 15V versions of the Solas power supplies made in
Germany.  The SCP30S15DN 15V @ 2A 2 A Amp 100-240V 0.75A are currently
selling on ebay for about $25.  I have not done any extensive testing but
have not noticed any power irregularities or hash.  They seem to be very
well made units made for an industrial setting.  


Keith, N4KDJ


 

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Re: [Elecraft] KX3 power supply

[Jeffrey Otterson]

Hello Chip,

I did a lot of testing of KX3 power supplies, and the PAE is the quietest,
next to a linear power supply.

I had a fair amount of EMI problems, too, until I put a big ferrite bead
(Fair-Rite 0431176451) on the DC output wire.  I wound 6 turns though the
core, right at the power plug that goes into the KX3.  This brought the
noise down to barely audible, totally tolerable.

I bought the cores from Verical.com -- they had the best deal on them --
but they appear to be out of stock.  Mouser's got them for under $8.  These
are the same cores that K9YC recommends in his "RF Interference to Audio
Systems" paper.

73

Jeff n1kdo

-- Forwarded message --
> From: Chip Stratton <lightdazz...@gmail.com>
> To:
> Cc: Elecraft Reflector <Elecraft@mailman.qth.net>
> Date: Mon, 18 Jan 2016 19:38:50 -0600
> Subject: Re: [Elecraft] KX3 power supply
> The PAE power supply works fine, but it still puts out enough hash that I
> can't use my loop antenna near it. It is better than others? Probably, but
> still not usable for me when near  the receiving antenna.
> Chip
> AE5KA
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Re: [Elecraft] KX3 power supply

[Alan Sewell N5NA]

I found my PAE-Kx33 also put out hash I could hear when operating near 
my mag loop.  I put two mix 33 split ferrite cores with 5 turns each on 
the DC cable near the power supply.  That knocked the hash down so it's 
negligible.


73, Alan N5NA

On 1/19/2016 6:10 AM, elecraft-requ...@mailman.qth.net wrote:

Message: 18
Date: Mon, 18 Jan 2016 19:38:50 -0600
From: Chip Stratton<lightdazz...@gmail.com>
Cc: Elecraft Reflector<Elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KX3 power supply
Message-ID:
<capf-ba2-rourfolzrdgonuwu4tzz34n1rbatt5+tbbkl-34...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

The PAE power supply works fine, but it still puts out enough hash that I
can't use my loop antenna near it. It is better than others? Probably, but
still not usable for me when near  the receiving antenna.

Chip
AE5KA


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Re: [Elecraft] KX3 power supply

[John Kramer]

Don

Thanks for the reply. I have thought long about it, and decided I would rather 
not risk damaging
my KX3 for the sake of a cheap PSU. I live too far away from the factory to 
risk damaging
the KX3 - it cost me $ 450.00 just to ship my new KX3 to me in June.

I will leave the cheap eBay PSU for some other project, or the trash. I have 
plenty of other 
regulated, stable PSU’s that supply the correct voltage, so I will continue 
using them.

I would never forgive myself if I damaged my KX3 by using a cheap eBay PSU.

Thanks for all the replies

73
John, ZS5J







On 19 Jan 2016, at 1:18 AM, Don Wilhelm  wrote:

John,

I would suggest that you put a diode in series with that supply - rated
at 5 amps.  That will reduce the voltage by the amount of the diode drop.
Running the KX3 (or any other device) above the specified maximum
voltage is done at your own peril - it may work, but it taxes the
regulators and other devices.

73,
Don W3FPR

On 1/18/2016 3:43 PM, John Kramer wrote:
> Someone on this reflector suggested a power supply off eBay, that could be 
> used
> with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
> bought one,
> this is the one…
> 
> http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
>  
> 
> 
> It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
> amps, and only sells
> for $ 7.79 including free shipping from Hong Kong.
> Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked 
> up to a volt meter
> and see it is 15.4 volts. I know it is better for TX IMD to have higher 
> voltage supplied to the
> KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
> too much
> for the KX3. I see in the KX3 manual specs, that recommended supply voltage 
> is 8 - 15 volts.
> I would hate to hurt my KX3 with over voltage……anyone know if there would be 
> any short
> or long term problems with running 15.4 volts to the KX3 ? It is just 
> slightly above the
> maximum recommended supply voltage
> 
> 73
> John, ZS5J.
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Re: [Elecraft] KX3 power supply

[Don Wilhelm]

John,

I would suggest that you put a diode in series with that supply - rated 
at 5 amps.  That will reduce the voltage by the amount of the diode drop.
Running the KX3 (or any other device) above the specified maximum 
voltage is done at your own peril - it may work, but it taxes the 
regulators and other devices.


73,
Don W3FPR

On 1/18/2016 3:43 PM, John Kramer wrote:

Someone on this reflector suggested a power supply off eBay, that could be used
with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
bought one,
this is the one…

http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
 


It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
amps, and only sells
for $ 7.79 including free shipping from Hong Kong.
Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked up 
to a volt meter
and see it is 15.4 volts. I know it is better for TX IMD to have higher voltage 
supplied to the
KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
too much
for the KX3. I see in the KX3 manual specs, that recommended supply voltage is 
8 - 15 volts.
I would hate to hurt my KX3 with over voltage……anyone know if there would be 
any short
or long term problems with running 15.4 volts to the KX3 ? It is just slightly 
above the
maximum recommended supply voltage

73
John, ZS5J.
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Re: [Elecraft] KX3 power supply

[Matt Murphy]

I bought one of the pro audio engineering KX3 power supplies and it works
perfectly.

73,
Matt NQ6N

On Mon, Jan 18, 2016 at 1:31 PM, Howard Hoyt  wrote:

> John,
>
> I do have a horse in this race (the Kx33), but I will tell you that in
> testing many supplies I have seen that many of them have poor regulation.
> Some show as much as 25% peak over-voltage which you would need a scope to
> see when a load is removed, which is the situation when the KX3 returns to
> receive after a full-power transmit cycle.  Running 15.4V average could
> potentially mean 19.25V peak with such a supply.
>
> This reason plus many others is why we designed the Kx33.  We like our
> KX3s!
>
> Cheers & 73,
>
> Howie - WA4PSC
> www.proaudioeng.com
>
>
> >>I would hate to hurt my KX3 with over voltage??
> >>anyone know if there would be any short or long
> >>term problems with running 15.4 volts to the KX3?
> >>It is just slightly above the maximum recommended
> >> supply voltage
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Re: [Elecraft] KX3 power supply

[Chip Stratton]

The PAE power supply works fine, but it still puts out enough hash that I
can't use my loop antenna near it. It is better than others? Probably, but
still not usable for me when near  the receiving antenna.

Chip
AE5KA

On Mon, Jan 18, 2016 at 5:38 PM, Matt Murphy  wrote:

> I bought one of the pro audio engineering KX3 power supplies and it works
> perfectly.
>
> 73,
> Matt NQ6N
>
> On Mon, Jan 18, 2016 at 1:31 PM, Howard Hoyt  wrote:
>
> > John,
> >
> > I do have a horse in this race (the Kx33), but I will tell you that in
> > testing many supplies I have seen that many of them have poor regulation.
> > Some show as much as 25% peak over-voltage which you would need a scope
> to
> > see when a load is removed, which is the situation when the KX3 returns
> to
> > receive after a full-power transmit cycle.  Running 15.4V average could
> > potentially mean 19.25V peak with such a supply.
> >
> > This reason plus many others is why we designed the Kx33.  We like our
> > KX3s!
> >
> > Cheers & 73,
> >
> > Howie - WA4PSC
> > www.proaudioeng.com
> >
> >
> > >>I would hate to hurt my KX3 with over voltage??
> > >>anyone know if there would be any short or long
> > >>term problems with running 15.4 volts to the KX3?
> > >>It is just slightly above the maximum recommended
> > >> supply voltage
> > __
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> >
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Re: [Elecraft] KX3 power supply

[Ken Talbott]

That plug is NOT correct for the KX3.  It SB 2.1 X 5.5 (rather, that's what I 
use.)
Ken - ke4rg

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John 
Kramer
Sent: Monday, January 18, 2016 3:44 PM
To: Elecraft list <Elecraft@mailman.qth.net>
Subject: [Elecraft] KX3 power supply

Someone on this reflector suggested a power supply off eBay, that could be used 
with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
bought one, this is the one 

http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
 
<http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22>

It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
amps, and only sells for $ 7.79 including free shipping from Hong Kong.
Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked up 
to a volt meter and see it is 15.4 volts. I know it is better for TX IMD to 
have higher voltage supplied to the
KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
too much for the KX3. I see in the KX3 manual specs, that recommended supply 
voltage is 8 - 15 volts.
I would hate to hurt my KX3 with over voltage  anyone know if there would be 
any short or long term problems with running 15.4 volts to the KX3 ? It is just 
slightly above the maximum recommended supply voltage

73
John, ZS5J.
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[Elecraft] KX3 power supply

[John Kramer]

Someone on this reflector suggested a power supply off eBay, that could be used 
with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
bought one, 
this is the one…

http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
 


It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
amps, and only sells 
for $ 7.79 including free shipping from Hong Kong.
Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked up 
to a volt meter
and see it is 15.4 volts. I know it is better for TX IMD to have higher voltage 
supplied to the 
KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
too much
for the KX3. I see in the KX3 manual specs, that recommended supply voltage is 
8 - 15 volts.
I would hate to hurt my KX3 with over voltage……anyone know if there would be 
any short
or long term problems with running 15.4 volts to the KX3 ? It is just slightly 
above the 
maximum recommended supply voltage

73
John, ZS5J.
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[Elecraft] KX3 power supply

[Howard Hoyt]

John,

I do have a horse in this race (the Kx33), but I will tell you that in 
testing many supplies I have seen that many of them have poor 
regulation.  Some show as much as 25% peak over-voltage which you would 
need a scope to see when a load is removed, which is the situation when 
the KX3 returns to receive after a full-power transmit cycle.  Running 
15.4V average could potentially mean 19.25V peak with such a supply.


This reason plus many others is why we designed the Kx33.  We like our KX3s!

Cheers & 73,

Howie - WA4PSC
www.proaudioeng.com


>>I would hate to hurt my KX3 with over voltage??
>>anyone know if there would be any short or long
>>term problems with running 15.4 volts to the KX3?
>>It is just slightly above the maximum recommended
>> supply voltage
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Re: [Elecraft] KX3 power supply

[Bob N3MNT]

The KX3 will shut down if the voltage is too high.



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Re: [Elecraft] KX3 power supply

[John Kramer]

Thanks for the info Bob, and it’s reassuring to see that the KX3 has protection 
for 
over voltage.
One caveat with this PSU - I just tried to insert the DC plug from this  PSU to 
the KX3, 
and I see it is too large for the KX3. Not a big deal, I will just cut it off 
and fit the correct
size DC plug

73

John, ZS5J




On 18 Jan 2016, at 11:09 PM, Bob N3MNT  wrote:

The KX3 will shut down if the voltage is too high.





Someone on this reflector suggested a power supply off eBay, that could be used 
with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
bought one, 
this is the one…

http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
 


It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
amps, and only sells 
for $ 7.79 including free shipping from Hong Kong.
Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked up 
to a volt meter
and see it is 15.4 volts. I know it is better for TX IMD to have higher voltage 
supplied to the 
KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
too much
for the KX3. I see in the KX3 manual specs, that recommended supply voltage is 
8 - 15 volts.
I would hate to hurt my KX3 with over voltage……anyone know if there would be 
any short
or long term problems with running 15.4 volts to the KX3 ? It is just slightly 
above the 
maximum recommended supply voltage

73
John, ZS5J.
__

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Re: [Elecraft] KX3 power supply

[Nr4c]

I'd look to reduce the voltage about half a bolt before I'd use it with a KX3. 

Sent from my iPhone
...nr4c. bill


> On Jan 18, 2016, at 3:43 PM, John Kramer  wrote:
> 
> Someone on this reflector suggested a power supply off eBay, that could be 
> used 
> with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
> bought one, 
> this is the one…
> 
> http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
>  
> 
> 
> It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
> amps, and only sells 
> for $ 7.79 including free shipping from Hong Kong.
> Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked 
> up to a volt meter
> and see it is 15.4 volts. I know it is better for TX IMD to have higher 
> voltage supplied to the 
> KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
> too much
> for the KX3. I see in the KX3 manual specs, that recommended supply voltage 
> is 8 - 15 volts.
> I would hate to hurt my KX3 with over voltage……anyone know if there would be 
> any short
> or long term problems with running 15.4 volts to the KX3 ? It is just 
> slightly above the 
> maximum recommended supply voltage
> 
> 73
> John, ZS5J.
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Re: [Elecraft] KX3 power supply

[Clay Autery]

And you could always put together a little inline circuit to drop the
voltage down to 13.8-14.1 or so...

73,

__
Clay Autery

On 1/18/2016 3:17 PM, John Kramer wrote:
> Thanks for the info Bob, and it’s reassuring to see that the KX3 has 
> protection for 
> over voltage.
> One caveat with this PSU - I just tried to insert the DC plug from this  PSU 
> to the KX3, 
> and I see it is too large for the KX3. Not a big deal, I will just cut it off 
> and fit the correct
> size DC plug
>
> 73
>
> John, ZS5J
>
>
>
>
> On 18 Jan 2016, at 11:09 PM, Bob N3MNT  wrote:
>
> The KX3 will shut down if the voltage is too high.
>
>
>
>
>
> Someone on this reflector suggested a power supply off eBay, that could be 
> used 
> with the KX3 about 2 months ago. It is intended for Toshiba laptops. So I 
> bought one, 
> this is the one…
>
> http://www.ebay.com/itm/15V-5A-AC-Adapter-Charger-Power-Supply-For-Toshiba-Tecra-A6-A7-A8-A9-A10-Laptop-/381356162365?hash=item58ca993d3d:g:Yk0AAOSwMmBVxX22
>  
> 
>
> It terminates in the right plug for the KX3 and is rated at 15 volts at max 5 
> amps, and only sells 
> for $ 7.79 including free shipping from Hong Kong.
> Anyway, it is cheap as chips so I bought one, and it arrived today. I hooked 
> up to a volt meter
> and see it is 15.4 volts. I know it is better for TX IMD to have higher 
> voltage supplied to the 
> KX3 rather than a voltage too low, but I am concerned that 15.4 volts may be 
> too much
> for the KX3. I see in the KX3 manual specs, that recommended supply voltage 
> is 8 - 15 volts.
> I would hate to hurt my KX3 with over voltage……anyone know if there would be 
> any short
> or long term problems with running 15.4 volts to the KX3 ? It is just 
> slightly above the 
> maximum recommended supply voltage
>
> 73
> John, ZS5J.
> __
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/KX3-power-supply-tp7612732p7612736.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] KX3 power supply brick

[David Ahrendts]

I’m not an expert on this, but from what I’ve observed is that some of these DC 
bricks can be very noisy.

 On Feb 10, 2015, at 12:57 PM, Lynn W. Taylor, WB6UUT 
 k...@coldrockshotbrooms.com wrote:
 
 I just looked at four bricks floating around my office, and two of them are 
 12v.  The other two are 18v and 19v.
 
 The smallest one I have is 2a, which would probably charge the internal KX3 
 batteries.  The bigger one might be okay for transmitting.
 
 That's why I specified 12v brick in my post.  There are many different 
 bricks out there.
 
 73 -- Lynn
 
 On 2/10/2015 12:34 PM, Walter Underwood wrote:
 Most laptop bricks are 16V or higher, too much voltage for the KX3.
 
 wunder
 K6WRU
 CM87wj
 http://observer.wunderwood.org/
 
 
 
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David Ahrendts   davidahren...@me.com   




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Re: [Elecraft] KX3 power supply brick

[Fred Townsend]

Lynn:
Probably a bad idea. The so called computer bricks are designed as charge
pumps to drive another power converter. As such they are not necessarily
clean or well regulated.

73, Fred, AE6QL

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lynn
W. Taylor, WB6UUT
Sent: Tuesday, February 10, 2015 12:26 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KX3 power supply brick

Has anyone tried a 12v brick like most laptops use for their KX3?

Comments one way or another??

Thanks -- Lynn
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Re: [Elecraft] KX3 power supply brick

[Lynn W. Taylor, WB6UUT]

I just looked at four bricks floating around my office, and two of them 
are 12v.  The other two are 18v and 19v.


The smallest one I have is 2a, which would probably charge the internal 
KX3 batteries.  The bigger one might be okay for transmitting.


That's why I specified 12v brick in my post.  There are many different 
bricks out there.


73 -- Lynn

On 2/10/2015 12:34 PM, Walter Underwood wrote:

Most laptop bricks are 16V or higher, too much voltage for the KX3.

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/




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Re: [Elecraft] KX3 power supply brick

[Don Wilhelm]

Lynn,

You really should use 13.8 volts or higher if you can.  It will result 
in a cleaner signal (lower IMD).
If you are using a supply with less than that voltage, it is wise to 
back down on the power a bit.


73,
Don W3FPR

On 2/10/2015 3:57 PM, Lynn W. Taylor, WB6UUT wrote:
I just looked at four bricks floating around my office, and two of 
them are 12v.  The other two are 18v and 19v.


The smallest one I have is 2a, which would probably charge the 
internal KX3 batteries.  The bigger one might be okay for transmitting.


That's why I specified 12v brick in my post.  There are many 
different bricks out there.


73 -- Lynn



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Re: [Elecraft] KX3 power supply brick

[David Ahrendts]

Lynn, I have used and was very happy with the PAE-Kx33  
https://proaudioeng.com/products/pae-kx33-ac-power-supply/ 
https://proaudioeng.com/products/pae-kx33-ac-power-supply/  
However, I acquired a few more Elecraft devices (PX3, KAT500, W2, and a relay 
for a larger amp), so I consolidated all of the 12VDC devices using a Power 
Werx 30 amp (more than enough) power supply 
http://www.powerwerx.com/power-supplies/ 
http://www.powerwerx.com/power-supplies/ 
with Anderson Power Poles and the red/black zip line. Very neat. It was 
Elecraft’s recommendation to use a single amp rather than several smaller 
bricks. They use Power Werx in the field. Appears the single DC amp is the 
quietest and cleanest.

David Ahrendts, KC0XT, LA 

 On Feb 10, 2015, at 12:26 PM, Lynn W. Taylor, WB6UUT 
 k...@coldrockshotbrooms.com wrote:
 
 Has anyone tried a 12v brick like most laptops use for their KX3?
 
 Comments one way or another??
 
 Thanks -- Lynn
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[Elecraft] KX3 power supply brick

[Lynn W. Taylor, WB6UUT]

Has anyone tried a 12v brick like most laptops use for their KX3?

Comments one way or another??

Thanks -- Lynn
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Re: [Elecraft] KX3 power supply brick

[Walter Underwood]

Most laptop bricks are 16V or higher, too much voltage for the KX3.

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/

On Feb 10, 2015, at 12:26 PM, Lynn W. Taylor, WB6UUT 
k...@coldrockshotbrooms.com wrote:

 Has anyone tried a 12v brick like most laptops use for their KX3?
 
 Comments one way or another??
 
 Thanks -- Lynn
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Re: [Elecraft] KX3 power supply brick

[David Christ]

I have run across some at lower voltages.  Look around.  I have checked some to 
make sure they didn’t rise too high under no load and for RFI.  A number seem 
pretty good.  These were all older ones.

David K0LUM


On Feb 10, 2015, at 2:34 PM, Walter Underwood wun...@wunderwood.org wrote:

 Most laptop bricks are 16V or higher, too much voltage for the KX3.
 
 wunder
 K6WRU
 CM87wj
 http://observer.wunderwood.org/
 
 On Feb 10, 2015, at 12:26 PM, Lynn W. Taylor, WB6UUT 
 k...@coldrockshotbrooms.com wrote:
 
 Has anyone tried a 12v brick like most laptops use for their KX3?
 
 Comments one way or another??
 
 Thanks -- Lynn
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Re: [Elecraft] KX3 power supply brick

[Bill Wilkins]

I used 11 5000 mah NIMH's, 13.2v. Then used a Pepsi plastic bottle for a
shrink wrap. But then I had a charger capable of charging the NIMH's.
Make sure the laptop bat is 12v and not something bigger with a regulator
inside the LT. Usually the charging is done by the LT I believe. If it is a
lithium battery you will need a special charger capable of lithium's. 
73, Bill, WD8JWJ



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Re: [Elecraft] KX3 Power Supply Recommendations

[MontyS]

n,

I have a Gamma Research supply, rated 5 amps continuous and 20 amps 
intermittent - adequate for a K3 at 100 watts SSB or CW.  I had a place for 
it in my KX3 travel case;  it is quite small and light.  It is expensive.  I 
have no connection to Gamma Reserch.


Monty K2DLJ

Hi,
I am looking for a small/light weight 12v (110/220v) switching power supply
for my KX3, rated for 3amps or more to take with me on the road.

Any recommendations?  More concerned with reliability and that it's quiet
than I am cost.

73s
Ron
AF1Q

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[Elecraft] KX3 Power Supply Recommendations

[Ron Bell]

Hi,
I am looking for a small/light weight 12v (110/220v) switching power supply
for my KX3, rated for 3amps or more to take with me on the road.

Any recommendations?  More concerned with reliability and that it's quiet
than I am cost.

73s
Ron
AF1Q
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Re: [Elecraft] KX3 Power Supply Recommendations

[David G4DMP]

Ron - If something similar to this is available in the USA, I would 
recommend this...

http://www.rapidonline.com/Electrical-Power/36W-Volt-Adjustable-Multi-Output-PSU-85-2908

I used one of these with my KX3 during a recent visit to Florida. It 
operates from 100 to 240V input and is supplied with a range of output 
connectors. By the use of fixed resistors plugged into its side, output 
voltages from 5 to 24V can be obtained. I used it with the 14V resistor 
and this provided adequate current to drive the KX3 to full power. 
Spurious radiation from the PSU was found to be minimal.


73

David

In a recent message, Ron Bell mongoose1...@googlemail.com writes

I am looking for a small/light weight 12v (110/220v) switching power supply
for my KX3, rated for 3amps or more to take with me on the road.

Any recommendations?  More concerned with reliability and that it's quiet
than I am cost.

--
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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[Elecraft] KX3 power supply

[Bruce Manning]

Has anyone found a wall wart supply that works well with the KX3? 


Connected by DROID on Verizon Wireless

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Re: [Elecraft] KX3 power supply

[Don Wilhelm]

Bruce,

Be cautious with wall wart supplies with the KX3.  Many are not 
regulated and also throw out spurious responses that may not bother some 
other receivers, but the KX3 with its 'direct to baseband' architecture 
is quite susceptible to that kind of power supply interference.  You 
will be more certain of success using a small (or large) linear supply 
rated at 13.8 to 15 volts at 3 amps or greater.  My KX3 is connected to 
a 35 amp Astron (with a suitable fuse - 5 amps).  That supply also 
powers the K3 and a number of shack accessories.


73,
Don W3FPR

On 1/14/2013 5:14 PM, Bruce Manning wrote:

Has anyone found a wall wart supply that works well with the KX3?


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Re: [Elecraft] KX3 power supply

[Fred Smith]

I used the MFJ PS for the FT-817 small about the size of a laptop PS and
plenty of reserve. It works very well in fact been using mine for over a
week now.

73,
Fred/N0AZZ

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bruce Manning
Sent: Monday, January 14, 2013 4:15 PM
To: elecraft
Subject: [Elecraft] KX3 power supply

Has anyone found a wall wart supply that works well with the KX3? 

Connected by DROID on Verizon Wireless

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Re: [Elecraft] KX3 power supply

[Don Pomplun]

Not a wallwart, but I just ordered a PS-1525 AllElectronics.com for $7. 




On Jan 14, 2013, at 2:14 PM, Bruce Manningbmann...@zitomedia.net wrote:

 Has anyone found a wall wart supply that works well with the KX3?
 Connected by DROID on Verizon Wireless
 
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Re: [Elecraft] KX3 Power Supply

[pkhjr]

Another suggestion is the Gamma Research HPS-1a, which has a very small
footprint and will power a 100 watt radio.  So if you get an amp you will be
covered.  I have the HPS-1a and it powers my K3 just fine and is easy to
transport for portable operation.
  
http://www.gammaresearch.net/hps-1a.html

73 Tex
ka5y





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Re: [Elecraft] KX3 Power Supply

[Josh Lehan]

I got a lucky find: searched some old laptop computer power supplies in the 
bins at Halted Electronics, a surplus store, and found a 15V power supply that 
was a good match.  Anything from 12V to 15V should work.  It is very small and 
fits in well with the KX3.

Josh
KJ6PVN

Sent from my iPhone

On Sep 14, 2012, at 17:40, TG9AJR tg9...@gmail.com wrote:

 Hi,
 
 I will like to get a small footprint power supply for my KX3 when in fix 
 operation.
 
 Any suggestions ?
 
 Thank you, 73 DX de
 
 Juan
 TG9AJR
 
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[Elecraft] KX3 Power Supply

[TG9AJR]

Hi,

I will like to get a small footprint power supply for my KX3 when in fix 
operation.

Any suggestions ?

Thank you, 73 DX de

Juan
TG9AJR

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Re: [Elecraft] KX3 Power Supply

[Don Wilhelm]

Why not use the power supp;y that powers the rest of the shack 
equipment  Nrmally in the hamshack environment the footprint is not 
important - put the power supply under the desk and it does not take up 
extra desk space.

Most of the battery/power supply discussions here has been about 
portable operation.  For Fixed operation, many more possibilities arise 
such as the Astron linear supplies.  I use a 35 amp to power everything 
in the shack, but you might get away with a 20 or 25 amp supply for a 
100 watt station.  If you are dedicated QRP, then a 6 amp power supply 
will be adequate.

73,
Don W3FPR


On 9/14/2012 8:40 PM, TG9AJR wrote:
 Hi,

 I will like to get a small footprint power supply for my KX3 when in fix 
 operation.

 Any suggestions ?

 Thank you, 73 DX de

 Juan
 TG9AJR

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Re: [Elecraft] KX3 Power Supply

[Bill Tubbs]

I already had the small MFJ-4103 for my FT817 and at 2.89 amps it works great 
so far. 

Bill
WK6A

Sent from my iPhone

On Sep 14, 2012, at 5:40 PM, TG9AJR tg9...@gmail.com wrote:

 Hi,
 
 I will like to get a small footprint power supply for my KX3 when in fix 
 operation.
 
 Any suggestions ?
 
 Thank you, 73 DX de
 
 Juan
 TG9AJR
 
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[Elecraft] KX3 Power Supply

[Dyarnes]

Several posts were recently made regarding the small Radio Shack switcher 
power supply (RS 22-507).  Most comments seemed pretty favorable about it. 
Anyway, one of those came available in a local estate sale for one of my ham 
friends who recently passed away.  I decided to give it a try, and it does 
seem to work well.  I scanned all my commonly used ham bands for noise and 
found none.  It seems to be pretty clean to me.  I also hooked up my K1 to 
it, and it ran that rig just fine.  Next I'll have to try the K2, but I 
suspect it will work fine with that rig also.

I don't much care for the list price Radio Shack is asking, but if you find 
one of these at a decent discount I think it's a good buy.  I have another 
similar supply, a Jetstream, but it's a tad bit bigger.  This RS model will 
be somewhat handier to tote around.  It's really quite small.  The Jetstream 
does work equally well, though, and has voltage and current metering.  I 
can't remember exactly, but that one is rated quite a bit higher as to 
current draw--maybe even 8 or 10 amps or a bit more.  Still, it's just 
enough bigger to make the RS model seem more convenient for specific use 
with the KX3.  By the way, no detectable noise on the Jetstream either.  I 
think several of their models have been given favorable reviews.

  Dave W7AQK 

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[Elecraft] KX3 power supply question

[Lance Collister, W7GJ]

Does anyone know if the KX3 can be used with an external 12-14 VDC power supply 
WITHOUT any batteries installed?  I know some devices such as computers require 
the 
batteries to be inserted even if they are not any good, to complete the circuit.

Leaving the batteries at home when traveling would help keep the weight down... 
 VY 
73, Lance
-- 
Lance Collister, W7GJ
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Re: [Elecraft] KX3 power supply question

[Wayne Burdick]

On Dec 29, 2011, at 11:03 AM, Lance Collister, W7GJ wrote:

 Does anyone know if the KX3 can be used with an external 12-14 VDC  
 power supply
 WITHOUT any batteries installed?

Yes. And if you have both, whichever has the higher voltage (external  
supply or internal battery) will be powering the radio.

Wayne
N6KR

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