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k3 switching supply

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NE9U - Jasper

k3 switching supply

I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.

anyone have suggestions for a good quiet k3 switching supply?

scott ne9u

Sent from Republic Wireless Cray-1
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Gary Gregory-2

Re: k3 switching supply

Scott,

On the contrary, I have had two of these units since they were first
introduced to the market and I have used other operators units as well, all
without any issues at all and there have been numerous comments on the
reflector that have reflected this same experience.

I have only used my pair with both the K3 and KX3 and at no time have I had
any issues with noise from these units.

Previously I have had several switch mode supplies and they all introduced
noise at some point, unlike my experience with the SS30 units. Neither of
mine have the LED display.

Regards,
Gary

On 16 June 2015 at 15:22, NE9U - Jasper <[hidden email]> wrote:

>
> I was about to order a switching supply for portable/dxpedition use and
> thought the one on elecraft site must be a good one, but i see it is
> getting poor reviews on eham.net for RFI/noise generation issues.
>
> anyone have suggestions for a good quiet k3 switching supply?
>
> scott ne9u
>
>
> Sent from Republic Wireless Cray-1
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>

--

*Gary - VK1ZZ, K3NHLSkype: Gary.VK1ZZhttp://www.qsl.net/vk1zz
<http://www.qsl.net/vk1zz>Motorhome Portable*
*Miss Behavin'*

*Elecraft K3KPA500FT #18KAT500FT #007*
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Jim Brown-10

Re: k3 switching supply

In reply to this post by NE9U - Jasper

On Mon,6/15/2015 10:22 PM, NE9U - Jasper wrote:
> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.

I had one of these that i used for several years until I blew it up (by
mis-treating it).

Note, however, that most of us have varying levels of RF noise in our
environments, and many of us connect equipment together poorly. Whether
or not you hear noise from a particular product will depend on how much
noise is in your environment, how close your antennas are to the noisy
equipment, the frequencies on which you listen, and how you have
interconnected things together.

I probe for RF noise using a Kenwood TH-F6A talkie in close proximity to
the equipment and its wiring. I found the PowerWerx unit RF-quiet, and I
plan to buy a replacement for it.

73, Jim K9YC
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Johnny Siu

k3 switching supply

I am using an Alinco DM330MVE, very quiet, no RFI
http://www.alinco.com/Products/DM330MVE/
73
Johnny VR2XMC
寄件人︰ Jim Brown <[hidden email]>
收件人︰ [hidden email]
傳送日期︰ 2015年06月16日 (週二) 1:42 PM
主題︰ Re: [Elecraft] k3 switching supply

On Mon,6/15/2015 10:22 PM, NE9U - Jasper wrote:
> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.

I had one of these that i used for several years until I blew it up (by
mis-treating it).

Note, however, that most of us have varying levels of RF noise in our
environments, and many of us connect equipment together poorly. Whether
or not you hear noise from a particular product will depend on how much
noise is in your environment, how close your antennas are to the noisy
equipment, the frequencies on which you listen, and how you have
interconnected things together.

I probe for RF noise using a Kenwood TH-F6A talkie in close proximity to
the equipment and its wiring. I found the PowerWerx unit RF-quiet, and I
plan to buy a replacement for it.

73, Jim K9YC

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Ken Wagner K3IU

Re: k3 switching supply

In reply to this post by NE9U - Jasper

G'morning, Scott:
I have been using a SS30 for several years (before Elecraft
began selling them) and have had no noise issues with it.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 6/16/2015 1:22 AM, NE9U - Jasper wrote:

> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>
> anyone have suggestions for a good quiet k3 switching supply?
>
> scott ne9u
>
>
> Sent from Republic Wireless Cray-1
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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MarcV

Re: k3 switching supply

Mine is 6 months old, the version with the LED display, and the moving birdies on 80 and 75 meters are so strong and so annoying that I turn the supply off and operate from batteries if I operate for only an hour or so. I’m sorry I bought the PowerWerx even though it is good looking and a nice size for my small operating desk.

Apparently their quality control is a variable, just like my birdies.
—
Marc W8SDG

> On 6/16/2015 1:22 AM, NE9U - Jasper wrote:
>> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>>
>> anyone have suggestions for a good quiet k3 switching supply?
>>
>> scott ne9u
>>
>>

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Bill-3

Re: k3 switching supply

I have had mine for about six months and use it only on the K3 station.
No noise and rock solid voltage regulation.

Bill W2BLC K-Line

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Matt Zilmer-3

Re: k3 switching supply

In reply to this post by NE9U - Jasper

I have two SMSSs here:

Powerwerx SS30DV - used as aux supply for VHF FM and other aux
devices.

Samlex SEC1235M - used for K3, KX3, supplemental battery charge
current source.

Neither have appreciable RFI issues.

73,
matt
W6NIA

On Tue, 16 Jun 2015 00:22:36 -0500, you wrote:

>
>I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>
>anyone have suggestions for a good quiet k3 switching supply?
>
>scott ne9u
>
>
>Sent from Republic Wireless Cray-1
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
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Elecraft mailing list

Re: k3 switching supply

Another SMSS is the ColdFusion S-350-12. 12 VDC @29A, No appreciable RFI, over 5 years in service $45.

Mel, K6KBE

From: Matt Zilmer <[hidden email]>
To: NE9U - Jasper <[hidden email]>
Cc: "[hidden email]" <[hidden email]>
Sent: Tuesday, June 16, 2015 6:58 AM
Subject: Re: [Elecraft] k3 switching supply

I have two SMSSs here:

Powerwerx SS30DV - used as aux supply for VHF FM and other aux
devices.

Samlex SEC1235M - used for K3, KX3, supplemental battery charge
current source.

Neither have appreciable RFI issues.

73,
matt
W6NIA

On Tue, 16 Jun 2015 00:22:36 -0500, you wrote:

Matt Zilmer, W6NIA
--
"Always store beer in a dark place." -R. Heinlein

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Re: k3 switching supply

In reply to this post by Johnny Siu

Johnny VR2XMC wrote - I am using an Alinco DM330MVE, very quiet, no RFI
http://www.alinco.com/Products/DM330MVE/

I use the same supply. Works great - no RFI!73,
Bob/AA6VB
From: Johnny Siu <[hidden email]>
To: "[hidden email]" <[hidden email]>
Sent: Monday, June 15, 2015 10:49 PM
Subject: [Elecraft] k3 switching supply

I am using an Alinco DM330MVE, very quiet, no RFI
http://www.alinco.com/Products/DM330MVE/
73

寄件人︰ Jim Brown <[hidden email]>
收件人︰ [hidden email]
傳送日期︰ 2015年06月16日 (週二) 1:42 PM
主題︰ Re: [Elecraft] k3 switching supply

On Mon,6/15/2015 10:22 PM, NE9U - Jasper wrote:
> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.

I had one of these that i used for several years until I blew it up (by
mis-treating it).

Note, however, that most of us have varying levels of RF noise in our
environments, and many of us connect equipment together poorly. Whether
or not you hear noise from a particular product will depend on how much
noise is in your environment, how close your antennas are to the noisy
equipment, the frequencies on which you listen, and how you have
interconnected things together.

I probe for RF noise using a Kenwood TH-F6A talkie in close proximity to
the equipment and its wiring. I found the PowerWerx unit RF-quiet, and I
plan to buy a replacement for it.

73, Jim K9YC

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Ignacy

Re: k3 switching supply

In reply to this post by NE9U - Jasper

All switching power supplies emit something but whether their noise is heard or not depends on antennas. The noise is heard more with very close antennas and not all all with those farther away. Also more with unbalanced antennas especially is coax is part of the antenna system.

There are many noise emitting sources that usually do not bother K3. For instance, P3 emits very strong noise when checked with antenna close to it. But I cannot hear any noise from P3 using my external antennas.

I used MFJ 4125 and 4225. They generate weak moving streaks on P3 at my QTH, but no problem. Jetstream JTPS31MB is smaller and a bit quieter.

Ignacy, NO9E

Richard Fjeld-2

Re: k3 switching supply

On 6/16/2015 10:32 AM, Ignacy wrote:

> All switching power supplies emit something but whether their noise is heard
> or not depends on antennas. The noise is heard more with very close antennas
> and not all all with those farther away. Also more with unbalanced antennas
> especially is coax is part of the antenna system.
>
> There are many noise emitting sources that usually do not bother K3. For
> instance, P3 emits very strong noise when checked with antenna close to it.
> But I cannot hear any noise from P3 using my external antennas.
>
> I used MFJ 4125 and 4225. They generate weak moving streaks on P3 at my QTH,
> but no problem. Jetstream JTPS31MB is smaller and a bit quieter.
>
> Ignacy, NO9E
>
>
>
>
>

FWIW, a comment to say I have noticed in threads like this that I had
been using the same power supplies
(several) that people are criticizing, and mine have been working
perfectly. Your analysis may be why.

One exception could be noted. I do have a SS-30A that I had to solder
the fan wires on the board to eliminate a whine
that could be heard in tx/rx when the fan would run, but no problem
since. Perhaps the operating frequency need be stated.

Dick, n0ce

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Fred Townsend-2

Re: k3 switching supply

In reply to this post by MarcV

Marc I do RFI for a living. When I purchased my PowerWerx I made sure it was returnable if I found noise on it. I checked and found everything was well below published specifications so I retained the supply and have very successfully used it in the Sierras where there is virtually no man made noise which makes it sheer joy to operate. This unit was purchased before the model with LED displays was even available.

Back in the days where commercial transmitters had scores of meters it was standard practice to shield those meters so RF would not leak out of the transmitter cabinet. I traced a problem in one HP unit to an unshielded LCD display. I suspect it may be the LED display itself in your PowerWerx that is causing your RFI. Personally I do not see the need of the meters when I can read the voltage on the K3 itself. After all it is the voltage at the K3 that counts. Not the voltage at the power supply.

73, Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Marc Veenemanno made
Sent: Tuesday, June 16, 2015 3:26 AM
To: [hidden email]
Cc: NE9U - Jasper
Subject: Re: [Elecraft] k3 switching supply

Mine is 6 months old, the version with the LED display, and the moving birdies on 80 and 75 meters are so strong and so annoying that I turn the supply off and operate from batteries if I operate for only an hour or so. I’m sorry I bought the PowerWerx even though it is good looking and a nice size for my small operating desk.

Apparently their quality control is a variable, just like my birdies.
—
Marc W8SDG

> On 6/16/2015 1:22 AM, NE9U - Jasper wrote:
>> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>>
>> anyone have suggestions for a good quiet k3 switching supply?
>>
>> scott ne9u
>>
>>

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MarcV

Re: k3 switching supply

Fred, you could be right about the meters being the problem. There are times when the birdies will be quite stable, and other times when the move completely across the P3 (or PX3) 40 kHz display in a dozen or so seconds. At this moment they are stable but the meter reads a, also stable, 1.9 amps at 14.0 volts.

I’ll keep an eye on that.

I bought directly from PowerWerx but my e-mail to them about the problem went unanswered. Maybe a phone call is in order — and I think I’d like them to substitute the meterless version.

I wish I had your foresight. Instead I relied on the reviews I could find on the Internet. :-)
—
Marc W8SDG

> On Jun 17, 2015, at 3:02 AM, Fred Townsend <[hidden email]> wrote:
>
> Marc I do RFI for a living. When I purchased my PowerWerx I made sure it was returnable if I found noise on it. I checked and found everything was well below published specifications so I retained the supply and have very successfully used it in the Sierras where there is virtually no man made noise which makes it sheer joy to operate. This unit was purchased before the model with LED displays was even available.
>
> Back in the days where commercial transmitters had scores of meters it was standard practice to shield those meters so RF would not leak out of the transmitter cabinet. I traced a problem in one HP unit to an unshielded LCD display. I suspect it may be the LED display itself in your PowerWerx that is causing your RFI. Personally I do not see the need of the meters when I can read the voltage on the K3 itself. After all it is the voltage at the K3 that counts. Not the voltage at the power supply.
>
> 73, Fred, AE6QL
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Marc Veenemanno made
> Sent: Tuesday, June 16, 2015 3:26 AM
> To: [hidden email]
> Cc: NE9U - Jasper
> Subject: Re: [Elecraft] k3 switching supply
>
> Mine is 6 months old, the version with the LED display, and the moving birdies on 80 and 75 meters are so strong and so annoying that I turn the supply off and operate from batteries if I operate for only an hour or so. I’m sorry I bought the PowerWerx even though it is good looking and a nice size for my small operating desk.
>
> Apparently their quality control is a variable, just like my birdies.
> —
> Marc W8SDG
>
>> On 6/16/2015 1:22 AM, NE9U - Jasper wrote:
>>> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>>>
>>> anyone have suggestions for a good quiet k3 switching supply?
>>>
>>> scott ne9u
>>>
>>>
>
> ______________________________________________________________
> Elecraft mailing list
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>

MarcV

Re: k3 switching supply

Emory, I've relied upon the power cable for grounding without giving a separate wire or strap any thought. Today sometime I'm going to run a ground strap between the K3 and PowerWerx to see if that helps. Thanks for sharing your experience and thanks for the suggestion.

I'm not sure why I didn't think of that myself. It's just that I never think of a power supply in terms of station grounding.

73,
Marc W8SDG

> On Jun 17, 2015, at 7:45 AM, <[hidden email]> <[hidden email]> wrote:
>
> Marc,
> I have two of those power supplies, both without the meter. I did have RFI from one of them when I had power for a keyer connected to the front power pole connectors, disconnecting it, RFI went away. I also had a problem with RF getting into the transmit signal. When I connected station ground to the power supply that went away, I think it was a ground loop. With these changes I now have no RFI from either one.
> Hope this helps. 73
> Emory WM3M
>
> -----Original Message----- From: Marc Veeneman
> Sent: Wednesday, June 17, 2015 6:34 AM
> To: Fred Townsend
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] k3 switching supply
>
> Fred, you could be right about the meters being the problem. There are times when the birdies will be quite stable, and other times when the move completely across the P3 (or PX3) 40 kHz display in a dozen or so seconds. At this moment they are stable but the meter reads a, also stable, 1.9 amps at 14.0 volts.
>
> I’ll keep an eye on that.
>
> I bought directly from PowerWerx but my e-mail to them about the problem went unanswered. Maybe a phone call is in order — and I think I’d like them to substitute the meterless version.
>
> I wish I had your foresight. Instead I relied on the reviews I could find on the Internet. :-)
> —
> Marc W8SDG
>
>> On Jun 17, 2015, at 3:02 AM, Fred Townsend <[hidden email]> wrote:
>>
>> Marc I do RFI for a living. When I purchased my PowerWerx I made sure it was returnable if I found noise on it. I checked and found everything was well below published specifications so I retained the supply and have very successfully used it in the Sierras where there is virtually no man made noise which makes it sheer joy to operate. This unit was purchased before the model with LED displays was even available.
>>
>> Back in the days where commercial transmitters had scores of meters it was standard practice to shield those meters so RF would not leak out of the transmitter cabinet. I traced a problem in one HP unit to an unshielded LCD display. I suspect it may be the LED display itself in your PowerWerx that is causing your RFI. Personally I do not see the need of the meters when I can read the voltage on the K3 itself. After all it is the voltage at the K3 that counts. Not the voltage at the power supply.
>>
>> 73, Fred, AE6QL
>>
>> -----Original Message-----
>> From: Elecraft [mailto:[hidden email]] On Behalf Of Marc Veenemanno made
>> Sent: Tuesday, June 16, 2015 3:26 AM
>> To: [hidden email]
>> Cc: NE9U - Jasper
>> Subject: Re: [Elecraft] k3 switching supply
>>
>> Mine is 6 months old, the version with the LED display, and the moving birdies on 80 and 75 meters are so strong and so annoying that I turn the supply off and operate from batteries if I operate for only an hour or so. I’m sorry I bought the PowerWerx even though it is good looking and a nice size for my small operating desk.
>>
>> Apparently their quality control is a variable, just like my birdies.
>> —
>> Marc W8SDG
>>
>>>> On 6/16/2015 1:22 AM, NE9U - Jasper wrote:
>>>> I was about to order a switching supply for portable/dxpedition use and thought the one on elecraft site must be a good one, but i see it is getting poor reviews on eham.net for RFI/noise generation issues.
>>>>
>>>> anyone have suggestions for a good quiet k3 switching supply?
>>>>
>>>> scott ne9u
>>>>
>>>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>
>
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Jim Brown-10

Re: k3 switching supply

On Wed,6/17/2015 4:55 AM, Marc Veeneman wrote:
> When I connected station ground to the power supply that went away, I think it was a ground loop.

Wrong word, correct solution. The correct word is "bonding," and there
ain't no such thing as a "ground loop." What there IS is a difference in
potential between the chassis of one device and the other. When you bond
chassis to chassis, you reduce that difference to a small value.

> With these changes I now have no RFI from either one.

Proper station bonding is quite important, both for safety and to
minimize noise. But a connection to EARTH, while important for lightning
protection, is not part of a solution for hum, buzz, or RFI.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC

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Re: k3 switching supply

Jim, are you not contradicting yourself?
>>> " and there
ain't no such thing as a "ground loop." <<<

>> What there IS is a difference in
potential between the chassis of one device and the other. <<
Isn't your stated wording almost the exact wording used by many, including Wikipedia as a " Ground Loop"
I'm a bit confused.

((((73)))) Milverton / W9MMS.

From: Jim Brown <[hidden email]>
To: [hidden email]
Sent: Thursday, June 18, 2015 1:38 PM
Subject: Re: [Elecraft] k3 switching supply

On Wed,6/17/2015 4:55 AM, Marc Veeneman wrote:
> When I connected station ground to the power supply that went away, I think it was a ground loop.

Wrong word, correct solution. The correct word is "bonding," and there
ain't no such thing as a "ground loop." What there IS is a difference in
potential between the chassis of one device and the other. When you bond
chassis to chassis, you reduce that difference to a small value.

> With these changes I now have no RFI from either one.

Proper station bonding is quite important, both for safety and to
minimize noise. But a connection to EARTH, while important for lightning
protection, is not part of a solution for hum, buzz, or RFI.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC

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Jim Brown-10

Re: k3 switching supply

On Thu,6/18/2015 12:14 PM, [hidden email] wrote:

> Jim, are you not contradicting yourself?
>
> >>> " and there
> ain't no such thing as a "ground loop." <<<
>
> >> What there IS is a difference in
> potential between the chassis of one device and the other. <<
>
> Isn't your stated wording almost the exact wording used by many,
> including Wikipedia as a " Ground Loop"

The words "ground loop" are misleading, because they do not describe
what is going on, which in turn causes people to do dumb things to solve
the problem.

I've not read the Wikipedia entry. Rather, I'm using EE circuit analysis
101.

73, Jim K9YC

>
> I'm a bit confused.
>
> ((((73)))) Milverton / W9MMS.
>
>
> ------------------------------------------------------------------------
> *From:* Jim Brown <[hidden email]>
> *To:* [hidden email]
> *Sent:* Thursday, June 18, 2015 1:38 PM
> *Subject:* Re: [Elecraft] k3 switching supply
>
> On Wed,6/17/2015 4:55 AM, Marc Veeneman wrote:
> > When I connected station ground to the power supply that went away,
> I think it was a ground loop.
>
> Wrong word, correct solution. The correct word is "bonding," and there
> ain't no such thing as a "ground loop." What there IS is a difference in
> potential between the chassis of one device and the other. When you bond
> chassis to chassis, you reduce that difference to a small value.
>
> > With these changes I now have no RFI from either one.
>
> Proper station bonding is quite important, both for safety and to
> minimize noise. But a connection to EARTH, while important for lightning
> protection, is not part of a solution for hum, buzz, or RFI.
>
> http://k9yc.com/GroundingAndAudio.pdf
>
> 73, Jim K9YC
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email] <mailto:[hidden email]>
>
> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email] <mailto:[hidden email]>
>
>

John Freed

Re: k3 switching supply

In reply to this post by Elecraft mailing list

Hi!! I have a K3 ser# 07023. I use a MFJ-4125P switching power supply to
operate my rig. Using it with my K3 for over a year. No problems. The
Elecraft K3 switching power supply should work as well if not better than
the MFJ where noise (rf and otherwise) is concerned. The ARRL has several
reviews of switching power supplies in their on line archives.
Hope this helps and / or adds to the conversation.

>> John, KX6F <<

-----Original Message-----
From: Milverton M. Swire via Elecraft
Sent: Thursday, June 18, 2015 2:14 PM
To: [hidden email] ; [hidden email]
Subject: Re: [Elecraft] k3 switching supply

Jim, are you not contradicting yourself?
>>> " and there
ain't no such thing as a "ground loop." <<<

>> What there IS is a difference in
potential between the chassis of one device and the other. <<
Isn't your stated wording almost the exact wording used by many, including
Wikipedia as a " Ground Loop"
I'm a bit confused.

((((73)))) Milverton / W9MMS.

From: Jim Brown <[hidden email]>
To: [hidden email]
Sent: Thursday, June 18, 2015 1:38 PM
Subject: Re: [Elecraft] k3 switching supply

On Wed,6/17/2015 4:55 AM, Marc Veeneman wrote:
> When I connected station ground to the power supply that went away, I
> think it was a ground loop.

Wrong word, correct solution. The correct word is "bonding," and there
ain't no such thing as a "ground loop." What there IS is a difference in
potential between the chassis of one device and the other. When you bond
chassis to chassis, you reduce that difference to a small value.

> With these changes I now have no RFI from either one.

Proper station bonding is quite important, both for safety and to
minimize noise. But a connection to EARTH, while important for lightning
protection, is not part of a solution for hum, buzz, or RFI.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

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Petr, OK1RP/M0SIS

Re: k3 switching supply

In reply to this post by NE9U - Jasper

Hi,

try this one:
http://www.repeater-builder.com/other-mfrs/megawatt-ps/megawatt-ps.html
http://www.12voltpowersupplies.us/

Even although I am using always linear PSUs for powering my radios I tested some time ago this unit and it was noiseless and quiet. Also You can find several good user reports so it sounds like good solution.

You should stay away from offshore clones only...

Hope it helps,
73 - Petr, OK1RP

73 - Petr, OK1RP
"Apple & Elecraft freak"
B:http://ok1rp.blogspot.com
MeWe: https://bit.ly/2HGPoDx
MeWe: https://bit.ly/2FmwvDt