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Reliable DC Power Supply for K3/P3

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Robert Nobis - N7RJN

Reliable DC Power Supply for K3/P3

I m about ready to place an order for a K3 and P3, and wonder if there are
recommendations on a reliable DC power supply for the Elecraft 100-W
transceiver.

73,

Bob - N7RJN

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KE8G

Re: Reliable DC Power Supply for K3/P3

Hi Bob,
This is a question that comes up from time-to-time and you will get a multitude of answers!

Personally, I have a couple of the Astron Power Supplies RS-35M and think they are fantastic. One of these is more than enough to run 24x7 and handle the K3/100 with plenty to spare.

Just my .2 cents.

73 de Jim - KE8G

---- Robert Nobis <[hidden email]> wrote:

> I m about ready to place an order for a K3 and P3, and wonder if there are
> recommendations on a reliable DC power supply for the Elecraft 100-W
> transceiver.
>
> 73,
>
> Bob - N7RJN
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Don Wilhelm-4

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Robert Nobis - N7RJN

Bob,

The old reliable Astron 35 is a very good linear supply - I do not have
the metered version, and mine sits quietly on the floor under the desk,
no need to look at meters there.

I also have an Astron SS30 which does a great job at the workbench.
Again no need for meters, and even though a switcher, I have not found
any switching noise created in the ham bands.

As backups, I have an MFJ 25 amp switching supply and an Alinco 340M
linear - the advantages of those supplies is that the output voltage is
front panel adjustable. No noticeable noise from the switcher and the
current is more than sufficient for the K3/100.

If you have other accessories, you might want to look at a 35 amp
supply, but 20 or 25 amps is all that is needed for the K3.

73,
Don W3FPR

On 11/19/2013 9:35 AM, Robert Nobis wrote:

Fred Smith-2

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Robert Nobis - N7RJN

Hi Bob

I personally run quite a few shack DC items with mine including a 300w 2m
amp along with a battery charger. The charger is one that charges an Optima
back-up battery while the power is on keeps it charged quite well. After
going through about 7 or 8 supplies most I still have I bought a Astron
VS-70M and takes care of everything plus with the variable supply you can
set the voltage you want.

If you just want a supply for those items the Astron RS-35M is a great
supply.

73,
Fred/N0AZZ
K3 Ser # 6730--KX3 # 5210--K2/100 # 6470-KAT100
P3/SVGA--KAT500--W2
Amps Elecraft KPA500 HF/6m--Alpha's 9500 HF--87A HF--Mirage B-5030-G
300+w--(2) B-5016-G's 165w 2m

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Robert Nobis
Sent: Tuesday, November 19, 2013 8:35 AM
To: [hidden email]
Subject: [Elecraft] Reliable DC Power Supply for K3/P3

I m about ready to place an order for a K3 and P3, and wonder if there are
recommendations on a reliable DC power supply for the Elecraft 100-W
transceiver.

73,

Bob - N7RJN

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Vic Rosenthal

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Robert Nobis - N7RJN

Another vote for the Astron linear 35A supply. Mine is an RS-35 (no meters), I've had it
for years and it just runs and runs. Many will suggest switching supplies because they are
lighter and less expensive for a given current rating, but they are less reliable and
there is always the potential for noise. In my opinion, of course!

On 11/19/2013 6:35 AM, Robert Nobis wrote:
> I m about ready to place an order for a K3 and P3, and wonder if there are
> recommendations on a reliable DC power supply for the Elecraft 100-W
> transceiver.
>
> 73,
>
> Bob - N7RJN

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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Hisashi T Fujinaka

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Don Wilhelm-4

The only thing that bit me: Astron XX does not mean XX amps. I have an
Astron 25M and I was trying to figure out why my K2/100 would power off
on 15M at 100W when I finally figured out that that the Astron 25 is a
20 amp power supply and my K2 needed a bit more. It would even fold
back the voltage. After more debugging (and lots of bypass caps &
chokes and dummy loads and a brand new oscilloscope) and I found that RF
in the shack could be part of the problem but just swapping to an Astron
35M was my fix.

Unfortunately, the Astron puts out a lot of heat, and my shack happens
to be in a room that gets pretty warm even with the A/C on. So I changed
to a 25A switching power supply which unfortunately has a fan. Now the
tradeoff is heat vs. fan.

On Tue, 19 Nov 2013, Don Wilhelm wrote:

> Bob,
>
> The old reliable Astron 35 is a very good linear supply - I do not have the
> metered version, and mine sits quietly on the floor under the desk, no need
> to look at meters there.
>
> I also have an Astron SS30 which does a great job at the workbench. Again no
> need for meters, and even though a switcher, I have not found any switching
> noise created in the ham bands.
>
> As backups, I have an MFJ 25 amp switching supply and an Alinco 340M linear -
> the advantages of those supplies is that the output voltage is front panel
> adjustable. No noticeable noise from the switcher and the current is more
> than sufficient for the K3/100.
>
> If you have other accessories, you might want to look at a 35 amp supply, but
> 20 or 25 amps is all that is needed for the K3.
>
> 73,
> Don W3FPR
>
> On 11/19/2013 9:35 AM, Robert Nobis wrote:
>> I m about ready to place an order for a K3 and P3, and wonder if there are
>> recommendations on a reliable DC power supply for the Elecraft 100-W
>> transceiver.
>>
>> 73,
>>
>> Bob - N7RJN
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
> ______________________________________________________________
> 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
>

--
Hisashi T Fujinaka - [hidden email]
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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Paul M Dunphy

Re: Reliable DC Power Supply for K3/P3

In reply to this post by KE8G

On 11/19/2013 10:41 AM, Jim - KE8G wrote:

> Hi Bob,
> This is a question that comes up from time-to-time and you will get a multitude of answers!
>
> Personally, I have a couple of the Astron Power Supplies RS-35M and think they are fantastic. One of these is more than enough to run 24x7 and handle the K3/100 with plenty to spare.
>
> Just my .2 cents.
>
> 73 de Jim - KE8G
>
>

I'm using a cheap switching PS . . . a SPS-400MA (12V, 40A):

http://www.409shop.com/409shop_product.php?id=104969

I have NO affiliation with that web site nor the manufacturer of
the PS! I also see those guys no longer have it "The item you are
trying to view does not exist or was suspended by the site admin." I'm
sure it can be found elsewhere on the Internet of from local re-sellers.

Anyhow, it replaced an Astron 1.5 years ago and is 1/4 the size or
smaller. Been running 24/7 since I got it and it powers the entire
shack. No birdies, although there is a knob to "move" them if they are
there.

I took a chance on buying this (less than $200) and I'm very happy.
90-95% efficiency with switching supplies, very small and not
expensive. I wasn't optimistic, but it chugs right along . . .

The Astron is now the backup.

73, Paul VE1DX

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Robert Nobis - N7RJN

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Robert Nobis - N7RJN

Everyone,

Thank you. It looks like using an Astron supply is the way to go. I will
probably go with the RS-50, as I also have a Yaesu 2M/70cm rig to power.

Incidentally, this mailing list was one of the major reasons why I decided
to get the Elecraft K3/P3 instead of competing products made in Japan. I
have found the members of this list quick to respond to questions from
others, with great answers.

Again, thank you.

73,

Bob - N7RJN

On 11/19/13, 7:35 AM, "Robert Nobis" <[hidden email]> wrote:

>I m about ready to place an order for a K3 and P3, and wonder if there are
>recommendations on a reliable DC power supply for the Elecraft 100-W
>transceiver.
>
>73,
>
>Bob - N7RJN
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html

Josh Fiden

Re: Reliable DC Power Supply for K3/P3

Hi Bob,

Just a note because the RS-50 is a real tank (heavy). I use 2x SS-30M
which power 5 high current devices (K3/P3, TS790A, IC910H and 2 brick
amps). Each power supply is only capable of powering one of these
devices during transmit, but since I don't transmit on multiple radios
concurrently, that's not a problem.

So, unless you need to transmit on the K3 and VHF radio at the same
time, you can get by with a smaller/lighter/cheaper supply. Of course
nothing wrong with overhead and room for expansion!

73,
Josh W6XU

On 11/19/2013 9:54 AM, Robert Nobis wrote:

> Everyone,
>
> Thank you. It looks like using an Astron supply is the way to go. I will
> probably go with the RS-50, as I also have a Yaesu 2M/70cm rig to power.
>
> Incidentally, this mailing list was one of the major reasons why I decided
> to get the Elecraft K3/P3 instead of competing products made in Japan. I
> have found the members of this list quick to respond to questions from
> others, with great answers.
>
> Again, thank you.
>
> 73,
>
>
> Bob - N7RJN
>
>
>
> On 11/19/13, 7:35 AM, "Robert Nobis" <[hidden email]> wrote:
>
>> I m about ready to place an order for a K3 and P3, and wonder if there are
>> recommendations on a reliable DC power supply for the Elecraft 100-W
>> transceiver.
>>
>> 73,
>>
>> Bob - N7RJN
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Jim Brown-10

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Robert Nobis - N7RJN

On 11/19/2013 6:35 AM, Robert Nobis wrote:
> I m about ready to place an order for a K3 and P3, and wonder if there are
> recommendations on a reliable DC power supply for the Elecraft 100-W
> transceiver.

For the last ten years, I've been powering all the 12V gear from a deep
cycle battery (Costco's largest) that I float charge from a regulated
power supply. The result is a rather robust UPS for the key elements of
the ham station. While the Astron supplies have a well-deserved
reputation for reliability (and I've used several of them), my present
choice is a 20A Power Werx switching supply that I bought to take on a
DX trip several years ago. It's RF quiet, the regulation voltage is
13.8V as shipped, and it can be varied (internal pot) to adjust to the
needs of the battery you're using.

Such a system is also easily adapted to solar by the addition of solar
cells and a charge regulator, and I did that recently.

73, Jim K9YC

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Phil Hystad-3

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Josh Fiden

I use an RS-50M and yes it is indeed a real heavy tank. But, then again, it sits on the floor, it is not in the way at all, and it is on all the time (except when I am away from the house for more than a couple of days). I use it to feed a West Mountain Radio Rig Runner 8012. Perfect set up for my QTH.

I also have the RS-30M which I use as my "portable" power supply. By portable, I mean portable here at this QTH such as in the garage when doing experiments or building something, out on the back patio when I am operating "remote" in the sun-shine, or sitting (also on the floor) in a convenient location where I use it to drive my Li-ion battery charger.

The RS-50M via the Rig Runner drives about six or seven different rigs -- all plugged into the power (Anderson connectors) but obviously not all on. I have a variety of 12 volt DC things that came with their own wall wart but I prefer to use them with the Rig Runner so they now all sport Anderson Power Pole connectors.

73, phil, K7PEH

On Nov 19, 2013, at 10:14 AM, Josh Fiden <[hidden email]> wrote:

> Hi Bob,
>
> Just a note because the RS-50 is a real tank (heavy). I use 2x SS-30M which power 5 high current devices (K3/P3, TS790A, IC910H and 2 brick amps). Each power supply is only capable of powering one of these devices during transmit, but since I don't transmit on multiple radios concurrently, that's not a problem.
>
> So, unless you need to transmit on the K3 and VHF radio at the same time, you can get by with a smaller/lighter/cheaper supply. Of course nothing wrong with overhead and room for expansion!
>
> 73,
> Josh W6XU
>
> On 11/19/2013 9:54 AM, Robert Nobis wrote:
>> Everyone,
>>
>> Thank you. It looks like using an Astron supply is the way to go. I will
>> probably go with the RS-50, as I also have a Yaesu 2M/70cm rig to power.
>>
>> Incidentally, this mailing list was one of the major reasons why I decided
>> to get the Elecraft K3/P3 instead of competing products made in Japan. I
>> have found the members of this list quick to respond to questions from
>> others, with great answers.
>>
>> Again, thank you.
>>
>> 73,
>>
>>
>> Bob - N7RJN
>>
>>
>>
>> On 11/19/13, 7:35 AM, "Robert Nobis" <[hidden email]> wrote:
>>
>>> I m about ready to place an order for a K3 and P3, and wonder if there are
>>> recommendations on a reliable DC power supply for the Elecraft 100-W
>>> transceiver.
>>>
>>> 73,
>>>
>>> Bob - N7RJN
>>>
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
> ______________________________________________________________
> 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

Hisashi T Fujinaka

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Hisashi T Fujinaka

As far as I know, they are NOT rated Intermittent COMMERICIAL Service.
They're rated Intermittent COMMUNICATIONS Service, which is something
they made up. It's way lower than you think.

On Tue, 19 Nov 2013, Ron D'Eau Claire wrote:

> Astrons are rated ICS (Intermittent Commercial Service). Old timers in the
> Ham hobby will remember that as ICAS (Intermittent Commercial and Amateur
> Service).
>
> For example, the Astron spec sheet for the Astron 20 will show a continuous
> current rating of 16 amps and an ICAS rating of 20 amps.
>
> One can demand 20 amps peak for SSB or even CW operation and even normal
> high-duty-cycle operation with a few minutes at 20 amps and then a few
> minutes in standby.
>
> But, beyond that, it's likely to overheat and shut down to protect itself.
>
> 73, Ron AC7AC
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Hisashi T Fujinaka
> Sent: Tuesday, November 19, 2013 8:34 AM
> To: Robert Nobis
> Cc: [hidden email]
> Subject: Re: [Elecraft] Reliable DC Power Supply for K3/P3
>
> The only thing that bit me: Astron XX does not mean XX amps. I have an
> Astron 25M and I was trying to figure out why my K2/100 would power off on
> 15M at 100W when I finally figured out that that the Astron 25 is a
> 20 amp power supply and my K2 needed a bit more. It would even fold back the
> voltage. After more debugging (and lots of bypass caps & chokes and dummy
> loads and a brand new oscilloscope) and I found that RF in the shack could
> be part of the problem but just swapping to an Astron 35M was my fix.
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Eric Swartz - WA6HHQ

Re: Reliable DC Power Supply for K3/P3

Administrator

In reply to this post by Phil Hystad-3

Let's end this thread for now. Its a repeat of one that just ran recently and
can easily be found in the archives at http://www.elecraft.com/elist.html .

It is near at the max posting in a short period limit for a single topic.

73,

Eric
List Moderator
elecraft.com

On 11/19/2013 10:34 AM, Phil Hystad wrote:
> I use an RS-50M and yes it is indeed a real heavy tank. But, then again, it sits on the floor, it is not in the way at all, and it is on all the time (except when I am away from the house for more than a couple of days). I use it to feed a West Mountain Radio Rig Runner 8012. Perfect set up for my QTH.
>
>

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Fred Smith-2

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Josh Fiden

I have 2 70 amp supplies a VS and a RS and a RS-12 plus a Samlex 1223/1235M
also an MFJ QRP supply for the FT-817 that is used on the road with my KX3.

73,
Fred/N0AZZ
K3 Ser # 6730--KX3 # 5210--K2/100 # 6470-KAT100
P3/SVGA--KAT500--W2
Amps Elecraft KPA500 HF/6m--Alpha's 9500 HF--87A HF--Mirage B-5030-G
300+w--(2) B-5016-G's 165w 2m

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Josh Fiden
Sent: Tuesday, November 19, 2013 12:15 PM
To: [hidden email]
Subject: Re: [Elecraft] Reliable DC Power Supply for K3/P3

Hi Bob,

Just a note because the RS-50 is a real tank (heavy). I use 2x SS-30M which
power 5 high current devices (K3/P3, TS790A, IC910H and 2 brick amps). Each
power supply is only capable of powering one of these devices during
transmit, but since I don't transmit on multiple radios concurrently, that's
not a problem.

So, unless you need to transmit on the K3 and VHF radio at the same time,
you can get by with a smaller/lighter/cheaper supply. Of course nothing
wrong with overhead and room for expansion!

73,
Josh W6XU

On 11/19/2013 9:54 AM, Robert Nobis wrote:
> Everyone,
>
> Thank you. It looks like using an Astron supply is the way to go. I
> will probably go with the RS-50, as I also have a Yaesu 2M/70cm rig to
power.

>
> Incidentally, this mailing list was one of the major reasons why I
> decided to get the Elecraft K3/P3 instead of competing products made
> in Japan. I have found the members of this list quick to respond to
> questions from others, with great answers.
>
> Again, thank you.
>
> 73,
>
>
> Bob - N7RJN
>
>
>
> On 11/19/13, 7:35 AM, "Robert Nobis" <[hidden email]> wrote:
>
>> I m about ready to place an order for a K3 and P3, and wonder if
>> there are recommendations on a reliable DC power supply for the
>> Elecraft 100-W transceiver.
>>
>> 73,
>>
>> Bob - N7RJN
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html
>

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-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3426 / Virus Database: 3629/6846 - Release Date: 11/18/13

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Eugene Balinski

Re: Reliable DC Power Supply for K3/P3

In reply to this post by Hisashi T Fujinaka

The model number of an Astron PS is the PEAK supply
current. An RS-35M is a 35A PEAK, 25A Continuous supply.
The RS-20 is 20 peak, 16 continuous

http://www.astroncorp.com/showpage.asp?p=2

73
Gene K1NR

On Tue, 19 Nov 2013 08:33:51 -0800 (PST)
Hisashi T Fujinaka <[hidden email]> wrote:

> The only thing that bit me: Astron XX does not mean XX
> amps. I have an
> Astron 25M and I was trying to figure out why my K2/100
> would power off
> on 15M at 100W when I finally figured out that that the
> Astron 25 is a
> 20 amp power supply and my K2 needed a bit more. It would
> even fold
> back the voltage. After more debugging (and lots of
> bypass caps &
> chokes and dummy loads and a brand new oscilloscope) and
> I found that RF
> in the shack could be part of the problem but just
> swapping to an Astron
> 35M was my fix.
>
> Unfortunately, the Astron puts out a lot of heat, and my
> shack happens
> to be in a room that gets pretty warm even with the A/C
> on. So I changed
> to a 25A switching power supply which unfortunately has a
> fan. Now the
> tradeoff is heat vs. fan.
>
> On Tue, 19 Nov 2013, Don Wilhelm wrote:
>
> > Bob,
> >
> > The old reliable Astron 35 is a very good linear supply
> - I do not have the
> > metered version, and mine sits quietly on the floor
> under the desk, no need
> > to look at meters there.
> >
> > I also have an Astron SS30 which does a great job at
> the workbench. Again no
> > need for meters, and even though a switcher, I have not
> found any switching
> > noise created in the ham bands.
> >
> > As backups, I have an MFJ 25 amp switching supply and
> an Alinco 340M linear -
> > the advantages of those supplies is that the output
> voltage is front panel
> > adjustable. No noticeable noise from the switcher and
> the current is more
> > than sufficient for the K3/100.
> >
> > If you have other accessories, you might want to look
> at a 35 amp supply, but
> > 20 or 25 amps is all that is needed for the K3.
> >
> > 73,
> > Don W3FPR
> >
> > On 11/19/2013 9:35 AM, Robert Nobis wrote:
> >> I m about ready to place an order for a K3 and P3, and
> wonder if there are
> >> recommendations on a reliable DC power supply for the
> Elecraft 100-W
> >> transceiver.
> >>
> >> 73,
> >>
> >> Bob - N7RJN
> >>
> >>
> >>
>

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>

______________________________________________________________

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>
> --
> Hisashi T Fujinaka - [hidden email]
> BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03)
> + $2.50 = latte
>

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>
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