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K3 on Order

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Chris W7CTH

K3 on Order

Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM filter,6m
preamp.
Any recommendation on a power supply?

Chris W7CTH

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Mike Reublin

Re: K3 on Order

Welcome to the family.
I'm using an Astron RS-35M, it's what I had. I found I had to set the output to 13.8V
for the K3 to operate correctly.

73, Mike NF4L

On 7/15/2010 6:39 PM, Chris Hembree wrote:

> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM filter,6m
> preamp.
> Any recommendation on a power supply?
>
> Chris W7CTH
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
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Don Cunningham

Re: K3 on Order

In reply to this post by Chris W7CTH

Hey, congratulations, Chris. I know you will enjoy the rig. I use an
Astron RS-50M with mine, but that's extreme overkill. I just had it on
hand. One of the Elecraft co-owners (memory doesn't tell me which) uses the
Samlex 1223 I believe. I've looked at the 30 amp version of that, and the
price is tempting, for sure, and I like the light weight instead of this 30
lb monster I have, hi.
73,
Don, WB5HAK
----- Original Message -----
From: "Chris Hembree" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, July 15, 2010 5:39 PM
Subject: [Elecraft] K3 on Order

> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM
> filter,6m
> preamp.
> Any recommendation on a power supply?
>
> Chris W7CTH
>
>
>
>
> ______________________________________________________________
> 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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13:35:00

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Dunc Carter - W5DC

Re: K3 on Order

In reply to this post by Chris W7CTH

I bought an MFJ 4125P a few days before I received my K3 so I would have
something that would work and would be easily portable and with the
intention of buying a power supply for non-portable use later, which I
haven't done yet. The MFJ 4125P is somewhat, but not terribly noisy.
In my case, significant hearing damage probably but I also place it
behind a monitor.

Dunc, W5DC

Chris Hembree wrote:

wayne burdick

Re: K3 on Order

Administrator

In reply to this post by Chris W7CTH

Hi Chris,

Hope you enjoy your K3.

One thought: If you operate any CW or narrowband data at all, I think
you'll want at least one narrow filter (500 or 400 Hz). It'll make a
huge difference in crowded band conditions. If you're strictly into
voice modes, you can do without.

73,
Wayne
N6KR

On Jul 15, 2010, at 3:39 PM, Chris Hembree wrote:

> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM
> filter,6m
> preamp.
> Any recommendation on a power supply?
>
> Chris W7CTH
>
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Carl Griebno - KC4SG

Re: K3 on Order

In reply to this post by Chris W7CTH

On Thu, 15 Jul 2010 18:39:20 -0400, Chris Hembree <[hidden email]> wrote:

> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM
> filter,6m
> preamp.
> Any recommendation on a power supply?
>
> Chris W7CTH

Yup ...... I'd get something around 13.8V - 30A surge :p

All kidding aside, pick the one you like. Almost all are good. Check out
the August 2009 issue of QST and Best of luck with your new K3 !!
>
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Dave LaBat

Re: K3 on Order

In reply to this post by Chris W7CTH

I have used a bunch of different supplies, all worked well. Use an Alinco
switching 35 amp supply for portable work, an Astron 20 amp up at the cabin
and a Lambda arc welder supply :) for home use

73 Dave NT6AA
----- Original Message -----
From: "Chris Hembree" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, July 15, 2010 3:39 PM
Subject: [Elecraft] K3 on Order

Pete Smith N4ZR

Re: K3 on Order

In reply to this post by Don Cunningham

I got the Samlex 1235M, and have been very happy wioth it (the 35 amps
gives more than adequate headroom for the K3, without being silly). The
one drawback is the rather loud fan which comes on after heavy
transmitting, but AD5X has a modification (and an excellent review of
the PS) on his web site, which lets the fan run slowly almost all the
time, and the top speed only rarely.

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com,
spots at telnet.reversebeacon.net, port 7000

On 7/15/2010 6:58 PM, Don Cunningham wrote:

> Hey, congratulations, Chris. I know you will enjoy the rig. I use an
> Astron RS-50M with mine, but that's extreme overkill. I just had it on
> hand. One of the Elecraft co-owners (memory doesn't tell me which) uses the
> Samlex 1223 I believe. I've looked at the 30 amp version of that, and the
> price is tempting, for sure, and I like the light weight instead of this 30
> lb monster I have, hi.
> 73,
> Don, WB5HAK
> ----- Original Message -----
> From: "Chris Hembree"<[hidden email]>
> To:<[hidden email]>
> Sent: Thursday, July 15, 2010 5:39 PM
> Subject: [Elecraft] K3 on Order
>
>
>
>> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM
>> filter,6m
>> preamp.
>> Any recommendation on a power supply?
>>
>> Chris W7CTH
>>
>>
>>
>>
>> ______________________________________________________________
>> 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
>>
>>
>
> --------------------------------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.839 / Virus Database: 271.1.1/3008 - Release Date: 07/15/10
> 13:35:00
>
> ______________________________________________________________
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>
>

Eugene Balinski

Re: K3 on Order

In reply to this post by Chris W7CTH

Astron RS-35M

Linear (no noise) with meter. Last 12V supply you will
need. Build an Anderson supply cable. Use a "Red-Dee 2
Connect" 8 way Anderson distribution
block

http://www.reddee2.com/

Much less expensive than the others and they work well.

73
K1NR

K2 Sn 6K

On Thu, 15 Jul 2010 15:39:20 -0700 (PDT)
Chris Hembree <[hidden email]> wrote:

> Well I took the BIG plunge today, K3/100, 2.8 up Grade
> filter, FM filter,6m
> preamp.
> Any recommendation on a power supply?
>
> Chris W7CTH
>
>
>
>
>

______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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Larry 'Rebar' Rebarchik - N6CCH

Re: K3 on Order

In reply to this post by Pete Smith N4ZR

You may also want to look at the solid-state PS from http://Power-werx.com
model=SS-30.
I picked up one in a raffle and it powers the K3 just fine with a very
small footprint, two power poles in the front and a pair of terminals in
the back.
I have not tried to use it to float charge a battery and the Mfg. was not
clear if it would work in this application.
It has a fan that makes some noise.

rebar

On Fri, 16 Jul 2010 06:07:53 -0400, Pete Smith <[hidden email]>
wrote:
> I got the Samlex 1235M, and have been very happy wioth it (the 35 amps
> gives more than adequate headroom for the K3, without being silly). The

> one drawback is the rather loud fan which comes on after heavy
> transmitting, but AD5X has a modification (and an excellent review of
> the PS) on his web site, which lets the fan run slowly almost all the
> time, and the top speed only rarely.
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com,
> spots at telnet.reversebeacon.net, port 7000
>
>
> On 7/15/2010 6:58 PM, Don Cunningham wrote:
>> Hey, congratulations, Chris. I know you will enjoy the rig. I use an
>> Astron RS-50M with mine, but that's extreme overkill. I just had it on
>> hand. One of the Elecraft co-owners (memory doesn't tell me which)

uses
>> the
>> Samlex 1223 I believe. I've looked at the 30 amp version of that, and
>> the
>> price is tempting, for sure, and I like the light weight instead of
this

>> 30
>> lb monster I have, hi.
>> 73,
>> Don, WB5HAK
>> ----- Original Message -----
>> From: "Chris Hembree"<[hidden email]>
>> To:<[hidden email]>
>> Sent: Thursday, July 15, 2010 5:39 PM
>> Subject: [Elecraft] K3 on Order
>>
>>
>>
>>> Well I took the BIG plunge today, K3/100, 2.8 up Grade filter, FM
>>> filter,6m
>>> preamp.
>>> Any recommendation on a power supply?
>>>
>>> Chris W7CTH
>>>
>>>
>>>
>>>
>>> ______________________________________________________________
>>> 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
>>>
>>>
>>
>>

--------------------------------------------------------------------------------
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com
>> Version: 9.0.839 / Virus Database: 271.1.1/3008 - Release Date:
07/15/10

>> 13:35:00
>>
>> ______________________________________________________________
>> Elecraft mailing list
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>> Post: mailto:[hidden email]
>>
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>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>>
> ______________________________________________________________
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--
73 de N6CCH aka Rebar
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Joe Subich, W4TV-4

Re: K3 on Order

In reply to this post by Eugene Balinski

While I can't disagree with the recommendation for a linear
supply (I have an Astron RS-35A for each K3), I recommend
avoiding the PowerPole distribution blocks and would power
station accessories - particularly any accessory that touches
the audio - in the shack from a SEPARATE supply.

Sharing a single power supply between the transmitter and
accessories is a very good way to create "RFI" (even with
a dummy load) due to the "pin 1" problem in nearly every
amateur rig ever built.

Both K9YC and W8JI have documented various manifestations of
this problem - common mode RFI, "ground loops," "hum loops,"
and current modulation of external audio sources. For many
years, Kenwood manuals have specifically cautioned against
using the same power supply for their transceivers and "data
TNCs" even though their explanation ("conducted noise from
the TNC") is not correct. For a better understanding of
these issues I recommend the web sites of K9YC and W8JI.

K9YC: http://www.audiosystemsgroup.com/RFIHamNCCC.pdf
W8JI: http://www.w8ji.com/cables_and_wiring.htm

73,

... Joe, W4TV

On 7/16/2010 9:55 AM, Eugene Balinski wrote:

> Astron RS-35M
>
> Linear (no noise) with meter. Last 12V supply you will
> need. Build an Anderson supply cable. Use a "Red-Dee 2
> Connect" 8 way Anderson distribution
> block
>
> http://www.reddee2.com/
>
> Much less expensive than the others and they work well.
>
> 73
> K1NR
>
> K2 Sn 6K
>
>
>
>
>
>
> On Thu, 15 Jul 2010 15:39:20 -0700 (PDT)
> Chris Hembree<[hidden email]> wrote:
>> Well I took the BIG plunge today, K3/100, 2.8 up Grade
>> filter, FM filter,6m
>> preamp.
>> Any recommendation on a power supply?
>>
>> Chris W7CTH
>>
>>
>>
>>
>>
> ______________________________________________________________
>> 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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> http://www.nni.com/
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P.B. Christensen

Re: K3 on Order

> Sharing a single power supply between the transmitter and
> accessories is a very good way to create "RFI" (even with
> a dummy load) due to the "pin 1" problem in nearly every
> amateur rig ever built.

I completely agree with Joe, but I'm guilty of using a common supply for the
K3 and switching-type accessories.

However, if a common supply is used with a distribution block, consider
connecting the K3 direct to the power supply terminals and not a port on the
distribution block. Then, if a power distribution block is used, route
accessories from the power supply terminals to the block, especially if one
is insistent on running audio accessories from the +12V bus.

The W2IHY products can be powered by +12V and seem to be very popular. When
using a W2IHY device, it would be better to use the supplied wall-wart than
be tempted to use a common +12V power bus. If I was designing a similar
device, I would rather design it for use with an AC wall transformer (AC
in/out), then rectify and filter inside the audio device. The added benefit
is that bi-polar supply rails can be easily created with an AC input.

Paul, W9AC.

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Brett Howard

Re: K3 on Order

The main reason why most devices take DC in rather than bringing in
direct AC is because they can pass all the safety work on to the brick
manufacturer and it saves them a lot of money in the regulatory end.

~Brett (N7MG)

On Fri, Jul 16, 2010 at 9:08 AM, Paul Christensen <[hidden email]> wrote:

>> Sharing a single power supply between the transmitter and
>> accessories is a very good way to create "RFI" (even with
>> a dummy load) due to the "pin 1" problem in nearly every
>> amateur rig ever built.
>
> I completely agree with Joe, but I'm guilty of using a common supply for the
> K3 and switching-type accessories.
>
> However, if a common supply is used with a distribution block, consider
> connecting the K3 direct to the power supply terminals and not a port on the
> distribution block. Then, if a power distribution block is used, route
> accessories from the power supply terminals to the block, especially if one
> is insistent on running audio accessories from the +12V bus.
>
> The W2IHY products can be powered by +12V and seem to be very popular. When
> using a W2IHY device, it would be better to use the supplied wall-wart than
> be tempted to use a common +12V power bus. If I was designing a similar
> device, I would rather design it for use with an AC wall transformer (AC
> in/out), then rectify and filter inside the audio device. The added benefit
> is that bi-polar supply rails can be easily created with an AC input.
>
> Paul, W9AC.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Chris W7CTH

Re: K3 on Order

In reply to this post by Larry 'Rebar' Rebarchik - N6CCH

I did not know about the Power-werx SS-30DV. I will look into this one as well.I
would very much like a switching supply. Because I don't have a normal Ham
shack. I use my home office as the radio room with not much room for radio's.

My concern for any Switching supply is the RFI noice that the radio will pick up
from the power supply. Looking at the SEC 1235m, I was reading that it has a
build in RFI filter. Plus I like the AD5X mod to slow down the fan. And the
Alinco DM-340 MVT has a knob to change the freq. of the noise that the radio is
picking up. I think that the DM-340 MVT is a bit over kill. I am only looking
for a PS that will power the radio only.

Chris W7CTH

________________________________
From: Larry 'Rebar' Rebarchik - N6CCH <[hidden email]>
To: [hidden email]
Cc: Don Cunningham <[hidden email]>; [hidden email]; Chris
Hembree <[hidden email]>
Sent: Fri, July 16, 2010 8:52:51 AM
Subject: Re: [Elecraft] K3 on Order

You may also want to look at the solid-state PS from http://Power-werx.com
model=SS-30.
I picked up one in a raffle and it powers the K3 just fine with a very
small footprint, two power poles in the front and a pair of terminals in
the back.
I have not tried to use it to float charge a battery and the Mfg. was not
clear if it would work in this application.
It has a fan that makes some noise.

rebar

On Fri, 16 Jul 2010 06:07:53 -0400, Pete Smith <[hidden email]>
wrote:
> I got the Samlex 1235M, and have been very happy wioth it (the 35 amps
> gives more than adequate headroom for the K3, without being silly). The

uses
>> the
>> Samlex 1223 I believe. I've looked at the 30 amp version of that, and
>> the
>> price is tempting, for sure, and I like the light weight instead of
this

--
73 de N6CCH aka Rebar

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Don Wilhelm-4

Re: K3 on Order

Chris,

You say, not much room - how about a linear supply on the floor under
the desk? It does not take up much space there. None of my power
supplies occupy desk space.

73,
Don W3FPR

Chris Hembree wrote:
> I did not know about the Power-werx SS-30DV. I will look into this one as well.I
> would very much like a switching supply. Because I don't have a normal Ham
> shack. I use my home office as the radio room with not much room for radio's.
>
>
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W8JI

Re: K3 on Order

In reply to this post by Chris W7CTH

> My concern for any Switching supply is the RFI noice that the radio will
> pick up
> from the power supply. Looking at the SEC 1235m, I was reading that it has
> a
> build in RFI filter. Plus I like the AD5X mod to slow down the fan. And
> the
> Alinco DM-340 MVT has a knob to change the freq. of the noise that the
> radio is
> picking up.

Any power supply that has a VFO knob built in means they either don't know
how to get harmonics down to the proper level or don't want to spend a few
bucks on components, so they took the cheap way out.

I have several switching supplies and can't hear any of them anywhere unless
I run an antenna right in the room.

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Will - AI4VE

Re: K3 on Order

In reply to this post by Chris W7CTH

I bought a PowerWerx SS-30 at Dayton this year and used it at Field Day. It powered my K3 for the entire 24 hours without any problem. No RF noise detected. The fan noise is noticeable but not with headphones. Several people commented on it's small size. Now I use it in the shack as my main power supply since it takes up so little space on the desk.
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Bob Nielsen-2

Re: K3 on Order

In reply to this post by W8JI

On Jul 16, 2010, at 5:35 PM, Tom W8JI wrote:

>> My concern for any Switching supply is the RFI noice that the
>> radio will
>> pick up
>> from the power supply. Looking at the SEC 1235m, I was reading
>> that it has
>> a
>> build in RFI filter. Plus I like the AD5X mod to slow down the
>> fan. And
>> the
>> Alinco DM-340 MVT has a knob to change the freq. of the noise that
>> the
>> radio is
>> picking up.
>
> Any power supply that has a VFO knob built in means they either
> don't know
> how to get harmonics down to the proper level or don't want to
> spend a few
> bucks on components, so they took the cheap way out.
>
> I have several switching supplies and can't hear any of them
> anywhere unless
> I run an antenna right in the room.

I have an Alinco supply and have never found any birdies which could
be changed by that knob, so I feel that it is pretty clean. After
fighting some of the birds I did have for years, I switched from a
CRT to a LCD monitor and nearly all the birds disappeared.

Bob, N7XY

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Chris W7CTH

Re: K3 on Order

In reply to this post by W8JI

Very good Point..
What switching supply's are you using?
Thanks
Chris

________________________________
From: Tom W8JI <[hidden email]>
To: Chris Hembree <[hidden email]>; Larry 'Rebar' Rebarchik - N6CCH
<[hidden email]>; [hidden email]
Cc: [hidden email]
Sent: Fri, July 16, 2010 6:35:06 PM
Subject: Re: [Elecraft] K3 on Order

> My concern for any Switching supply is the RFI noice that the radio will pick
>up
> from the power supply. Looking at the SEC 1235m, I was reading that it has a
> build in RFI filter. Plus I like the AD5X mod to slow down the fan. And the
> Alinco DM-340 MVT has a knob to change the freq. of the noise that the radio
is
> picking up.

Any power supply that has a VFO knob built in means they either don't know how
to get harmonics down to the proper level or don't want to spend a few bucks on
components, so they took the cheap way out.

I have several switching supplies and can't hear any of them anywhere unless I
run an antenna right in the room.

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Re: K3 on Order

Chris, I have two JetStream switching supplies that I have used for four years.
I have not been able to attribute any spurious receiver responses to the supply
in either my TS-850 or my Elecraft K3. I have a few continuous carriers that
seem to be spurious on 10 meters and 6 meters, but they are very weak, less than
S1 and I have never lost a contact that I blame these signals. I read a lot of
comments about the power supply generated artifacts, but I have not seen any
that properly documented a serious problem with any commerically offered
supply. One of my JetStreams does have some fan noise that I can hear when my
air conditioner is not running and my amplifier is turned off. I would
categorically say that there is a lot more worry about switching supplies than
the actual problems warrent. I am sure that there are many who will not be
convinced, but I have worked over 200 countries per year for the last four years
while using switching supplies and I have an Astron analog supply sitting on the
shelf that I don't use as well as a Pyramid analog supply that needs repair in
the closet.

Willis 'Cookie' Cooke
K5EWJ

________________________________
From: Chris Hembree <[hidden email]>
To: Tom W8JI <[hidden email]>; Larry 'Rebar' Rebarchik - N6CCH
<[hidden email]>; [hidden email]
Cc: [hidden email]
Sent: Fri, July 16, 2010 9:08:36 PM
Subject: Re: [Elecraft] K3 on Order

Very good Point..
What switching supply's are you using?
Thanks
Chris

________________________________
From: Tom W8JI <[hidden email]>
To: Chris Hembree <[hidden email]>; Larry 'Rebar' Rebarchik - N6CCH
<[hidden email]>; [hidden email]
Cc: [hidden email]
Sent: Fri, July 16, 2010 6:35:06 PM
Subject: Re: [Elecraft] K3 on Order

> My concern for any Switching supply is the RFI noice that the radio will pick
>up
> from the power supply. Looking at the SEC 1235m, I was reading that it has a
> build in RFI filter. Plus I like the AD5X mod to slow down the fan. And the
> Alinco DM-340 MVT has a knob to change the freq. of the noise that the radio
is
> picking up.

Any power supply that has a VFO knob built in means they either don't know how
to get harmonics down to the proper level or don't want to spend a few bucks on
components, so they took the cheap way out.

I have several switching supplies and can't hear any of them anywhere unless I
run an antenna right in the room.

______________________________________________________________
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______________________________________________________________
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