Elecraft

New 30A power supply on Elecraft order form

Classic

List

Threaded

22 messages Options

dhhdeh

New 30A power supply on Elecraft order form

Check out the 25 eHam reviews.

It's not without issues for some reviewers.

Mostly RFI on some HF bands and fan noise.

______________________________________________________________
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
Message delivered to [hidden email]

wayne burdick

Re: New 30A power supply on Elecraft order form

Administrator

We've had very good results using this supply ourselves. That said, results with switching supplies can vary with type of antenna feed. For example, I wouldn't use a switcher if you have no choice but to use an random wire leading directly from window to rig. Good grounding can also help.

I'm not sure if a 100% noise-free 30-amp switcher has ever been designed. If it has, chances are it would be far more expensive than this one. But if you've found one, please let us know.

73,
Wayne
N6KR

On Apr 14, 2015, at 3:47 PM, David and Dianne on Comcast <[hidden email]> wrote:

> Check out the 25 eHam reviews.
>
> It's not without issues for some reviewers.
>
> Mostly RFI on some HF bands and fan noise.

______________________________________________________________
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
Message delivered to [hidden email]

Phil Hystad-3

Re: New 30A power supply on Elecraft order form

In reply to this post by dhhdeh

I have had no issues with my Powerwerx power supply. In fact, if I could afford the silliness of
it all, I would buy more just to have them stacked on my bookshelf for a rainy day — hey, I live in
Seattle and it is raining right now!

73, phil, K7PEH

> On Apr 14, 2015, at 3:47 PM, David and Dianne on Comcast <[hidden email]> wrote:
>
> Check out the 25 eHam reviews.
>
> It's not without issues for some reviewers.
>
> Mostly RFI on some HF bands and fan noise.
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

______________________________________________________________
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
Message delivered to [hidden email]

Merv Schweigert

Re: New 30A power supply on Elecraft order form

In reply to this post by wayne burdick

Wayne is totally correct, I have had most all of them and ZERO are
noise free,
my location has a very low noise level, S1-S2 and every switcher shows
a noise
rise on some band, or spurs on others.
A noise free one has not been invented, amen,

I have had to revert to linear supplies as I wish to hear signals at
S1.. a whole new
world there so to speak. the K3 is superb for hearing them with strong
signals very
close by,
Of course with a switcher you dont have to worry about that, you wont
hear them,
or if you live in town with a s4-s5 noise floor, sorry your out of luck.

73 Merv K9FD/kh6

> We've had very good results using this supply ourselves. That said, results with switching supplies can vary with type of antenna feed. For example, I wouldn't use a switcher if you have no choice but to use an random wire leading directly from window to rig. Good grounding can also help.
>
> I'm not sure if a 100% noise-free 30-amp switcher has ever been designed. If it has, chances are it would be far more expensive than this one. But if you've found one, please let us know.
>
> 73,
> Wayne
> N6KR
>
>
>
> On Apr 14, 2015, at 3:47 PM, David and Dianne on Comcast <[hidden email]> wrote:
>
>> Check out the 25 eHam reviews.
>>
>> It's not without issues for some reviewers.
>>
>> Mostly RFI on some HF bands and fan noise.
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
> .
>

Cortland Richmond-2

Re: New 30A power supply on Elecraft order form

In reply to this post by dhhdeh

On 14 Apr 2015 13:33:33, Jim, K9YC wrote:
> Indeed it is. RF quiet, too.
>
> 73, Jim K9YC
Some of the reviewers elsewhere have it quite noisy with nearby HF antennas.

http://www.eham.net/reviews/detail/9429

Cortland
KA5S
______________________________________________________________
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
Message delivered to [hidden email]

Phil Wheeler-2

Re: New 30A power supply on Elecraft order form

In reply to this post by wayne burdick

Wayne, I researched them a year ago and that's one
of the good ones.

I have an Astron SS-30-M which I bought back when
I started building my K2 in 1999. It's been very
quite and a great performer. And I like having meters!

Caveat: All my antennas here at home are coax fed :-)

Phil W7OX

On 4/14/15 3:57 PM, Wayne Burdick wrote:

Gary Gregory-2

Re: New 30A power supply on Elecraft order form

I dont put much, if any stock, in eham reviews.

When PowerWerx first released them i got 2 and never had an issue and those
here who followed my lead have also had zero RFI or failures.

It cracks me uo when a review starts off with silly things like "just got
my new rig and had a qso with my buddy and he said i sounded great....best
rig i have ever owned"

That sort of quality review just makes me hug my k3.....again....

TIC.....

Back to snoozing.

Gary
Vk1ZZ
K3, KPA500-FT, KAT500-FT
On 15/04/2015 11:12 AM, "Phil Wheeler" <[hidden email]> wrote:

> Wayne, I researched them a year ago and that's one of the good ones.
>
> I have an Astron SS-30-M which I bought back when I started building my K2
> in 1999. It's been very quite and a great performer. And I like having
> meters!
>
> Caveat: All my antennas here at home are coax fed :-)
>
> Phil W7OX
>
> On 4/14/15 3:57 PM, Wayne Burdick wrote:
>
>> We've had very good results using this supply ourselves. That said,
>> results with switching supplies can vary with type of antenna feed. For
>> example, I wouldn't use a switcher if you have no choice but to use an
>> random wire leading directly from window to rig. Good grounding can also
>> help.
>>
>> I'm not sure if a 100% noise-free 30-amp switcher has ever been designed.
>> If it has, chances are it would be far more expensive than this one. But if
>> you've found one, please let us know.
>>
>> 73,
>> Wayne
>> N6KR
>>
>>
>>
>> On Apr 14, 2015, at 3:47 PM, David and Dianne on Comcast <
>> [hidden email]> wrote:
>>
>> Check out the 25 eHam reviews.
>>>
>>> It's not without issues for some reviewers.
>>>
>>> Mostly RFI on some HF bands and fan noise.
>>>
>>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

Sverre Holm (LA3ZA)

Re: New 30A power supply on Elecraft order form

In reply to this post by wayne burdick

I'm sure it is right that no switcher is 100% noise-free. But some of them have a means to change the switch frequency. That could be a way to help out, if the noise happens to fall on a particularly interesting frequency.

I have two of them, one is an Alinco DM-330MV (32 Amps) and another is an unknown-brand Chinese one. I have only had to use this feature on 160m. I have ladder line directly into the shack, so I may more sensitive to this kind of noise than if I had a coax feed.

wayne burdick wrote

I'm not sure if a 100% noise-free 30-amp switcher has ever been designed. If it has, chances are it would be far more expensive than this one. But if you've found one, please let us know.

Sverre, LA3ZA

K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html

David Orman

Re: New 30A power supply on Elecraft order form

Having the Alinco DM-330FX, and the PX3, one thing I want to make sure
people understand is do not expect a 'clean' panadapter display with one of
these Alinco PSUs. You can definitely shift the noise out of a SSB
transmission, for example, but you'll still see it on the display. It was
frustrating enough to me I picked up a linear PSU so spotting signals on
the PX3 wasn't as much of a challenge. Not sure how this other PSU compares
in this regard - but it's something to consider - perhaps someone with the
PSU Elecraft is selling can chime in regarding this.

On Wed, Apr 15, 2015 at 4:18 AM, Sverre Holm (LA3ZA) <[hidden email]> wrote:

> I'm sure it is right that no switcher is 100% noise-free. But some of them
> have a means to change the switch frequency. That could be a way to help
> out, if the noise happens to fall on a particularly interesting frequency.
>
> I have two of them, one is an Alinco DM-330MV (32 Amps) and another is an
> unknown-brand Chinese one. I have only had to use this feature on 160m. I
> have ladder line directly into the shack, so I may more sensitive to this
> kind of noise than if I had a coax feed.
>
>
> wayne burdick wrote
> > I'm not sure if a 100% noise-free 30-amp switcher has ever been designed.
> > If it has, chances are it would be far more expensive than this one. But
> > if you've found one, please let us know.
>
>
>
>
>
> -----
> Sverre, LA3ZA
>
> K2 #2198, K3 #3391,
> LA3ZA Blog: http://la3za.blogspot.com,
> LA3ZA Unofficial Guide to K2 modifications:
> http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/New-30A-power-supply-on-Elecraft-order-form-tp7601353p7601367.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

Johnny Siu

New 30A power supply on Elecraft order form

Hello David,
Pretty much the opposite, I am using an Alinco DM-330MVE. It is quiet and I see nothing on the P3.
While there are merits of using linear power supply, in practice, many telecommunication equipment in both commercial and miltrary sectors are using switching power supplies.
Clearly, quiet switching PSU is fairly expensive but it does not mean any rocket science.
I have already given up linear power supply except the KPA500 is still using linear transformer.
73
Johnny VR2XMC

寄件人︰ David Orman <[hidden email]>
收件人︰
副本(CC)︰ Elecraft Reflector <[hidden email]>
傳送日期︰ 2015年04月15日 (週三) 7:51 PM
主題︰ Re: [Elecraft] New 30A power supply on Elecraft order form

Having the Alinco DM-330FX, and the PX3, one thing I want to make sure
people understand is do not expect a 'clean' panadapter display with one of
these Alinco PSUs. You can definitely shift the noise out of a SSB
transmission, for example, but you'll still see it on the display. It was
frustrating enough to me I picked up a linear PSU so spotting signals on
the PX3 wasn't as much of a challenge. Not sure how this other PSU compares
in this regard - but it's something to consider - perhaps someone with the
PSU Elecraft is selling can chime in regarding this.

On Wed, Apr 15, 2015 at 4:18 AM, Sverre Holm (LA3ZA) <[hidden email]> wrote:

Edward R Cole

Re: New 30A power supply on Elecraft order form

In reply to this post by dhhdeh

This switching supply may solve a power issue for me without being
huge and heavy.

My concern would be RFI at 144-MHz and higher as my application is
supplying two 60w linear amplifiers (class-A) that operate on 3.4
GHz. Each needs 20A continuous supply, so two PS will be needed. I
don't care about fan noise as they will be installed on my dish
100-feet from the shack. I plan to switch the dc on/off to the
amplifiers in Tx/Rx to minimize heat dissipation (240w each). Amps
will have super heat-sinks with fans running continuous. I probably
will run ac to the PS to have short dc lines (maybe I will run RG-59
to shield the dc).

Do the back connectors thread all the way off for installing ring
connectors? Some banana type do not forcing the use of a 1/4-inch
spade vs ring. I would likely replace the banana with 1/4-inch nuts,
locks, flat washers.

I read some of the eHam reviews and there were several about HF RFI
but most seem to note nothing at VHF. I will be running 144-MHz via
coax to the dish where the transverter will be located.

One question is how low voltage can be adjusted. Amps are designed
for 12.0 volts.

This looks like a nice package for portable use with K3/100.

73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[hidden email]

______________________________________________________________
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
Message delivered to [hidden email]

wayne burdick

Re: New 30A power supply on Elecraft order form

Administrator

On Apr 15, 2015, at 7:48 AM, Edward R Cole <[hidden email]> wrote:

> One question is how low voltage can be adjusted. Amps are designed for 12.0 volts.

Ed,

All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.

73,
Wayne
N6KR

______________________________________________________________
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
Message delivered to [hidden email]

Ross Primrose

Re: New 30A power supply on Elecraft order form

He was talking about his 3.4GHz amps being designed for 12V....

73, Ross N4RP

On 4/15/2015 11:37 AM, Wayne Burdick wrote:

> On Apr 15, 2015, at 7:48 AM, Edward R Cole <[hidden email]> wrote:
>
>> One question is how low voltage can be adjusted. Amps are designed for 12.0 volts.
> Ed,
>
> All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.
>
> 73,
> Wayne
> N6KR
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

______________________________________________________________
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
Message delivered to [hidden email]

wayne burdick

Re: New 30A power supply on Elecraft order form

Administrator

Where's my coffee!?

On Apr 15, 2015, at 8:53 AM, Ross Primrose <[hidden email]> wrote:

> He was talking about his 3.4GHz amps being designed for 12V....
>
> 73, Ross N4RP
>
> On 4/15/2015 11:37 AM, Wayne Burdick wrote:
>> On Apr 15, 2015, at 7:48 AM, Edward R Cole <[hidden email]> wrote:
>>
>>> One question is how low voltage can be adjusted. Amps are designed for 12.0 volts.
>> Ed,
>>
>> All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.
>>
>> 73,
>> Wayne
>> N6KR

David Inger-2

Re: New 30A power supply on Elecraft order form

In reply to this post by dhhdeh

I found this PS very noisy when used portable with the antenna less than 30
ft away. Birdies (or whatever is the appropriate term) where generated all
across the spectrum from 80-10 meters. It was so bad I found the PS
unusable. When I switched to my Samlec 1235, I had no problems.

It seems that switch mode power supplies vary in RFI. I know of people whol
find the Samlec noisy; mine isn't. There may be unit-to-unit variations,
due to small differences in components.

I would recommend that anyone interested in this PS should try to use one in
their specific situation . The Powerwerx unit was quiet on my home station
(antennas are 100 ft. away from the supply), but totally useless for me
when used for "vacation portable."

73 de K6SBA
David in Santa Barbara, CA

______________________________________________________________
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
Message delivered to [hidden email]

Elecraft mailing list

Re: New 30A power supply on Elecraft order form

In reply to this post by wayne burdick

Hello Wayne,
Will you be updating page 8 of the Owner's Manual to reflect this change? The OM says 13.8v and nothing about measuring it at the DC jack on key-down. However that sounds like a fun experiment.
73,MichaelKK6RWNnew K3 owner serial 8989
From: Wayne Burdick <[hidden email]>
To: Edward R Cole <[hidden email]>
Cc: [hidden email]
Sent: Wednesday, April 15, 2015 8:37 AM
Subject: Re: [Elecraft] New 30A power supply on Elecraft order form

On Apr 15, 2015, at 7:48 AM, Edward R Cole <[hidden email]> wrote:

> One question is how low voltage can be adjusted. Amps are designed for 12.0 volts.

Ed,

All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.

73,
Wayne
N6KR

______________________________________________________________
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
Message delivered to [hidden email]

______________________________________________________________
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
Message delivered to [hidden email]

Fred Townsend-2

Re: New 30A power supply on Elecraft order form

In reply to this post by David Inger-2

David, it sounds like your power supply may have been defective. RFI is a
function of many factors but the amount of current

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of David
Inger
Sent: Wednesday, April 15, 2015 9:47 AM
To: [hidden email]
Subject: Re: [Elecraft] New 30A power supply on Elecraft order form

I found this PS very noisy when used portable with the antenna less than 30
ft away. Birdies (or whatever is the appropriate term) where generated all
across the spectrum from 80-10 meters. It was so bad I found the PS
unusable. When I switched to my Samlec 1235, I had no problems.

It seems that switch mode power supplies vary in RFI. I know of people whol
find the Samlec noisy; mine isn't. There may be unit-to-unit variations,
due to small differences in components.

I would recommend that anyone interested in this PS should try to use one in
their specific situation . The Powerwerx unit was quiet on my home station
(antennas are 100 ft. away from the supply), but totally useless for me when
used for "vacation portable."

73 de K6SBA
David in Santa Barbara, CA

______________________________________________________________
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 Message
delivered to [hidden email]

______________________________________________________________
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
Message delivered to [hidden email]

Raymond Sills

Re: New 30A power supply on Elecraft order form

In reply to this post by David Orman

Hi Gang:

Well, all this discussion regarding switching vs linear power supplies
makes me glad I'm a QRP guy. My power supplies are -pure- DC.
Batteries. No spurs, birdies, noise or whatever from chemical DC.
Just power. :)

73 de Ray
K2ULR
KX3 #211

______________________________________________________________
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
Message delivered to [hidden email]

wayne burdick

Re: New 30A power supply on Elecraft order form

Administrator

In reply to this post by Elecraft mailing list

13.8 is fine. I said "about 14" so I wouldn't have to think too hard so early in the morning.

Wayne

On Apr 15, 2015, at 10:03 AM, Michael Gillen <[hidden email]> wrote:

> Hello Wayne,
>
> Will you be updating page 8 of the Owner's Manual to reflect this change? The OM says 13.8v and nothing about measuring it at the DC jack on key-down. However that sounds like a fun experiment.
>
> 73,
> Michael
> KK6RWN
> new K3 owner serial 8989
>
> From: Wayne Burdick <[hidden email]>
> To: Edward R Cole <[hidden email]>
> Cc: [hidden email]
> Sent: Wednesday, April 15, 2015 8:37 AM
> Subject: Re: [Elecraft] New 30A power supply on Elecraft order form
>
>
> On Apr 15, 2015, at 7:48 AM, Edward R Cole <[hidden email]> wrote:
>
> > One question is how low voltage can be adjusted. Amps are designed for 12.0 volts.
>
> Ed,
>
> All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.
>
> 73,
> Wayne
> N6KR
>
>
>
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>
>

Dominic Baines-3

Re: New 30A power supply on Elecraft order form

In reply to this post by wayne burdick

I would have thought easy to measure the load/no load voltages....

Is that also measured 14.0-14.2V at the equipment DC input or is that to
assume no or some voltage drop on feeder cables from the PSU etc? Quick
calculation for 22A of feeder say a 1m twin 6mm2 cable will show c 0.23V
drop over a meter (smaller cable bigger voltage drop and vica versa) so
if 14.2V at PSU and 22A (100W) 'should' be about 14V at kit if using
large enough feeder cable ... just asking.

Also as qrp bit of an oxymoron talking about 30A psu, unless it is for
the lighting and AC maybe hihi.

72

Dom
M1KTA

On 15/04/15 17:14, Wayne Burdick wrote:
>>> All Elecraft 100-W amplifiers are designed for optimal performance at about 14 V (as measured at the DC jack on key-down). This includes the K3's and K2's internal 100-W amps as well as the KXPA100. They will certainly run from lower voltages -- down to about 10.5 to 11 V -- but for home use, we recommend setting the DC supply to 14.0-14.2 V. They'll run from as high as 15 V, though again, around 14 V optimizes power output, IMD levels, and efficiency.
>>> >>
>>> >>73,
>>> >>Wayne
>>> >>N6KR

______________________________________________________________
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
Message delivered to [hidden email]