aa
From: Richard Fjeld rpfj...@embarqmail.com
To: elecraft@mailman.qth.net
Sent: Tuesday, 23 December 2014, 6:30
Subject: Re: [Elecraft] K3 13.8 VDC power
Well, more good information. Maybe I stand corrected. It's been nearly 4
...@btinternet.com
To: Richard Fjeld rpfj...@embarqmail.com; elecraft@mailman.qth.net
elecraft@mailman.qth.net
Sent: Friday, 26 December 2014, 9:07
Subject: Re: [Elecraft] K3 13.8 VDC power
aa
From: Richard Fjeld rpfj...@embarqmail.com
To: elecraft
Batteries are sensitive to their electrolyte temperature, some more than
others. If it is tempting to put batteries outside the shack for any
reason, take care of the temperature extremes they may experience in terms
of charge voltage etc. Inside a shack that is nice for us is also good for
Interesting presentation and I certainly understand the principal of
supply voltage vs IMD. There are some transmitters that I would not run
at 12vsome are worse than others. Im looking specifically at K3
performance as this is what I have, and as Don points out it is one of
if not the
My setup is charging a 33 AH AGM battery via a West Mountain Radio PowerGate
PG40S that feeds a distribution panel for the K3, P3 and other 12v
accessories. The power supply input to the PowerGate is a PowerWerx
SPS-30DM. The system can handle short power outages and keeps the battery
correctly
On Tue,12/23/2014 4:54 AM, david Moes wrote:
Interesting presentation and I certainly understand the principal of
supply voltage vs IMD. There are some transmitters that I would not
run at 12vsome are worse than others. Im looking specifically at
K3 performance as this is what I have,
It IS possible to send the K3 off to never-never land by removing the 12 volt
input before
shutting the radio off with the power switch. I've had it happen whilst mucking
around
behind my desk and accidentally pulling out the Anderson power-pole connector.
If you've saved the settings using
Thanks Roger, that information is rewarding.
Imagine what would happen if a power outage occurs during a firmware
upload. The odds are slim, but my middle name is 'Murphy'.
I want a good battery in my laptop as well. It has to finish the upload.
Dick, n0ce
On 12/23/2014 10:09 AM, Roger D
AM
Subject: Re: [Elecraft] K3 13.8 VDC power
It IS possible to send the K3 off to never-never land by removing the 12 volt
input before
shutting the radio off with the power switch. I've had it happen whilst mucking
around
behind my desk and accidentally pulling out the Anderson power-pole
Hi to the group
I have a K3 and a KX3 with PX3 and PA100. I always keep an up to date config
file on my computer. If I get an out of sequence power off I always restore the
config using the Elecraft utility. If I load new firmware I also restore the
good config. If I go to field day I make
RV's all contain power supplies that are designed to use 120 volts from
either generator or park power, to provide fifty-sixty-ish DC amperage to
the 12 volt (13.8) rails and house batteries around the RV. RV's run a
LOT of stuff on 13.8: fridge controls, Air Cond. controls, fans, furnace,
lights,
On Sun,12/21/2014 11:44 PM, Jim Brown wrote:
I run a contesting station with two K3s driving power amps with a 10A
supply keeping the battery charged during the winter, and solar panels
doing it during the summer.
Clarification: For the 2-radio contesting system, I use two 6V 210AH
Golf
On Dec 22, 2014, at 2:31 AM, Richard Fjeld rpfj...@embarqmail.com wrote:
Is anyone floating a battery across their power distribution?
Dick, n0ce
In almost every case possible. Uninterrupted communications is a very
important concept IMHO.
A trick (or maybe not) that I have recently
There are some cautions in floating a battery with a mains power
supply. For example, the ProAudio Engineering PAE-Kx33 4A
switching power supply I am using with my KX3 specifically says
not to use the power supply for directly charging batteries, and
voids the warranty if you do.
I had a
Jim Brown j...@audiosystemsgroup.com writes:
I run a contesting station with two K3s driving power amps with a 10A
supply keeping the battery charged during the winter, and solar panels
doing it during the summer.
What do you do about the voltage being 12.5ish instead of 13.8? Run the
K3s at
The SCC3 is in use here too. The basic 20 Amp unit can be scaled up
to higher rated amperage by adding additional FETs. The instructions
for this are included.
73,
matt
W6NIA
On Mon, 22 Dec 2014 06:49:49 -0800, you wrote:
There are some cautions in floating a battery with a mains power
On Mon,12/22/2014 7:05 AM, Greg Troxel wrote:
Jim Brown j...@audiosystemsgroup.com writes:
I run a contesting station with two K3s driving power amps with a 10A
supply keeping the battery charged during the winter, and solar panels
doing it during the summer.
What do you do about the voltage
Wow, thanks to all for the greatly informative answers. I gleaned many
good ideas from them.
This is my concern; I am interested in protecting my K3 from damage by
not being shut down properly should a power interruption occur while the
K3 is operating. For this design, I'm thinking about a
Dick,
Yes, hydrogen outgassing is a potential problem, and the area containing
a normal lead-acid battery should not only be protected from sparks and
ignition sources, but should also be vented to the outside.
I would suggest that you look at a larger gel cell or an AGM battery.
If you use
On Mon,12/22/2014 11:51 AM, Richard Fjeld wrote:
This is my concern; I am interested in protecting my K3 from damage by
not being shut down properly should a power interruption occur while
the K3 is operating. For this design, I'm thinking about a worst case
scenario; in transmit mode at 100
Another problem is that outgasing gases are corrosive and can damage
electronics especially contacts, relays, connectors, pots and the like.
Nick
N1KMP
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Dick:
Unless you are looking for something to do, I also suggest you are over
concerned. During the recent CQWW CW on the island of St. Croix, we had
3 K3s all driving amps. We probably had 3 or 4 outages without incident.
Similarly, as a single op on the island of Montserrat during the last
than 25A it uses the battery for the difference from up to 35A. It
charges the battery at 5A with normal power.Tom - wa4ta
Date: Mon, 22 Dec 2014 13:51:52 -0600
From: rpfj...@embarqmail.com
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 13.8 VDC power
Wow, thanks to all
@mailman.qth.net
Subject: Re: [Elecraft] K3 13.8 VDC power
Dick,
Yes, hydrogen outgassing is a potential problem, and the area containing a
normal lead-acid battery should not only be protected from sparks and
ignition sources, but should also be vented to the outside.
I would suggest that you look
I'm just curios is there any real test data available showing what IMD
may be present at various supply voltages? I have heard many comments
on the reflector over the years saying to keep the voltage high one
member saying to keep it at 15V.The specs say 13.8 V nominal during
TX. (11
: Mon, 22 Dec 2014 13:51:52 -0600
From: rpfj...@embarqmail.com
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 13.8 VDC power
Wow, thanks to all for the greatly informative answers. I gleaned many
good ideas from them.
This is my concern; I am interested in protecting my K3
David,
I think the answer to your question is a matter of degree.
I do not have any specific test data on the IMD increase as the DC
voltage is reduced, but it is a fact that the IMD with 'nominal 12 volt'
transceivers will worsen as the voltage drops.
The fact that the K3 IMD is better than
Well, more good information. Maybe I stand corrected. It's been nearly
4 years since I have read the manual, and my memory may have read more
into the statements than it should have.
I refer to page 13, right hand column, halfway down, entitled POWER.
There is a note that reads To ensure
On Mon,12/22/2014 2:50 PM, david Moes wrote:
I'm just curios is there any real test data available showing what
IMD may be present at various supply voltages?
The link below is for a presentation that K6XX and I did to NCCC a year
or so ago. See slide #42 for some measurements that Bob did.
Is anyone floating a battery across their power distribution?
Dick, n0ce
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On Sun,12/21/2014 11:31 PM, Richard Fjeld wrote:
Is anyone floating a battery across their power distribution?
Sure. I've done it for ten years. A fundamental requirement is a
regulated supply set to a voltage that is matched to the battery's
desired charging or float voltage. You want to
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