The old trick of using a light bulb for a dummy load, isn't a dummy load
either. I had a Q with a fellow in Texas, from Ft. Collins Colorado, in 1967,
on a pair of phased inverted vees an inch or so longheld in a vacumn by
a clear round glass.
I believe it was rated at 60 watt.
Bill - K6WLM wrote:
In the case of Astron supplies it can damage parts of the DC regulator. If
there is a Crow Bar circuit that operates with a battery connected to the
power supply output it will ruin your day or even burn your house down.
---
How can that produce
Since Astron has been mentioned in this thread, I'll use that as an example.
The SCR that is part of the crowbar is connected directly across the output
terminals of the supply. When used normally, the firing of the SCR shorts the
output and the supply goes into current limit, if still
Finally, a voice of reason.
--- On Sun, 6/7/09, dave hott...@gulftel.com wrote:
From: dave hott...@gulftel.com
Subject: Re: [Elecraft] Battery Charging with DC Power Supply
To: mzil...@verizon.net
Cc: Elecraft@mailman.qth.net, Bill Miner w...@yahoo.com
Date: Sunday, June 7, 2009, 11:36 PM
I'm
Be careful. There is a voltage that is safe for trickle charging a battery,
but it is not the same voltage that is optimum for powering a transceiver.
Most if not all transceivers are built for optimum operation at about 13.8
volts which is also the optimum charging voltage for a short term
I believe I read somwhere that you can do a mod to Astron power supplies to
make the float chargable. They sell supplies that say they are for battery
back-up, I suspect they are already modified for float charge.
Frank - W4NHJ
- Original Message -
From: Ron D'Eau Claire
Tnx Wes!
So the battery voltage across the power supply terminals keeps the SCR
turned on, even though the supply voltage is turned off by the crowbar.
That would surely lead to a dead SCR without a suitable fuse in the battery
circuit.
Ron AC7AC
Since Astron has been
There was an article in QST a good while back about this. Theer were
two things that needed to be done, one of which was a fuse between the
battery and the power supply so if the crowbar triggered, the PS
wouldn't burn up, and the other was a resistor added so the 723
regulator would be protected
In a recent message, Doug Faunt N6TQS +1-510-655-8604 fa...@panix.com
wrote ...
There was an article in QST a good while back about this. Theer were
two things that needed to be done, one of which was a fuse between the
battery and the power supply so if the crowbar triggered, the PS
wouldn't
Why not use a PowerGate device from West Mountain Radio. We do that our club's
repeater site and it works darn good. The repeater is run off
batteries...while the Astron is used as a charger. The PowerGate takes care of
the charging issues.
Lee Buller K0WA
The New Kansas QSO Party -
A voltage as low as 12.anything will result in a sulfated battery. The
lowest float voltage I am aware of is 13.02 (2.17 VPC) on the
Rolls/Surrette batteries. All other manufacturers (that I am aware of)
recommend something closer to 13.5 or so. Don't listen to me or anyone
else on here -
Lee and the Group:
I have used a 73 AH battery with a fuse at the terminal, a PowerGate,
and a 35 Amp Astron power supply to run a K2. This has been set up for
about 2 years, and has been trouble free.
73,
Steve Kercel
AA4AK
Lee Buller wrote:
Why not use a PowerGate device from West
Ed,
Yes, the most likely place for your problem is the Pre-Mixer bandpass
filter adjustment.
Since you have checked the oscillator outputs with your RF Probe, Use
the RF Probe to monitor the output from the Pre-Mixer - adjust the
Pre-Mixer for maximum RF Voltage at pin 6 of P1 on the filter
http://www.eham.net/reviews/detail/4103
http://www.iotaengineering.com/iq.htm
--
View this message in context:
http://n2.nabble.com/Battery-Charging-with-DC-Power-Supply-tp3041295p3044805.html
Sent from the Elecraft mailing list archive at Nabble.com.
If still functional, the power supply regulator isn't turned off, it still
tries to supply some current* into the (nearly) short circuit SCR. At the same
time the battery supplies current limited only by its internal impedance and
the resistance of the interconnect.
* If I'm not mistaken
The power supply that is built to also be a battery charger
http://www.iotaengineering.com/dls45.htm
The reviews:
http://www.eham.net/reviews/detail/4103
Add an EXTERNAL IQ4 for better battery charging
http://www.iotaengineering.com/iq.htm
Do not buy the model with INTERNAL IQ4.
Howard
--
I have a travel trailer that had a switch-mode charger that was so noisy that
it interfered with (analog) TV reception in my house, when the trailer was next
to the house on shore power. Needless to say, radio operation was problematic.
So I built an analog smart charger using an Astron RS-35M
Hi All,
Just a note on the Iota DLS-30/IQ4 that I have. I originally purchased it
because I thought that I could also use it as a power supply as it is
advertised. As it turns out I can not use my Elecraft K2 while it is
plugged in charging a battery. The RFI is very great on 80 meters up to I
I'm going to use my K3 at our FD, mostly for the CW station but I'm sure some
may want to try it on SSB in a contest environment. I would appreciate any
input as to the best AGC settings (or any others settings for that matter)
for CW and SSB contesting.
73, Bill nx0t
--
View this message in
On my previous rig, it had ( like the K2 ) a way the user could turn off
XMIT.
When answering a CQ I like to adjust my keyer speed to approximate the
sender's pace at the same time I zero beat.
I would turn the XMIT off and then send a series of dits while adjusting
the keyer.
Then turn the XMIT
Yeah, Bill brought that up too.
On reflection, it makes sense to keep some current flowing through the SCR.
That would keep the system from oscillating. If the current through the SCR
dropped to zero, it would stop conducting, allowing full voltage to appear
at the supply output again which,
Hi Group,
My name is Ben. My callsign is KØBLR. I live up here in Central MN. I just
decided to join here because it looks like I am about go through the process of
buying a used K3/100W. From what I know about it has 2 filters in it and its
only about 1 week old or so. The owner is
Hi All,
I see that this was asked once before on the reflector but got no replies.
How well does the KAT3 work outside of the ham bands? Are the settings
still stored for out-of-band frequencies like those which are used for MARS
operation? My other choices are the LDG AT 200 Pro and one of the
Was great meeting everyone at SeaPac this past weekend (My feet still
hurt). :) Thanks for stopping by the Elecraft booth.
73 till next year!
Greg
AB7R
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
I hope this is ok to post.
I've had an idea for software but don't know if it already exists.
You tell the software what your location is.
You type in a callsign and it shows you not only the name, city, state
of the call.
But it also displays a map showing the approximate location on a map and
Hi Duane,
If I understand what you correctly, onto QRZ.com will do this for you.
Most logging programs also do this.
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
__
Elecraft mailing list
Home:
Already exists. See qrz.com/callsign - register and sign it. Look up call
of station you are interested in. Click on Click for more Detail - it
then shows you the distance in the text as well as a map of that stations
location and if you zoom out on the map, a line from you to them. Quite
QRZ.com already does all of that, plus give you the bearing from your
location to the other station. You only need to be logged in for that
capability, and click Click for more detail .. to bring up the map.
73,
Dave AB7E
dw wrote:
I hope this is ok to post.
I've had an idea for
Probably lots of them out there. One very nice package (if you're a Mac
person) is MacloggerDX. Not only does it show the station on a map, but
will turn your beam to the correct heading, etc.
http://www.dogparksoftware.com/MacLoggerDX.html
Oscar
On Mon, Jun 8, 2009 at 8:08 PM, dw
Yeah, but will it make coffee and work them too?
--- On Mon, 6/8/09, Oscar Staudt wb5...@gmail.com wrote:
From: Oscar Staudt wb5...@gmail.com
Subject: Re: [Elecraft] a cool software Idea
To: dw bw...@fastmail.fm
Cc: Elecraft_List elecraft@mailman.qth.net
Date: Monday, June 8, 2009, 7:32 PM
Digital Master from HRD will work them and the Radio Shack X-10 system will
make coffee...
On Mon, Jun 8, 2009 at 9:14 PM, Wes Stewart n...@yahoo.com wrote:
Yeah, but will it make coffee and work them too?
--- On Mon, 6/8/09, Oscar Staudt wb5...@gmail.com wrote:
From: Oscar Staudt
Sorry, guess that term wasn't real clear.
A power supply doesn't control the charge rate, it controls the output
voltage. Most bulk storage batteries don't want to charge at high
rates, say over 0.5C, although you can probably get away with it for a
time. Controlling the charge rate generally
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