Ken:
Toroidal cores have many fine qualities for loading coils. Of course not all
core have the same qualities so be sure you have the right Al rating. You
will want a low rating. Also remember you will lose those fine qualities if
you saturate them so be sure your core is big enough for 250 watts
Hi Mike:
Thank you for sharing about the Bulldog supplies. I have never heard of them
before. My first reaction to the pictures is sooo ugly only its mother would
love it. The spec sheets are clear but leave out a few things. Maybe you know.
If it is a switcher what is its noise specification?
Of Fred Townsend
Sent: Sunday, May 06, 2012 10:56 AM
To: amsct...@comcast.net; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Power Supplies
Hi Mike:
Thank you for sharing about the Bulldog supplies. I have never heard of them
before. My first reaction to the pictures is sooo ugly only its
Charles you have a shorted cell within the battery. It is a fatal error. The
battery must be replaced. Shorting of cells occurs when the battery is
allowed to remain in a discharged state, particularly in freezing weather.
Fred, AE6QL
-Original Message-
From:
These are mostly depot level Teletype and Facsimile WWII and Korean War era
originals. A sampling:
1. Technical Manual Model 35 ASR
2. Teletype Parts List (Includes schematics) circa 1942
3. Teletype High Speed Punch Set circa 1965
4. Teletype TD TT-187/UG circa 1963
Guy: Without putting too fine an edge on it and if I understand David it
seems he has increased the thermal conductivity and thereby decreased the
temperature differential across the heatsink assembly. This reduces thermal
stress and is a good thing and similar to what you strive to do with your
Dennis I just finished doing that mod this morning getting ready for field
day. I'd like to tell you was easy but it's not. I'm a professional so I
have all the tools. It took me about three hours. I could have done it a lot
faster but I was extra careful not to drop hardware or leave soldering
Please see comments below.
-Original Message-
From: bill ny9h [mailto:n...@arrl.net]
Sent: Friday, June 22, 2012 8:33 AM
To: Fred Townsend; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 12VDC OUT current modification...tools
I'd like to tell you was easy but it's
Lee I had exactly the same problem at FD this year. Before I illuminate the
problem a little background. We were running 2A with additional GOTA and VHF
stations. Last year the very noisy old 6KW generator puked a piston so it
was time to retire it. We wanted a new generator that could be carried
Rick I use Teflon wire for my battery leads. Teflon wire is silver plated.
The Anderson power poles are silver plated too. While I can not quote
chapter and verse most NASA applications require crimp (with certified
crimper). There are at least two reasons. Solder wets and runs within silver
braid
I have been following this thread with much interest but I have not seen a
mention of magnets or springs. Springs may weaken with time but then again I
believe magnets can degrade with time as well. Within limits, I would expect
springs to be linear but magnets would be piecewise linear too.
Lee your K3 is protected from over current in a number of ways. The worst
case I can imagine in your shack is a heavy metal object falling across and
shorting the unprotected power leads to the K3. I have had this happen. To
protect against this you place fuses at the battery. Your Astron has
John I have no knowledge of what Elecraft is going to do. In general there
are three distinct technologies out there and it is difficult to make a
charger that crosses those boundaries. Lead (car battery, gel cell etc.),
NiCd/Niah, and Lithium. With the higher efficiency and lower weight of the
Thanks Ed for unraveling some of the misunderstanding of solar cells and
batteries. It is pure folly to think that you can apply faulty math to
highly optimistic and sometimes politicized ratings while totally ignoring
system efficiencies and come to any meaningful conclusion.
The standard way of
I have a bazooka match. Does that mean I'm a big gun?
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
cq_dx_de_aa...@yahoo.com
Sent: Tuesday, July 03, 2012 5:39 PM
To: Elecraft
Subject: Re: [Elecraft] OT - station pistol
Dave I am not familiar with the Yaesu brand rotor. If it is like the
American brand rotors (or perhaps made by an American company for Yaesu) the
pot is non-standard. I would check with an Alliance brand repair manual and
see if the parts are similar. Parts for most American rotors are available
Tom with good engineering practice there is no reason why you can't
successfully connect using BlueTooth. However good engineering practice
isn't always practiced. That's why any commercial manufacturer, constructing
an appliance of the kind you describe, must undergo certified testing.
However I
Oh it has pop rivets too? Ya! That's what I really want to lay ash on my
delicate electronics. Something that I can't move or pack while it's hot,
gets soot all over my backpack and rusts when it's left out overnight.
Notice they don't say how much current it puts out. That's because
thermopiles
Don't forget the solar awnings. The ones at our local college wipe out the
commercial broadcast (AM) band. At least they go dark when the sun does.
Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Bob, did you make any temperature measurements? I bet the amp ran cooler
too.
73, Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bob
Sent: Saturday, July 21, 2012 12:31 PM
To: Elecraft@mailman.qth.net
Subject:
Generally the answer to your question is yes. However I am reminded of the
old cartoon where the patient is asking the doctor who is treating his
broken arm. 'Doctor when my arm mends will I be able to play the violin?'
'Of course,' the doctor answered.
The patient replied, 'Good! I never could
David: Who are you going to believe? Me or your lying eyes? (;
While it is highly desirable to use a clean exciter, The only way a clean
exciter can make a bad amp better is to enclose the amp in a feedback loop
originating in the PA and terminating in the exciter. This can be done in a
rig such
David I have no opinion on Juma, the company or its products. I have no dog
in this hunt. I was speaking to what I consider to be the facts. Perhaps my
poor attempt at humor mislead you. I was speaking to the differences of
internal versus external amps and the use of feedback.
Back in amplifier
BNCs are known as constant impedance connectors but what impedance? Usually
it's 50 ohms but there are 75 ohm out there particularly in the video world.
They do have different dimensions but you are not likely to detect the
difference with the naked eye. Jack you are absolutely correct that at
Jim I'm not sure what you are looking for here. It is highly desirable to
use parts with a second source. That way if the factory burns down you are
not put out of business. That being said with RF parts the second source is
seldom identical hence the reference to the manufacturer. Manufacturing
Gary there are many factors effecting ground systems. In general concrete is
fairly conductive year round but earth conductivity is highly dependent on
the type of soil and its moisture content. Many a user of ground return
telephone systems found out clay soil in the summer could make you sound a
Rick:
I too thought bungee cords the idea solution for hanging wire antennas. In
less than three months I had to redo the whole installation. My bungees had
cracks every centimeter or so. Finally one of the cracks parted completely.
I can't tell you the brand but was all black, made in China, and
The cable you reference is built with RG59 (75 ohm) which should put to bed
the question of whether the application must use 50 ohm.
Personally I don't want a 75 ohm cable in the shack where I might use it on
my Ant 3 (K3) connection where it will make a difference. Each to his own.
73
Fred, AE6QL
Jeff, caution. Laptop power external supplies are designed to be followed
by precision internal regulators that handle the logic voltages and charging
the battery. The external supplies are not well regulated and can be quite
noisy. They may not be the best supplies for ham rigs.
73
Fred, AE6QL
I'd like to second Don's comments. Often the difference between a noisy power
supply and a quiet one is the separation of only a few feet. The idea place for
the supply is on the floor away from the receiver and freeing desktop space. I
have mine paralleled with a storage battery too. That
David, remember becoming 'nit free' leads to becoming 'lice free'. You are
correct that 'tuning' may have something to with bringing the circuit into
resonance but the term 'tuning' has other meanings too. For instance if we
equate tuning as bringing into resonance then we could not use the term
OT These are the batteries that power the Tesla and are sold to hams by
Buddipole and others.
http://autos.yahoo.com/blogs/motoramic/battery-builder-a123-won-249-million-
federal-grant-143806554.html
__
Elecraft mailing list
Lew, with a good digital ohm meter and 0.6 ohms of resistance you can
sometimes walk down the traces looking for a 0.0 (or as low as your test
leads measure) short. This doesn't always work since your problem may not be
a dead short but it is a simple starting point before going into more
advanced
Jim:
There are other batteries but none that will last ten years and give you 3
volts. I understand you not wanting to pay the surcharge UPS wants for a
lithium battery transport but there is a simple solution. Buy the CR2032
battery holder from Digikey and have it shipped first class mail. Then
Hair dye = artificial intelligence
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Sunday, November 04, 2012 9:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] blonde moment
I used to have dark
Gary I can't speak for Elecraft but I really doubt you will ever see a USB
port of the kind you want. Take a look at the third letter in USB. It stands
for 'Bus'. In the PC there is a pretty good sized chip called the 'South
Bridge' chip that de-multiplexes the bus. Sure you can do the job with
Gary there are inline BlueTooth products that will work with your QC15. They
are a bit pricie and hard to find. I know Sony made one. Be wary of the
cell phone versions. There are not stereo. More comments below:
-Original Message-
From: elecraft-boun...@mailman.qth.net
Please see comments below:
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Brian Alsop
Sent: Friday, November 09, 2012 4:26 AM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 USB request
On 11/9/2012 04:55, David
Rich I'm not sure which calibration you are referring too but as long as you
stay with the specified input voltage range, all calibration will not
change.
73, Fred AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Gentlemen:
I have my doubts about acetone being used in nail polish but it's possible
some manufacturers are using it to cheapen their products. It's a poor
solvent for this purpose. However there is no doubt acetone is used in
almost every nail polish remover. I keep some in the medical cabinet
Brain, let me amplify a little on what Don said.
First most laboratory inductance bridges measure at a 1000 Hz. A few will
option to measure at 1 MHz.
Second, the core material used here tends to act like a bandpass filter because
it has an upper and a lower cut off frequency. If a measurement
Hi Steef:
I don't know about your first idea; I will let others comment.
As for your second idea I can think of several reasons that may not work.
Any internal power supply would have to be small and that would likely mean
a switching power supply. The KPA500 avoided using a switching power
Jeff based on my experience with this machined pin type socket I have never
seen a problem because they grip in multiple locations on the side of the
pin. Your trouble is likely elsewhere. If trouble is suspected I would
remove the tywrap and use a small screw driver to lever the module out from
Do you have a method of submitting errata?
de Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Sunday, April 17, 2011 10:29 AM
To: j...@audiosystemsgroup.com
Cc: elecraft@mailman.qth.net
Gentlemen it would seem there are two issues here. Hard copy and soft copy. Let
me address soft copy first.
The software industry has a similar problem where it deals with dynamic code
and its documentation. Bug lists are maintained but not generally published.
Instead new code and
I had heard that it was possible to get access to the radio room on certain
cruise lines. I asked one (unnamed) line what the procedure was for getting
access. They said it was verboten and seemed irritated I would even ask.
Then I checked with the Maritime Union. It seems the US flags don't have
This has probably been asked before, if so, can someone point me to the
achieve. Is there a remote tune feature for a screwdriver antenna? Can I use
the ATU as a second tuner with the screwdriver?
73
de Fred AE6QL
__
Elecraft
Next time ( if there is a next time) (I'd rather have ordered the KPA500),
I pick the cruise line instead of the XYL.
^ picking
Careful, you are on thin ice. You don't let her read your e-mails do you?
Fred
-Original Message-
From: elecraft-boun...@mailman.qth.net
Randy:
I can not speak to your local building codes but the rule of thumb is
lightning does not like to travel horizontally. That doesn't mean it won't
happen but usually lightning seeks the shortest path to ground. That
suggests you should connect to the closest ground (exception: any fuel
line).
a pointed lightning rod at the top.
de Fred AE6QL.
-Original Message-
From: Steve Ellington [mailto:n...@carolina.rr.com]
Sent: Thursday, April 21, 2011 12:28 PM
To: Fred Townsend; 'Randy Moore'; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Ligntning protection
Question:
Does grounding
Please see comments below:
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike Morrow
Sent: Thursday, April 21, 2011 1:22 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KX1 strikes again - Cruise Ship Bootleg
John, if you have a P3 does it report the frequency correctly?
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Harden
Sent: Saturday, April 23, 2011 2:13 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 DXBase
Subject: Re: [Elecraft] SSB Net Frequency (14.316, etc.)
Not bad here in AZ. The notch should take it out. I would say stay on 316.
John N1JM
#2555
I keep seeing geographic messages about 316. It's not about geography. It's
about your neighbor or the kid down the block. 14.316 is a standard
But Lou a dual RCA jack costs about the same as a single jack. Besides it's
the K Line now and what better way to push a line than multiple plugins?
de Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W0FK
Sent:
...
I'm having a difficult time believing you guys think that should be a
serious consideration.
Besides, from a purely theoretical point of view, daisy chain power
connections are not the smartest configuration in the first place.
Dave AB7E
On 5/2/2011 9:47 PM, Fred Townsend wrote:
But Lou
I would disagree on being the 'most reasonable' [fix]. However I do think
the relay solution is a good one if you are planning on plugging the 12 V
coffee pot in.
I think this issue is the classic glass half empty or half full. There are
really two issues:
1) A field Fix
2) A wish list for
One minor point. If your feed point impeadance is really 300 ohms (folded
dipole) then you should be using a 6:1 balun.
73, Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ray Spreadbury
Sent: Tuesday, May 03,
I will add a few comments to Cookie's good advice. If you are wondering if
your ham shack is wired with 15 or 20 amp service here is an easy way to
tell. There are two common types of grounded duplex receptacles available in
the USA. The NEMA 5-15R type has two parallel blades with the U ground
That a popular 30 amp connector. The 8 or 10 gage cord sets are available
online. I have seen the plugs for DIY at Home Depot and Lowes.
de Fred AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Leigh L. Klotz, Jr
FYI: A flaky orange color has always been the trade mark an (anonymous)
Japanese/Chinese manufacturer. I call it Japanese orange. I have cursed
them many times. 11uH would not be a standard value. (i.e. special order)
73
Fred
-Original Message-
From: elecraft-boun...@mailman.qth.net
I don't know of anything particularly ESD sensitive on the tuner but foil
certainly won't hurt. You are already doing the right things with the wrist
strap etc. A few ESD prevention personal caveats (the proof is left to the
reader):
1. Avoid Styrofoam or similar plastics like the
Larry I do RFI engineering. Pacemakers are a lot like avionics relative to ham
radio. The working spectrums for pacemakers, avionics, and ham radios are
widely
separated by both frequency and function. The probability of their mutual
interaction is very small. Unfortunately the penalty for
Something smells... is that your rig burning. Seriously, a battery will act as
a
voltage clamp unless it is open.
Power supplies make good battery chargers but the converse is not true.
Chargers
do not contain filter caps so the voltage can spike, particularly if the
battery
is
I haven't seen any of the problems you suggest nor would I expect them. The
circuits are digitally controlled with feedback and temperature monitoring.
This is not your grandfather's open loop analog rig.
de Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
John I helped develop some the cleaning systems for delicate boards
including RF assemblies. I have done a great deal of conformal coatings.
Conformal coatings are not to be taken lightly. There are major tradeoffs.
First the cleaning.
Alcohol, on a Q-Tip, may be used for spot cleaning. Dunk
. The buyer's country law almost
always applies which is to say no law at all if we are shipping to many
third world countries.
In the end I think you can understand why it is far easier to say CONUS
ONLY.
Fred Townsend, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
Dave I think you raise some very good points. The need for an Amateur
Wireless User Interface (AWUI) is a great one. Note I did not say blue tooth
for good reason.
Bluetooth is full duplex where clearly a half-duplex solution is needed.
Before you say you could use VOX think about the portable
Remember Amazon ships from all over the country using the nearest stock.
de, Fred AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Lowman
Sent: Friday, June 03, 2011 3:06 PM
To: elecraft@mailman.qth.net
Subject:
Jon: I can't comment on the KAT100 but I can on fuse ratings. The blowing
current rating varies according to type. For the type fuse I suspect you are
using it would be something like 200% (of rating) for 10 seconds. At 110%
the blowing time could be minutes. Hope this helps.
73
de Fred, AE6QL
Andy, I'm not sure what you are asking. In years gone by line art and
picture renderings were sometimes generated in manufacturing engineering.
For others pictures were generated in publications with the manuals. Such
drawings were often marked Do Not Scale because they were not accurate.
They
Hi John:
OK let's say your requirement is for a low noise, high efficiency converter
delivering 4.5 to 5V at up to 1 amp. There are hundreds of series linear
regulators that will do that job but the will dissipate more than 3 watts as
heat and that will require a small heatsink. For greater
Tony and all:
I agree it should be easy to tap off the IF but I suspect that will be a
relatively high impedance point and will require a source follower (cathode
follower) circuit to drive the coax without dragging down the signal.
I seem to remember a QST article on adding a pan adapter to the
Hello Don:
If you have cured your RF problems I'm not sure why you are asking your
questions.
In general adding a choke or capacitors to your power lead shouldn't hurt
anything so give it a try. I will add detail to your questions below. BTW
you should indicate how much power you are running and
The CM500 also comes with a Stereo (1/8) to mono 1/4 adapter.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Keith Hamilton
Sent: Thursday, February 16, 2012 11:24 AM
To: Joe K2UF; Elecraft@mailman.qth.net
Subject: Re:
John the problems with this type of fuse (cartridge) and fuse holder are
legendary. The higher the current the bigger the problem. In the factory I
have seen entire lots of defective fuses and fuse holders. The problem is
made worse by soldering fluxes. If you must solder a fuse holder, be sure
But the signal contains harmonics...
Fred
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Matt Zilmer
Sent: Wednesday, February 22, 2012 6:26 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Check this - www.google.com
A couple of questions:
I use 4 wire voltage sensing as Ron suggests below. I have calibrated my K3
voltage readings and power supply set point voltage using a 4 1/2 place DVM.
I always see a lower voltage on the K3. Somewhere around 200 mv on receive
(depends on accessary load). I also see on the
Jim:
You need to pay attention to your numbers. R=0, X=1, SWR=1.0 is a short
circuit with a short piece of wire. While it is possible to have multiple
resonances and multiple nulls this not the case here. You have a major
problem. Perhaps something is breaking down or perhaps you have made a
I have used a number of G5RVs, both with and without balun. I carry one in
my 'go-kit' because it goes up quickly and comes down easily. I have used
duel band dipoles too but found them harder to get set up properly. The
spacers would tend to get snagged in trees and made them harder to coil up
Lee: Please see answers inline.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lee Buller
Sent: Friday, March 09, 2012 6:38 PM
To: Elecraft Reflector
Subject: [Elecraft] Power Cord Questions
I am rebuilding the power cord
Ron, Rick, Erik: There are many reasons why temperature measurements are a
poor way of evaluating a tuner. There is a method of power measure based on
temperature rise. It's called a bolometer. It only works well if the mass
involved is small. Wiki bolometers if you want the details.
I think
. If
you can make QSO's, it works.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO Party 6-7 Oct 2012
- www.cqp.org
On 3/10/2012 4:56 PM, Fred Townsend wrote:
Ron, Rick, Erik: There are many reasons why temperature measurements
are a poor way of evaluating a tuner
Blair Bates wrote
I've used a drop of Coca-Cola on each equipment foot.
73 de k3yd
Diet or Regular? Caffeine?
NOT Zero
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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
Dave New, N8SBE wrote:
The K3 is just too darn light -- you need a MAN'S radio, one of those
YaeComWood 50-pounders.
How about a SuperPro and a BC610
Coming soon, specially crafted for all those stay-at-home K3s:
replacement top and bottom covers made from Depleted Uranium.
Correction:
Is the hair pointed upward?
(Hint see Dilbert)
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric Swartz - WA6HHQ,
Elecraft
Sent: Tuesday, February 19, 2013 11:28 AM
To: Jim Wiley
Cc: elecraft@mailman.qth.net
Subject: Re:
Rick:
I recommend the Energizer Ultimates. I have never seen corrosion with them
but that doesn't mean it can't happen. They give roughly twice the power at
half the weight. However they are pricy.
73,
Fred, AE6QL
-Original Message-
From: elecraft-boun...@mailman.qth.net
Ira:
Your comments concern me a bit. It is important to remember the electrolet
microphone requires a bias voltage but does not consume any electrical
power; i.e. you are not powering the microphone. Rather the microphone is
modulating the bias voltage. However there may be a current flow within
Gentlemen:
I think you muddy the waters when you refer to preamps and electrolet
headsets such as the CM500 in the same context. There is no appreciable
current flow in the CM-500. That's why you can run the bias for years with a
pair of AAA batteries. Let's take discussions of preamps with 10 ma
John, as a former program director I can verify it is difficult to talk
about sounds without reproducing that sound. Yes you can add sound to Power
Point presentations but why reinvent the wheel? I have a substantial
collection (70) of videos (with sound) downloaded mostly from Youtube. I
will be
drives as faster than trying to
discover and download material which has taken me years to accumulate. Your
thoughts David?
73
Fred, AE6QL
-Original Message-
From: David Cutter [mailto:d.cut...@ntlworld.com]
Sent: Saturday, April 06, 2013 2:34 AM
To: Fred Townsend
Subject: Re
Vic let me clarify a few issues.
1. At 665 AH your sealed battery is almost certainly a wet battery
(i.e. not a gel).
2. A charging voltage between 13.5 and 14.2 is normal. 14.5 is a bit
high unless the charger is temperature compensated and the weather is very
cold (in the area of your
The license is 5 months expired too.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of tnny...@yahoo.com
Sent: Tuesday, April 16, 2013 10:59 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] SCAM
Listing #1060014on QTH
Gary, you may be trying to chop the cabbage a bit finer than necessary. If
you take a close look at the input power circuit for the K3 you will see the
power pole voltage is the voltage seen by the circuit breaker and the 100W
amp. The voltage measured by the K3 is after the polyfuse (12A) which
The most powerful batteries on the planet are only a few millimeters in
size, yet they pack such a punch that a driver could use a cellphone powered
by these batteries to jump-start a dead car battery-and then recharge the
phone in the blink of an eye.
Sounds like an April fools addition to me.
Jim:
Be careful what you ask for. Solar arrays are not rated for average.
Probably because there is no such thing as an average sun. I'd like to say
they are rated for peak power but that is somewhat illusionary too. How much
power you actually get from an array depends on many things. You will
Cliff, there is a wealth of information already written on this subject. I
suggest you check the archives. Some drop is normal but the amount depends
on your setup. The direct answer to your question depends on several
factors. You need to determine where the voltage drop is occurring. It may
be
David, I find the results of your research strange. Lithium batteries are
several orders of magnitude more dangerous than SLA. They catch fire and
water and ordinary fire extinguishers don't work on Lithium! Please see
http://www.bobatkins.com/photography/li_battery_restrictions.html for TSA
Ignacy raises a chilling point: Asking is more trouble than help as most
personnel is [are] ignorant of rules and they could create some [rules] to
appear competent. I find this statement to be frightenly true. To use a
data term the system uses forward error correction meaning they install a
new
Robb:
... would that have to be UL listed?
The answer is yes. Additional certifications would be needed elsewhere in
the world.
Worse, power line surge and conducted emissions tests would be needed. These
tests are not cheap.
de Fred, AE6QL
-Original Message-
From:
Larry much has been written about defining the signal to noise ratio of a
receiver. You might want to search on this subject.
Hopefully I can simply things a bit. It is the designer's goal to get the
receiver noise lower than the ambient noise. Once that is done you are at
the mercy of the
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