Thanks for the detailed explanation Don.
I set the voltage for 4000kHz at several points and noted the corresponding
voltage for 7000kHz as follows:
4000 7000
6.10 - 1.594
6.50 - 1.733
6.60 - 1.768
6.70 - 1.800
The last set of figures, 6.70 and 1.800, appear to be the best compromise? The
I got in late on this thread but are you refuting to the PR6 preamp? That
was connected and not letting the K3 shut down because of it being connected
to the aux 12v connector on the rear of the K3?
If this was what was happening I just installed a PR6 on an ser # 5299 and
had no problems I did
Andrew,
You made a good choice.
73,
Don W3FPR
On 1/1/2013 3:40 AM, andrew wrote:
Thanks for the detailed explanation Don.
I set the voltage for 4000kHz at several points and noted the corresponding
voltage for 7000kHz as follows:
4000 7000
6.10 - 1.594
6.50 - 1.733
6.60 - 1.768
6.70 -
I purchased this case for my KX3 from Ebay. (
http://www.ebay.com/itm/270663579154?_trksid=p5197.c0.m619) With the addition
of a couple of foam it is as perfect as it gets. The radio is in the bottom
and a separate area on top for cables, mic etc. Have a wonderful and healthy
new year.
Jay,
I had one of these in my attic for several months.
I had to tune each band by generally shortening the elements.
Start at 10M. Find its resonant point via antenna analyzer or by
sweeping frequencies with your SWR meter. You need to confirm that
the resonant point is too low before
1N5711 Schottky diodes. Those are the only thing that have failed in my
10-year-old K2/100.
On Jun 18, 2011, at 7:42 AM, drewko drew...@verizon.net wrote:
Headphone jack.
73,
Drew
AF2Z
On Sat, 18 Jun 2011 21:23:01 +1000, you wrote:
Has there been any trends over time, where the
Dear K2-Experts,
I´m just assembling my K2, and it´s true: It really is addictive :)
After winding my first toroid inductors, I measured their inductivity
with an atlas LCR40 component analyser before I soldered them into the
RF board.
Though I closely adhered to the manual, the measured
On Dec 29, 2012, at 10:53 AM, hawley, charles j jr c-haw...@illinois.edu
wrote:
My wife wants to know what Bill bought her:)
A $400 leather purse she wanted.
Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: Not within a thousand
On Dec 31, 2012, at 4:37 PM, Matt Zilmer mzil...@verizon.net wrote:
Whatever is not working, Elecaft's reputation for stellar support is
well-deserved more than just a reputation.
Part of the reason I love my Elecraft equipment.
Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web:
On Dec 31, 2012, at 4:49 PM, Gary Surrency g...@elecraft.com wrote:
A typical 2.7 filter offset will be something like -0.91 or -0.89 with the
negative sign definitely to be included in the menu or filter setup in the K3
Utility.
Mine was -0.79, and entered correctly.
After my kludged
Hi Daniel
I must admit I took the cowards way out and ordered the pre-wound ones. But I'm
interested in seeing the responses you get from others that may have measured
them.
Happy New Year
73,
Fred/N0AZZ
-Original Message-
From: elecraft-boun...@mailman.qth.net
Daniel,
The inductance of the RF Choke toroids measured at DC or low frequencies
may not agree with the published inductane which is measured at a higher
frequency. Those RF Chokes are not critical, they just need to block
the RF flow and the bypass capacitor takes care of the rest.
The
Thanks a lot
gd, gl, cuagn
73 de
vr2wua
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While we are discussing toroids, be careful not to put an extra turn on
the toroids. A straight wire through the center of the core is 1 turn,
a full wrap around the core is two turns. Toroids are different than
solenoidal inductors.
73,
Don W3FPR
On 1/1/2013 9:14 AM, Daniel Heise wrote:
Don,
Interesting that one never knows just how the quoted inductance is
determined.
Do you have any idea just how the Elecraft quoted inductances are
determined?
If measured, what frequency and test jig.
If based upon calculations, how much as built variation will there be.
Have had the
Brian,
The K2 toroids are specified in the manual for a given number of turns
on the proper core rather than their absolute inductance. The only
reference to the inductance is on the schematic and in some instances on
the parts list. What I can say for certain is that whatever the
Jack,
Predicting the particular failure that you will experience is a pure SWAG.
However, the most common failure point for a basic K2 is the headphone
jack. If you have a KPA100, then the wattmeter diodes (1N5711) is the
most common failure point - that can be minimized by connecting the K2
Well... spoke too soon... still does it. Guess I need to get the scope out
and figure this out...
Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ
Owner - Operator
Big Signal Ranch
Staunton, Illinois
email: b...@wjschmidt.com
-Original Message-
From: Matt Zilmer
Jan -KX2A,
I posted the macro info below many months ago. It might help you and others
that want to create macros for use with a K3 or KX3. After you become familiar
with creating and using macros to more easily set up your K3, check out the
Elecraft archives for a posting I made regarding
A couple years ago when contemplating kit versions of the high
performance band reject, high pass and low pass filters I sell, I
measured the inductance of 32 toroid cores I wound according to
instructions similar to those found in the Elecraft manual, i.e., with a
certain type core and magnet
The right word is inductance. One of the most fundamental principles
of electrical circuits is that pure components -- that is, a coil that
has ONLY inductance, a capacitor that has ONLY capacitance, a resistor
that his ONLY resistance -- do not exist in the real world. All real
components
Fred, that jumper is involved only when using the CTRL input to turn the PR6
off when the K3 is on bands other than 6 meters so you can use the RX
antenna connections on other bands. See page 2 of your PR6 manual.
73, Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
Hi,
How did you measure that? They are very different from my measurements. Here
is what I did:
Put radio TX in Test mode to protect the XG3.
Connect XG3 to antenna 1 at -74dBm on 10m.
Measure:
port 1: -76dBm
port 2: -107dBm (port connected to another antenna switch which presents a
short
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
Knut,
FWIW I found that the isolation between the ANT 1 and 2 ports of my KAT100
on 15m was only approx 40db. To increase the isolation between ports, not
only did I have to add a relay to ground the port not in use, but I also had
to replace the relay-to-port unshielded wiring with coax.
I built this transverter in 2010 for the
VHF contests and it was aligned by
Elecraft service. (The power module was
bad out of the box so they replaced the
module and performed an alignment.) It
puts out full power and works great with
my FT-817. I'm working on simplifying my
rover so this
“...How did you measure that? They are very different from my measurements. ..”
I measured the isolation with my Array Solutions VNA2180.
Phil – AD5X
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Help:
Hi,
Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA
(vector network analyzer). Those will be different numbers and not what I
had in mind. What I am interested in is how much an unwanted signal on one
antenna port is attenuated when another antenna port is selected. Or
..Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA
(vector network analyzer)
I should have been clearer. I connected the VNA output to Port2, the VNA input
to the radio port, and I selected Port 1. So isolation measured was Port2 to
common when Port1 was selected.
I can only second that. The announced built-in 2m module is a must for
me to complete the KX3 as a portable and mobile radio.
Anybody else? Maybe Eric and Wayne would reconsider the 100W priorities :-)
73 es HNY!
Gernot,
DF5RF
Am 28.12.2012 15:56, schrieb Robert Vargas (KP4Y):
Does anyone
Small transmitting loops by their very nature involve high levels of
current flow and this can/will cause ordinary variable caps to heat,
which results in tuning drift. Most home builders use vacuum caps
and relatively large copper pipe in their designs. Mechanical joints
(clamps, wiping
Hello again,
Hmm, that should produce similar results to mine. One possibly important
difference is that the VNA ports are perfectly matched 50ohm ports, but that
shouldn't make that much of a difference. Have you ever tried to connect a
dummy load to one of the ports (leaving the KAT500 in the
Hi Ken
I have had the MFJ 3 foot loop for several years. I am now using it to receive
only as it has a better signal to noise ratio than my Hy-Tower vertical. I
found the SWR drifted badly due to changes in temperature caused by sun light
and the environment. I felt it was much more stable at
Small TX loops are a moderately unexplored section of the radio universe
by hams. Impedances are very low, hence very high currents, I^2 * R
suggests small resistances really count.
I sold my Buddipole, which I've used in many field and SOTA excursions
and got an AlexLoop. Much lighter,
It is a low power USB device, because it does not power anything in the
rig. The only connections are TX data, RX data and common (ground)--see
page 5 of the KX3 manual. It won't strain either of those USB hubs.
--Tim (KR0U)
I bought a Mac with only four USB ports and am going to purchase a
Hi Ken
I have had the MFJ 3 foot loop for several years. I am now using it to receive
only as it has a better signal to noise ratio than my Hy-Tower vertical. I
found the SWR drifted badly due to changes in temperature caused by sun light
and the environment. I felt it was much more stable at
I appreciate the several responses I have had regarding the problem I am
experiencing with the iSDR app and my KX3 . Using the information from these
responses I am making progress but still have one last thing to resolve.
To clarify a couple of earlier issues, my iPad is the latest version
On 1/1/2013 9:47 PM, GDR wrote:
...
To clarify a couple of earlier issues, my iPad is the latest version
which Apple calls the new iPad, not the iPad 3 or 4. It has the new
lightning connector (tiny) that can be used with the latest iPhone5.
I just purchased a new iPad and has the tiny
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
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