So that there's no confusion, will you post one of the PDF file links
here. John KN5L
On 3/12/24 4:24 PM, Jim Brown wrote:
> On 3/12/2024 12:29 PM, John Oppenheimer wrote:
>> Did you measure a Choke Balun, or sometimes known as Common Code Choke
>
> "The book" are in
On 3/12/24 1:31 PM, Jim Brown wrote:
> I wrote the book on this. k9yc.com/RFI-Ham.pdf
Hi Jim, there are a bunch of inductor measurements within the book.
Did you measure a Choke Balun, or sometimes known as Common Code Choke
(CMC)?
John KN5L
2-Port VNWA measurements at 7MHz
Switch, VSWR, dB
0 1.01 0.07
1 1.03 1.06
1 1.03 1.06
3 1.02 3.08
6 1.03 6.31
10 1.02 9.78
20 1.05 19.97
VSWR approaches 1.1 at 30MHz with some switch settings.
John KN5L
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Fun today using Elecraft test equipment for purpose of measuring Ferrite
loss as a function of power. K3, DL1, and CP1.
Visit QSL.net, requires password access,
https://forums.qrz.com/index.php?threads/ft240-52-power.855486/page-3#post-6489172
Hi John, good read, thanks,
John KN5L
On 2/6/23 3:52 PM, John Harper wrote:
> Well, maybe a few hundred, plus 3 photos:
> https://ae5x.blogspot.com/2023/02/the-utility-of-elecrafts-cp1-bi.html
>
> If you're one of the many who now have a tinySA...
>
> 73,
> John AE5X
I also had power line interference on 7MHz. Made a shielded loop using a
Hula hoop as support, BL2 for balanced loop to coax, and KX3 receiver.
Didn't take long to DF it out.
John KN5L
On 6/7/22 8:36 PM, Alan Bloom wrote:
> Hi John,
>
> In this case the Internet is not via DSL, it's via cable.
> spurs are still there. There is no wired connection from the K4 or the
> desktop computer to the LAN (Wi-Fi only).
>
> Alan N1AL
>
>
> On 6/7/22 18:29, John Oppenheimer wrote:
>> Hi Alan,
>>
>> What is your TV/Internet provider?
>>
>> Joh
Hi Alan,
What is your TV/Internet provider?
John KN5L
On 6/7/22 6:59 PM, Alan Bloom wrote:
> The weird thing about these spurs is how clean and stable they are.
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Hi Walter,
Elecraft receivers, I'm familar with (K2,K3,KX[23], use "Feedback
Amplifiers" for their Pre Amp. The Feedback Amplifiers are designed for
nominal 50 ohm input impedance. Fifty ohm input impedance is somewhat
import for operation of the receiver bandpass filter.
I'll assume detector
Hi Mike,
Initial permeability can be computed from your values:
Compute 4T permeability=1 (Lo) using core dimensions:
Lo = 0.0004606 * Log10(OD / ID) * Ht * Turns^2 (Ht in mm)
Lo = 0.0004606 * Log10(6 / 2.6) * 14.3 * 16 = 0.0383uH (Ht in mm)
Initial Permeability ui = 6.6 / 0.0383 = 172
I've found preferred method for evaluating Ferrite Choke Balun common
mode rejection performance is to measure common mode rejection (CMR).
Some various 43 material examples, which demonstrate CMR is a function
of device inductance.
https://www.kn5l.net/Balun-CM/Balun-43material/
FT140-43 7T CMR
Hi Jerry,
Is current mode enabled? Described in the manual on page 104, "Reducing
Current Drain for portable Operation."
John KN5L
On 6/25/21 11:29 PM, jerry wrote:
> Well, not a big one.
>
> Somehow, the radio has decided not to do the bar graph on the display.
> Instead, it shows a dot -
Hi John,
I use my VNWA every few days. Would miss it if gone for a few weeks :-)
Though some thoughts: VNA's are, if calibrated and temperature stable,
inherently accurate. Requirements are:
Must have Log sample spacing.
2 port must have 12-term compensation. Required to normalize Port 2 Zin
Hi Peder,
K3s grounding post is also one of the board ground plane to enclosure
connections. See Assembly manual, Page 68, Figure 97.
John KN5L
On 6/23/21 9:58 PM, Peder Kittelson wrote:
> I have been following the Pin 1 grounding discussions with interest. I
> have one of the last Elecraft
Hi Roy,
A question best answered with a measurement. Appended to:
https://www.kn5l.net/debounce555/
is waveform for a Bug running just under 40WPM. One small weight at
fastest setting.
John KN5L
On 5/10/21 11:17 AM, Roy wrote:
> Relating to contact bounce, I wonder what the typical length of a
Hi Ian,
All Bugs have some amount of contact bounce. K3 does not have debounce
circuitry. I use a debounce device between Bug and rig. Several can be
found on the internet.
I made one: https://www.kn5l.net/debounce555/
John KN5L
On 5/9/21 12:38 PM, IK4EWX wrote:
> Dear friends, Elecraft K3S
Hi Adrian, welcome to the hobby and to the Elecraft list,
Wow, that's quite a collector's item! I'd consider asking Elecraft what
they'd charge to assemble and align for you.
John KN5L
On 2/14/21 3:32 PM, KJ7SOY wrote:
> Hi everyone! I’m new to the list and to Elecraft radios and HAM in
Is there a P3 ability for Ref Lev settings for receive antenna versus
antenna 1? Trying to evaluate SNR difference between transmit and
receive antennas. Receive antenna has about 35dB lower gain than
transmit antenna. 80M band.
John KN5L
Hi Lou,
Rigol DS2202A has time in saved image. But not date! Not sure why not
date, as it does have internal date for file system time stamp.
yes, prefer to have display with knobs and buttons!
Good luck with your search.
John KN5L
On 12/9/20 8:40 AM, Louandzip via Elecraft wrote:
> I saw the
Hi All,
Two price steps in Rigol/Siglent low price Oscilloscopes, $300 and $600.
$300 class has smaller and lower resolution display. Smaller display
results with limited size raster graphics output image files. Recently
upgraded to a Rigol DS2202A. Much larger display. Example image files
shown
Hi Jim,
The SimSmith model includes Fair-Rite complex permeability files, which
is the basis of the Ferrite model.
John KN5L
On 10/13/20 2:23 PM, Jim Brown wrote:
> On 10/13/2020 11:41 AM, John Oppenheimer wrote:
>> Jim, can you be more specific with flaws within the SimSmith model?
Jim, can you be more specific with flaws within the SimSmith model?
I've updated https://www.kn5l.net/Balun-CM/Balun31-43/ with Balun CMRR
window image. So that others don't need to load SimSmith and model from
the ZIP file link.
John KN5L
On 10/13/20 12:45 PM, Jim Brown wrote:
> you clearly
Hi Jim,
For high power Balun Applications, most critical parameter is Ferrite
core loss which causes core heating. Core loss, parallel resistance
(Rp), can be computed from complex permeability data from Fair-Rite.
https://www.kn5l.net/Balun-CM/Balun31-43/
Models FT240 10T with 31 and 43
Hi Jim,
Both the KX2 and W1 need to be calibrated to a standard. The W1 manual
4.5V is a rough calibration. As I remember, KX2's are calibrated at the
factory at some (I've forgotten) power level. Both the KX2 and W1 are
somewhat non linear.
For my shack, I've decided that a DL1, along with an
closer to instrument grade measurement than KX3
internal SWR measurement.
John KN5L
On 5/9/20 8:34 AM, John Oppenheimer wrote:
> Hi Drew,
>
> 50 MHz TX constant 4 W carrier:
>
> KX3 #1658
> KX3 PS 13.2 during XMIT
> ATU bypass
> Elecraft DL1
> K
Hi Drew,
50 MHz TX constant 4 W carrier:
KX3 #1658
KX3 PS 13.2 during XMIT
ATU bypass
Elecraft DL1
KX3 SWR 1.5
Current = 2.3A
John KN5L
On 5/8/20 6:52 PM, Mooneer Salem wrote:
> I got 2.36A current consumption @ 5W using a dummy load and the TX button
> on 50.100MHz USB with my KX3 (S/N 3262).
A typical, Type RG-58A Vf measurement, as a function of frequency, is
shown in second plot: https://www.kn5l.net/transMeasure/
Vf is frequency dependent.
John KN5L
On 4/1/20 4:45 PM, Mpridesti via Elecraft wrote:
> Requested technical comment from a long established coaxial cable
>
Hi Eric,
What is the measured SWR on 12M?
Way different band, worked VP6R 40M CW using K2 at ~15 watts and ground
plane 19' vertical.
John KN5L
On 10/24/19 3:08 PM, eric norris via Elecraft wrote:
> Force 12 C3 antenna is not resonant on 12m. Using the K3 barefoot, the
> internal atu tunes
Hi Joe,
Some cruise lines do allow ham radio. A presentation:
https://wparc.us/presentations/Cruise-Ham-Radio-Presentation-1.pdf
KX3 on Carnival: https://www.kn5l.net/hp0/
John KN5L
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Hi Kevin, A fun experiment. You were S3 at peaks with S3 urban noise.
All I could pull out was your pattern. Sending my call to match your
pattern. Ken, W0CZ, was only copy-able signal with 579 at peaks.
Station on this end, K2 at 15W with Ground Plane 19 foot vertical.
John KN5L
On 9/29/19
Was listed in a local group downsizing shack FS email.
John KN5L
On 9/27/19 5:10 AM, KE8LXD wrote:
> I am too looking for an unbuilt k1 kit for a while but don’t luck yet. May I
> ask where you found it?
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They are out there. Yesterday I purchased K1 #2573. Documentation
suggests vintage about late 2008, kit including errata F-8.
Has noise blanker option, but no ATU option. Anyone have an unbuilt ATU kit?
John KN5L
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Antenna of choice is portable ground plane vertical using Buddipole
components. Storing tripod and mast on back porch. This morning found
all three Virsa-T 3/8x20 threads with a mud cap and larva inside.
Need to use antenna more often! Have fun out there in Elecraft land,
John KN5L
Covered in ARRL FD FAQ:
http://www.arrl.org/files/file/Field-Day/2019/2019-FD-FAQ-RevA.pdf
convenient backyard operations on property of home stations remain
either Class D (commercial power) or Class E (emergency power), even if
home antenna structures are not used
John KN5L
On 6/25/19 1:52
t to "KX3 Optimal" in:
https://www.kn5l.net/KX3-TxEq/
John KN5L
On 6/20/19 8:38 AM, John Oppenheimer wrote:
> Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
>
> https://www.kn5l.net/ssbpower/
>
> Q
nal for acoustic measurements.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
>> On Jun 20, 2019, at 10:34 AM, John Oppenheimer wrote:
>>
>> Hi Don,
>>
>>> On 6/20/19 9:21 AM, Don Wilhelm wrote:
>>> John,
>>>
>>> That connecti
a1-12.pdf
>
>
> 73
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
> On Jun 20, 2019, at 8:38 AM, John Oppenheimer <mailto:j...@kn5l.net>> wrote:
>
>> Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
>>
>> https://www.kn5l.net
for oscilloscope average RF measurement at
each digitized point during long, six second, trace. This will result
with increased accuracy when measuring modulated speech.
John KN5L
> On 6/20/2019 9:38 AM, John Oppenheimer wrote:
>> Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
https://www.kn5l.net/ssbpower/
Question, is this technique correct?
John KN5L
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On 6/11/19 3:34 PM, George Pasek wrote:
> as if there was a series diode involved with the display voltmeter.
Hi George,
KKX3 uses a series Schottky doide for reverse voltage protection. The
KX3 displays voltage after the diode.
John KN5L
And easy on a battery for field operation, < 400mA Receive and optimal
PA biasing for efficient for 5W and 20W to 50W operation.
John KN5L
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TJ, your six miles line of sight, what to come by and borrow it for a
while to see if it's a fix?
John KN5L
On 4/28/19 12:11 PM, John Oppenheimer wrote:
> Nice!! A Begali Intrepid,
>
> All bugs will have contact bounce. K3 does not handle them well at all,
> same for KX3/2. K2
Nice!! A Begali Intrepid,
All bugs will have contact bounce. K3 does not handle them well at all,
same for KX3/2. K2 is much more tolerant. Though normally for the dot side.
I fixed it with a home-brew debouncer:
https://www.kn5l.net/debounce555/
Others cam be found on the WWW. It was fun
Took a look at Heath's HW-16 design. Quite ingenious: Using the PA
cathode bypass capacitors and current through a diode to shunt the
receiver front end during transmit. Early diode QSK operation. And a
neon bulb relaxation oscillator, using grid block keying voltage, for CW
sidetone.
I enjoy
On 1/13/19 11:24 PM, Jim Brown wrote:
>> The instrument used to measure this is quite simple.
> I'd be very interested in how you're measuring the current at the
> antenna feedpoint. :) That is NOT so simple.
The common mode current can be measured 1/2 wavelength from the
feedpoint. Here is an
is three time the copper loss, the #22 vinyl
loss is two times the copper loss.
John KN5L
On 12/18/18 8:46 PM, John Oppenheimer wrote:
> There were some comments about speaker loss and the contribution of loss
> as a result of vinyl dielectric. A way to evaluate is to measure a
> length of spe
There were some comments about speaker loss and the contribution of loss
as a result of vinyl dielectric. A way to evaluate is to measure a
length of speaker wire and compare to an air dielectric equivalent. Here
is an example:
https://www.kn5l.net/SpeakerWire/
The Air dielectric equivalent
oss for #12 is 0.47 dB/100. For the
Teflon, that would leave 0.47 dB for dielectric loss. This is sounding
closer.
John KN5L
> On 12/17/2018 12:58 PM, John Oppenheimer wrote:
>> On 12/17/18 1:58 PM, Jim Brown wrote:
>>> In order of loss at dB/100 ft at 10 MHz from low to high, the
>
On 12/17/18 1:58 PM, Jim Brown wrote:
> In order of loss at dB/100 ft at 10 MHz from low to high, the
> Teflon #12 is lowest at 0.94dB, then RG400 at 1.22 dB (about the same as
> RG58), then #12 THHN at 1.34 dB. #12 or #10 enameled copper had the
> greatest loss, 2.4 dB/100 ft.
Hi Jim,
Two
Hi Dick,
The Elecraft list does not accept attachments. Send to me directly.
John KN5L
On 12/2/18 4:14 PM, Dick Dickinson wrote:
> Hi John,
>
> Per your suggestion, I ran a sweep of my 40 meter vertical with the K3 /
> K3EZ software.
>
> I then measured at ~20 kHz steps with my MFJ-259B.
>
Hi Dick,
An EZNEC and SimSmith model of the on ground 1/4 wave vertical:
https://www.kn5l.net/images/SS-KA5KKT-vertical.png
SimSmith R1 represents ground loss, the value set to establish a 50 ohm
load at the transmitter, G in SimSmith.
According to the models, the 7 to 7.3 MHz SWR is a little
Hi Dick,
An EZNEC and SimSmith model of the on ground 1/4 wave vertical:
https://www.kn5l.net/images/SS-KA5KKT-vertical.png
SimSmith R1 represents ground loss, the value set to establish a 50 ohm
load at the transmitter, G in SimSmith.
According to the models, the 7 to 7.3 MHz SWR is a little
Hi Dick,
Some numbers: using the K3 Schematic, "K3S RF Board" Sheet 2, Section
B1. The power meter uses a series Schottky diode detector. The low
reasonable resolution is about 0.3 VDC, or 0.3 * .707 = 0.21 Vrms out of
the directional coupler.
The Power for 0.21 Vrms is:
0.21^2 / 50 = .88 mW
e is a new "S3" line in the K2 plot to
demonstrate where the phase noise is an issue, about 12 dB below S3, or
S1 signals. Don't know about others, but the noise floor of my antennas
is well above S1, closer to S3 on a good day.
John KN5L
On 10/29/2018 08:38 AM, John Oppenheimer wrote:
While evaluating a receiver design, a K2 Narrow Spaced Dynamic Range
measurement was performed to validate the test bench. The K2 plot is on
the page: https://www.kn5l.net/newReceiverProject/plot-IMD/
If the two line equations are used, the Noise floor is -138 dBm and 2kHz
dynamic range is 87 dB.
On 09/02/2018 07:56 AM, Don Wilhelm wrote:
> That W3EDP antenna is a strong suspect, as is any off-center fed antenna
> or end fed antenna. They can produce large amounts of RF in the shack.
Hi Gwen,
Don is correct. The W3EDP with a large choke Balun, as pictured, between
the Unun and KX3 is
On 07/03/2018 04:21 PM, w2bvh wrote:
> The MDS problem is now apparently fixed!
Great news Lenny! I got interested and spent the afternoon measuring my
K2. Once having the results, I had to send them! And wanted to test my
new test equipment.
The K2 is an amazing radio. I'm glad that the
On 07/02/2018 01:22 PM, w2bvh wrote:
> _XFil BW Hz) MDS (dBm)
> _400 -125
Measured K2; 14 MHz with 400 Hz BW using XG3 and Fluke 87V (True RMS
with averaging mode). With full AF gain, the two -107 dBm / off voltages
were 322.3 mV and 12.5 mV, =>
Hi Lenny,
In the past I've used the "Measuring Receiver Sensitivity" found in the
XG3 manual:
http://www.elecraft.com/manual/E740154%20XG3%20Owner%27s%20Manual.pdf
to be rather close to published K2 numbers.
John KN5L
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Here is a picture and some plot images:
http://www.kn5l.net/Elecraft/CP1/
Not super accurate 60 and 100 Ohm loads, but provides an insight of the
coupler operation.
John KN5L
On 06/22/2018 04:15 PM, Wes Stewart wrote:
> I don't quite understand your methodology but there is one, apparently
Putting the Elecraft CP1 through the paces with a 2 port VNA can be
enlightening. The CP1 seems to be representative of Elecraft directional
couplers across the line. There's a picture of the W2 high power HF
coupler in the manual, it's just larger cores.
Sweeping a 20 dB CP1 across the band with
Hi Scott,
I wonder how the linearity of the two power meters was evaluated?
Some years ago I checked the K3 and KX3 power meter against two other
meters. They were just within 10%
http://www.kn5l.net/Elecraft/Power.html
John KN5L
On 06/19/2018 04:56 PM, K9MA wrote:
> I just repeated the
.
>
> 73
>
> Bob, K4TAX
>
> On 6/17/2018 7:07 AM, John Oppenheimer wrote:
>> Hi Martin,
>>
>> The power ramp up is normal behavior. The K2 uses requested power
>> control (Page 92, "Requested vs. Actual Power:" paragraph)
>>
>> With a
Hi Martin,
The power ramp up is normal behavior. The K2 uses requested power
control (Page 92, "Requested vs. Actual Power:" paragraph)
With a per band set value (Page 111, "Microcontroller" paragraph, "ALC,
which is used on CW to maintain the user-specified power level across
all bands.")
When
Hi Mike,
An EZNEC model using 30 feet AGL and Q=200 for the coils, has a very
close match the the reported values.
20M, the antenna does not seem to degrade form a simple dipole with a
Gain of about 6 dBi at about 30 degrees elevation.
80M, it's about 5 dBi at 90 degrees elevation. Expected
I was inspired by Wayne's announcement to setup outside on my back
porch. I decided that Morse code is Morse code independent of the key
and used a memory keyer and Vibroplex Iambic key.
The weather in Texas was wonderful!
Calling CQ resulted with several QSOs. It was a fun day.
The setup:
Hi Ed,
The KX3 specification rates the key line at: "Accessory I/O (ACC2 Jack)
KEYLINE: 30 V, 100 mA max, open drain;" on page 54.
The amplifier should also have a specification. As long as the amp is
under 30V and 100 ma, all will be OK with a direct connection. If the
amp does not have a
Thank you Jan!
Also a thank you to the private direct reports.
I'm in a temporary limited shack condition. To KIS, using a K2/10 with a
battery. While sending an endless string of auto-keyer 10W CQs on 20M my
mind wondered to: what is the addition battery drain for 3 dB?
Testing a K3, the bias
Hi KXPA100 users,
Can you report the DC input current at 20 and 50 output watts? Actual
measurements will be most helpful.
John KN5L
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The discussion about old coax reminded me of a recent acquisition. A
couple of weeks ago I went through my old childhood home in FL, just
before it was sold, to look for "stuff" from the past. The property had
a shed, which predated our home, which had old radio stuff in it when I
was young.
The SARK 110 is very small with many features:
http://www.sark110.com/
John KN5L
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Used the new FW during my early morning 40M CW session. Used KX2 #80
with external LiFePO4 battery and inline W1 Power Meter. Antenna SWR =
1.3. The W1 12W LED does turn on. Measured DL1 power is 11.8 watts.
Ambient operating temperature was 22 C.
Sent many CQs before receiving an answer. Had two
Hi Elecraft list,
I've had a KX3 for over five years, never installed internal batteries,
never plan to.
I miss having a builtin clock. Sure would be nice to have a RTC board
option, no charging circuitry, with a button cell to maintain clock
time. And FW access to the time correction registers
Hi Stan:
Post ten.
There are two ways to approach this, just put something up, or measure
and optimize. When using the KX3 ATU, both methods will provide similar
results.
An 88 foot Doublet and feedline is modeled using EZNEC and SimSmith. The
results found here:
http://www.kn5l.net/Doublet88/
May find some information about the issue here:
http://adslm.dohrenburg.net/uverse/
It will depend on which VSDL frequency is being used by the modem. My
modem seemed to pick the high end of 40 meters most of the time.
John KN5L
On 08/25/2017 09:16 PM, Jim Brown wrote:
> I can't think of a
Hi Mike,
Did you replace the uVerse modem recently? I had the same 40M problem
after replacing the modem. Google the issue, I believe you'll find
similar experiences.
John KN5L
On 08/25/2017 05:24 PM, Mike Pilgrim wrote:
> have TVI in my u-Verse TVs when using the
> K3 on 40 meters
Hi Phil,
Yes there is a little difference.
One standard for WPM can be found in:
https://en.wikipedia.org/wiki/Morse_code
as T = 1200 / W or WPM = 1200 / T
Where T is dot duration in mS.
To remove weighting, using an oscilloscope to measure Dot and Space
time. The keyer is using the
Hi Scott,
Measuring the KX2 DOT period with KYR-SP set to 32 WPM is 34.6 ms. Which
equates to 34.7 WPM.
KX2 #80
John KN5L
On 08/02/2017 12:49 PM, K9MA wrote:
> According to the RBN reports, my KX2 seems to send about 2 wpm faster
> than the set speed, like 34 vs 32. Has anyone else noticed
This is the response I received from Elecraft support:
On 06/27/2017 01:34 PM, Elecraft Support wrote:
> To your question, yes, we are now using a drop of Locktite Blue (not
> Red) on the threads for the 2 screws that hold the round contacts in
> place.
John KN5L
On 07/24/2017 10:45 AM, KENT
On 06/19/2017 10:41 AM, Wayne Burdick wrote:
> - Running from a lower supply voltage (e.g., the 11 V internal battery)
> should reduce power dissipation
With external 13.8V input, power lowered to 5W at 3 minutes 48 seconds.
With internal battery, at 8 minutes, the PA temperature was 60C.
On 06/19/2017 10:41 AM, Wayne Burdick wrote:
> - Running from a lower supply voltage (e.g., the 11 V internal battery)
> should reduce power dissipation
This is counter to what I had thought! But:
With external 13.8V input, power lowered to 5W at 3 minutes 48 seconds.
With internal battery, I
Hi Linas,
My KX2 dropped from 10W to 5W at 3 minutes 48 seconds of key down,
starting at 25C.
John KN5L
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Post:
Hi Wayne,
Testing the new logging feature in 2.77. A couple of suggestions:
When dumping the log using LG; can the dump stop after dumping the last
valid character, rather then a long string of "---" ?
Can the memory keyer operations be logged. Maybe just a M# or some other
character string
Hi Wayne,
I'd like a change which sets seconds to zero when tapping the 3 button?
John KN5L
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Post:
501 ladder line #18 solid CCS copper thickness is 0.0717 mm
http://copperweld.com/sites/copperweld.com/files/w30ccs-ed5230.pdf
RF skin saturation is well below 1 MHz using the calculator:
http://owenduffy.net/calc/SkinDepth.htm
551 is #18, 19/30 stranded, #30 CCS copper thickness is 0.0178 mm
Wireman 553 uses a 19 strand Copper Clad Steal (CCS) conductor which
results with very thin copper cladding. 553 is skin saturated at about
15 MHz. The loss at 1.8 MHz is approximately 0.21 dB per 100 feet.
http://www.kn5l.net/wm553/
Using EZNEC and SimSmith for the antenna below results with
A K3/P3 can be used to measure the KX3 SSB TX bandpass. The process is
to speak random words for several seconds while monitoring with a P3 in
"Peak" mode. After about 30 seconds the display will stabilize.
The K3 filter width is 2.1 KHz 350 - 2450
Here are some measurements:
The Heil site as some suggestions here:
https://www.heilsound.com/amateur/support/dsp-settings/all-things-elecraft
Using a K3/P3 to measure the response curve, I use:
-16 -16 -16 -2 +3 +9 +16 +8
John KN5L
On 11/09/2016 03:28 PM, k4mmg@gmail.com wrote:
> Any suggestions on what EQ settings
Hi Barry,
The tuner will have negligible compared to the transmission line
miss-match loss.
Take a look at the KX3 list messages:
https://groups.yahoo.com/neo/groups/KX3/conversations/messages/60190
https://groups.yahoo.com/neo/groups/KX3/conversations/messages/60192
John KN5L
On 11/03/2016
Using the DISP voltage, using internal battery, receive is 11.7V and 10W
in TUNE is 10.8V. a drop of 0.9V. The receive drop is a tenth or two, or
round down to a 1V total voltage drop during 10W transmit. The minimum
battery voltage would then be 11V or 3.67V per cell. Looking at
representative
Hi Paul,
There is a procedure for estimating MDS documented in the XG3 manual,
the "Measuring Receiver Sensitivity" section:
http://www.elecraft.com/manual/E740154%20XG3%20Owner%27s%20Manual%20Rev%20D2%20-%20ECO%2001887.pdf
I've performed this test and found my K2 to have a reasonable match.
Hi Wayne,
Sure would be nice if while in TIME MENU, pushing "3" would set seconds
to zero. This would make it much easier to hack to WWV. Or to maintain
backwards compatibility, program "4" as a seconds hack button.
John KN5L
KX2 #80
__
6 uH
>
> C: 1360, 680, 330, 164, 82, 39, 18, 10 pF
John KN5L
On 07/25/2016 04:36 PM, John Oppenheimer wrote:
> The command is:
> AK (ATU Network Values; KX3/KX2 only, GET only)
>
> Programmer's Reference Page 3.
>
> The KX3 L and C values can be found from the schemat
The command is:
AK (ATU Network Values; KX3/KX2 only, GET only)
Programmer's Reference Page 3.
The KX3 L and C values can be found from the schematic. Wayne sent an
email some years ago with the list of L can C values.
I don't believe that the KX2 L and C values have been published.
John KN5L
Hi All,
Here is a link to a schematic for the 3/4 A power supplies with the
added parts for external voltage protection:
http://www.ameradio.com/doc/Astron%20RS-3A,%20RS-4A%20schematic.pdf
John KN5L
On 07/21/2016 07:41 AM, Myron Schaffer wrote:
> It used to be that waythe RS linear models
Can the FIL default display "FIL ADJ" be replaced with the current
setting? This change will allow viewing the BW without the need to tune
the BW.
Using MCU 2.66 / DSP 1.48
John KN5L
__
Elecraft mailing list
Home:
My general operating style is to use a CW memory REPEAT for sending CQ,
both at home and during field operations.
I sure would be nice to end the memory with a tap of the key and not
send an element. Both my new KX2 and KX3.
John KN5L
On 05/30/2016 06:27 PM, Jim Rodenkirch wrote:
> Could
Thank you Ed, this is the answer I've been waiting for:
John KN5L
On 05/20/2016 11:10 PM, Ed Muns wrote:
> I have been using a Begali Adventurer Mono on my KX2 SN 20 for several weeks
> now with no problem. The screws look short enough and are not anywhere
> close to the PCB.
>
> This morning
I performed some additional research, Johnny, VR2XMC, measured TP1 V at
4.82 back in December 2006. Maybe the 4.5 is a typo and should be 4.8:
http://elecraft.365791.n2.nabble.com/some-questions-of-W1-td442330.html
John KN5L
On 12/31/2015 06:22 AM, John Oppenheimer wrote:
> Hi Ed.
>
>
Hi Ed.
The W1 DC voltage calibration resulted with incorrect reading with my
W1. My hunch is that components have changed since Elecraft established
the TP1 DC calibration voltage almost a decade ago.
I have a KX3F with unchanged factory power calibration. Based on
comments from Wayne, the KX3
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