It's so the roofing filter option can be used (using weaver demodulation).
73 de Matt VK2RQ
> On 10 Sep 2017, at 1:39 pm, K9MA wrote:
>
>> On 9/9/2017 22:13, Don Wilhelm wrote:
>> The KX2/3 does not convert directly to audio.
>> It converts the RF to "baseband" which is a zero frequency IF (in
Good evening,
The sun has been pretty active this week. Repeated solar flares have
raised the solar flux to 129 and higher. The auroral oval has calmed to
where it's not radiating much noise. A few days back it was very loud
here. Propagation should be favorable tomorrow.
Some much nee
On 9/9/2017 22:13, Don Wilhelm wrote:
The KX2/3 does not convert directly to audio.
It converts the RF to "baseband" which is a zero frequency IF (in the
KX3). The KX2 has the "8kHz shift" built in at all times, so the IF
is 8kHz rather than baseband.
The KX3 can shift to the 8kHz IF if there
Right, the amplitude of the signal is just the length of the I/Q vector,
which is sqrt(I^2 + Q^2). If the receiver is a little off-frequency,
the I/Q vector rotates (because the phase is constantly changing) but
the amplitude is still just the length of the vector.
Alan N1AL
On 09/09/2017 0
Never mind: I think I found the answer:
https://www.tjhsst.edu/~rlatimer/techlab/Gelbpaper04.pdf
(The explanation isn't that clear, but I worked through the trig a bit
more rigorously, and got the same answer.)
Basically, the modulating signal, m, is the square root of the sum of
the square
Scott,
The KX2/3 does not convert directly to audio.
It converts the RF to "baseband" which is a zero frequency IF (in the
KX3). The KX2 has the "8kHz shift" built in at all times, so the IF is
8kHz rather than baseband.
The KX3 can shift to the 8kHz IF if there is breakthrough of AM
broadcas
Scott,
The KX2/3 is not a direct conversion receiver/transmitter.
Instead, it has a quadrature mixer which converts the incoming RF into
baseband (or 8kHz IF) I/Q streams which is then sent to analog to
digital converter. The output of the A to D converter is a 'bunch of
bits', which can be m
On 9/9/2017 21:35, Fred Jensen wrote:
A DC receiver converts the signal once to audio. Regardless of the
mechanics [which these days can get very complex], that's really all
there is.
Ah, but the only way direct conversion can convert AM to audio, without
some kind of fancy DSP stuff, is to
A superhet converts the signal to an intermediate frequency [455 KHz?].
Sometimes it does it more than once, 2 or more IF's, many today have a
very high frequency first IF [70+ Mhz].
A DC receiver converts the signal once to audio. Regardless of the
mechanics [which these days can get very
Is the paddle port set to "Hand key"?
Sent from my iPhone
...nr4c. bill
> On Sep 9, 2017, at 4:04 PM, Don Butler wrote:
>
> I think he may be saying that when the KXPD3 is fully inserted the rig goes
> into transmit but it works properly when it is pulled out a little ...
>
> -Origin
It's been a long time since I studied signal theory in college, but I'm
curious as to how AM is demodulated in a direct conversion radio like
the KX2/3. (SSB and CW demodulation I understand.) Does anyone know, or
have a reference?
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
__
I switched to gas, and mu bill went from around 200 bucks a month for
electric to about 80 in winter... Also my Honda eu2000i now runs the
heater.
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On 09/09/2017 03:00 PM, Ron D'Eau Claire wrote:
Perhaps it is saying the obvious, but when consider
Here I am running the house with a 3000 watt Honda. We use wood heat
primarily so the furnace is no issue. I don't worry about the water
heater or kitchen stove. The microwave is on the transfer switch. The
transfer switch is a manually operated with a dozen circuits.
Ken WA8JXM
On 9/
Thanks Bret, glad you found success.
This note is information to all who are using any soundcard digital modes.
This is a situation of having too many controls that do the same thing
(adjust the audio level). There are 2 in the computer - soundcard
"speaker" level and the WSJT-X "power level".
Thanks to all who offered suggestions. Rather than many individual replies, I'll
just add further comments here.
The SS-USB-100 USB-to-Serial converter (Prolific chipset) is definitely bad. As
I said it worked fine before but is flaky now.
With the Edgeport 4-port, FT8 works fine and I can co
KX2 firmware rev. 2.79 has several minor improvements, including:
- CW sidetone volume can be set much lower
- Auto-power-off timer range is now 5 to 100 minutes (was 3-20 minutes)
- Filter bandwidth settings modified to prevent degradation of opposite
sideband suppression
All of these changes
That seemed to do the trick Don. Edging the WSJT-X Power Slider down to
mid-scale and K3S MIC LINE IN to ~30 gave me the wiggle room to get the 5th
bar flashing. In fact, flashing just a bit was less effective than flashing
a lot, but still short of solid 5th bar ON. But I guess the 5th bar flash
I just treated myself to a pair of SP3s, and I find them very nice speakers.
Easy to configure on my K3S and the position to L/R ends of the Elecraft row
of P3/K3S/KPA500 give a good stereo effect.
Bret/N4SRN
--
Sent from: http://elecraft.365791.n2.nabble.com/
__
If that is what was being stated, I did not understand
"sends" equals "the paddles send OK".
If the KX2 is going into full transmit, there is a problem, contact
support for assistance.
73,
Don W3FPR
On 9/9/2017 4:04 PM, Don Butler wrote:
I think he may be saying that when the KXPD3 is fully
Yes, Mine is a manual transfer at the mains, I have a night lite on the
commercial side to tell me their power is back on.
Mel, K6KBE
From: Richard Fjeld
To: "Charlie T, K3ICH" ; "elecraft@mailman.qth.net"
Sent: Saturday, September 9, 2017 2:53 PM
Subject: Re: [Elecraft] OT: Whol
Perhaps it is saying the obvious, but when considering the power
requirements of a home determine how it is heated. Here in Oregon, in the
land served by the Bonneville Hydroelectric dam, a great many homes like
mine are heated electrically. We have a forced air system that employs 3
electric "burn
Charlie,
The bottom paragraph of your post caught my eye.
Transfer switch type can depend upon a generator’s locale. I have seen
outdoor generators hard packed with snow internally. I feel better about
examining things before start-up. So for home use, I favor manual control.
With a manual
On 9/9/2017 10:43 AM, Doug Hensley wrote:
I'm was pleased to hear K3, K3S & KX3 owners consistently reporting whatever
hash their units were producing had no ill effects on their Elecraft radios during
the period their generator was running.
It is quite common for generators to produce RF noi
I think he may be saying that when the KXPD3 is fully inserted the rig goes
into transmit but it works properly when it is pulled out a little ...
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Saturda
John,
I am an owner of kx2 for a few years. I am amazed by the quality of the kx2
speaker. For such a tiny radio with so little space for a speaker , it is a
very well designed construction of the back cover of the radio and the
speaker itself!
73 de Linas LY2H
On Fri, Sep 8, 2017 at 4:43 AM, John
Ignacy,
I have no idea why you would want to operate it when not fully inserted
and the securing screws tightened.
It does not sound to me as though you have a problem.
73,
Don W3FPR
On 9/9/2017 3:02 PM, Ignacy wrote:
KXPD3 worked well until last week (ES/NO9E). Now as Z3/NO9E, KXPD3 sends w
I have a 20KW Generac here at the house and a 22KW Generac at the farm both
with AUTO-transfer switches. The 20KW here at the house is Natural Gas and the
one at the farm is Propane. I have noticed no issues at either location
concerning radio gear.
Ed.. AB4IQ
-Original Message-
From
Don’t forget break before make transfer switches. These provide for complete
disconnect from one feed for a brief period before connecting to the other.
73 de na6m
On 9/9/17, 2:02 PM, "Dr. William J. Schmidt" wrote:
Well there can be a little more to it. With the larger systems there is
I solved this issue by changing out the power feeds to both my gas
heater, and gas hot water heater with AC line pigtails.
I just unplug the two devices from the AC mains, and plug them into the
generator output lines. I changed my stove to gas, so when there is a
power fail, I run everything
KXPD3 worked well until last week (ES/NO9E). Now as Z3/NO9E, KXPD3 sends when
fully inserted. When partially inserted, it works OK. It seems that the
bottom pins in KX3 are a bit lower and the top ones are a bit recessed. But
perhaps it was always that way.
I tried to open and close the KX3 and no
Well there can be a little more to it. With the larger systems there is phasing
circuitry (in the generator or the transfer switch: i have both) to detect and
switch at zero cross-over point for "bumpless" transfer of power. Causes the
least amount of surge and damage.
Dr. William J. Schmid
It's Generac "Synergy" not syntergy
And yes, they just came out with them as their own version of the inverter
type generator.
I've only seen it listed on a few of their dealers so far.
There's nothing magic about wiring a transfer switch. In the larger systems
of about 7 - 8 kW and higher, think
Thank You Don and others who replied directly!
I checked those resistors to be correct value. This K2 is >3000, so 100
ohms on R60. Then I continued with PA transistor installation. K2 works
now, a bit low output on 20 and up. Low bands easily ten watts. I will
check BPF tuning later.
After I wil
Someone on the list suggested we post a summary of private responses to us as
an alternative, I'm guessing, to members not knowing what was said. In my
case, the results don't lend themselves to a simple summary so I am sending
this as a fair response to what I learned:
1. I'm quite surp
Bob & Don,
Thanks for the clarification. Apparently
I've always looked at the LP-100A when
tuning as I didn't recall that behavior
and it struck me. I'll have to re-read the
manual, I didn't find SWR mentioned on
page 6 but I've missed things before.
Thank you for the help! 73,
Gary
KA1J
>
My current shack speakers need replacing and I read about the SP3s.
Aesthetically, no question they are nice and I'm impressed Elecraft
contracted a specialist to design them. I don't take the K3 anywhere -
just K1! - so ruggedness is not a need.
In such a situation have any here bought SP3s
My testing with WSJT-X (FT8) "tune" for an audio tone, says that any ALC
indication at all, no matter where it is, gives exactly the same RF output.
That said, _and this may only apply to my situation, _the signal is cleaner with
only three bars lit. I'm seeing 52 Hz spurs at -50 dBc for anythi
Gary,
How are you initiating transmit?
That is normal if you are using TUNE.
If you are tapping XMIT or closing the Key or closing PTT, the frequency
should be displayed.
73,
Don W3FPR
On 9/9/2017 3:01 AM, Gary Smith wrote:
I just changed the configuration to power
per band and now when I tr
The VFO A display shows the SWR in tune mode. See page 6.
--
Sent from: http://elecraft.365791.n2.nabble.com/
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Post:
How about using the mouse scroll wheel, it adjusts the power in 0.1dB
steps. At least it does on my Win7 box.
The waterfall sliders also respond to the scroll wheel.
Regards,
Mike VP8NO
On 08/09/2017 21:52, Bob McGraw K4TAX wrote:
As an operational note for WSJT-X. Version 1.8.0 -rc2
To ad
I just changed the configuration to power
per band and now when I transmit it shows
the numerical value of the SWR instead of
the VFO A frequency. I must have
accidentally engaged a command while
bumping something, looking for PWR SET.
Say the frequency showing on VFO-A is
10.11 If I use
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