http://www.sherweng.com/table.html
The LO Noise (dBc/Hz):
144 KX3
138 K3
130 R390A
121 FT-1000D
117 ICOM 720A
I'm wondering why the KX3 Lo noise is so much better than the K3.
The R390A value strange since the first local oscillator is a quartz
crystal.
I've owned a Icom 720A and own a
Can anyone really hear the difference between any of the top rated rigs
(Sherwood list) in the real world (not in a lab)?
Bill K-Line
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Yes, when your neighbours FTDX5000 at 300 metres away spews noise over
three adjacent bands. Compounded by idling the FT and making up the
power with an amp which only makes the problem worse by another 15dB.
Adjacent bands are clear when a Dunestar BPF filter inserted between his
FT and amp.
The FTdx5000 does that in RX mode? Nasty! :-)
Phil W7OX
On 4/2/14, 7:17 AM, Mike Harris wrote:
Yes, when your neighbours FTDX5000 at 300 metres
away spews noise over three adjacent bands.
Compounded by idling the FT and making up the
power with an amp which only makes the problem
worse by
It's easy to demonstrate this. My real-world setting is Field Day,
and the example is actually what my team experienced.
Take four rigs in a Field Day setting, within 100 yards of each other.
Make sure one of them is a K3, and the others are Y/K/I types.
On the same band, any of the Y/K/I rigs
The K3 and KX3 both have very low phase noise. It can vary a bit from band to
band and from one unit to the next. Sherwood measured one example of each, but
typically both measure right around -140 dBc/Hz at 20 kHz.
When we designed the K3, we were trying to improve on the phase noise numbers
Not that I know of, but when it transmits, it wipes out nearby receivers.
73,
Don W3FPR
On 4/2/2014 10:55 AM, Phil Wheeler wrote:
The FTdx5000 does that in RX mode? Nasty! :-)
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That is why I try to encourage the local Field Day group to use only
Elecraft gear. Even though we do not typically operate more than one
transceiver on a single band, the YKI types can cause problems on other
harmonically related bands. We used to have a Yaesu FT-900 on SSB, and
it caused
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Like Don said, not in receive, but in transmit, driving an Alpha 9500 to the
full 1500 out, a close neighbor (about 5 blocks away) was noticeable on my K3
within 5-10 KHz of his transmit frequency. That said, the FTdx5000 was MUCH
cleaner than the FT-1000MP he had prior to obtaining the 5000.
I agree, Matt, and every rig I use now is an
Elecraft (K3, KX3, K2, ...).
But the question the OP posed was K3 vs. KX3: I'm
wondering why the KX3 Lo noise is so much better
than the K3
73, Phil W7OX
On 4/2/14, 8:06 AM, Matt Zilmer wrote:
It's easy to demonstrate this. My real-world
There was some discussion about the effects when on receive as well, I seem
to think another manufacturer, not Electraft and not one of the 'big 3' was
shown to be quite poor with it's radiated signals even on receive. Or, did
I read the lab reports incorrectly?
Dave (G0DJA)
- Original
The K2 is listed in the Sherwood Engineering table. Follow the link in the
original post on LO noise.
wunder
--
Walter Underwood
K6WRU
CM87wj
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You may be thinking of reciprocal mixing, a measure of receiver performance
that is impacted by synthesizer phase noise, spurs, etc.
Wayne
N6KR
On Apr 2, 2014, at 8:48 AM, Dave d...@g0dja.co.uk wrote:
There was some discussion about the effects when on receive as well, I seem
to think
Phase noise is very important on receive. If your L.O. has a high phase
noise content, the phase noise will mix with signals away from the L.O.
and bring those signals into your filter bandwidth as noise. This is
called reciprocal mixing and is essentially as described below. If you
want a
Walter,
I built a K2 for FD a number of years ago. It was a wonderful FD
rig. I was operating QRP CW with a group in my radio club. It fared very
well and outperformed the FT-817 and a few other portables. It got down
to operator skill when comparing the K1 and K2 FD operation.
I no
I use the sticky back Velcro to hold my Garmin GPSIII+ to the dashboard
of my truck, and I used a little bit to hold a muffin fan on top of my
K2/100 for RTTY before I sold the KPA100.
I was having a continuous problem with the K3 moving around when I tried
to tap or hold the switches, and I
I think Bill's question spoke to phase-noise on receive, not transmit.
I'm fairly certain all of us are aware of the transmit problem from some
transceivers.
To Bill's question, I'd say No, I cannot hear the difference when the
measured noise is in the -135to -140 range, other noise sources
That's a silly comment. Last time I checked, people nearby a trashy
transmitter have to listen as well. They didn't create no smoking rules
in public places to protect smokers from their own smoke.
Dave AB7E
On 4/2/2014 7:55 AM, Phil Wheeler wrote:
The FTdx5000 does that in RX mode?
The KX3 isn't perfect. During SOTA activations, Gary W5ODS and I each use a
KX3, with the roofing filter option. He with an end-fed wire, and me
usually with an AlexLoop. I can often hear his code (a pink noise sound)
even when he is in a band higher in frequency, as well as when I am in a
higher
Better hope there's no Flex's transmitting too close to your location
either.
Chas
, Bill W2BLC wrote:
Can anyone really hear the difference between any of the top rated rigs
(Sherwood list) in the real world (not in a lab)?
Bill K-Line
Apologies if this has been mentioned before...
One of the things I _/really/_ love about the KX3 is the stereo panning
of CW signals low to high pitch. It makes reading CW so much easier
especially during contests.
Is there any chance that feature can be incorporated into the K3's
firmware
Did you turn on RX ISO? That is an isolation preamp that reduces LO leakage
during receive. That sounds like a different problem that you are hearing, but
it is recommended when you are operating a KX3 near other rigs.
wunder
K6WRU
On Apr 2, 2014, at 9:40 AM, Chip Stratton
Why does the ARRL lab test show the KX3 TX phase noise as about -124
dBc/Hz (Fig 5 of their report) and Sherwood show this as -144 dBc/Hz,
both at 10 kHz spacing? That is a huge difference.
The ARRL report shows that the KX3 never goes below about -135 dBc/Hz,
even 1 MHz away.
Is there an
Thank you Fred K6DGW - you are correct - I was referring to phase noise
on RX.
So far as noise from XMIT on other rigs, I have no experience. I live in
a rural area and have an extremely low ambient noise level. A noisy RX
exposes itself immediately.
As I recall, the quietest rig I ever had
No! And I have them all. My TenTec Eagle hears as good as my FT5K and our
beloved K3 and KX3
George, W6GF
On Wednesday, April 2, 2014 10:02 AM, Charlie T, K3ICH pin...@erols.com
wrote:
Better hope there's no Flex's transmitting too close to your location
either.
Chas
, Bill W2BLC
First of all, the ARRL is showing (as you note) transmitted phase noise. Rob
lists receiver phase noise. Ideally, they should be the same, but are they really?
Second, there can be significant test sample variation and variation between
phase noise test sets.*
Third, phase noise
An alternative to ladder line is running two parallel runs of coax
(RG-213) with only center conductors connected to the loop and the
radio end center conductors to a balun which solves the unbalanced
issue. The two runs of coax can be taped together.
Two runs of coax will have something
The Sherwood list ranking isn’t about how well radios “hear” in general. Under
the right conditions, most of the radios on the last (and a whole lot of radios
that aren’t) can hear everything our most beloved radio (whatever that is)
hears. The list is ranked in order of decreasing narrow
Larry,
Not knowing much about the R390A, but Sherwood ranks it very low in
phase noise. Xtal oscillators are easier to design with low phase
noise than synthesizers. This is primarily why later radios have a
problem with noise as most use synthesized LO's, and why the old
radios with xtal
I get an bat Err message if I want to charge my battery pack on the KX3.
The battery (NiMh) seems to be very low, as the KX3 doesn't start with
them. The LEDs light up shortly then nothing.
But if powered externally, I'd expect I get my battery recharged.
What can I do?
Tnx,
Gernot, DF5RF
Our field day has been all Elecraft for the last couple of years
with mostly K3s and a scattering of K2s. Last year we ran 9A QRP
battery + GOTA (+ satellite). We had antennas which allowed us
to run CW, SSB and Digital on the same band and had no
significant mutual interference. (We work hard
I have a very good condition used Clifton Laboratories Z90 panadapter,
with the complete set of running spares available for sale. This Z90
was owned by a customer who is, for medical reasons, no longer able to
enjoy ham radio and has asked me to see if it can be put to good use.
For those
Not if one or more cells are damaged and/or too low in voltage.
Sent from my iPhone
...nr4c. bill
On Apr 2, 2014, at 3:50 PM, g...@gmx.net wrote:
I get an bat Err message if I want to charge my battery pack on the KX3.
The battery (NiMh) seems to be very low, as the KX3 doesn't start with
I have a K3 / P3 / SteppIR SDA100. Everything is set to 38400 baud. I
have connected a Y-cable to the RS232 connection on the K3. One side of
the Y is connected to the SteppIR controller with a null modem inserted
(as directed by SteppIR instructions). The other side is connected to
the
It will recharge only if you have that option, the external voltage is high
enough and you set it to recharge in the menu.
Phil - Sent from my iPad
On Apr 2, 2014, at 12:50, g...@gmx.net wrote:
I get an bat Err message if I want to charge my battery pack on the KX3.
The battery (NiMh)
On 4/2/2014 1:42 PM, Bill Frantz wrote:
The bigest interference problem was phase noise from another club's
operation about 1/2 mile away. They were running 100 watts with I-K-Y
gear.
My biggest problem is from a retired east coast lawyer 8 miles from me
who runs an ICOM 7600 to a solid
I suspect that the problem is that you have two transmitters on the RS232
circuit. Maybe you can find some help in this similar situation.
http://elecraft.365791.n2.nabble.com/K3-Edgeport-Adapter-with-K3-and-SteppIR-td4819889.html
David K0LUM
On Apr 2, 2014, at 3:52 PM, Larry Gerhardstein
David, that probably is it. My Y-device shows ohm meter continuity on
all 9 pins. For the required isolation, at least one pin should show open.
Larry W7IN
On 4/2/2014 21:26, David Christ wrote:
I suspect that the problem is that you have two transmitters on the RS232
circuit. Maybe you
Hi Larry,
One leg of the Y cable attaches to the SDA100. The other leg of the Y cable
attaches to the PC connection on the back of the P3. Then the separate RS232
cable supplied with the P3 goes between the XCVR connection on the P3 and
the RS232 connection on the K3.
73,
Mike K2MK
Larry
What -- they implemented this first on the KX3 and not the K3? I
remember discussing this in the FT days of the K3! Come on, guys...
On 4/2/2014 9:59 AM, Chris G7DDN wrote:
Apologies if this has been mentioned before...
One of the things I _/really/_ love about the KX3 is the stereo panning
Gernot,
See the KXBC3 manual page 4.
For the BAT ERR message it reads:
Battery missing or battery voltage out of range due to a fully charged
pack or a defective or
missing cell. With the KX3 on, tap any switch to clear the message. The
charging cycle is
terminated (does not restart
I solved the problem by removing pin 2 from one side of the null modem
between the K3 and SDA100. Now turning the K3 frequency tuning knob
results in correct frequency display on both P3 and SteppIR controller.
The pin was easily removed with a pair of needle nose pliers. I can now
get on
Also, when a P3 is communicating with the K3, the RS-232 Y connection cable to
the Steppir and computer should be used at the P3 computer connector, not at the
K3. That will hide the internal P3-K3 data comms form the steppir controller.
Eric
elecraft.com
On 4/2/2014 2:50 PM, Larry
This came up recently w/ the K3 as well, and perhaps a year or two
back. It /sounds/ like a tiny relay is clicking in the K3 on t/r
switching even though it's all solid-state. Wayne speculated that the
sound might be coming from relay springs re-balancing slightly in response
to
Can I substitute a LM358AN for LM358 in the K60XV for k2? There both dual op
amps
John WT5Y
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I enthusiastically second this motion. Before I got my K3 a few years
ago, I rigged up a pair of old Autek QF-1A filter boxes with some Rube
Goldberg relay switching to do this using my FT-1000D. Since the FT1K
uses USB CW, I set the right ear filter up as a low pass and the left
one as a high
As noted in the current KPA500 manual, this is normal and can happen after the
heatsink has been heated up. As it cools the different metals in KPA500 case and
heatsink contract at a different rate, causing the slight ticking that is
occasionally heard.
73,
Eric
elecraft.com
On 4/2/2014
I'm referring to KIO2 Pgrms Ref Rev E.
On Page 10, Table 5 SW command values for menu entry selection, I believe
command values for inp (keyer input) and rpt (message repeat) are
reversed in the table.
I've written a script to allow changing the keyer input by a single click of
a macro.
The K3 had it first - try setting AFX MD to BIN.
73,
Don W3FPR
On 4/2/2014 7:53 PM, Randy Farmer wrote:
I enthusiastically second this motion.
On 4/2/2014 11:59 AM, Chris G7DDN wrote:
Apologies if this has been mentioned before...
One of the things I _/really/_ love about the KX3 is the
BIN mode on the K3 does simple 180-degree phase reversal, like the
phase-reversal switch on some headphones. This can reduce operating fatigue if
you've been on the air for a long time.
PITCH mode on the KX3 actually maps pitch linearly from low pitch (left audio
channel) to high pitch (right
I'll try to summarize:
lo phase noise is good:
it reduces unintended radiation from transmitters.
it reduces reciprocal mixing on receiving.
surveys during contests are very revealing.
The KX3 and K3 have similar very low amounts of phase noise.
Unless I want to make a career of it I should
Sometimes I want to monitor RTTY while I am operating JT65/9 on my K3
(sn7901) which has the sub-rx. The only way I have figured out to do
this is to set both vfo A and B with [AB] to data sub-mode AFSK A (LSB)
for RTTY, and then switch vfo A to DATA A (USB) for JT. If at anytime I
try to
Dave,
By any chance do you have the VFOs set to LINK?
73,
Don W3FPR
On 4/2/2014 9:16 PM, Dave Barr wrote:
Sometimes I want to monitor RTTY while I am operating JT65/9 on my K3
(sn7901) which has the sub-rx. The only way I have figured out to do
this is to set both vfo A and B with [AB] to
I have successfully un-bricked my K3.
No attempt to load 4.83 would work. Even after updating to the current version
of the utility and trying a different USB/Serial device.
However, I was able to successfully load the 4.67 firmware. After I did that, I
did a Send New Firmware to K3
The Timewave DSP-599zx also has a similar stereo panoramic feature.
Brian KB1VBF
Sent from my iPad
On Apr 2, 2014, at 8:04 PM, Don Wilhelm w3...@embarqmail.com wrote:
The K3 had it first - try setting AFX MD to BIN.
73,
Don W3FPR
On 4/2/2014 7:53 PM, Randy Farmer wrote:
I
Excellent! I'm very glad to hear that, Bill.
Phil W7OX
On 4/2/14, 7:34 PM, Bill Coleman wrote:
I have successfully un-bricked my K3.
No attempt to load 4.83 would work. Even after updating to the current version
of the utility and trying a different USB/Serial device.
However, I was able to
The Ten-tec Orion has a really good implementation of binaural CW. With
headphones on, you can literally “see” the position of a particular CW signal
from left to right. I always found it amazingly effective and useful. I no
longer own the Orions or Orion II, but I do miss that feature.
I’d
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