I can not see any reference to noise figure in the brochure. Just MDS and FM
sensitivity with no bandwidth.
When I get mine I will measure the noise figure on a test set. It is likely
to be under 2dB and I will use a low ENR head!
I suspect like the XV144, the K144XV will need some gain
IMHO an external sequencer is still the best way to have a foolproof
system. Running QRO with a mast mounted lna isn't a good idea if you
don't have one. 20 ms is not enough for sure, as most of the QRO coax
relays have a switching time of that amount or even more
My sequence timing is
In a recent message, AD6XY m.j.wil...@rl.ac.uk wrote ...
I can not see any reference to noise figure in the brochure. Just MDS and FM
sensitivity with no bandwidth.
The manual gives this as 1dB nominal.
See
http://www.elecraft.com/manual/K144XV%20Manual%20A3.pdf
73
--
David G4DMP/G3KEP
Leeds,
It's worth asking around as there are a lot of unbuilt SoftRock kits around.
I think people were either frightened off by the SMT parts or they just
never got around to it. Building it is harder than doing a K3 mod.
I do wonder how many people have actually tried the SoftRock on a K3 without
a
It looks like TX Delay is variable from 8 to 20mS. Perhaps this range
could be increased in the software ?
John G4ZTR
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Giulio Pico - IW3HVB
Sent: 08 January 2010 09:23
To:
David,
Wayne said: It's actually more like -144 dBm (500-Hz bandwidth). I assume
that this refers to a K144XV installed in a K3.
This equates to a noise figure of 3db.
To achieve a lower noise figure, the gain used in the K144XV would have to
be greater, which would further reduce the
I found an article here
http://www.kingsqueak.org/stuff/softrock_IF_tap.pdf
that shows a buffer amp that can be built from parts most people probably
already have...
His buffer consists of a pair of cascaded FET source-followers. It would be
a good idea to measure reverse isolation of the
The K3 has a TX INHibit input on the ACC connector that will inhibit RF
for any length of time you desire. Drive it with an output from your
sequencer that indicates sequence completed. See the manual for details.
73,
Don W3FPR
John Lemay wrote:
It looks like TX Delay is variable from 8 to
List,
According to the Icom SM-8 Desktop Microphone manual, there is only 1
wire for the Up and Down buttons.
So i suspect Icom feeds a positive voltage for up and a negative voltage
for down (or vice versa).
How to adapt this to make it work with K3?
I had good audio reports so far.
Martin
--
Gary,
The K3 remembers the filter settings per band and per mode. Increase
the DSP width and the filter selection will follow. You may have to
have an assistant to know that the right DSP filter control is set to
WIDTH instead of HI CUT - tapping the button toggles between those two
Martin,
According to the SM-8 microphone schematic, the UP button connects the
UP/DN line directly to ground, but the DN button connects the UP/DN
button to ground through a 470 ohm resistor. You would have to convert
these closures to 2 lines each of which is a circuit direct to ground,
so
Radio Amateur N5GE wrote:
On Thu, 7 Jan 2010 11:34:50 -0800 (PST), Wes Stewart n...@yahoo.com
wrote:
One of the tricks pulled on new
guys was a customer or another salesman asking for a set of spark plugs
for a Cummins, a radiator cap for a Corvair or an oil pan gasket for a
Powerglide
I worked in a TV factory, 1968. We sent the new guys to the supply window
for a raster stretcher.
Steve
N4LQ
n...@carolina.rr.com
- Original Message -
From: gdaug...@stanford.edu
To: elecraft@mailman.qth.net
Sent: Friday, January 08, 2010 1:06 AM
Subject: Re: [Elecraft] Noise Blankers
Don, W3FPR, was fastest as usual :-)
Problem solved, thanks.
--
73, DM4iM
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A final note: The author of that circuit created a pseudo low-Z output
through the use of a 20 dB resistive pad. The 1K output Z of the final FET
is feeding the low Z pad. Other than creating a lower final source Z at the
expense of further circuit loss, I cannot imagine why he was satisfied
On Fri, 08 Jan 2010 08:23:01 -0500, Mike n...@nf4l.com wrote:
[snip]
Y'all didn't use flight line to tie that bucket under the nacelle?
73, Mike NF4L
Yes, but we did that before the prop wash trick. When we sent them
for prop wash we sent them to the flight line, the location of which
I just measured the MDS of a production K144XV: -145 dBm. This is
with the module installed in a K3. It'll probably vary slightly from
one unit to the next.
73,
Wayne
http://www.elecraft.com
On Jan 8, 2010, at 2:44 AM, Geoffrey Mackenzie-Kennedy gm4...@btinternet.com
wrote:
5-pole 500 Hz K3 roofing filter (-0.74 offset) in perfect condition, $70
shipped via USPS First Class to any US ZIP code. Prefer check or money
order but can also take PayPal. New cost from Elecraft - $100 plus
shipping. Please reply off-list.
73, Bill W4ZV
I installed the K144XV module last night. The installation went smoothly with
no problems. I also had to install the KXV3A, so it took a bit longer than
installing the K144XV alone. I have one of the early K3's (serial #49), so I
had to replace the left side panel and the fan panel and had to
I know this - so does everyone. I have actually read the manual. However,
there is only one TX inhibit and it is shared with the K3 on signal, which I
happen to be using. Even if I was not using it the inhibit might easily be
set to the default K3 ON and be ignored. Perhaps one of the DIGOUT
Thank you for the info, David.
73,
Bill
K9YEQ
K2 KX1 (FIeld tester); K3; W2; mini mods
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Fleming
Sent: Friday, January 08, 2010 11:09 AM
To: Elecraft reflector
Subject:
A few questions about the K144XV...
1. I noticed from the manual that the chassis stiffener that comes with the
K144XV seems to be the same one that I already have in my late model K3 (3799).
Is this true?
2. Although I can look it is easier to ask: would it also be true that the
need to
Early days of TV Broadcasting we sent new projectionists to the competition
to get a box of sprocket holes - they always came back with them!
But when we sent them for a camera cable stretcher (does exist) they
wouldn't go.
George
AI4VZ
Hi all,
All of which don't exist.
And in the
Hi Phil,
A few questions about the K144XV...
1. I noticed from the manual that the chassis stiffener that comes
with the K144XV seems to be the same one that I already have in my
late model K3 (3799). Is this true?
The modified chassis stiffener has been phased into production. In
A totally different question:
Is support for coarse tuning in European VHF frequency rasters (6,25
12,5kHz) somewhere high on The List?
73'
Paul
PD0PSB
wayne burdick wrote:
Hi Phil,
A few questions about the K144XV...
1. I noticed from the manual that the chassis stiffener that
Bob - What does this correlate to in NF?
e
Wayne Burdick wrote:
I just measured the MDS of a production K144XV: -145 dBm. This is
with the module installed in a K3. It'll probably vary slightly from
one unit to the next.
73,
Wayne
http://www.elecraft.com
On Jan 8, 2010, at
Yes.
Wayne
N6KR
On Jan 8, 2010, at 10:22 AM, pd0psb wrote:
A totally different question:
Is support for coarse tuning in European VHF frequency rasters (6,25
12,5kHz) somewhere high on The List?
73'
Paul
PD0PSB
wayne burdick wrote:
Hi Phil,
A few questions about the K144XV...
Fortunately my spam filter is smart enough to kill this
kind of garbage.
Doug, W6JD
- Original Message -
From: juergen plebia...@yahoo.com
To: elecraft@mailman.qth.net
Sent: Thursday, January 7, 2010 3:45:55 PM GMT -08:00 US/Canada Pacific
Subject: Re: [Elecraft] My
fb!
mni tnx
73'
Paul
PD0PSB
Yes.
Wayne
N6KR
On Jan 8, 2010, at 10:22 AM, pd0psb wrote:
A totally different question:
Is support for coarse tuning in European VHF frequency rasters (6,25
12,5kHz) somewhere high on The List?
--
View this message in context:
Hello friends,
I tried to look for below mentioned function (jumper settings) in
144MHz module but in last rev of manual I missed or it is not there.
(yet?)
Are there any details about this possibility - to put +TX to centre
pin of BNC output?
Thanks for info,
73!
Lexa, ok1dst
K3/10 #727
in the aircraft mechanic trade we sent them out to get a bucket of prop wash
In the early days of TV,
we'd send them up to TV maintenance to get some dynode spots
(anybody remember them?).
VE7XF
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Home:
Either I have something set wrong in my K3 or in HRD and I do not know IF that
is true or which one is set wrong.
Waterfall with the actual frequency being displayed on the ruler bar above the
waterfall:
Radio set to 7.035, data mode, PSK signal showing at 7.037, tune radio to
7.036, frequency
I got my new DSP-C board. Somewhere I saw a step by step on how how to
replace it. Can someone locate it for me?
Steve
N4LQ
n...@carolina.rr.com
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Help:
I have an Icom SM-8 microphone attached to my K3's front panel and a Heil
Pro Headset with HC 4 element plugged into the rear panel. Depending on
working conditions and my mood I sometimes prefer one or the other
microphone.
The procedure requires to change Bias and sensitivity in the
On Fri, Jan 8, 2010 at 9:14 PM, Steve Ellington n...@carolina.rr.com wrote:
I got my new DSP-C board. Somewhere I saw a step by step on how how to
replace it. Can someone locate it for me?
I think someone sent steps in an email recently, but you should be
able to follow the steps in the KDVR3
Many thanks for all suggestions privately and to this list.
I can confirm that;
Ports have been checked with K3 utility
Checked correct port in device manager on PC
Did not stop after upgrading software
I am using KUSB with latest drivers since arrival of K3 #191
K3 is set at 38400 baud
I'm
The K144XV module's specifications include an input noise figure of
about 1 dB. This figure should be used when comparing the K144XV to
external 2-meter transverters such as the Elecraft XV144 (which is
about the same). This is the traditional way transverters are specified.
When the K144XV
That would be almost at the bottom of any list of potential problems I
would suspect. The only gradual degradation mode I can think of for any
low power transistor, plastic encapsulated or otherwise, built in the
last 30 years by any reputable manufacturer occurs when the base-emitter
Here are some photos of the new Rev. D DSP board.
http://n4lq.webs.com/apps/photos/album?albumid=7872520
Steve
N4LQ
n...@carolina.rr.com
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Help:
What specifically were the details of the supposed issue with older
K3's? Does the RS-232 line in the K3 reverse bias the emitter junction
(exceed BVebo) of that transistor?
No.
The KIO3 uses a twin-tee oscillator to generate to required negative
voltage. This is to eliminate the
Roger,
I do not believe the transistors on the IO board should be very high on
the suspect list. It is rare to find a component failure unless it has
been subjected to some unusual stress - component degradation in 3 years
or less is highly unlikely, 20 to 40 years, maybe, but not 3.
May I
Hello, Werner!
I would recommend a pair of macros, one to select the front panel microphone
and another to select the rear panel microphone.
Each macro might need to toggle the high/low sensitivity settings and the
bias. These aren't going to be idempotent macros.
I don't have an SM-8, but I
I agree with Don.. I wouldn't waste the time checking that transistor. It would
be an exercise in futility. My bet is on the KUSB.
David, W4SMT
--- On Fri, 1/8/10, Don Wilhelm w3...@embarqmail.com wrote:
Roger,
I do not believe the transistors on the IO board should be
very high on
the
Jim,
Your description sounds very much like what would be expected to happen
if the software thought the radio was in upper sideband but the radio
was actually in lower sideband.
You didn't mention which of the K3's four data sub-modes you were using.
Two of them are USB and two are LSB. If
hi Dick,
thank you very much for your detailed description. It works like a charm,
the only thing I had to change was SWT12, which can be omitted, because
the K3 remembers the BIAS setting for the rear and front panel microphone.
It might be a wish for future firmware versions to make the
Had a few that got sent out to empty the grid leak pan, from under the console
tv set too.
--... ...-- Dale - WC7S in Wy
_
Hotmail: Trusted email with Microsoft’s powerful SPAM
Hi, Everybody,
What great comments I got from you in private e-mail messages. It's highly
interesting getting your perspectives on receivers and listening.
Due to day job and family I can't respond to every observation and
objection but in particular Doug KR2Q-- who has some of the best ears
I agree also. Try a different device on the cable, like a digital
camera, or an iPOD, or a GPS, or..
73, Mike NF4L
Don Wilhelm wrote:
Roger,
I do not believe the transistors on the IO board should be very high on
the suspect list. It is rare to find a component failure unless it has
Al,
From the tests I have done, I discovered that the K3 has a flat
passband and very sharp filter skirts - in fact, very close to the
ideal filter sought by many in past years. Other receivers tested
(K2, Yaesu FT-900, FT-817) showed that their passband was not flat, but
tapered smoothly
I might add - perception is 99% of reality. I write of theoretical
terms, but how the human ear/brain combination perceives things of this
nature is indeed a subject for reflection and discussion.
I expect that there will be many on both 'sides of the fence'.
73,
Don W3FPR
Al,
From the
I agree that the transistor is likely not an issue. However, Lyle did write:
About a year ago we changed the transistor used in this
oscillator to a higher-gain device because a small number of KIO3
modules had marginal negative voltage.
Unless I'm mistaken, it seems to me that holding the K3
I've also considered that theory. It would be interesting (and easy
with an external audio mixer) to add a little pink noise to the audio
output to see if that mellows the sound a bit.
73
--
Joe KB8AP
On Jan 8, 2010, at 6:05 PM, Don Wilhelm wrote:
So my supposition is that we are not
Wes,
No-one is holding the K3 blameless, but in the interest of complete
troubleshooting, it is quite reasonable (to me) to check the easy things
first if for no other reason than to eliminate them from the suspect
list. It is often that the things that are most frequently overlooked
are the
Why would you not want to look at the noise footprints with a spectrum
analyzer? Your ear may tell you that there is something there that you
don't like, but the spectrum analyzer will tell you what it is. If you
are making audio files, send me a copy and I'll take a look at them for
you
I also have an HC-4 plugged into the rear panel and another microphone,
currently a PR781, plugged into the front panel. I have working macros
to switch from FP to RP and back again.
I am looking for the macro commands to set the equalizer for the PR781
when I switch to the front panel jack and
The K3 is very much quieter out of the passband than other
receivers (the K2 is close) - the response is down at least
60 dB as opposed to the out of passband 'garbage' in other
receivers only about 30 dB down.
Here is the genesis of the complaint that the K3 is more
fatiguing than
You mean they don't send you instructions on replacing it?
John N1JM
Steve Ellington wrote:
I got my new DSP-C board. Somewhere I saw a step by step on how how to
replace it. Can someone locate it for me?
Steve
N4LQ
n...@carolina.rr.com
Thanks guys, yes, I had been messing with the data modes and left it in
AFSK, back to Data A and it is all well again. And thanks for the
explanation of which way the Data modes are. Nice to know.
73, Jim
- Original Message -
From: Richard Ferch ve3...@storm.ca
To:
So what you are saying is the K3 is too quiet for its own good, and that's what
makes it so noisy!
- Original Message
From: Joe Subich, W4TV li...@subich.com
To: d...@w3fpr.com; Al Lorona alor...@sbcglobal.net
Cc: Elecraft Reflector elecraft@mailman.qth.net
Sent: Fri, January 8, 2010
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