Do you have a reference for an algorithm that will do this?
Noise reduction is difficult because any effective noise reduction has
to recognize what is signal, and ideally what is the part of the signal
that matters to the human. The hearing aid industry has been trying to
do this for years,
David's analysis is correct. Go to his last sentence - that is the
Noise Blanker (NB) and not Noise Reduction (NR). NB punches a hole in
the signal in response to impulse noise. It will cause signal
distortion, getting worse with more aggressive settings.
Noise Reduction (NR) depends on
Use external audio processing, otherwise a compressor or limiter, with
variable attack and release and threshold and ratio controls. Then
follow that with a small power amp to drive an external speaker.
Frankly, I doubt you'd like the results.
I find it better to not use the NR feature
Al-W6LX,
Commendable. I enjoy building stuff, too. Not so far as to design a
radio "ground up" but my first ham radio was a kit back when I was 14
years old. Mainly because it was cheaper ($19.95 in 1958). When I
got my Novice license my dad bought my elmer's DX35 for me (he wanted
to
Hello EA3IN,
There is a 1 kilowatt solid state amplifier, using NXP 188 final power
transistors, built in England.
Please see LinearAmp company, model Gemini HF-1K amplifier. I believe
that DXshop is the
vendor. Regards, bp. K2AYA.
On 1/12/19 12:59 PM, Marcel Jorba via Elecraft wrote:
Regarding my K3 (original): DSP reduces the volume. When you turn the
volume up to where you can again hear - the junk noise level is right
back up there also.
A couple of days ago we had a major wind storm and a power line down the
road was periodically arcing. It was uncomfortable to listen
Sorry, KX3. Though I think the K3 and KX2 use similar algorithms.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Jan 11, 2019, at 8:53 PM, John Evans wrote:
>
> And yet, I have no idea which Elecraft rig you are referring to here. Drives
> us K1, K2, KX3
If you can run 200 watts PEP with the TR7, why run a 500 watt amp?
Otherwise, you'll need a 10dB attenuator between the TR7 and the
KPA500. Hence turn 180 watts of RF from the TR7 into heat as it takes
only about 20 watts to drive the KPA500 to rated output.
73
Bob, K4TAX
On 1/12/2019
Marcel,
Can you add a "Power Control" to the TR7?
It may be as easy as applying a constant negative voltage to the ALC
input. That constant ALC voltage will not cause the problems
encountered when using the dynamic ALC voltage that is applied from the
amplifier.
73,
Don W3FPR
On 1/12/2019
iSDR does require a USB soundcard with a stereo mic input, like the Griffin.
The easiest way to check if you are utilizing the stereo mic function in iSDR
is to check your iPad screen while running it and see if you are getting 22 or
44 kHz. If it shows 22, you are only getting mono mic.
Jeff
Greetings from Barcelona
I have here a K3-KPA500 setup that runs great
I also have a TR7 and I am thinking about using it together with the KPA500 The
obvious problem: The TR7 delivers a lot of watts (200 pep).
Is it an idea to discard? Or is there any reasonable approach to? ALC control
is not
Thanks for the input I'm using the suggested iMic which does have a line
input and a mic input. I'm beginning to believe that it really is that the
radio is not working correctly. I'm going to reach out elecraft directly to
see what I can do without sending the radio to them for the fact that I'm
Please Unsubscribe me to the Elecraft mailing list.
Thank You very much.
Francesco Gentile
I2MKS, Milano,. Italy
email: f.genti...@gmail.com
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Help:
I love that one. Along the same lines, a broad brick-wall notch that
auto-detects the recurring clown show on 7200 KHz would be a welcome addition
... especially if it could auto-suppress music.
Sent from my iPhone
>
> My favorite so far is the request for Semantic Filtering Mode (SFM), which
forty years in the audio business have allowed me to hear some of the
best and worst audio/\
I bought clear speech before and after Bob tired selling it, and two
others before finding the BHI product series from England. Some how
their algorithm, to me at least, does the least harm to human
I know Wayne requested direct replies to his query and I've already done
that, but I have a serious suggestion and I'm curious if others here
would be interested. Here it is:
===
The two receivers in a K3 or K3s can be phase locked for diversity
reception, and the new synths preserve that
Dave,
Using Diversity Receive, the human brain does that automatically (but
not with the numbers). You can sort out both signals and automatically
pick the best one or a blend of the two. This is an unconscious process.
The name of the game is communications, not looking at numbers
As such things seem to go in my life, I received my new KPA-1500 the day
before the NAQP, which has a 100-watt limit. Imagine my delight to
discover that the ATU can operate with the amp on standby. Using this
feature, I was able to feed my 40m 1/2 wave sloper on 80 meters, in
place of my
Hello Elecraft mailing list,
Thank you for your mailing list and the good information
I received. However, please un-subscribe me from the
mailing list. Regards, bp. K2AYA
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bp,
We on the list are just users like you, and we cannot unsubscribe anyone.
You will have to unsubscribe yourself. Go to the "Home:" link at the
bottom of any posting and sign in to unsubscribe or change your settings.
If you have trouble, email modera...@elecraft.com and ask for
On Fri, Jan 11, 2019 at 8:50 PM Walter Underwood
wrote:
> It would be really great if the AF gain was automatically to keep the
> audio roughly level when NR is engaged. This drives me nuts, always riding
> the gain back and forth. I’m sure the gain adjustment would be different
> for different
Grant,
Just turn the VFO knob! It works.
73,
Don W3FPR
On 1/12/2019 4:03 PM, Grant Youngman wrote:
I love that one. Along the same lines, a broad brick-wall notch that
auto-detects the recurring clown show on 7200 KHz would be a welcome addition
... especially if it could auto-suppress
Don,
No, it isn't the same at all and I don't understand why you think it
is. Your brain may be able to discern differences in phase and try to
focus in on one signal versus others, but it isn't going to do any of
these things:
1. Actually amplify a desired signal (probably 2 to 3 db) at
KXV3a, recently replaced by KXV3b - $85/shipped. Bob Brown, N1CVX
Sent from my iPad
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Post:
Bill,
When they are driven from the same synthesizer, they are indeed "phase
locked".
73,
Don W3FPR
On 1/12/2019 5:59 PM, Nr4c wrote:
I’m not an engineer but from the discussions here in the past, in diversity
mode, the VFOs are not “phase locked” but actually driven by the same
On the subject of BHI, I once had an ambitious project to build a switch box
incorporating some SO2R functions plus two BHI DSP single channel units. Before
I had finished wiring the unit (starting with just one BHI channel unit) my
understanding of SO2R requirements grew to the point that I
Hello everyone in Elecraft land!
I just wanted to share my initial results with the AX1 with my KX3 and I am
happy to report contacts on 20 meters at 2 watts on the AX1 from indoors,
the antenna just sitting on the table here in the shack! The contacts were
on wspr mode and I was getting out, but
The noise level at my QTH is not nearly as bad as many of you have. The K3
S-meter tends to read around S4 on the background noise noise (SSB bandwidth,
20m preamp off, atten off). When it comes to engaging NR, like many others I
have in the past tended to crank up the aggressiveness etc and
Just saw a message pop up saying Battery Low
Assume this is the internal battery requires replacement?
Regards,
Mark, K1RX
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Help:
Good Evening,
The small sunspot of last week has crossed over the limb of the
sun. Some auroral activity so there are ions out there. Without the
storms of summer it should be pretty quiet. My noise floor is normally
low, somewhere below S1. No nearby neighbors, no electric fences, and
Thanks for all the many great suggestions and digressions, folks. Sorry I can't
respond to all of them right away.
My favorite so far is the request for Semantic Filtering Mode (SFM), which
"might, with skillful adjustment, suppress political commentary from 75
meters." Our DSP IC does include
I’m not an engineer but from the discussions here in the past, in diversity
mode, the VFOs are not “phase locked” but actually driven by the same
synthesizer, so they both get the very same frequency info. Thus output the
same frequency.
Sent from my iPhone
...nr4c. bill
> On Jan 12, 2019,
Might I suggest a filter that translates a bug user who sends at 15wpm, but
the dots are set to 35wpm. The filter would briefly store the cw, correct
the timing, and then pass it through the audio stages. Call it the
VibroDummy, or VD1 filter setting.
Another one would filter out the long
Don
It is a K3. Bought it used and carries a low serial number. Never have changed
the internal battery (over 8 years in my possession).
Regards,
Mark, K1RX
> On Jan 12, 2019, at 11:41 PM, Don Wilhelm wrote:
>
> I assume you mean the KX3. The K3 has no internal battery.
>
> If you have
Sounds like a project for a neural network. A bit of AI which
'recognizes' patterns. There would be ~ 40 outputs for letters,
numbers, and symbols. I am unsure of the number of inputs nor of the
middle layer(s) of the net. But that's just a bit of engineering.
The training sets would
I assume you mean the KX3. The K3 has no internal battery.
If you have Ni-MH batteries, they need recharging. If you are using
Alkaline batteries, they need to be replaced. I assume you have set the
menu BAT MIN for the type of battery you are using. See the KX3 manual
page 36 of the
I get that message when the main power supply for the radio is
low. (I use a solar power with battery system most of the time.)
Check your power supply.
73 Bill AE6JV
On 1/13/19 at 9:01 PM, elecraft@mailman.qth.net (Mpridesti via
Elecraft) wrote:
It is a K3. Bought it used and carries a
Actually it does. I think it keeps the clock running …
Grant NQ5T
K3 #2091 KX3 #8342
>
>
> I assume you mean the KX3. The K3 has no internal battery.
>
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Eric
Best post of the year!!! I will be chuckling at that all night; yet, you
delivered exactly what Wayne asked for and we all wish our radios had. You
even gave the K4 speculators something to chew on for a while. I will go to
the gym tomorrow to start building my arms and legs to handle
I dug up some more info on replacement cushions. I had first bought a pair of
the replacement cushions from AliExpress.
They did not include the flat foam earpad covers. Only included were the ear
pad cushions.
I then bought a pair on eBay, item # 112534201835 that included the flat foam
40 matches
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