Re: [Elecraft] RX IQ USB Noise

[Enzo Adrian-Reyes]

This would be hard but I can see how that could happen.
The KX3 and the laptop use 2 prong connectors and this still happens, the
macbook pro has a grounded power plug
but this still happens.

The stupid thing is they all share the same power board, so in theory they
should all be sharing the same green wire.

However

The KX3 chassis is connected to a ground system independent than the
electrical ground, the same way I thought hams connected their radio
equipment to ground (through a ground rod). The problem I have is that I
live near KVA power lines, and they induce a current on the shield of the
coax, which if I dont ground the KX3 causes electrical build it which I can
sense with my finger.

So given what you have said the ground of the KX3 chassis is connected to
the ground system for the radio, and this is causing the loop.
However this means I cannot do what you suggest, as the ground in all the
plugged elements is already connected to the green wire, except the KX3
whose power supply is a double isolated, except the chassis which is
connected to the radio ground.

I do not know how to solve this, my only work around for this would be to
try to isolate the incoming current with arrestors at the entrance of the
shack, but that might not get rid of this current.

Regards


On Thu, Sep 1, 2016 at 3:06 AM, Jim Brown  wrote:

> Loop is absolutely the wrong way to view this problem, and transformers
> are NOT the easiest or cheapest solution.
>
> The solution is 1) proper chassis-to-chassis BONDING between all of the
> equipment being interconnected and 2) get power for all of the
> interconnected equipment from the same mains outlet, or from outlets that
> share the same "green wire" (what is called the "protective earth" in
> Europe).
>
> 73, Jim K9YC
>
> . On Wed,8/31/2016 1:58 AM, Andrew Hebden wrote:
>
>> This sounds like a 'hum loop' problem, the scourge of audio enthusiasts.
>> In effect there are two earth connections between the KX3 and PC and it
>> forms a small loop aerial where by it picks up mains interference. You
>> could
>> try running the cables from the KX3 to the PC very close together.
>> It doesn't affect most people but I did get this problem a bit ago, but
>> not
>> with my KX3. The solution for me was to fit two small audio isolation
>> transformers (one for each channel) in the IQ line, fitted in a small
>> project box, and the problem went away. This has long been the recommended
>> procedure for most audio lines between a PC and a rig.
>>
>
>
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[Elecraft] RX IQ USB Noise

[Enzo Adrian-Reyes]

HI all

Me again, I have a problem with my setup and trying to work out what is
wrong. I have a  handy video, which shows my problem:
https://www.youtube.com/watch?v=hZPYUVpqefI

I hope somebody knows how to fix this, I've tried different USB hubs,
different laptops even.
I havent tried a different sound card though but then again I don't want to
keep throwing money at a problem unless there is a less expensive way to
fix this.

Regards

VK3FRAD
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Re: [Elecraft] KX3 SDR

[Enzo Adrian-Reyes]

Hi

Yes, well I have used those in the past, hence my confusion, when I see
bandwith of a SDR at lets say 24Khz
and I am sampling at 48Khz. Does that mean I am sampling the whole bandwith
of 24Khz centered on freq X, or
am I a sampling some point Y at +/- from the center frequency.

I am trying to design a digital mode, and while I do understand the
concepts, could do it in GNU radio but it abstracts a lot of this away, and
I would like to do this in C/C++
So before getting there I have to know what is going on, especially what
data is coming from the device.

Thinking about it yeah it would have to be a stream of IQ signals coming
from the KX3 with a certain freq set, but I am guessing its in the time
domain. Not at the freq domain?



On Thu, Jul 28, 2016 at 10:26 AM, Don Wilhelm <donw...@embarqmail.com>
wrote:

> If you are writing your own software, you will have to become proficient
> in Digital Signal Processing.  The I and Q signals are simply baseband
> signals that are 90 degrees out of phase - by themselves, they will do
> nothing but audio signals, but with DSP processing, they can do most
> anything that is possible in the math of digital signals - limited only by
> your processing power and skills at DSP signal processing.
>
> Run them through FFT transforms to convert them to digital signals, and
> then do the math of your DSP algorithms to produce whatever you want -
> panadapter display, demodulation, etc.  You can add filtering and other
> things like AGC, Noise Reduction, Noise Blanking, and a whole variety of
> effects.  It is all in how you choose to implement you DSP mathematical
> functions.
>
> Rather than write your own, there are several DSP applications available
> for free or at nominal cost - try HDSDR or NaP3 or WIN4K3 as examples.
> Once you see what is happening with those applications, you may be moved
> to write your own DSP application to process the I and Q signals.
>
> 73,
> Don W3FPR
>
>
> On 7/27/2016 7:16 PM, Enzo Adrian-Reyes wrote:
>
>> Hi All
>>
>> Yes this topic might be a little bit more complicated than the title
>> suggest.
>>
>> So I have the KX3 plugged into the audio input of my computer, and its
>> sending quadrature data (IQ) to the sound card, the sound card samples at
>> 96Khz.
>>
>> So my question is how I process this? Yes I know use a piece of software,
>> but I am trying to write this, I know the IQ data is coming through down
>> and if I use the right process on the IQ data I get base band data out. I
>> kind of know that however I dont understand the SDR data coming out, so
>> for
>> example and I getting sample of IQ data at freq point Y, or is it  a
>> circular buffer arrangement.
>>
>> I guess what I am saying is, is the IQ data coming from teh KX3 data from
>> teh Centre Freq (+/-) the bandwith scope, or just the centre freq + some
>> additional side bands?
>>
>> How are bandwith and sampling rate related? I mean if I am sampling at at
>> 96Khz, with a band with of 48Khz does that mean I am only getting 2
>> samples
>> per second at perticular freq??? Or am I getting the entire band of 48Khz
>> at 96Khz.
>>
>>
>>
>
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Re: [Elecraft] KX3 SDR

[Enzo Adrian-Reyes]

Hi Tom

I never thought it was simple :)

I am just trying to understand what is going on, so given by what you've
said I would push the IQ data coming from the KX3 into an FFT, that FFT
would then produce the circular buffer  that would  let me analyse what
signals are in that band?

But this would be in the frequency domain then, however I am not interested
in a band plot,  I have a signal at Freq X, with the KX3 tuned at Y, (X=Y),
would I have to still pump that IQ data into the FFT to filter all the
other signals out, then inverse teh FFT to get the IQ data that I would
want?

Regards


On Thu, Jul 28, 2016 at 9:41 AM, tomb18 <tom...@videotron.ca> wrote:

> Hi It's not that simple
> Basically you take the I and q signals, sample them with the sound card,
> convert them to a complex number, pop them  in a fast Fourier transform, do
> a rectangular to polar conversion and then calculate the magnitude in dBm.
> Then plot them. There's a few more nuances but that's the overall idea.
> Check out the free book on the Internet called the scientists guide to
> digital signal processing.
> 73 Tom
> va2fsq.com
>
>
>
> Sent from my Samsung Galaxy smartphone.
>
> ---- Original message 
> From: Enzo Adrian-Reyes <enzo.adrianre...@gmail.com>
> Date: 2016-07-27 7:16 PM (GMT-05:00)
> To: Elecraft List <elecraft@mailman.qth.net>
> Subject: [Elecraft] KX3 SDR
>
> Hi All
>
> Yes this topic might be a little bit more complicated than the title
> suggest.
>
> So I have the KX3 plugged into the audio input of my computer, and its
> sending quadrature data (IQ) to the sound card, the sound card samples at
> 96Khz.
>
> So my question is how I process this? Yes I know use a piece of software,
> but I am trying to write this, I know the IQ data is coming through down
> and if I use the right process on the IQ data I get base band data out. I
> kind of know that however I dont understand the SDR data coming out, so for
> example and I getting sample of IQ data at freq point Y, or is it  a
> circular buffer arrangement.
>
> I guess what I am saying is, is the IQ data coming from teh KX3 data from
> teh Centre Freq (+/-) the bandwith scope, or just the centre freq + some
> additional side bands?
>
> How are bandwith and sampling rate related? I mean if I am sampling at at
> 96Khz, with a band with of 48Khz does that mean I am only getting 2 samples
> per second at perticular freq??? Or am I getting the entire band of 48Khz
> at 96Khz.
>
> Regards
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[Elecraft] KX3 SDR

[Enzo Adrian-Reyes]

Hi All

Yes this topic might be a little bit more complicated than the title
suggest.

So I have the KX3 plugged into the audio input of my computer, and its
sending quadrature data (IQ) to the sound card, the sound card samples at
96Khz.

So my question is how I process this? Yes I know use a piece of software,
but I am trying to write this, I know the IQ data is coming through down
and if I use the right process on the IQ data I get base band data out. I
kind of know that however I dont understand the SDR data coming out, so for
example and I getting sample of IQ data at freq point Y, or is it  a
circular buffer arrangement.

I guess what I am saying is, is the IQ data coming from teh KX3 data from
teh Centre Freq (+/-) the bandwith scope, or just the centre freq + some
additional side bands?

How are bandwith and sampling rate related? I mean if I am sampling at at
96Khz, with a band with of 48Khz does that mean I am only getting 2 samples
per second at perticular freq??? Or am I getting the entire band of 48Khz
at 96Khz.

Regards
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Re: [Elecraft] Can a KX3 be configured to work like a K0 or K0 mini?

[Enzo Adrian-Reyes]

Uhmm

That is a feature I was looking into before evaluating a decision to get a
K3 or not.
However this seems inadequate, I was hoping for a REMOTE feature aka: I am
in a seperate room controlling the K3 with the KX3
Even if that required two computers, which I can wire up via the LAN.

Regards


On Mon, Jul 25, 2016 at 10:55 AM, iain macdonnell - N6ML 
wrote:

> On Sun, Jul 24, 2016 at 1:39 PM, george allen 
> wrote:
> > Wondering if I can use my KX3 for remote operation?
>
> AFAIK this is still valid...
>
> https://www.mail-archive.com/elecraft@mailman.qth.net/msg145357.html
>
> 73,
>
> ~iain / N6ML
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Re: [Elecraft] Noise Cancelling K3S

[Enzo Adrian-Reyes]

Nobody here have noise problems?
I've spoke to a few VK Hams here they all say they have 9db of noise on 40M

I get power line noise as I am near Kilo Volt power lines and it causes a
lot of noise.

I know the K3S has the diversity transceiver and if its a DSP feature it
could be added to the K3S.

Regards

On Wed, Jul 13, 2016 at 11:52 AM, Dave Cole <d...@nk7z.net> wrote:

> On Wed, 2016-07-13 at 09:53 +1000, Enzo Adrian-Reyes wrote:
> > Hi All
> >
> > I am just wondering since the rise of amount of noise sources, why
> > couldn't elecraft come up with an integrated solution for this, either
> > on the K3 like or perhaps add a unit external to the KX3.
> >
>
> I have often wondered the same thing...
>
> --
>
> 73's, and thanks,
> Dave (NK7Z)
> For software/hardware reviews see:
> http://www.nk7z.net
>
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Re: [Elecraft] Help sell me on the K3S

[Enzo Adrian-Reyes]

Was thinking of a K3S, although I have a KX3, I am quite surprised as to
how well it performs, the radio is simply amazing, and I am only allowed
10W since I am on the foundation license.

Thinking rather than the 100W amp spend the money on a K3S/10 and slowly
upgrade.

Regards

On Mon, Jul 18, 2016 at 2:20 PM, Phil Wheeler  wrote:

> I believe you have the KAF2, the audio filter. Likely it will do well
> enough for you -- and it cannot be used with the KDPS2, it's one or the
> other.
>
> It discontinued, may be due to some part obsolescence.
>
> 73, Phil W7OX
>
> On 7/17/16 7:26 PM, Reuben Popp wrote:
>
>> Interesting, but the KDSP2 appears to have disappeared on the order page.
>> Did that part become discontinued for one reason or another?
>>
>
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Re: [Elecraft] {OT} Alexloop Walkham Antenna

[Enzo Adrian-Reyes]

People seem to have good opinions on the AlexLoop, but I had one feedback
into my KX3 and forced it shutdown, I've heard of other similar things as
well with magnetic loops. The thing to remember is that you need that ATU
off before it can work.

On 40M I couldnt even get a signal out, and other frequencies here in VK
are dead except 2m/73cm

73

On Wed, Jul 13, 2016 at 11:01 AM, Chip Stratton 
wrote:

> On some SOTA activations I will start off running my KX3 at 1 watt with my
> AlexLoop to try to reduce the initial pile-up to a more manageable level.
> Sometimes it works, and sometime it doesn't seem to matter, there is still
> a pile-up!
>
> The most important thing when using the AlexLoop is to be able to see the
> SWR change continuously as you tune it. If your transmitter has a good SWR
> indication you should be fine.
>
> I suspect you would be pleased with its performance even at 1-2 watts.
>
> 72
> Chip
> AE5KA
>
> On Tue, Jul 12, 2016 at 4:23 PM, stan levandowski 
> wrote:
>
> > I would like to correspond with anyone who has experience using the
> > Alexloop antenna with 1-2 watts.
> >
> > Normally, I use either an end fed antenna and a T1, a resonant linked
> > dipole, or a resonant Par HF Omni-Angle (for 20 and 17 meters).  They all
> > work quite well for their intended use but require some effort to erect.
> >
> >
> > I have been reading about the Alexloop Walkham for at least the last two
> > years.  It would present some distinct advantages to me and the reviews
> > seem to be overwhelmingly positive.
> >
> >
> > My concern is that while I have a KX2 for my home station, I only take my
> > LNR five band Mountain Topper out on my portable jaunts.  On a 9 volt
> > transistor battery, I get a bit over 1 watt; on 12 volts I get 2.5 watts.
> >
> >
> > My specific interest is in finding out as much as I can about how this
> > small Alexloop performs at such low power levels since its efficiency is
> > reported to be about 7% on 40 meters, rising to about 25% on 20 meters.
> >
> >
> > An email to Alex has gone unanswered for the last two days.
> >
> >
> > Thanks and 73 from Stan WB2LQF
> >
> >
> >
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[Elecraft] Noise Cancelling K3S

[Enzo Adrian-Reyes]

Hi All

I am just wondering since the rise of amount of noise sources, why couldn't
elecraft come up with an integrated solution for this, either on the K3
like or perhaps add a unit external to the KX3.

Something similar to this
http://www.mfjenterprises.com/Product.php?productid=mfj-1026
I know the K3 has a subreciever perhaps some DSP wizardry could be used to
create this.

On the KX3 that would be impossible so an external unit perhaps would be
required similar to the PX3.

I guess my problem is that I get a lot of noise and I know there is this
solution from MFJ, and other like integrated noise cancellation near the
speaker end by BHI, but why couldn't elecraft come up with something
similar to this functionality on the K line that is beautifully integrated,
so messy PTT relays aren't required.

No I dont have a K3 I have a KX3, but this would be a big win I believe for
people in a surburban block like me.

Regards
VK3FRAD
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[Elecraft] Base Station

[Enzo Adrian-Reyes]

I know this list is a bit biased, however I am trying to set up my base
station, I currently own a KX3 and an ICOM 7100, and I have an antenna that
is an inverted V diapole, (Diamon W8010), which is hosted 6m up in the air.

My problem is I live nearby a lot of interference due to high voltage power
lines, now, my dilemma is
I want to get rid of my ICOM 7100, and I have to replace it with a base
station, so is the KX3 with the addons good enough for base station op, or
shuold I sell that and get a K3S perhaps a KX2 for mobile ops? I would like
to do SOTA really, and have a portable handy, I am only allowed to transmit
for the moment 10W any way, so k3s/10 should be enough to start with,
however I have a bucketload of noise, my KX3 is under going repairs and I
wont know when it will be back,hopefully its not too expensive as I will
def blow my budget over many times.

So any body here have any experience on running their KX3 as their main
base station? if so how well does it do? Would a k3s be better? what
advantage would I have with the K3S (baseline) compared to an upgraded KX3
(ATU, 2m, Roof filters fitted)

I am worried about sensitivity, and ability to pick weak signals, as I have
very little room to fit larger an better antennas so I have to kind of work
with what I have.

Regards
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[Elecraft] KX3 ATU Problems

[Enzo Adrian-Reyes]

Hi there

At the moment I've had so many issues with my KX3 I am kind of wondering
what is wrong with it.
The problem is I dont use it much but so far its died on me three times,
any how the new issue so far is, the ATU, it wont tune down my end fed
antenna below 24.5-1 SWR,

No matter the band the lenght of the end fed, with a balun with no balun it
doesnt work at 50Mhz it tunes down 8.9-1swr.

This has been happening since last year, the first time i was on a
buddipole while on a DX-pedition, and generally thought it was a one off
thing, but now this second time its done it again, I just cannot get the
unit to tune it down.

The antenna is a EARCHI 40-6m end fed antenna, I've sold the buddipole
because I couldnt go for a while, but this is now persistant.

Any ideas on what is going on?

Regards
VK3FRAD
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[Elecraft] KX3 Errors and Strange behavior

[Enzo Adrian-Reyes]

Hi there



I am having a few issues with my kx3, firstly last night I while trying to
use it I got a ERR DS5 message, but during that time while in use, any time
I would transmit it would randomly change my bandwith settings, display the
wrong roofing filter information. It eventually just gave up and displayed
that DS5.

The other issue is that the power and SWR meter while transmitting dont
move or update after a few second or dont update at all while on SSB. This
has been happening for a while.

I've tried resetting it, but after EEINIT message it still displays my
banner and it feels like it hasnt reset everything, I've also restored the
settings, but the power and SWR meter still dont show.

I would like some help on this to fix this issue, what steps can I do to
check everything is ok with the transciever, before mailing it out.

As an additional note the antenna I was using was an Alexloop portable
magnetic loop.

Regards
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Re: [Elecraft] KX3 Errors and Strange behavior

[Enzo Adrian-Reyes]

I have contacted elecraft I did so , yesterday morning and I havent heard a
thing yet, so I am posting here to get more information.

On Wed, Jun 10, 2015 at 10:12 AM, Matt Maguire matt.vk...@gmail.com wrote:

 Before you do anything else, I suggest you contact Elecraft Support, and
 tell them what you have done up to this point so they can advise you as to
 the best way forward from here.

 73, Matt VK2RQ




 On Tue, Jun 9, 2015 at 4:18 PM -0700, Enzo Adrian-Reyes 
 enzo.adrianre...@gmail.com wrote:

  Hi there



 I am having a few issues with my kx3, firstly last night I while trying to
 use it I got a ERR DS5 message, but during that time while in use, any time
 I would transmit it would randomly change my bandwith settings, display the
 wrong roofing filter information. It eventually just gave up and displayed
 that DS5.

 The other issue is that the power and SWR meter while transmitting dont
 move or update after a few second or dont update at all while on SSB. This
 has been happening for a while.

 I've tried resetting it, but after EEINIT message it still displays my
 banner and it feels like it hasnt reset everything, I've also restored the
 settings, but the power and SWR meter still dont show.

 I would like some help on this to fix this issue, what steps can I do to
 check everything is ok with the transciever, before mailing it out.

 As an additional note the antenna I was using was an Alexloop portable
 magnetic loop.

 Regards
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Re: [Elecraft] KX3 Errors and Strange behavior

[Enzo Adrian-Reyes]

Problem is I am in Australia, I work full time, I don't have the right TZ
to call them, where I work I am not allowed to make unauthorised calls to
the outside since I am in a secure facility making this practically
impossible to do.

On Wed, Jun 10, 2015 at 11:10 AM, Joshua Gould jg.k8...@gmail.com wrote:

 I would call them tomorrow...  You'll get much faster service...

 72,
 Joshua Gould
 K8WXA
 EM89pn

 KX3 # 7480

 NAQCC # 7704
 OMISS # 9948
 4sqrp # 990
 FP # 3579

 On Tue, Jun 9, 2015 at 8:59 PM, Enzo Adrian-Reyes 
 enzo.adrianre...@gmail.com wrote:

 I have contacted elecraft I did so , yesterday morning and I havent heard
 a
 thing yet, so I am posting here to get more information.

 On Wed, Jun 10, 2015 at 10:12 AM, Matt Maguire matt.vk...@gmail.com
 wrote:

  Before you do anything else, I suggest you contact Elecraft Support, and
  tell them what you have done up to this point so they can advise you as
 to
  the best way forward from here.
 
  73, Matt VK2RQ
 
 
 
 
  On Tue, Jun 9, 2015 at 4:18 PM -0700, Enzo Adrian-Reyes 
  enzo.adrianre...@gmail.com wrote:
 
   Hi there
 
 
 
  I am having a few issues with my kx3, firstly last night I while
 trying to
  use it I got a ERR DS5 message, but during that time while in use, any
 time
  I would transmit it would randomly change my bandwith settings,
 display the
  wrong roofing filter information. It eventually just gave up and
 displayed
  that DS5.
 
  The other issue is that the power and SWR meter while transmitting dont
  move or update after a few second or dont update at all while on SSB.
 This
  has been happening for a while.
 
  I've tried resetting it, but after EEINIT message it still displays my
  banner and it feels like it hasnt reset everything, I've also restored
 the
  settings, but the power and SWR meter still dont show.
 
  I would like some help on this to fix this issue, what steps can I do
 to
  check everything is ok with the transciever, before mailing it out.
 
  As an additional note the antenna I was using was an Alexloop portable
  magnetic loop.
 
  Regards
  __
  Elecraft mailing list
  Home: http://mailman.qth.net/mailman/listinfo/elecraft
  Help: http://mailman.qth.net/mmfaq.htm
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  This list hosted by: http://www.qsl.net
  Please help support this email list: http://www.qsl.net/donate.html
  Message delivered to matt.vk...@gmail.com
 
 
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