Date   

Re: New Noise Reduction Features in SP1A External Speaker

Klaus Brosche, DK3QN <dk3qn@...>
 

Hi Vianney,

Is there a field(user)-installable upgrade option planned for
converting an existing SP1 into SP1A?

73, Klaus, DK3QN


Am 05.11.2019 um 12:19 schrieb Vianney Colombat:


Hi Clint,

an LMS algorithm is used and the five positions are in 3dB steps. Also the volume adjustment has 5 positions and is in 3dB steps.

Vianney

Il 04/11/2019 13:07, Clint Chron ha scritto:

Hi Vianney,

 

Are any specs available for the amount of noise reduction available for each of the five filter positions?

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Vianney Colombat
Sent: Monday, November 4, 2019 1:26 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 

 

Hello all,

 

actually, the SP1 has been replaced by SP1A which has been redesigned to improve the quality of the filter that uses an Analog Device DSP for noise reduction. 

 

Vianney

 

From: "Clint Chron" <kiheiman@q.com>
To: <EladSDR@groups.io>
Date: Sun, 3 Nov 2019 13:20:51 -0700
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker
 

Hi Bill,

 

I suspect you have the older SP1 speaker.  The new SP1A file on the Elad Web site is dated October 2019.  The old SP1 speaker only had some passive audio filters (3 positions).   The new SP1A manual gives details on how to select the five different filters and how you can tell which filter is enabled via the three LEDs.

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Bill Kennedy via Groups.Io
Sent: Saturday, November 2, 2019 11:38 PM
To: EladSDR@groups.io
Subject: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 





From: Billknn <billknn@...>
Date: November 3, 2019 at 1:21:25 AM CDT
To: EladSDR@groups.io
Subject: Re:  New Noise Reduction Features in SP1A External Speaker

I have the SP1 and am not all that impressed, sad to say. If there are 5 levels of noise reduction, I’d be very surprised, especially since there is only a 3 position switch and position 1 is no filtering. Actually I get a terrible AC hum (ground loop?) using the speaker that I’m trying to track down. It’s the only thing in the shack that has that hum. With no antenna connected it is quiet. The Duo and the speaker are connected to the same power supply. I still have more testing to do. If I figure out how to get rid of the ac hum maybe my opinion would change.

It appears to be very solidly built and nicely matches the radio but I wouldn’t buy it again.

 




Le informazioni contenute in questo messaggio di posta elettronica sono riservate e confidenziali e ne è vietata la diffusione in qualunque modo eseguita (DL 196/2003). Qualora Lei non fosse la persona a cui il presente messaggio è destinato, La invitiamo ad eliminarlo e a non leggerlo, dandone gentilmente comunicazione al mittente.

The information contained in this e-mail and any attachments is confidential and may well also be legally privileged (DL 196/2003). If you are not among the named recipients, please notify the sender immediately by reply e-mail and then delete this message from your system, do not use the contents for any purpose whatsoever nor disclose them to anyone else.



Re: New Noise Reduction Features in SP1A External Speaker

Vianney Colombat
 


Hi Clint,

an LMS algorithm is used and the five positions are in 3dB steps. Also the volume adjustment has 5 positions and is in 3dB steps.

Vianney

Il 04/11/2019 13:07, Clint Chron ha scritto:

Hi Vianney,

 

Are any specs available for the amount of noise reduction available for each of the five filter positions?

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Vianney Colombat
Sent: Monday, November 4, 2019 1:26 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 

 

Hello all,

 

actually, the SP1 has been replaced by SP1A which has been redesigned to improve the quality of the filter that uses an Analog Device DSP for noise reduction. 

 

Vianney

 

From: "Clint Chron" <kiheiman@q.com>
To: <EladSDR@groups.io>
Date: Sun, 3 Nov 2019 13:20:51 -0700
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker
 

Hi Bill,

 

I suspect you have the older SP1 speaker.  The new SP1A file on the Elad Web site is dated October 2019.  The old SP1 speaker only had some passive audio filters (3 positions).   The new SP1A manual gives details on how to select the five different filters and how you can tell which filter is enabled via the three LEDs.

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Bill Kennedy via Groups.Io
Sent: Saturday, November 2, 2019 11:38 PM
To: EladSDR@groups.io
Subject: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 





From: Billknn <billknn@...>
Date: November 3, 2019 at 1:21:25 AM CDT
To: EladSDR@groups.io
Subject: Re:  New Noise Reduction Features in SP1A External Speaker

I have the SP1 and am not all that impressed, sad to say. If there are 5 levels of noise reduction, I’d be very surprised, especially since there is only a 3 position switch and position 1 is no filtering. Actually I get a terrible AC hum (ground loop?) using the speaker that I’m trying to track down. It’s the only thing in the shack that has that hum. With no antenna connected it is quiet. The Duo and the speaker are connected to the same power supply. I still have more testing to do. If I figure out how to get rid of the ac hum maybe my opinion would change.

It appears to be very solidly built and nicely matches the radio but I wouldn’t buy it again.

 




Le informazioni contenute in questo messaggio di posta elettronica sono riservate e confidenziali e ne è vietata la diffusione in qualunque modo eseguita (DL 196/2003). Qualora Lei non fosse la persona a cui il presente messaggio è destinato, La invitiamo ad eliminarlo e a non leggerlo, dandone gentilmente comunicazione al mittente.

The information contained in this e-mail and any attachments is confidential and may well also be legally privileged (DL 196/2003). If you are not among the named recipients, please notify the sender immediately by reply e-mail and then delete this message from your system, do not use the contents for any purpose whatsoever nor disclose them to anyone else.


Re: FDM-DUO ALC

Tony EI8JK
 

Thanks for all the replies and advice, guys.
All noted and I have most definitely learned something by asking the question.
That's the beauty of this forum.
73,
Tony.

On 04/11/2019 22:17, G8DQX list wrote:
Tony,

it may help to think of it this way. A Duo does not have ALC, nor does it have a slow-start heater supply, nor a thermionic valve output stage. The traditional reasons for needing ALC in a transceiver no longer apply. Nor do the reasons which required back-coupling of a so-called ALC voltage from an external amplifier to a transceiver.

A digital transceiver, such as the Duo, which generates RF directly from a D/A converter at the output frequency can, in essence, run open-loop, because the gain of the PA stage(s) post D/A is relatively small, in dB terms, and relatively unvarying. Thus any needed control may be applied in the DSP, rather than the analogue, domain. A similar argument applies if the transceiver drives an external amplifier of modern, solid-state, design.

So why did we ever use ALC? It was a bodge which worked using '60's technology. It allowed for both a degree of speech compression and avoidance of overdriving PAs (or external amplifiers). But note that speech compression and avoidance of overdriving are incompatible given a common mechanism. How do we know that it was a bodge? Just try finding a specification for what a given ALC voltage means, in terms of gain reduction or power output or even IMD. It's not there, merely a phono socket labelled ALC, but more accurately identified by Neil earlier!

The 2018 ARRL handbook puts it more prosaically in section 14.1.2:

"…Since we have absolute control over the sig-
nal level by altering samples in the radio, it
is generally better to set a maximum power
out in the radio and allow the signal chain to
make the appropriate adjustments than to rely
on ALC to adjust the levels when they are too
high for an amplifier.
"An ALC subsystem that is too active can
modulate the transmit signal. This results in
distortion that could be prevented by adjusting
the proper levels in the signal chain to start
with. This is why many digital mode guide-
lines specify that the ALC system be switched
off — to avoid unintentional distortion of the
signal by power control systems."
73,

Robin, G8DQX


On 04/11/2019 12:30, Tony EI8JK wrote:
Am I right in thinking that it's not possible to access the Duo's ALC?
In fact I can't find any reference to ALC in any Elad documentation.
Or is it a case of carefully setting the Windows audio drive levels, which is fraught with problems as every Windows update seems to reset the audio out to whatever MS thinks fit.
Thanks
Tony, EI8JK



Re: elad-gqrx wrapper for gqrx

Giovanni Franza
 

Hi Udo,
It is possible to use elad-gqrx with FDM DUO, with the limit that the samplerate is not programmable, and that the
command of frequency is one-way from gqrx (the tune settings in FDM DUO do not reflects to gqrx).
Simply connect your duo, go to the elad-gqrx folder and type ./elad-gqrx
Feel free to try and share your thoughts.

Regards,

Giovanni HB9EIK


Re: FDM-DUO ALC

Paul Jones
 

Same as Josh here, I’ve never run ALC on any of my radios, and also had/have a clean signal, driving the Duo into the DuoArt never a problem, and then using he DuoART to drive my old Alpha78, neve a problem, running 1500w, if you put a clean signal out of the Duo you should not have any need for it, I’ve run WSJT-X here with the Duo and Duo/DuoART and not had any complaints…

 

Tony: What are you trying to drive

 

Have a Radiolutionary Day!
Paul

--

Paul Jones - Elad USA Sales & Technical Support (USA)
emailsigfile
FDM-Duo, Duo-Art, FDM-DUOR,  FDM-S3, FDM-S2, FDM-S2, FDM-SW2, T-Mate

Visit http://www.eladit.com for the full range of Elad Products or USA Sales : https://shop.elad-usa.com/

Email Support Group - https://groups.io/g/EladSDR

Sales Phone: 312.320.8160

Support Email: support@... Sales Email: sales@...
Personal Email: Paul@...
 
 

 

 

From: EladSDR@groups.io <EladSDR@groups.io> On Behalf Of Josh Murray
Sent: Monday, November 4, 2019 15:23
To: EladSDR@groups.io
Subject: Re: [EladSDR] FDM-DUO ALC

 

My Mentor/Elmer told me not to bother connecting the ALC line, so I never have.  Always had a nice clean signal through not over-driving the amp and taking care to ask for regular feedback on my received signal quality.

 

Josh de M0JMO

 

 

On Mon, 4 Nov 2019 at 19:51, Klaus Brosche, DK3QN <dk3qn@...> wrote:

Might be a bit 'blunt', excuse me for that, but IMHO ALC-feedback
from an Amp into an Exciter/TRX is just about the very last thing
I would consider to make an TRX/Amp combination 'work'.

 

It's a backward feedback loop with all kinds of implications
included!

 

I'd rather set the DUOs RF output level such that the Final Amplifier
is running within it's desired linear amplification range/IMD range.

You do not need a high-spec SDR for checking the quality of your
transmitted signal. A simple RTL-stick will do, as long as you'll keep
it's RF input level (monitoring your TRX signal) within the units
dynamic range.

 

You'll then literally 'see' (waterfall) any changes of TRX drive power
into the Amp and what this does to the quality of your transmitted
RF signal.

 

I have done this kind of 'exercise' on the air with quite a couple of
my local club mates and they all were quite surprised in the end
about what they've sent-out before and after this exercise.
'After' = a non-offensive RF signal transmitted w/o losing any
signal strength at the receivers side.

 

Klaus, DK3QN

 

 

Am 04.11.2019 um 17:59 schrieb Tony EI8JK:

Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...

On 04/11/2019 16:50, MM6IXE wrote:

Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain

 

 

--

Many Thanks

Best Regards

Josh Murray


Re: FDM-DUO ALC

G8DQX list
 

Tony,

it may help to think of it this way. A Duo does not have ALC, nor does it have a slow-start heater supply, nor a thermionic valve output stage. The traditional reasons for needing ALC in a transceiver no longer apply. Nor do the reasons which required back-coupling of a so-called ALC voltage from an external amplifier to a transceiver.

A digital transceiver, such as the Duo, which generates RF directly from a D/A converter at the output frequency can, in essence, run open-loop, because the gain of the PA stage(s) post D/A is relatively small, in dB terms, and relatively unvarying. Thus any needed control may be applied in the DSP, rather than the analogue, domain. A similar argument applies if the transceiver drives an external amplifier of modern, solid-state, design.

So why did we ever use ALC? It was a bodge which worked using '60's technology. It allowed for both a degree of speech compression and avoidance of overdriving PAs (or external amplifiers). But note that speech compression and avoidance of overdriving are incompatible given a common mechanism. How do we know that it was a bodge? Just try finding a specification for what a given ALC voltage means, in terms of gain reduction or power output or even IMD. It's not there, merely a phono socket labelled ALC, but more accurately identified by Neil earlier!

The 2018 ARRL handbook puts it more prosaically in section 14.1.2:

"…Since we have absolute control over the sig-
nal level by altering samples in the radio, it
is generally better to set a maximum power
out in the radio and allow the signal chain to
make the appropriate adjustments than to rely
on ALC to adjust the levels when they are too
high for an amplifier.
"An ALC subsystem that is too active can
modulate the transmit signal. This results in
distortion that could be prevented by adjusting
the proper levels in the signal chain to start
with. This is why many digital mode guide-
lines specify that the ALC system be switched
off — to avoid unintentional distortion of the
signal by power control systems."
73,

Robin, G8DQX


On 04/11/2019 12:30, Tony EI8JK wrote:
Am I right in thinking that it's not possible to access the Duo's ALC?
In fact I can't find any reference to ALC in any Elad documentation.
Or is it a case of carefully setting the Windows audio drive levels, which is fraught with problems as every Windows update seems to reset the audio out to whatever MS thinks fit.
Thanks
Tony, EI8JK


Re: SW2 crashes after Windows updates #fdm-sw2 #fmd-s2

Ad Dieleman
 

Meanwhile I've found that there were additional USB-devices under the Human Interface Devices heading in Device Management that were enabled to power down. I unchecked all of them of course. I suspect that one of them named "HID-compatible digitizer" is the FDM-S2. Under the USB controllers there's also a mass storage device, an external HD that I use to store the I/Q recordings. It's now running a recording for several hours without issues, let's hope it'll last through the night.


Re: FDM-DUO ALC

 

Your welcome Tony, maybe their is another way, lots of smart people on here
Maybe someone can help u out
Good luck
Iain

On 4 Nov 2019, at 16:59, Tony EI8JK <ei8jk@...> wrote:

 Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...


On 04/11/2019 16:50, MM6IXE wrote:
Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain


Re: FDM-DUO ALC

Josh Murray <josh@...>
 

My Mentor/Elmer told me not to bother connecting the ALC line, so I never have.  Always had a nice clean signal through not over-driving the amp and taking care to ask for regular feedback on my received signal quality.

Josh de M0JMO


On Mon, 4 Nov 2019 at 19:51, Klaus Brosche, DK3QN <dk3qn@...> wrote:
Might be a bit 'blunt', excuse me for that, but IMHO ALC-feedback
from an Amp into an Exciter/TRX is just about the very last thing
I would consider to make an TRX/Amp combination 'work'.

It's a backward feedback loop with all kinds of implications
included!

I'd rather set the DUOs RF output level such that the Final Amplifier
is running within it's desired linear amplification range/IMD range.

You do not need a high-spec SDR for checking the quality of your
transmitted signal. A simple RTL-stick will do, as long as you'll keep
it's RF input level (monitoring your TRX signal) within the units
dynamic range.

You'll then literally 'see' (waterfall) any changes of TRX drive power
into the Amp and what this does to the quality of your transmitted
RF signal.

I have done this kind of 'exercise' on the air with quite a couple of
my local club mates and they all were quite surprised in the end
about what they've sent-out before and after this exercise.
'After' = a non-offensive RF signal transmitted w/o losing any
signal strength at the receivers side.

Klaus, DK3QN


Am 04.11.2019 um 17:59 schrieb Tony EI8JK:
Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...


On 04/11/2019 16:50, MM6IXE wrote:
Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain


--
Many Thanks

Best Regards

Josh Murray


Re: elad-gqrx wrapper for gqrx

Udo Isaenko
 

Very interesting.

Would such a nice thing also be possible for the FDM-DUO? Just to see the spectrum under Linux (x64 or the Raspi) would already be fine.

73
Udo, HB9ERD/DL3GN

Am 04.11.19 um 18:21 schrieb Giovanni Franza:

Hi all,
to simplify the usage of gqrx with S1/S2, I've wrote a wrapper that:
* loads S1/S2 firmware
* writes gqrx configuration file
* launches gqrx
* talks with gqrx (using tcp remote control) to read gqrx hardware frequency and set S1/S2
For now it is available (compiled, but with sourcecode) for Ubuntu and MAC
on the following links:
www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-ubuntu-x86.tgz <http://www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-ubuntu-x86.tgz>
www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-mac.tgz <http://www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-mac.tgz>
in the package it is also a README with useful informations (that I kindly suggest to read) and a compiled version of elad-fiermware.
Enjoy!


Re: FDM-DUO ALC

Klaus Brosche, DK3QN <dk3qn@...>
 

Might be a bit 'blunt', excuse me for that, but IMHO ALC-feedback
from an Amp into an Exciter/TRX is just about the very last thing
I would consider to make an TRX/Amp combination 'work'.

It's a backward feedback loop with all kinds of implications
included!

I'd rather set the DUOs RF output level such that the Final Amplifier
is running within it's desired linear amplification range/IMD range.

You do not need a high-spec SDR for checking the quality of your
transmitted signal. A simple RTL-stick will do, as long as you'll keep
it's RF input level (monitoring your TRX signal) within the units
dynamic range.

You'll then literally 'see' (waterfall) any changes of TRX drive power
into the Amp and what this does to the quality of your transmitted
RF signal.

I have done this kind of 'exercise' on the air with quite a couple of
my local club mates and they all were quite surprised in the end
about what they've sent-out before and after this exercise.
'After' = a non-offensive RF signal transmitted w/o losing any
signal strength at the receivers side.

Klaus, DK3QN


Am 04.11.2019 um 17:59 schrieb Tony EI8JK:

Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...


On 04/11/2019 16:50, MM6IXE wrote:
Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain



Re: elad-gqrx wrapper for gqrx

Giovanni Franza
 

Now it is also available for raspberry pi, here:
www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-raspberry.tgz

Enjoy!

Giovanni - HB9EIK


elad-gqrx wrapper for gqrx

Giovanni Franza
 

Hi all,
to simplify the usage of gqrx with S1/S2, I've wrote a wrapper that:
* loads S1/S2 firmware
* writes gqrx configuration file
* launches gqrx
* talks with gqrx (using tcp remote control) to read gqrx hardware frequency and set S1/S2
For now it is available (compiled, but with sourcecode) for Ubuntu and MAC
on the following links:
www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-ubuntu-x86.tgz
www.eladit.com/download/sdr/Linux/elad-gqrx-1.2-mac.tgz
in the package it is also a README with useful informations (that I kindly suggest to read) and a compiled version of elad-fiermware.

Enjoy!

Giovanni - HB9EIK


Re: FDM-DUO ALC

Neil Smith G4DBN
 

Hi Tony, I think the point is that ALC should have been left to wither on the vine back in the days of the thermionic valve, and we should be running linear systems and controlling the levels and gains to achieve the output level required.  Sadly, somewhere along the way, Microsoft decided they knew better, and that wantonly changing levels was an acceptable way to behave. (Pro-tip:  it is not)

ALC is definitely the spawn of Beelzebub though, and should have no place in any radio made since 1980.

Neil G4DBN


On 04/11/2019 16:59, Tony EI8JK wrote:
Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...


On 04/11/2019 16:50, MM6IXE wrote:
Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain

-- 
Neil
<a href="http://g4dbn.uk/"><small>g4dbn.uk</small></a>


Re: FDM-DUO ALC

Tony EI8JK
 

Thanks for that Iain.
Not really the answer I had hoped for ;-)
What I wanted was an ALC connection to run/control a non-Elad linear.
I thought that was a non runner though, so not unexpected.
Regards & 73
Tony...


On 04/11/2019 16:50, MM6IXE wrote:
Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain


Re: FDM-DUO ALC

 

Hi Tony

you are correct on both accounts, No alc meter, and yes u would need to adjust windows drive .

I asked the same question couple weeks ago, and was given a workaround for wsjtx, 

if u go back a few pages on forum, you will find the question from me
andbthe answer from Neil

regards

Iain


Re: FDM-DUO OS X

Giovanni Franza
 

Hi Guillermo,
without knowing the versions of DUO firmware and Bluduo it is hard to answer, but, as a rule of thumb, it is bettere to update BlueDUO when a new firmware is installed on DUO.
Last BlueDuo can be found here:
www.eladit.com/download/sdr/BLUEDUO/BlueDuo-0.23-2019-01-04.apk
It is aligned with last DUO firmware versions.
Regards,

Giovanni - HB9EIK


FDM-DUO ALC

Tony EI8JK
 

Am I right in thinking that it's not possible to access the Duo's ALC?
In fact I can't find any reference to ALC in any Elad documentation.
Or is it a case of carefully setting the Windows audio drive levels, which is fraught with problems as every Windows update seems to reset the audio out to whatever MS thinks fit.
Thanks
Tony, EI8JK


Re: FDM-DUO OS X

Guillermo
 

Thanks Neil.  Your post resolved it! 

How dumb of me to think that the USB RX port was THE port to use and not the USB TX one. 

I just assumed that since that was where the audio came from in SW2 that it would be the one for other digital apps.  Anyway, it is confusing.

I now have to resolve an issue I got today with a message (Win 10 notification) saying something like "Not enough USB resourses" or the like.

So lesson learned, thanks to you:

FOR SW2 USE USB RX

FOR OTHER DIGITAL APPS USE USB CAT AND USB TX

Could not have been simpler!


As a last problem: Last year I successfully built the USB dongle to use the BLUEDUO app on my android tablet.  Worked like a charm.  After I did the upgrades to the firmware the Blueduo doesn't work any more.  Just boots and shows nothing on the waterfall and shortly after it crashes.  Do you know if the upgrade requires me to look for a newer or older version of BLUEDUO?  Could that be it?

Again, many thanks!

73 de Guillermo - HK4KM


Re: New Noise Reduction Features in SP1A External Speaker

Clint Chron
 

Hi Vianney,

 

Are any specs available for the amount of noise reduction available for each of the five filter positions?

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Vianney Colombat
Sent: Monday, November 4, 2019 1:26 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 

 

Hello all,

 

actually, the SP1 has been replaced by SP1A which has been redesigned to improve the quality of the filter that uses an Analog Device DSP for noise reduction. 

 

Vianney

 

From: "Clint Chron" <kiheiman@q.com>
To: <EladSDR@groups.io>
Date: Sun, 3 Nov 2019 13:20:51 -0700
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker
 

Hi Bill,

 

I suspect you have the older SP1 speaker.  The new SP1A file on the Elad Web site is dated October 2019.  The old SP1 speaker only had some passive audio filters (3 positions).   The new SP1A manual gives details on how to select the five different filters and how you can tell which filter is enabled via the three LEDs.

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Bill Kennedy via Groups.Io
Sent: Saturday, November 2, 2019 11:38 PM
To: EladSDR@groups.io
Subject: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 





From: Billknn <billknn@...>
Date: November 3, 2019 at 1:21:25 AM CDT
To: EladSDR@groups.io
Subject: Re:  New Noise Reduction Features in SP1A External Speaker

I have the SP1 and am not all that impressed, sad to say. If there are 5 levels of noise reduction, I’d be very surprised, especially since there is only a 3 position switch and position 1 is no filtering. Actually I get a terrible AC hum (ground loop?) using the speaker that I’m trying to track down. It’s the only thing in the shack that has that hum. With no antenna connected it is quiet. The Duo and the speaker are connected to the same power supply. I still have more testing to do. If I figure out how to get rid of the ac hum maybe my opinion would change.

It appears to be very solidly built and nicely matches the radio but I wouldn’t buy it again.

 


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