Date   

Replacement Knob for DuoR

Dan Robinson
 

Has anyone found a suitable replacement or exact same knob 
for the DuoR?

Thanks...


Re: Newer MD3 Digital AM in North America... Codecs or support for Elad?

Chris Mackerell
 

Paying a license fee is the only way you'll get
"HD Radio" decoding. It's the US free enterprise
system at work. It is a totally commercial standard.
You want it? You buy it!

73 Chris

On 2021-05-31 17:01, Winston wrote:
Paying for license upgrades to enable additional decoding modes — similar to how Uniden charges for scanner upgrade keys — would probably be popular with many users, including myself.  


Re: Newer MD3 Digital AM in North America... Codecs or support for Elad?

Winston
 

Paying for license upgrades to enable additional decoding modes — similar to how Uniden charges for scanner upgrade keys — would probably be popular with many users, including myself.  


Re: Newer MD3 Digital AM in North America... Codecs or support for Elad?

Bjarne Mjelde
 

Not pretending to respond on behalf of Elad - just a general comment.
The so-called HD format is proprietary, and Ibiquity (now: DTS) seem to make their money from both the receiver side and the transmitter side in the form of licenses. Even if it was possible to enable HD with current SDRs (without having to add chipsets), my guess is that the licensing fees would be prohibitive for the limited market of amateur-grade SDRs. I'd also guess that only a fraction of our marked would be interested in HD Radio as DX targets.
--
Bjarne Mjelde
arcticdx.blogspot.com
Remote receivers: 
arcticsdr.ddns.net:8073/
kongsdr.ddns.net:8074


Newer MD3 Digital AM in North America... Codecs or support for Elad?

Darren Hennig
 

Hi all, 

Just a quick question for Paul and the gang at Elad. We are starting to see an insurgence of new MD3 mode digital AM in mainly the US, but I cannot find whether this mode will be supported eventually or if it is in work. If it is being planned to be an add on, or there's a third party codec coming, this would be good to know. 

For now it is not an issue, but I can see this creating a real challenge in the not-too-distant future - I really wish DRM had taken hold in N. Am., instead of this goofy IBOC/Ubiquity format. DRM seems to work pretty well in the Elad DUOr, though not a lot of DX stations in the middle of the continent have enough signal to stream well right now. 

Will there be a MD3 support for North America coming shortly, Paul? TIA!
--
Darren Hennig,
VE4VE - Winnipeg MB Canada
_____________________
ELAD DUOr/WellBrook ALA-100LNM antenna (4.8m Hexagonal loop) 
CLRdsp (when used standalone)


Elad FDM Duo

ian Hatton (via Dropbox)
 

Hi Guys
I have just purchased a 2nd hand Elad FDM Duo I have it up and running with FDM-sw2 software but cannot get the CAT to work once I plug the usb lead into the cat port it makes the bleep sound but does not search or install any drivers ??? I have tried different usb ports leads everything ?? just cant figure this one out no commport showing in device mangaer any help much appreciated
rgds Ian


Spurious carrier on FDM-SW2 display

Antony Watts
 

Radio tuned manually to 14,200,000. FDM-SW2 centred at same. Spurious carrier about +10-15dB up at 14,143,000. Spurious moves with Radio tuning always same distance below dial.
Another weak spurious at 14,263,000...

Any ideas?

[Set up AL-705 loop -> MAT125E auto tuner -> FDM-DUO -> iMac running W10 under Parallels -> FDM-SW2]


#eladsw2 Loop delay for TX message #eladsw2

Jean Louis Maridet
 

Hi all,

I try to transmit repeatedly a recorded message.
Does anyone know how to set the delay of the transmission loop  (delay between TX periods) in the Advanced TX window of SW2?

Thanks 
Jean-Louis F5DYD


Re: Waterfall display slightly offset from actual signal strength display

Paul Jones
 

Sam,

It just looks like you aren’t tuned correctly, set the step to 1khz, that will eliminate the .157 off your signal then your should be spot on, even without the gos hooked up the radio is very accurate. It’s just a tuning issue I believe 

Paul EladUSA 


On May 23, 2021, at 09:02, Neil Smith G4DBN <neil@...> wrote:



Hi Ron, how wide are the FFT bins you are using?   On the DUO at max zoom on the main waterfall, with a bin size of 11.7 Hz, the peak is around 6Hz off.  On the IF windows at 2.9 Hz bins, it is around 1.5 Hz off. The reason is just that the peak for my 10.00000000MHz signal is "somewhere" in a bin that happens to be from (perhaps) 10000000 Hz to 10000011.7 Hz instead of 9999994.65 to 10000005.35 Hz, when it would appear to peak at 10.000000 exactly.

<dbjfibjhoallilci.png>

IF window, showing peak at about 1.5 Hz HF of the 10.000600 Hz point (I'm using CW offset of 600 Hz). Sometimes, you'll find the peak is in the middle of a bin, but on average it will be around 6Hz off from the true frequency simply because that's how the maths work. (or "how the math works" for those who use the singular shortened form of "mathematics").

You should be able to calculate the bin edges and make any necessary adjustments.  However, if you really want to know the exact frequency, and your radio is locked to a precision 10 MHz reference, you can use Spectrum Lab on a long integration FFT (262144 bins perhaps) to check your PC sourd card clock calibration against a precise tone generated from your reference, then use Speclab to look at the actual frequency:

<mkclmmnkdciemikc.png>

That is monitoring drift of an OCXO at 1kHz offset and 512k bins in Speclab. The DUO shows it at 1006 Hz offset approximately.

Neil G4DBN

On 23/05/2021 13:09, Ron Hunsicker via groups.io wrote:
Srinivas:  I see something similar with my S3. 

So we are not comparing apples and oranges:  I have the OCXO version and it runs 24/7, so it should have stabilized.  Also, I have a GNSS antenna attached and am advised that I have a lock. 

I just tuned to WWV on 10 MHz.  When I expand the main waterfall, the red arrow head is centered to the right of the carrier (higher in frequency) by something less than 10 Hz, but more than 5 Hz.  When I expand the IF waterfall, it appears similarly offset to the right.

I think that this is an interesting observation rather than an annoying or concerning one.  I have to keep reminding myself that the S3 is a radio, not a laboratory instrument.  Consider that, at 10 MHz, 7 Hertz is 7 parts in 10 million; less than a part per million.  (By all accounts, less than 1 part per million of almost anything will not cause cancer.)

Remember slide rule dials?  Remember tuning with a piece of white cardboard with small marks on it noting the known (We hoped!) locations of BBC, Radio Moscow, HCJYB, and VOA stations and interpolating between these marks?  The mark was probably 5 KHz wide, so, at 10 MHz, 5 parts in 10,000; 1 part in 2000. 

And we were happy.  Modern radios have spoiled me!


Ron Hunsicker


Re: Waterfall display slightly offset from actual signal strength display

Srinivas Chennupaty
 

Ron _ Fascinating explanation! Thank you!! the technology outstrips my capabiilty :-) 

On Sunday, May 23, 2021, 06:02:53 AM PDT, Neil Smith G4DBN <neil@...> wrote:


Hi Ron, how wide are the FFT bins you are using?   On the DUO at max zoom on the main waterfall, with a bin size of 11.7 Hz, the peak is around 6Hz off.  On the IF windows at 2.9 Hz bins, it is around 1.5 Hz off. The reason is just that the peak for my 10.00000000MHz signal is "somewhere" in a bin that happens to be from (perhaps) 10000000 Hz to 10000011.7 Hz instead of 9999994.65 to 10000005.35 Hz, when it would appear to peak at 10.000000 exactly.

IF window, showing peak at about 1.5 Hz HF of the 10.000600 Hz point (I'm using CW offset of 600 Hz). Sometimes, you'll find the peak is in the middle of a bin, but on average it will be around 6Hz off from the true frequency simply because that's how the maths work. (or "how the math works" for those who use the singular shortened form of "mathematics").

You should be able to calculate the bin edges and make any necessary adjustments.  However, if you really want to know the exact frequency, and your radio is locked to a precision 10 MHz reference, you can use Spectrum Lab on a long integration FFT (262144 bins perhaps) to check your PC sourd card clock calibration against a precise tone generated from your reference, then use Speclab to look at the actual frequency:

That is monitoring drift of an OCXO at 1kHz offset and 512k bins in Speclab. The DUO shows it at 1006 Hz offset approximately.

Neil G4DBN

On 23/05/2021 13:09, Ron Hunsicker via groups.io wrote:
Srinivas:  I see something similar with my S3. 

So we are not comparing apples and oranges:  I have the OCXO version and it runs 24/7, so it should have stabilized.  Also, I have a GNSS antenna attached and am advised that I have a lock. 

I just tuned to WWV on 10 MHz.  When I expand the main waterfall, the red arrow head is centered to the right of the carrier (higher in frequency) by something less than 10 Hz, but more than 5 Hz.  When I expand the IF waterfall, it appears similarly offset to the right.

I think that this is an interesting observation rather than an annoying or concerning one.  I have to keep reminding myself that the S3 is a radio, not a laboratory instrument.  Consider that, at 10 MHz, 7 Hertz is 7 parts in 10 million; less than a part per million.  (By all accounts, less than 1 part per million of almost anything will not cause cancer.)

Remember slide rule dials?  Remember tuning with a piece of white cardboard with small marks on it noting the known (We hoped!) locations of BBC, Radio Moscow, HCJYB, and VOA stations and interpolating between these marks?  The mark was probably 5 KHz wide, so, at 10 MHz, 5 parts in 10,000; 1 part in 2000. 

And we were happy.  Modern radios have spoiled me!


Ron Hunsicker


Re: Waterfall display slightly offset from actual signal strength display

Neil Smith G4DBN
 

On my main waterfall screen, I have this, showing 11.7 Hz per point (what I called FFT bin size):

and on the IF screen on my SW2, is says 2.9 Hz/point

The fast fourier transform calculation takes the full bandwidth of the digital stream coming from the FPGA front end and makes a calculation of the amount of energy in a specific frequency range (the "bin size" I mentioned) over a specified time period.  The math(s) behind it is one of the wonders of the world. There are subtleties around the overlap with adjacent bins.

Usingf MATLAB or Octave, you can play with the parameters, but a simple example is if you generate a couple of tones at 50 Hz and 120 Hz, then add noise, like this:

Fs = 1000;            % Sampling frequency                   
T = 1/Fs;             % Sampling period      
L = 1500;             % Length of signal
t = (0:L-1)*T;        % Time vector
S = 0.7*sin(2*pi*50*t) + sin(2*pi*120*t);
X = S + 2*randn(size(t));
plot(1000*t(1:50),X(1:50))
title('Signal Corrupted with Zero-Mean Random Noise')
xlabel('t (milliseconds)')
ylabel('X(t)')

you get a signal like this:

and it is hard to see the two frequencies from that time-domain signal.

However, if you run a fast fourier transform on the signal at the sampling rate, you can calculate the amount of signal in each increment of frequency:

Y = fft(X);

P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);

f = Fs*(0:(L/2))/L;
plot(f,P1)
title('Single-Sided Amplitude Spectrum of X(t)')
xlabel('f (Hz)')
ylabel('|P1(f)|')

and you end up with a spectrum that you can use to create the intensities of the display on one line of a waterfall.  The size of each bin depends on how fast you are taking the samples.  The faster you sample, the wider each bin becomes.

The whole subject area is fascinating, and the math(s) gets intricate, although the solutions in sotware have probably had more academic effort expended on improving the speed and efficiency of processing than almost any other set of algorithms.

I'm sure someone who knows this stuff better could offer a more cogent explanation.  There is a nice fun read at https://www.analog.com/media/en/training-seminars/design-handbooks/Software-Defined-Radio-for-Engineers-2018/SDR4Engineers_CH02.pdf if you have a spare couple of hours!

Neil G4DBN


On 23/05/2021 16:41, Ron Hunsicker via groups.io wrote:
Neil, thanks, an explanation that I found interesting--"Oh, that's why it does that!"

For what I do, other than looking odd at high resolution, the offset creates no difficulty.  In AM mode, it really does not matter and in sideband I tune by ear.  (What's the likelihood that my 7 parts in 10 million is more accurate than the frequency control of their machine?)

If you are willing to continue to be helpful, what is an "FFT bin?"  The vertical lines in the graphical part of the IF display?  Something else?


Ron

p.s., I'm a "math, science, and engineering guy," not a "maths, science, and engineering guy!"
-- 
Neil
http://g4dbn.uk


Re: Waterfall display slightly offset from actual signal strength display

Ron Hunsicker
 

Neil, thanks, an explanation that I found interesting--"Oh, that's why it does that!"

For what I do, other than looking odd at high resolution, the offset creates no difficulty.  In AM mode, it really does not matter and in sideband I tune by ear.  (What's the likelihood that my 7 parts in 10 million is more accurate than the frequency control of their machine?)

If you are willing to continue to be helpful, what is an "FFT bin?"  The vertical lines in the graphical part of the IF display?  Something else?


Ron

p.s., I'm a "math, science, and engineering guy," not a "maths, science, and engineering guy!"


Re: ART factory reset??

Jim AJ8S
 

Me too. The loud fans is my only real compaint. Even with the SSB mode the fans get quite loud.


Re: Waterfall display slightly offset from actual signal strength display

Neil Smith G4DBN
 

Hi Ron, how wide are the FFT bins you are using?   On the DUO at max zoom on the main waterfall, with a bin size of 11.7 Hz, the peak is around 6Hz off.  On the IF windows at 2.9 Hz bins, it is around 1.5 Hz off. The reason is just that the peak for my 10.00000000MHz signal is "somewhere" in a bin that happens to be from (perhaps) 10000000 Hz to 10000011.7 Hz instead of 9999994.65 to 10000005.35 Hz, when it would appear to peak at 10.000000 exactly.

IF window, showing peak at about 1.5 Hz HF of the 10.000600 Hz point (I'm using CW offset of 600 Hz). Sometimes, you'll find the peak is in the middle of a bin, but on average it will be around 6Hz off from the true frequency simply because that's how the maths work. (or "how the math works" for those who use the singular shortened form of "mathematics").

You should be able to calculate the bin edges and make any necessary adjustments.  However, if you really want to know the exact frequency, and your radio is locked to a precision 10 MHz reference, you can use Spectrum Lab on a long integration FFT (262144 bins perhaps) to check your PC sourd card clock calibration against a precise tone generated from your reference, then use Speclab to look at the actual frequency:

That is monitoring drift of an OCXO at 1kHz offset and 512k bins in Speclab. The DUO shows it at 1006 Hz offset approximately.

Neil G4DBN

On 23/05/2021 13:09, Ron Hunsicker via groups.io wrote:
Srinivas:  I see something similar with my S3. 

So we are not comparing apples and oranges:  I have the OCXO version and it runs 24/7, so it should have stabilized.  Also, I have a GNSS antenna attached and am advised that I have a lock. 

I just tuned to WWV on 10 MHz.  When I expand the main waterfall, the red arrow head is centered to the right of the carrier (higher in frequency) by something less than 10 Hz, but more than 5 Hz.  When I expand the IF waterfall, it appears similarly offset to the right.

I think that this is an interesting observation rather than an annoying or concerning one.  I have to keep reminding myself that the S3 is a radio, not a laboratory instrument.  Consider that, at 10 MHz, 7 Hertz is 7 parts in 10 million; less than a part per million.  (By all accounts, less than 1 part per million of almost anything will not cause cancer.)

Remember slide rule dials?  Remember tuning with a piece of white cardboard with small marks on it noting the known (We hoped!) locations of BBC, Radio Moscow, HCJYB, and VOA stations and interpolating between these marks?  The mark was probably 5 KHz wide, so, at 10 MHz, 5 parts in 10,000; 1 part in 2000. 

And we were happy.  Modern radios have spoiled me!


Ron Hunsicker


Re: Waterfall display slightly offset from actual signal strength display

Ron Hunsicker
 

Srinivas:  I see something similar with my S3. 

So we are not comparing apples and oranges:  I have the OCXO version and it runs 24/7, so it should have stabilized.  Also, I have a GNSS antenna attached and am advised that I have a lock. 

I just tuned to WWV on 10 MHz.  When I expand the main waterfall, the red arrow head is centered to the right of the carrier (higher in frequency) by something less than 10 Hz, but more than 5 Hz.  When I expand the IF waterfall, it appears similarly offset to the right.

I think that this is an interesting observation rather than an annoying or concerning one.  I have to keep reminding myself that the S3 is a radio, not a laboratory instrument.  Consider that, at 10 MHz, 7 Hertz is 7 parts in 10 million; less than a part per million.  (By all accounts, less than 1 part per million of almost anything will not cause cancer.)

Remember slide rule dials?  Remember tuning with a piece of white cardboard with small marks on it noting the known (We hoped!) locations of BBC, Radio Moscow, HCJYB, and VOA stations and interpolating between these marks?  The mark was probably 5 KHz wide, so, at 10 MHz, 5 parts in 10,000; 1 part in 2000. 

And we were happy.  Modern radios have spoiled me!


Ron Hunsicker


Re: ART factory reset??

la1rq@...
 

And

An other thing, there is plenty of gain in my ART, need only 1W input to get 120 out with 0 or 1 dB att. But I would have designed the cooling system more YL/XYL-acceptable - less noise from bigger diameter fans...

73 again gl and gn

de Espen


Re: ART factory reset??

la1rq@...
 
Edited

All I can see in the manual is menu item 90 : Set default parameters.
Otherwise 1. reset params, update/reload firmware, enter network params, connect to elads ip-address, update software.

If not, insert a support ticket to eladit.com/support at http://eladit.com/en/support.php
Let Giovanni HB9EIK do the trick ;-)

GL 73
Espen

Elad FDM-Duo RED for portable / SOTA 
Elad +DuoART120 @indoor...
Would maybe been better with possibly 60W  PO on 13,8V DC supply OR 230VAC.


Re: False Errors / Elad Duo ART 100 and FDM

gcoxuk@googlemail.com
 

Thanks Essen.

I tried all that. Was 5db initially then set to 2db then zero.  SWR target set to 1; I’ll try 1.3 and see.
Will share the result!

Kr
G


On 22 May 2021, at 22:29, la1rq via groups.io <la1rq@...> wrote:

Hi Geoff,

I remember that the target for tuner (menu item 22) is set quite low by default, and the better VSWR you require, the longer it may take. Try to adjust the target i.e. to 1,3, 1.4 ?

Your FDM-Duo might see a lower swr if you use menu item 21 Force Attenuator (input attenuator) to 2 or 3 dB...

And inserting a ticket to support http://eladit.com/en/support.php will give you help from the designer. He is able to do remote support on your device when you connect the Duo-ART to internet.

73 de
Espen
LA1RQ


Re: False Errors / Elad Duo ART 100 and FDM

la1rq@...
 

And btw, a software and firmware update or eventually reload might help too.
check:
http://eladit.com/download/sdr/DUO-ART%20Amplifier%2060W%20and%20120W%20versions/index.php?lang=EN

I have had good experience inserting ticket to Elad Support, specially regarding remote control (which runs via the Duo-ARTs internet connection), it resulted in
1. Giovanni contacted me, and I set up the ART as requested connected to internet, and he made his "magic" and the ART was cured.
2.  I also had a pair of minor issues regarding setup of the EladRemote program, and
3.  Requested CW monitor on internal in PC rather than waiting for tones over internet from the radio 250km away, which worked to some extent,
     but brought up possible problems with USB/interrupt/power, as I had to use an external USB to serial converter and key one of the lines to gnd to make dits and dahs. The Duo made probably correct morse but the sidetone from pc's needs some more development or redesign.

73 de //Espen
LA1RQ


Re: False Errors / Elad Duo ART 100 and FDM

la1rq@...
 

Hi Geoff,

I remember that the target for tuner (menu item 22) is set quite low by default, and the better VSWR you require, the longer it may take. Try to adjust the target i.e. to 1,3, 1.4 ?

Your FDM-Duo might see a lower swr if you use menu item 21 Force Attenuator (input attenuator) to 2 or 3 dB...

And inserting a ticket to support http://eladit.com/en/support.php will give you help from the designer. He is able to do remote support on your device when you connect the Duo-ART to internet.

73 de
Espen
LA1RQ

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