Date   

Re: Tx / Soundcard levels

DAVID IW5BNL
 

Hi Andy,

Very good document.
Thank you!
I'm working on iq modulator.

Regards

David
IW5BNL


Il Ven 25 Set 2020, 18:41 Andy G4JNT <andy.g4jnt@...> ha scritto:
I've summarised my findings on audio levels, along with some details of using IQ mode in this document





Re: Looking for duo art #duo-art

 

On Thu, Sep 24, 2020 at 11:15 PM, Kevin Larcombe wrote:
PM
Sorry Kevin,
I cannot find this option.


Re: Tx / Soundcard levels

Andy G4JNT
 

I've summarised my findings on audio levels, along with some details of using IQ mode in this document





Re: Got It this morning!

Vianney Colombat
 


No need to light fire, it is already lit. The manual was supposed to be ready this week but there were interruptions, it's a priority for next days.

Vianney


Il 25/09/2020 17:31, Larry Dodd ha scritto:
Pete
Thanks Pete for your report. Enjoy your new Elad SDR. I’m sure the documentation will follow soon. 
Larry, K4LED 

On Sep 25, 2020, at 11:25 AM, Pete <p.briggs.garage@...> wrote:

The UPS guy delivered my S3 this morning! It was well packed and arrived in excellent condition It's a good looking machine.
Haven't powered it up yet but I will post some initial impressions later.
My only concern is that there is NO TECHNICAL/OPERATIONAL MANUAL or user information available yet.
As a former validator of USAF avionics technical manuals (C-5M) this is quite frustrating.
PAUL! Please light a fire under the appropriate person in Italy for the data/manual.
So now the learning curve begins anew.

Pete
_._,_._,_




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: Got It this morning!

Larry Dodd
 

Pete
Thanks Pete for your report. Enjoy your new Elad SDR. I’m sure the documentation will follow soon. 
Larry, K4LED 

On Sep 25, 2020, at 11:25 AM, Pete <p.briggs.garage@...> wrote:

The UPS guy delivered my S3 this morning! It was well packed and arrived in excellent condition It's a good looking machine.
Haven't powered it up yet but I will post some initial impressions later.
My only concern is that there is NO TECHNICAL/OPERATIONAL MANUAL or user information available yet.
As a former validator of USAF avionics technical manuals (C-5M) this is quite frustrating.
PAUL! Please light a fire under the appropriate person in Italy for the data/manual.
So now the learning curve begins anew.

Pete


Got It this morning!

Pete
 

The UPS guy delivered my S3 this morning! It was well packed and arrived in excellent condition It's a good looking machine.
Haven't powered it up yet but I will post some initial impressions later.
My only concern is that there is NO TECHNICAL/OPERATIONAL MANUAL or user information available yet.
As a former validator of USAF avionics technical manuals (C-5M) this is quite frustrating.
PAUL! Please light a fire under the appropriate person in Italy for the data/manual.
So now the learning curve begins anew.

Pete


Re: ART DUO TUNE / Panadapter Display anomaly

Vianney Colombat
 


It probably happens because the FDM-DUO doesn't assert the PTT OUT (which goes to the DUO-ART PTT IN) during TUNE mode. I guess menu 25 of the DUO-ART is "Force To No" and so menu 56 of the FDM-DUO is "NO". Note that enabling PTT OUT during TUNE mode will enable the Power Amplifier of the DUO-ART, you can adjust the FDM-DUO power output during TUNE mode with menu 55 of the FDM-DUO.

Vianney

Il 09/09/2020 13:51, G8NRY ha scritto:

[Edited Message Follows]

Hi all, I have my DUO-ART 60 set in View 4 to show the Panadapter and switch to FWD/REV meters when I transmit. All works as expected.
But when I start the TUNE sequence the display stays in Panadapter (Receive) mode and doesn't switch to the power meter display like it does in any other TX mode.
I can see the FWD/REV power changing on the FDM-DUO display, but not on the actual ATU/PA which seems a bit of an oversight at least!
Is this a configuration issue or a limitation with the ART software?
73 Paul
_._,_._,_



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: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Klaus Brosche, DK3QN
 

The 'Boucherot' filter is also known as the 'Zobel' filter in HiFi amp output stages.

Klaus, DK3QN


Am 24.09.2020 um 22:49 schrieb Klaus Brosche:

As you wrote, you are loading the output with 4.7 ohms in series with cap. Which results, as your
indications say,  in an LPF at minus 3dB @ 50KHz.

I have currently no way of verifying that. I don't have my Ham Radio Laptop at hand right now
with the simulation software. It is just my guess.
So, maybe I'm wrong. In such case: forgive me ;-)

Klaus, DK3QN


Am 24.09.2020 um 22:36 schrieb Ad Dieleman:
I don't think that the interference comes from spurious switching signals from a class D amplifier: the 2.4 MHz signals disappears completely when loading the output with a low enough resistance, i.e. no high-frequency filtering at all. The filter I applied also doesn't really filter out HF signals, it just loads the output with 4.7 ohm for frequencies over roughly 50 kHz, this being the 3 dB cutoff point. So I still think that the output stage is oscillating under certain circumstances, be it a class D amplifier or something else.




Re: Looking for duo art #duo-art

Kevin Larcombe
 

Hi Alessandro,

Sorry for the delay, can you send me a PM.

Thanks

Kevin


Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Klaus Brosche, DK3QN
 

As you wrote, you are loading the output with 4.7 ohms in series with cap. Which results, as your
indications say,  in an LPF at minus 3dB @ 50KHz.

I have currently no way of verifying that. I don't have my Ham Radio Laptop at hand right now
with the simulation software. It is just my guess.
So, maybe I'm wrong. In such case: forgive me ;-)

Klaus, DK3QN


Am 24.09.2020 um 22:36 schrieb Ad Dieleman:

I don't think that the interference comes from spurious switching signals from a class D amplifier: the 2.4 MHz signals disappears completely when loading the output with a low enough resistance, i.e. no high-frequency filtering at all. The filter I applied also doesn't really filter out HF signals, it just loads the output with 4.7 ohm for frequencies over roughly 50 kHz, this being the 3 dB cutoff point. So I still think that the output stage is oscillating under certain circumstances, be it a class D amplifier or something else.



Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Ad Dieleman
 
Edited

I don't think that the interference comes from spurious switching signals from a class D amplifier: the 2.4 MHz signal disappears completely when loading the output with a low enough resistance, i.e. no high-frequency filtering at all. The filter I applied also doesn't really filter out HF signals, it just loads the output with 4.7 ohm for frequencies over roughly 50 kHz, this being the 3 dB cutoff point. So I still think that the output stage is oscillating under certain circumstances, be it a class D amplifier or something else.


Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Klaus Brosche, DK3QN
 

Hi Andy,

That's exactly was I was wondering about :-))

The average designs around this class-D chip family go w/o any LPF at the output.
I do not know how this is implemented in the DUO(r).

In case the outputs (stereo) are not LPF-limited, the PAM-xxxx devices turn
into 'transmitters', as is true for any class-D amp, especially if speaker/headphone
cables are longer than a few inches/centimeters!

Thus, a proper designed LPF at the amp output is a real 'must' with such kind
of amps.

The 'PAMs' are typically used in low power one-box FM receivers with internal
speakers and a very short cable connection between PAM-xxxx out and the
(internal) speaker chassis.

Klaus, DK3QN


Am 24.09.2020 um 22:01 schrieb Andy G4JNT:

This sort of device



On Thu, 24 Sep 2020 at 20:58, Klaus Brosche <klaus.brosche@...> wrote:
Possibly one of these low power class-D PAM-xxxx chips?

Klaus, DK3QN

Am 24.09.2020 um 20:52 schrieb Andy G4JNT:
I saw something like that.  I guess the Duo might use a Class-D switch-mode audio amplifier chip for speaker and headphones
There's no real reason NOT to use one in that position, they're very efficient.



On Thu, 24 Sep 2020 at 19:35, Ad Dieleman <addieleman@...> wrote:
This afternoon I was doing some measurements on audio signals on the DUOr's headphone outputs. Suddenly I saw a 2.4 MHz signal on my oscilloscope with an amplitude between 0.5 and 1 Vpp. The occurrence of that signal depends on the length of wire connected to the headphone output and crucially occurs most often when no load is present apart from the high-impedance oscilloscope input. Once the output is loaded with 10 ohms or so the 2.4 MHz disappears. I already use a ferrite core through which the headphone cord is wired but that doesn't suppress it. Ultimately I made a Boucherot filter-like setup, connecting a resistor of 4,7 ohm and a capacitor of 612 nF in series across the output. See the picture. No more interfering signals this way. I'd suspect the audio amplifier starts to oscillate under certain load conditions.



The filter box. Decided to resist the temptation to open the radio, so built a separate box to be inserted between loudspeaker/headphone and the radio output.




Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Andy G4JNT
 

This sort of device



On Thu, 24 Sep 2020 at 20:58, Klaus Brosche <klaus.brosche@...> wrote:
Possibly one of these low power class-D PAM-xxxx chips?

Klaus, DK3QN

Am 24.09.2020 um 20:52 schrieb Andy G4JNT:
I saw something like that.  I guess the Duo might use a Class-D switch-mode audio amplifier chip for speaker and headphones
There's no real reason NOT to use one in that position, they're very efficient.



On Thu, 24 Sep 2020 at 19:35, Ad Dieleman <addieleman@...> wrote:
This afternoon I was doing some measurements on audio signals on the DUOr's headphone outputs. Suddenly I saw a 2.4 MHz signal on my oscilloscope with an amplitude between 0.5 and 1 Vpp. The occurrence of that signal depends on the length of wire connected to the headphone output and crucially occurs most often when no load is present apart from the high-impedance oscilloscope input. Once the output is loaded with 10 ohms or so the 2.4 MHz disappears. I already use a ferrite core through which the headphone cord is wired but that doesn't suppress it. Ultimately I made a Boucherot filter-like setup, connecting a resistor of 4,7 ohm and a capacitor of 612 nF in series across the output. See the picture. No more interfering signals this way. I'd suspect the audio amplifier starts to oscillate under certain load conditions.



The filter box. Decided to resist the temptation to open the radio, so built a separate box to be inserted between loudspeaker/headphone and the radio output.



Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Klaus Brosche, DK3QN
 

Possibly one of these low power class-D PAM-xxxx chips?

Klaus, DK3QN

Am 24.09.2020 um 20:52 schrieb Andy G4JNT:

I saw something like that.  I guess the Duo might use a Class-D switch-mode audio amplifier chip for speaker and headphones
There's no real reason NOT to use one in that position, they're very efficient.



On Thu, 24 Sep 2020 at 19:35, Ad Dieleman <addieleman@...> wrote:
This afternoon I was doing some measurements on audio signals on the DUOr's headphone outputs. Suddenly I saw a 2.4 MHz signal on my oscilloscope with an amplitude between 0.5 and 1 Vpp. The occurrence of that signal depends on the length of wire connected to the headphone output and crucially occurs most often when no load is present apart from the high-impedance oscilloscope input. Once the output is loaded with 10 ohms or so the 2.4 MHz disappears. I already use a ferrite core through which the headphone cord is wired but that doesn't suppress it. Ultimately I made a Boucherot filter-like setup, connecting a resistor of 4,7 ohm and a capacitor of 612 nF in series across the output. See the picture. No more interfering signals this way. I'd suspect the audio amplifier starts to oscillate under certain load conditions.



The filter box. Decided to resist the temptation to open the radio, so built a separate box to be inserted between loudspeaker/headphone and the radio output.



Re: DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Andy G4JNT
 

I saw something like that.  I guess the Duo might use a Class-D switch-mode audio amplifier chip for speaker and headphones
There's no real reason NOT to use one in that position, they're very efficient.



On Thu, 24 Sep 2020 at 19:35, Ad Dieleman <addieleman@...> wrote:
This afternoon I was doing some measurements on audio signals on the DUOr's headphone outputs. Suddenly I saw a 2.4 MHz signal on my oscilloscope with an amplitude between 0.5 and 1 Vpp. The occurrence of that signal depends on the length of wire connected to the headphone output and crucially occurs most often when no load is present apart from the high-impedance oscilloscope input. Once the output is loaded with 10 ohms or so the 2.4 MHz disappears. I already use a ferrite core through which the headphone cord is wired but that doesn't suppress it. Ultimately I made a Boucherot filter-like setup, connecting a resistor of 4,7 ohm and a capacitor of 612 nF in series across the output. See the picture. No more interfering signals this way. I'd suspect the audio amplifier starts to oscillate under certain load conditions.



The filter box. Decided to resist the temptation to open the radio, so built a separate box to be inserted between loudspeaker/headphone and the radio output.


DUOr interference from headphone outputs #eladduo #fdm-duor #duor

Ad Dieleman
 

This afternoon I was doing some measurements on audio signals on the DUOr's headphone outputs. Suddenly I saw a 2.4 MHz signal on my oscilloscope with an amplitude between 0.5 and 1 Vpp. The occurrence of that signal depends on the length of wire connected to the headphone output and crucially occurs most often when no load is present apart from the high-impedance oscilloscope input. Once the output is loaded with 10 ohms or so the 2.4 MHz disappears. I already use a ferrite core through which the headphone cord is wired but that doesn't suppress it. Ultimately I made a Boucherot filter-like setup, connecting a resistor of 4,7 ohm and a capacitor of 612 nF in series across the output. See the picture. No more interfering signals this way. I'd suspect the audio amplifier starts to oscillate under certain load conditions.



The filter box. Decided to resist the temptation to open the radio, so built a separate box to be inserted between loudspeaker/headphone and the radio output.


Re: ELAD FDM-S3 USA Shipping Date

Larry Dodd
 

Thanks Paul. Appreciate that news. Looking forward to receiving the S3. Thanks to all at Elad for producing this top of the line SDR. 

Larry, K4LED 


Re: Looking for duo art #duo-art

 

Hi Kevin
can you give me your email?
Mine is ik2xrw@...

Thanks.


Tmate2: adjusting AUX Output Audio

Otso Ylönen
 

Hi,
 
I cjust reated the following feature request to Elad Support:
 
It is possible to adjust the primnary audio output of each VRX using the Tmate2 now. However, ability to adjust the secondary volume would be more useful. In order to access more than one audio channel via an audio (recording) application simultaneously, one has to use VAC or similar, and that means that only the secondary audio channels of each VRX are in use.

Proposal: add a configuration option for Tmate2 settings to allow selection between the primary/Main and secondary/AUX outputs.
 
BR, Otso


Re: ELAD FDM-S3 USA Shipping Date

Paul Jones
 

Larry, 

First batch has gone out, Hoping next shipment from italy within a few weeks, I just checked and believe it or not you are next on the list, ;) so you’ll be first once they arrive...

Paul EladUSA 


On Sep 23, 2020, at 21:52, Larry Dodd <101science@...> wrote:


Any estimates for S3 shipping dates in the USA? 
Thanks,
Larry, K4LED 

On Sep 23, 2020, at 3:09 AM, Fenu <fenu@...> wrote:

Hello,
I have write two emails to Elad Europe in Italy to try preorder the S3.
I just keep no answer from there. What's wrong with this company?
Is the S3 only sold in the US or what? Even if the website is not ready, an email can definitely be answered.

73
Fernando

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