Date   

Re: FDM-DUO overload issues

Steve Knell
 

Thanks for following up Neil.  I just did a couple of hours in WPX CW.  Good conditions on 20 with very long (KH6) and very short skip (PA4) at the same time.  I probably heard ghost signals around 10 times during that period (they are easy to spot - they don't sound at all like real signals).  It's definitely a bit less intrusive with CW REV = Y, so I'll stick with that setting.  Now I have a better idea what's going on I've raised a case with Vianney to see if they have a fix for this.  Seems to be stop band breakthrough rather than anything to do with ADC overload.  I also think it only takes a single strong signal to get the effect, rather than any mixing, but I'm not 100% on that.  I don't have any test gear here, just my ears and one of those is defective ;)


Re: FDM-DUO overload issues

Neil Smith G4DBN
 

I can't find any really strong signals at the moment, but 20 minutes ago I could get some squeaks out of the DUO which did not appear in SW2, They were less than 3kHz, but corresponded with two or more of the big signals a few kHz HF transmitting at the same instant. I think I'd need two very pure signal generators to isolate the effect. It didn't seem to happen with all signals, but if it was their carrier phase noise, I'd expect it to be less of a clear note. I tried with AGC off and various gains, and AGC on with various thresholds, made sure AN, NR and NB were disabled.

Need some louder signals. I'm a bit tied up making antenna feeds and things for 122 GHz, but if someone has a couple of signal generators or a crystal osc and tunable generator with low phase noise, it should be easy to characterise this and work out what the relationship is between tuning frequency and the frequencies of two loud signal sources to produce spurious signals.  If you ar in CW REV, the spacing of the strong and weak signals relative to the tune frequency are swapped, same as USB/LSB. I suspect the strong signal has to be in a particular relationship with the tuning freequency to have maximum audible effect.

Anyone out there able to generate a couple of S9+50 sigs a couple of kHz apart and tune around them to see if there are unexplained audible products within a few kHz in various modes? Any difference if one or both of them are pulsed?  This would be SO easy if my E4421B wasn't sick....

Neil G4DBN

On 29/05/2020 22:31, Steve Knell wrote:
I've taken a look at several strong signals this evening and the high-pitched CW filter artifacts are quite easy to locate.  I actually have 2 x FDM-DUOs each manufactured a few years apart.  I hooked up my spare DUO this evening and they both have the exactly same filter leakage on CW.  For some reason it's not so quite so bad when 'CW REV' is set to 'Y'.  NOTE: This is in standalone mode - I don't use the SW2 software.

AGC SLOW
AGC TH 1
NR OFF

PITCH 440 Hz
FIL 300 Hz

12 CW REV N
1 RX ATT ON

So OP5T is on 7019 and he's S9+20 - that's the kind of level you need to see this issue - at this level it's easy to identify the call sign associated with the high-pitch squawk (and find the true frequency).

Tune to 2.5kHz above the actual signal and the filter leakage is clearly audible, so 7021.5.  That's with no ADC overload (PK light is fully off).

It's even more noticeable on S9+30 and S9+40 signals and there will be loads of those this weekend during WPX CW!!  I think 'clicky' CW signals make it worse also.


Re: FDM-DUO overload issues

Steve Knell
 

I've taken a look at several strong signals this evening and the high-pitched CW filter artifacts are quite easy to locate.  I actually have 2 x FDM-DUOs each manufactured a few years apart.  I hooked up my spare DUO this evening and they both have the exactly same filter leakage on CW.  For some reason it's not so quite so bad when 'CW REV' is set to 'Y'.  NOTE: This is in standalone mode - I don't use the SW2 software.

AGC SLOW
AGC TH 1
NR OFF

PITCH 440 Hz
FIL 300 Hz

12 CW REV N
1 RX ATT ON

So OP5T is on 7019 and he's S9+20 - that's the kind of level you need to see this issue - at this level it's easy to identify the call sign associated with the high-pitch squawk (and find the true frequency).

Tune to 2.5kHz above the actual signal and the filter leakage is clearly audible, so 7021.5.  That's with no ADC overload (PK light is fully off).

It's even more noticeable on S9+30 and S9+40 signals and there will be loads of those this weekend during WPX CW!!  I think 'clicky' CW signals make it worse also.


Re: FDM-DUO overload issues

Steve Knell
 

Thanks Vianney - I'm quite interested in that QSF-06 unit.  Every time I get my antenna a bit higher the more "PK" I get :)


Re: FDM-DUO overload issues

Vianney Colombat
 

 
The QSF-06 configuration is stored in the FDM-DUO.
 
The CAT command for the QSF-06 is the same that the one for the SPF-08, i.e. "SF".
 
Vianney
 
 
From: "Steve Knell" <c6tradingltd@...>
To: EladSDR@groups.io
Date: Wed, 27 May 2020 11:33:36 -0700
Subject: Re: [EladSDR] FDM-DUO overload issues

I only use standalone because I'm Linux only in the shack.  I send CAT commands to the FDM-DUO though, so I wonder if that QSF configuration is stored in the FDM-DUO or the QSF unit or on the PC...

If Elad publish the CAT commands required to program the QSF unit I could give it a go, but I'm not 100% sure that bandpass filters will solve the issue...

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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: USB Cables to P.C, #fdm-sw2 #fdm-duo

Vianney Colombat
 

 
Hello,
 
 
Vianney
 
 
From: "David KK7SS" <d3j452@...>
To: EladSDR@groups.io
Date: Wed, 27 May 2020 16:26:47 -0700
Subject: [EladSDR] USB Cables to P.C, #fdm-sw2 #fdm-duo
 
[Edited Message Follows]
I'm about to try connecting the FDM-DUO to my PC.
I notice that one of the type-D cables is Blue and the other is Black.
:The Black one is plain.
T
he Blue one looks like it is shielded and has a RFI{?} trap on it!
Does it matter which goes where ?
Thanks

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.


FM DUO FOR SALE

Stephen Dible <w8crh@...>
 

For Sale: Elad FDM DUO.  Particulars are under my call (W8CRH)  at www.qth.com
Asking $900.00
VY73'
Steve W8CRH


Re: FDM-DUO overload issues

Neil Smith G4DBN
 

Aha! I forgot that I have TWO DUOs, so I don't need a sig genny to make a nice strong carrier, do I....
Neil


Re: FDM-DUO overload issues

Clint Chron
 

Hi Steve,

 

I saw some artifacts in the audio spectrum display of the SW2 software, but I am not sure that if they are causing a problem.  I could not hear anything.  I also found that the artifacts are there when in the SSB mode at 2.4 Khz bandwidth.  I guess that the best test would be for me to insert a straight key in the signal generator output line to generate CW signals and see if I can hear key clicks.

 

I listened with headphones on the audio out jack of my Duo and could not hear any audio artifacts.

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Steve Knell
Sent: Friday, May 29, 2020 5:47 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] FDM-DUO overload issues

 

Hi Neil - 'Spectrum Lab' - is that part of SW2 or is it this:  https://www.qsl.net/dl4yhf/spectra1.html  ?
Hi Clint - It looks like you were able to reproduce these artefacts, on CW mode, with a stable test signal - is that correct?

I would really like to find a fix for this.  It could save me a lot of money if I persevere with the Elad and don't end up buying a new radio..!


Re: FDM-DUO overload issues

Neil Smith G4DBN
 

The DL4YHF version.  Sadly, my HP signal generator has a blown output stage, so I can't do any really meaningful tests sorry.  If I can find a crystal osc I'll give it a try, but everything I have it on 10MHz or 100MHz and I have three 42U racks full of things with 10MHz refs, so not at all ideal for testing anything.

Neil

On 29/05/2020 13:47, Steve Knell wrote:
Hi Neil - 'Spectrum Lab' - is that part of SW2 or is it this: https://www.qsl.net/dl4yhf/spectra1.html ?
Hi Clint - It looks like you were able to reproduce these artefacts, on CW mode, with a stable test signal - is that correct?

I would really like to find a fix for this.  It could save me a lot of money if I persevere with the Elad and don't end up buying a new radio..!


Re: Band Plans #fdm-duo #eladduo

Hose
 

Got it... Thanks


Re: FDM-DUO overload issues

Steve Knell
 

Hi Neil - 'Spectrum Lab' - is that part of SW2 or is it this:  https://www.qsl.net/dl4yhf/spectra1.html  ?
Hi Clint - It looks like you were able to reproduce these artefacts, on CW mode, with a stable test signal - is that correct?

I would really like to find a fix for this.  It could save me a lot of money if I persevere with the Elad and don't end up buying a new radio..!


Interfacing with StationList

Otso Ylönen
 

Hello,
 
Have there been attempts to make SW2 and the excellent StationList to work together? StationList is a Windows application that shows a list of stations found on the frequency currently selected (databases such as FMLIST and MWLIST are the source of data). It can even "identify" an FM station if RDS PI code is available.
 
I am unaware if there is any API level availability of RDS data from SW2. Making this part of the remote control interface would be a welcome addition to FM DXers!
 
BR, Otso


Re: Band Plans #fdm-duo #eladduo

Paul Jones
 

You can download a new bandplan from our download site at eladit.com


Select you country and download




On May 28, 2020, at 23:25, Hose via groups.io <the1hose@...> wrote:

Hey folks,
I finally purchased an FDM-Duo from Ebay (fingers crossed) which should arrive in a few days. It is coming from the EU (Germany) and I'm wondering if there's any TX restrictions on frequencies based on EU/US band plans that may require firmware updates.


Band Plans #fdm-duo #eladduo

Hose
 

Hey folks,
I finally purchased an FDM-Duo from Ebay (fingers crossed) which should arrive in a few days. It is coming from the EU (Germany) and I'm wondering if there's any TX restrictions on frequencies based on EU/US band plans that may require firmware updates.


Re: #eladsw2 #eladsw2

mike bayard
 

Good add 


On Thu, May 28, 2020 at 6:05 PM, phoekzema Hoekzema
<phoekzema@...> wrote:

You also have to disable the (lock to CF) button.  Then to transmit on the correct frequency right click and  the RX #.  Doing CW you will have a latency problem.  Ear phones on the hardware receiver monitors the TX audio, Ear phones on the computer will give you the RX audio. 

 

Local Oscillator Frequency determines the span center.  

 

Best of experimenting.

 

Peter. WA7MOX

 

Sent from Mail for Windows 10

 

From: mike bayard via groups.io
Sent: Thursday, May 28, 2020 4:56 PM
To: EladSDR@groups.io
Subject: Re: [EladSDR] #eladsw2

 


If your trying to  move the main receiver you need to un check mode of fdm duo =mode of rx one 

 

 

On Thu, May 28, 2020 at 3:52 PM, AChristianHam@... via groups.io

<AChristianHam@...> wrote:

Hi,
I have an Elad FDM-DUO.  In FDM-SW2 is there any way to move the Slice and not the whole backround?
Mike N4BQQ

 


Re: #eladsw2 #eladsw2

phoekzema Hoekzema
 

You also have to disable the (lock to CF) button.  Then to transmit on the correct frequency right click and  the RX #.  Doing CW you will have a latency problem.  Ear phones on the hardware receiver monitors the TX audio, Ear phones on the computer will give you the RX audio. 

 

Local Oscillator Frequency determines the span center.  

 

Best of experimenting.

 

Peter. WA7MOX

 

Sent from Mail for Windows 10

 

From: mike bayard via groups.io
Sent: Thursday, May 28, 2020 4:56 PM
To: EladSDR@groups.io
Subject: Re: [EladSDR] #eladsw2

 


If your trying to  move the main receiver you need to un check mode of fdm duo =mode of rx one 

 

 

On Thu, May 28, 2020 at 3:52 PM, AChristianHam@... via groups.io

<AChristianHam@...> wrote:

Hi,
I have an Elad FDM-DUO.  In FDM-SW2 is there any way to move the Slice and not the whole backround?
Mike N4BQQ

 


Re: #eladsw2 #eladsw2

mike bayard
 



If your trying to  move the main receiver you need to un check mode of fdm duo =mode of rx one 



On Thu, May 28, 2020 at 3:52 PM, AChristianHam@... via groups.io
<AChristianHam@...> wrote:
Hi,
I have an Elad FDM-DUO.  In FDM-SW2 is there any way to move the Slice and not the whole backround?
Mike N4BQQ


Re: #eladsw2 #eladsw2

Wesley Knox
 

Oh , I follow. The only approximation I’ve found is to open up the IF window, click the tune button and click and drag the spectrum left/right (or I use mouse scroll wheel to tune frequency also). The IF window’s spectrum latency/delay is somewhat annoying though. Probably not quite what your other software provides.

Wes


From: EladSDR@groups.io <EladSDR@groups.io> on behalf of Wesley Knox <thewesknox@...>
Sent: Thursday, May 28, 2020 2:40:11 PM
To: EladSDR@groups.io <EladSDR@groups.io>
Subject: Re: [EladSDR] #eladsw2
 
I don’t believe any of the receiver slices are independent windows or sub-windows. Also, the SW2 behaves almost like a windows modal window. A “normal” non-modal window toggles from the taskbar when you click it’s tray icon but the SW2 will not. You have to click the underscore in the upper right corner of the window to minimize it. Double clicking the window frame doesn’t do it either. A little annoying when I’m running FT8 sessions and trying to swap views.

Wes


From: EladSDR@groups.io <EladSDR@groups.io> on behalf of mike bayard via groups.io <n8obu@...>
Sent: Thursday, May 28, 2020 2:30:53 PM
To: EladSDR@groups.io <EladSDR@groups.io>
Subject: Re: [EladSDR] #eladsw2
 
Unlock it your referring to a reciever as a slice 


On Thu, May 28, 2020 at 3:52 PM, AChristianHam@... via groups.io
<AChristianHam@...> wrote:
Hi,
I have an Elad FDM-DUO.  In FDM-SW2 is there any way to move the Slice and not the whole backround?
Mike N4BQQ


Re: #eladsw2 #eladsw2

Wesley Knox
 

I don’t believe any of the receiver slices are independent windows or sub-windows. Also, the SW2 behaves almost like a windows modal window. A “normal” non-modal window toggles from the taskbar when you click it’s tray icon but the SW2 will not. You have to click the underscore in the upper right corner of the window to minimize it. Double clicking the window frame doesn’t do it either. A little annoying when I’m running FT8 sessions and trying to swap views.

Wes


From: EladSDR@groups.io <EladSDR@groups.io> on behalf of mike bayard via groups.io <n8obu@...>
Sent: Thursday, May 28, 2020 2:30:53 PM
To: EladSDR@groups.io <EladSDR@groups.io>
Subject: Re: [EladSDR] #eladsw2
 
Unlock it your referring to a reciever as a slice 


On Thu, May 28, 2020 at 3:52 PM, AChristianHam@... via groups.io
<AChristianHam@...> wrote:
Hi,
I have an Elad FDM-DUO.  In FDM-SW2 is there any way to move the Slice and not the whole backround?
Mike N4BQQ

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