Date   
Re: FDM-DUO OS X

Guillermo
 

Thank you Giovanni. 

Since nothing else was amiss and your email confirmed it, I then suspected a physical anomaly.

Took appart the DB9 connector housing.  Resoldered the wires and voilá, BLUDUO is now working.  Must have been a loose connection.

73 de Guillermo, HK4KM

CAN DUO ART 120 POWER-OUT BE ADJUSTED?

m7mcqio83ro@...
 

My DUO ART should arrive tomorrow. Is the output ALWAYS high or can the power output be lowered??

TIA 

Tom - M7MCQ

Re: T/R Automatic Antenna Switch Looking for Recommendation

m7mcqio83ro@...
 

Hi All, just to point out that I have direct experience of the MFJ 1708B and it works fine!! In fact, I'd say it's one of MFJ's 'better made' products. You can read about my use of it HERE.

Re: FDM-DUO OS X

Giovanni Franza
 

Hi Guillermo,

the versions matches, so it is not problem with versions.

So, powering the DUO, activating bluetooth on phone, verified that the adapter is paired and
starting Blueduo should work (the order of operations matter).

Installing on the phone/tablet an app (free) as "Serial Bluetooth Terminal" and
opening the ELAD device shows a flow of data from the DUO ?

Unpairing and re-pairing the bluetooth adapter before starting BlueDUO helps?

Sorry to ask this, but it is not simple to debug from remote :-(

Hope this helps,

Giovanni - HB9EIK

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

m7mcqio83ro@...
 

Hi Klaus, I have no HAM/CB operators nearby.
As for my shack's  240V, it all runs through one socket which goes through this home-made FILTER.

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Klaus Brosche, DK3QN
 

Tom,

What also came to my mind:

do you have any sort of non-HAM or HAM transmitter close to your location?

Opposite to your other transceivers, a 'standard' DUO has a wide-open frontend in order
to allow for quite wideband-spread multiple frequency receiving channels.

There is no dedicated per HAM band specific preselection filtering inside the DUO.

Klaus, DK3QN
Friedberg, Bavaria


Am 05.11.2019 um 21:11 schrieb Klaus Brosche, DK3QN:

Tom,

It makes no difference drawing the DUO power from the ART-120, as long as the power supply
to the ART-120 is the same as before (same power source, the DC power feed-through to your
DUO will certainly *not* make your 12 or 13 volts DC power source looking more 'beautiful').

Klaus, DK3QN


Am 05.11.2019 um 20:19 schrieb m7mcqio83ro@...:
Okay, so I'm home and have tried the suggestions. Here's the answer to your comprehensive help Neil...

What level in dBm does the display show with no antenna connected and with it connected?
-120dBm

Any sign of the PK indicator showing? If so, does enabling the RX ATT menu 1 make any difference?
NO PK INDICATOR

If the PK indicator is NOT showing, then try these:

Does the noise level change if you connect the antenna, or is it bad even with nothing connected? 
NOISIER WITH ANTENNA CONNECTED

Does it change level if you select antenna 1 or two on menu 31?
THE UNOCCUPIED ANTENNA SOCKET IS QUIET

Is anything else connected at all? (keyer, PTT out, ref in, USB etc?)
NOTHING ELSE CONNECTED. STANDALONE MODE

What settings do you see on the E1 control?  Mine has SQL OFF, AGC ON, AGC FAST, AGC TH 3, NR OFF, NB OFF, AN OFF
SAME EXCEPT AGC TH WAS 0.

How about E2? I have RIT OFF, FIL 2700, PITCH 600
SAME

I am in USB mode.
NOT CONNECTED TO PC YET

===========================================

So the AGC Threshold was at zero which produced more noise. The radio sounds much better - thanks Neil!!

It's still not as quiet as my other radios and has definitely got a higher noise floor than similar SDR radios I've had (FLEX3000 & ELECRAFT KX3). I'll keep on experimenting and see how I can improve things over the weekend.

Tomorrow, my DUO ART 120 with ATU arrives, so maybe the FDM will benefit from drawing its power from the amp? Having said that, I've had zero problems with noise before from my PSU's.

I'll keep you all posted and once again, THANK YOU!!

Tom M7MCQ



Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Klaus Brosche, DK3QN
 

Tom,

It makes no difference drawing the DUO power from the ART-120, as long as the power supply
to the ART-120 is the same as before (same power source, the DC power feed-through to your
DUO will certainly *not* make your 12 or 13 volts DC power source looking more 'beautiful').

Klaus, DK3QN


Am 05.11.2019 um 20:19 schrieb m7mcqio83ro@...:

Okay, so I'm home and have tried the suggestions. Here's the answer to your comprehensive help Neil...

What level in dBm does the display show with no antenna connected and with it connected?
-120dBm

Any sign of the PK indicator showing? If so, does enabling the RX ATT menu 1 make any difference?
NO PK INDICATOR

If the PK indicator is NOT showing, then try these:

Does the noise level change if you connect the antenna, or is it bad even with nothing connected? 
NOISIER WITH ANTENNA CONNECTED

Does it change level if you select antenna 1 or two on menu 31?
THE UNOCCUPIED ANTENNA SOCKET IS QUIET

Is anything else connected at all? (keyer, PTT out, ref in, USB etc?)
NOTHING ELSE CONNECTED. STANDALONE MODE

What settings do you see on the E1 control?  Mine has SQL OFF, AGC ON, AGC FAST, AGC TH 3, NR OFF, NB OFF, AN OFF
SAME EXCEPT AGC TH WAS 0.

How about E2? I have RIT OFF, FIL 2700, PITCH 600
SAME

I am in USB mode.
NOT CONNECTED TO PC YET

===========================================

So the AGC Threshold was at zero which produced more noise. The radio sounds much better - thanks Neil!!

It's still not as quiet as my other radios and has definitely got a higher noise floor than similar SDR radios I've had (FLEX3000 & ELECRAFT KX3). I'll keep on experimenting and see how I can improve things over the weekend.

Tomorrow, my DUO ART 120 with ATU arrives, so maybe the FDM will benefit from drawing its power from the amp? Having said that, I've had zero problems with noise before from my PSU's.

I'll keep you all posted and once again, THANK YOU!!

Tom M7MCQ


Re: FDM-DUO OS X

Guillermo
 

Hello Giovanni.

FW versions on my DUO are:

UI  0.487
FGA 02.00
USB 04.09
RX 01.50
TX 01.35

I installed the latest 2019-01-04 apk and got no response from the radio.  No waterfall, no feedback on mode, frequency, etc.

Guillermo

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

m7mcqio83ro@...
 

Okay, so I'm home and have tried the suggestions. Here's the answer to your comprehensive help Neil...

What level in dBm does the display show with no antenna connected and with it connected?
-120dBm

Any sign of the PK indicator showing? If so, does enabling the RX ATT menu 1 make any difference?
NO PK INDICATOR

If the PK indicator is NOT showing, then try these:

Does the noise level change if you connect the antenna, or is it bad even with nothing connected? 
NOISIER WITH ANTENNA CONNECTED

Does it change level if you select antenna 1 or two on menu 31?
THE UNOCCUPIED ANTENNA SOCKET IS QUIET

Is anything else connected at all? (keyer, PTT out, ref in, USB etc?)
NOTHING ELSE CONNECTED. STANDALONE MODE

What settings do you see on the E1 control?  Mine has SQL OFF, AGC ON, AGC FAST, AGC TH 3, NR OFF, NB OFF, AN OFF
SAME EXCEPT AGC TH WAS 0.

How about E2? I have RIT OFF, FIL 2700, PITCH 600
SAME

I am in USB mode.
NOT CONNECTED TO PC YET

===========================================

So the AGC Threshold was at zero which produced more noise. The radio sounds much better - thanks Neil!!

It's still not as quiet as my other radios and has definitely got a higher noise floor than similar SDR radios I've had (FLEX3000 & ELECRAFT KX3). I'll keep on experimenting and see how I can improve things over the weekend.

Tomorrow, my DUO ART 120 with ATU arrives, so maybe the FDM will benefit from drawing its power from the amp? Having said that, I've had zero problems with noise before from my PSU's.

I'll keep you all posted and once again, THANK YOU!!

Tom M7MCQ

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

David
 

Don’t think I can help as traded in my ICOM 7300 to get an ELAD DUO-ART 120, because I found FDM-DUO’s Rx was much quieter than the 7300’s!

As before, running with no RF ground - my current antennae are five inverted Vees resonant on 40 (and 6), 20, 17, 15 and 10. FDM-DUO is powered from DUO-ART, with DUO-ART and laptop fed from same power socket (via large clip-on ferrite filter- clipped around several turns of mains lead).  Clip-on ferrites on laptop's PSU.  7300  was powered via same filter.

USB leads for FDM-DUO are now as short as possible (50cm), with clip-on ferrites both ends.

Slightly off the thread, an unforeseen plus of the DUO-ART is that its internal ATU tunes my five inverted Vees (all fed unswitched from the same length of coax via a home-made 1:1  current balun) for 60 and 12 metres.  The 7300’s ATU  would not handle that level of mis-match.

David   G8IIC



On 5 Nov 2019, at 15:15, Craig Williams KA6RWL <ka6rwl@...> wrote:

Have you tried your LiPo battery in the shack to rule out noise from your power supply?

I will ditto that of my radios the Duo is very quiet.

Craig
KA6RWL 

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Craig Williams KA6RWL
 

Have you tried your LiPo battery in the shack to rule out noise from your power supply?

I will ditto that of my radios the Duo is very quiet.

Craig
KA6RWL 

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

m7mcqio83ro@...
 

Thanks for the replies so far - it's very much appreciated! I will try out some of the suggestions when I get home from work. The FDM DUO was purchased for use in the shack where a Yaesu FT-DX3000 and an Icom IC-7400 perform flawlessly - on the same antenna!

The shack has a fantastic earth system which is just 3 feet away from the rigs. The radio sounds like a noisy old AM transistor set from the sixties, LOL. It's definitely picking up every last bit of noise in the room/area, where the other radios are lovely and quiet.  Again, inside the car (fed from a LifePO battery) the DUO is terribly noisy whereas the other radios are just not affected.

Very odd!! Anyway, I'll try out your suggestions and get back to you tonight. 

THANKS AGAIN for your support.

Tom - M7MCQ

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Clint Chron
 

You might want to check your AGC thresh-hold setting.  If it is all way to the right, the radio will be very noisy.  All the way to the left and the radio will be extremely quite.

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of groups@...
Sent: Tuesday, November 5, 2019 6:51 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] FDM DUO INCREDIBLY NOISY!!! #fdm-duo

 

[Edited Message Follows]

Hello everybody.
Of all my devices: KX-3, Xiegu G90, ALT-512 and FT-891, the ELAD FDM-DUO has the quietest receiver.
With that I can hear the whole evening on my monitor speakers on the shortwave, without it annoying.

Best regards Ralf

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Neil Smith G4DBN
 

No they are not like that Tom. I use mine for extreme weak signal work on VHF/UHF/SHF and on LF and it is one of the best performers I have ever used.

Hard to say what is wrong though. The DUO is extremely sensitive compared with many analogue radios, but with the AGC set correctly, it should behave itself unless you are overloading it.

What level in dBm does the display show with no antenna connected and with it connected?

Any sign of the PK indicator showing? If so, does enabling the RX ATT menu 1 make any difference?

If you are not using narrowband antennas, you need to make sure you are not overloading the wideband front end with broadcast signals or anything. If the PK indicator is showing, then you have strong out of band signals that are delivering more than the approx -10dBm total signal that the ADC can handle.  This applies to any SDR of course.

If you are seeing PK overloads, then you need to think about how to reduce the level of the interfering signal.

If the PK indicator is NOT showing, then try these:

Does the noise level change if you connect the antenna, or is it bad even with nothing connected? 

Does it change level if youselect antenna 1 or two on menu 31?

Is anything else connected at all? (keyer, PTT out, ref in, USB etc?)

What settings do you see on tthe E1 control?  Mine has SQL OFF, AGC ON, AGC FAST, AGC TH 3, NR OFF, NB OFF, AN OFF

How about E2? I have RIT OFF, FIL 2700, PITCH 600

I am in USB mode.

See what happens if you adjust the AGC THreshold.

Let us know what you find.

Neil G4DBN


On 05/11/2019 13:26, m7mcqio83ro@... wrote:
Hi all, I just bought a used FDM DUO and when I plugged it in last night at home, it was incredibly noisy!! I thought there was something wrong with my G5RV or with the existing settings in the transceiver, so I performed a DEFAULT RESET and it was just the same.

So a few minutes ago during my work-break I drove up to a high vantage point and connected it up to a LifePO battery. It was nice and quiet.

As soon as I sat back in the car though, it was back to being incredibly noisy with the ignition switched on (but engine not running).  I've had lots of radios and NONE have been noisy like this one. It's soooo poor! 

Are they all like this or have I bought a duffer??

73, Tom. M7MCQ

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

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

groups@...
 
Edited

Hello everybody.
Of all my devices: KX-3, Xiegu G90, ALT-512 and FT-891, the ELAD FDM-DUO has the quietest receiver.
With that I can hear the whole evening on my monitor speakers on the shortwave, without it annoying.

Best regards Ralf

Re: FDM DUO INCREDIBLY NOISY!!! #fdm-duo

Klaus Brosche, DK3QN
 

Hello Tom,

Mine is *not* noisy at all.

When yours was nice and quiet on the LiFePo: did you connect any antenna at that point?

In the car: did you feed it there from the LiFePo or from the car battery? Any antenna
connected?

Klaus, DK3QN

Am 05.11.2019 um 14:26 schrieb m7mcqio83ro@...:

Hi all, I just bought a used FDM DUO and when I plugged it in last night at home, it was incredibly noisy!! I thought there was something wrong with my G5RV or with the existing settings in the transceiver, so I performed a DEFAULT RESET and it was just the same.

So a few minutes ago during my work-break I drove up to a high vantage point and connected it up to a LifePO battery. It was nice and quiet.

As soon as I sat back in the car though, it was back to being incredibly noisy with the ignition switched on (but engine not running).  I've had lots of radios and NONE have been noisy like this one. It's soooo poor! 

Are they all like this or have I bought a duffer??

73, Tom. M7MCQ


FDM DUO INCREDIBLY NOISY!!! #fdm-duo

m7mcqio83ro@...
 

Hi all, I just bought a used FDM DUO and when I plugged it in last night at home, it was incredibly noisy!! I thought there was something wrong with my G5RV or with the existing settings in the transceiver, so I performed a DEFAULT RESET and it was just the same.

So a few minutes ago during my work-break I drove up to a high vantage point and connected it up to a LifePO battery. It was nice and quiet.

As soon as I sat back in the car though, it was back to being incredibly noisy with the ignition switched on (but engine not running).  I've had lots of radios and NONE have been noisy like this one. It's soooo poor! 

Are they all like this or have I bought a duffer??

73, Tom. M7MCQ

Re: New Noise Reduction Features in SP1A External Speaker

Clint Chron
 

What DSP chip does it use?

 

73

Clint

W7KEC

 

From: EladSDR@groups.io [mailto:EladSDR@groups.io] On Behalf Of Vianney Colombat
Sent: Tuesday, November 5, 2019 4:19 AM
To: EladSDR@groups.io
Subject: Re: [EladSDR] New Noise Reduction Features in SP1A External Speaker

 


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

Klaus Brosche, 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.