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  1. X5105-Users
  2. Topics

AM TRANSMIT DISTORTION

 

Has anyone operated their x5105 on AM? Receive is fine, but Transmit is horribly distorted… please let me know.

Tnx

Howie wa3mck

_._,_._,_

--
"Quis custodiet ipsos custodes?"
 

Well, I have not tried AM, but the 'logical' reason would be overmodulation.

Check the manual (and adjust modulation level)-

System parameter configuration
?
Personalized settings can be achieved for transceiver in system settings menu to make it fit your using habit in a
better way.
Operation methods:
1. Press and hold [MENU] key for 1s to enter system settings menu;
2. Press [<] and [>] multi-function keys at the bottom of screen to call out the menu items you want to adjust;
3. Rotate major knob to set parameters you wanted;
4. Press [SAVE] key in a short time to save current settings and exit menu mode after setting.
?? If pressing [QUIT] key in a short key in step 4 mentioned above, new settings will not be saved and the
equipment will exit menu mode of the system.
?
?
Descriptions of system menu
?
Menu items? Function description? Settable values? Default
#1? LCD? Backlight? Displayer backlight brightness
OFF～LEVEL5? LEVEL5
#2? LCD Contrast? Displayer contrast ratio
0～30? 30
#3? BEEP Volum? System prompt volume
0～100? 50
#4? CW? Tone? Volum? CW sidetone volume? 0～100? 50
#5? Key BEEP? Key prompt tone? OFF/ON? ON

#6? AM Mod Level? AM transmission modulation degree? 0～63? 60

--
Doug, K8RFT
Dale Parfitt
 

开云体育

I have tried all of the settings for TX AM, and nothing makes it better. One would think that the AM mod and demod would all be done in SDR code. Simply multiplying Cos(Wm)t by Cos (Wc)t? yields perfect AM. Who knows how Xiegu chose to? do it though.

?

Dale W4OP

?

From: [email protected] [mailto:[email protected]] On Behalf Of DougVL
Sent: Tuesday, October 26, 2021 11:27 AM
To: [email protected]
Subject: Re: [X5105-Users] AM TRANSMIT DISTORTION

?

Well, I have not tried AM, but the 'logical' reason would be overmodulation

Check the manual (and adjust modulation level)-

System parameter configuration
?
Personalized settings can be achieved for transceiver in system settings menu to make it fit your using habit in a
better way.
Operation methods:
1. Press and hold [MENU] key for 1s to enter system settings menu;
2. Press [<] and [>] multi-function keys at the bottom of screen to call out the menu items you want to adjust;
3. Rotate major knob to set parameters you wanted;
4. Press [SAVE] key in a short time to save current settings and exit menu mode after setting.
u? If pressing [QUIT] key in a short key in step 4 mentioned above, new settings will not be saved and the
equipment will exit menu mode of the system.
?
?
Descriptions of system menu
?
Menu items? Function description? Settable values? Default
#1? LCD? Backlight? Displayer backlight brightness
OFF～LEVEL5? LEVEL5
#2? LCD Contrast? Displayer contrast ratio
0～30? 30
#3? BEEP Volum? System prompt volume
0～100? 50
#4? CW? Tone? Volum? CW sidetone volume? 0～100? 50
#5? Key BEEP? Key prompt tone? OFF/ON? ON

#6? AM Mod Level? AM transmission modulation degree? 0～63? 60

--
Doug, K8RFT

 

Hi Dale,

I just conducted a test transmitting with my X5105 on 10 meter AM and found it was really distorted at the the default AM modulation level of 60, but when turned down to 45 it sounded quite clear on the internal Mic and just slightly distorted on the supplied hand Mic. My Mic gain is set at 25 for external Mic and 30 for the internal Mic. A interesting note, with modulation set at 45 I get 5 watts carrier and with added modulation the power output drops to the 4 watt range, this is the same with both Mics. Odd that.

Joel
N6ALT
 

Dale,

I think Xiegu needs to bless us with another firmware upgrade for the X5105, but my experience with them is that when they get a radio almost free of bugs they quit releasing updates. Never finished.

Joel
N6ALT

Joel
Dale Parfitt
 

开云体育

Downward modulation is not unusual for solid state? rigs on AM. I inspected the AM envelope on my spectrum analyzer with 2 tone, and it is a mess at any setting I could come up with. A trapezoid pattern? likely would not look good either, but? have not taken the time for that.\\Dale W4OP

?

From: [email protected] [mailto:[email protected]] On Behalf Of Joel Caulkins/N6ALT
Sent: Tuesday, October 26, 2021 12:19 PM
To: [email protected]
Subject: Re: [X5105-Users] AM TRANSMIT DISTORTION

?

Hi Dale,

I just conducted a test transmitting with my X5105 on 10 meter AM and found it was really distorted at the the default AM modulation level of 60, but when turned down to 45 it sounded quite clear on the internal Mic and just slightly distorted on the supplied hand Mic. My Mic gain is set at 25 for external Mic and 30 for the internal Mic. A interesting note, with modulation set at 45 I get 5 watts carrier and with added modulation the power output drops to the 4 watt range, this is the same with both Mics. Odd that.

Joel
N6ALT

 

Hi Doug,

Thank you… I’ve tried that and no success.

Tried modulation at 60 61 62 and 63 - did not improve distortion. I can see it on my spectrum analyzer and hear it on my monitor receiver - signal is unintelligible!

Frustrating… Dale Parfitt W4OP?

On Tue, Oct 26, 2021 at 11:27 DougVL <K8RFTradio@...> wrote:
Well, I have not tried AM, but the 'logical' reason would be overmodulation.

Check the manual (and adjust modulation level)-

System parameter configuration
?
Personalized settings can be achieved for transceiver in system settings menu to make it fit your using habit in a
better way.
Operation methods:
1. Press and hold [MENU] key for 1s to enter system settings menu;
2. Press [<] and [>] multi-function keys at the bottom of screen to call out the menu items you want to adjust;
3. Rotate major knob to set parameters you wanted;
4. Press [SAVE] key in a short time to save current settings and exit menu mode after setting.
?? If pressing [QUIT] key in a short key in step 4 mentioned above, new settings will not be saved and the
equipment will exit menu mode of the system.
?
?
Descriptions of system menu
?
Menu items? Function description? Settable values? Default
#1? LCD? Backlight? Displayer backlight brightness
OFF～LEVEL5? LEVEL5
#2? LCD Contrast? Displayer contrast ratio
0～30? 30
#3? BEEP Volum? System prompt volume
0～100? 50
#4? CW? Tone? Volum? CW sidetone volume? 0～100? 50
#5? Key BEEP? Key prompt tone? OFF/ON? ON

#6? AM Mod Level? AM transmission modulation degree? 0～63? 60

--
Doug, K8RFT

--
"Quis custodiet ipsos custodes?"
 



On Tue, Oct 26, 2021 at 11:33 Submarine Radioman <wa3mck@...> wrote:
Hi Doug,

Thank you… I’ve tried that and no success.

Tried modulation at 60 61 62 and 63 - did not improve distortion. I can see it on my spectrum analyzer and hear it on my monitor receiver - signal is unintelligible!

Frustrating… ?

On Tue, Oct 26, 2021 at 11:27 DougVL <K8RFTradio@...> wrote:
Well, I have not tried AM, but the 'logical' reason would be overmodulation.

Check the manual (and adjust modulation level)-

System parameter configuration
?
Personalized settings can be achieved for transceiver in system settings menu to make it fit your using habit in a
better way.
Operation methods:
1. Press and hold [MENU] key for 1s to enter system settings menu;
2. Press [<] and [>] multi-function keys at the bottom of screen to call out the menu items you want to adjust;
3. Rotate major knob to set parameters you wanted;
4. Press [SAVE] key in a short time to save current settings and exit menu mode after setting.
?? If pressing [QUIT] key in a short key in step 4 mentioned above, new settings will not be saved and the
equipment will exit menu mode of the system.
?
?
Descriptions of system menu
?
Menu items? Function description? Settable values? Default
#1? LCD? Backlight? Displayer backlight brightness
OFF～LEVEL5? LEVEL5
#2? LCD Contrast? Displayer contrast ratio
0～30? 30
#3? BEEP Volum? System prompt volume
0～100? 50
#4? CW? Tone? Volum? CW sidetone volume? 0～100? 50
#5? Key BEEP? Key prompt tone? OFF/ON? ON

#6? AM Mod Level? AM transmission modulation degree? 0～63? 60

--
Doug, K8RFT

--
"Quis custodiet ipsos custodes?"
--
"Quis custodiet ipsos custodes?"
 

On Tue, Oct 26, 2021 at 05:59 PM, Howie WA3MCK wrote:
Tried modulation at 60 61 62 and 63
Try setting it MUCH lower, as someone else has suggested above.? Increasing the setting would make it even worse!
Try setting at 25, as Joel did.
--
Doug, K8RFT
 

Oh, and please report back with your results.? Other members may also want to try AM.
--
Doug, K8RFT
 

Yep. Found the same thing: Choppy/distorted.?

Bearing mind that there's a deep menu AM setting and another mic level setting in the "upstairs" menu, I fiddled with both and was unable to come to a setting balance for either that improved AM modulation. FM was ok, SSB was fine but AM was, as reported, what could only be described as distorted.

But then since I use the radio mainly on CW, I figure I ain't got a real problem. (And since it ain't modifiable for 11m ;-) I figure no AM is no great loss.)

At which point I'm waiting to see what the price of the X6100's gonna be. (And noting all the promises of its having been beta tested &c ;-) )

Nils / W8IJN
 

I have not performed on-the-air (with another station) AM tests using the Xiegu X5015, but I have tested using the transceiver by listening to the audio on another radio (using headphones) while transmitting on AM.? I have found that the level of distortion is very dependent on the distance of the microphone from my mouth.? When using the stock microphone about 6-8 inches away from my mouth, the audio was acceptable on AM.? I suspect that the audio level is just too high from the microphone for the AM circuit.? I very rarely operate using AM, but this work-around could be of use if AM was required.?
--
- Stuart VE3SMF
Dale Parfitt
 

开云体育

I think that is the consensus Stuart. But at that distance from the mic? I? believe you will find your modulation? percentage is very low.

?

Dale W4OP

?

From: [email protected] [mailto:[email protected]] On Behalf Of VE3SMF via groups.io
Sent: Thursday, October 28, 2021 9:56 AM
To: [email protected]
Subject: Re: [X5105-Users] AM TRANSMIT DISTORTION

?

I have not performed on-the-air (with another station) AM tests using the Xiegu X5015, but I have tested using the transceiver by listening to the audio on another radio (using headphones) while transmitting on AM.? I have found that the level of distortion is very dependent on the distance of the microphone from my mouth.? When using the stock microphone about 6-8 inches away from my mouth, the audio was acceptable on AM.? I suspect that the audio level is just too high from the microphone for the AM circuit.? I very rarely operate using AM, but this work-around could be of use if AM was required.?
--
- Stuart VE3SMF

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