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MH-31 Microphone low output


Sid Boyce
 

Hi David,
It's something I'll bother him about later as we recently were chasing a problem on a PiHPSDR v2 connected to HermesLite2 which turned out to be a tick box for local microphone selection not showing up on that screen.
When I took a screen snapshot it was there - so it was just a problem with contrast.
Two Raspberry Pi official LCD's, one OK and the other with the problem.
73 ... Sid.

On 18/09/2020 14:49, David Fainitski wrote:
Hi, Sid
I can't believe it, even Quisk has this option. Did you try to reach g0orx ? This is the serious issue.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


David Fainitski
 

Hi, Sid
I can't believe it, even Quisk has this option. Did you try to reach g0orx ? This is the serious issue.


Sid Boyce
 

Hi David,
Not in pihpsdr.
Just the Local Microphone  and Compression.
I have not tried adjusting Compression to see if that would give a usefull boost.
73 ... Sid.

On 17/09/2020 14:28, David Fainitski wrote:
Sid, is there no 20db preamp option ?
Should be there.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


David Fainitski
 

Sid, is there no 20db preamp option ?
Should be there.


Sid Boyce
 

Thanks Reto,
As I am using the pihpsdr, I'll do the mod with the electret mic.
73 ... SId.

On 16/09/2020 21:29, Reto HB9TRT wrote:
Hi Sid,
also no problems here with the MH31. Good modulation and normal power output at the 1W PA from Ody-2.

vy 73
Reto
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


Sid Boyce
 

Thanks David,
That's absent from pihpsdr.
73 ... Sid.

On 16/09/2020 14:57, David Fainitski wrote:
Hello, Sid.
My MH-31 mic was tested with PowerSDR Wich has "mic 20db preamp" settings and also program mic amplification settings.
No any problems.
Dynamic microphones like MH-31 required 20db preamp option on, unlike electret microphones.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


Sid Boyce
 

Thanks Neoklis,
Looks great, I'll do that mod.
73 ... Sid.

On 16/09/2020 14:23, Neoklis Kyriazis via groups.io wrote:
Has anyone experienced low microphone level from the MH-31?
No, but I found this article that may confirm your problems.
https://www.iarc.org/~4x1mk/modifying_the_MH-31_Yaesu_microphone.html

--
Best Regards
Neoklis - Ham Radio Call:5B4AZ
http://www.5b4az.org/
https://www.qsl.net/5b4az/index.html

--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


Reto HB9TRT
 

Hi Sid, 
also no problems here with the MH31. Good modulation and normal power output at the 1W PA from Ody-2. 

vy 73
Reto


David Fainitski
 

Hello, Sid.
My MH-31 mic was tested with PowerSDR Wich has "mic 20db preamp" settings and also program mic amplification settings.
No any problems.
Dynamic microphones like MH-31 required 20db preamp option on, unlike electret microphones.


Neoklis Kyriazis
 

Has anyone experienced low microphone level from the MH-31?
No, but I found this article that may confirm your problems.
https://www.iarc.org/~4x1mk/modifying_the_MH-31_Yaesu_microphone.html

--
Best Regards
Neoklis - Ham Radio Call:5B4AZ
http://www.5b4az.org/
https://www.qsl.net/5b4az/index.html


Sid Boyce
 

Has anyone experienced low microphone level from the MH-31?

With the ODY-2's 1W I get no movement with the SWR meter set to 5W PEP full scale.

My setup ODYSSEY-2 --> 100W PA ex-IC737. At first I thought the problem was with the PA.

If I scream into the MH-31, I can talk it up beyond full output, speaking normally or blowing equivalently I get only a few watts output.

Using local audio electret mic to a USB audio dongle  with the PiHPSDR v2 I can drive the amp close to 200W PEP into a dummy load speaking at a normal voice .

73 ... Sid.

--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks