¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. FT-857
  2. Topics

No transmit audio from Koss headset when wired into RJ45 via front panel not sure what to do

 

The SB40 is a dynamic microphone so it doesn't need to be powered. I cut the plug off the microphone end and found a single insulated white wire and a bare copper wire.
?
I'm assuming these are signal and ground. I wired these up to a RJ45 cable for the FT857 using the mic signal and mic ground wires.?
?
When trying to transmit SSB I'm seeing no TX power and what I'm assuming is no input audio.?
?
One other odd thing is I don't see continuity between the wires and the plug on the end i snipped.
?
I'm at a loss any help is appreciated. RX audio is handled though the port on the side of the faceplate.
 

¿ªÔÆÌåÓý

Did you wire the Mic to pins 4&5 of the RJ45 Connector.

How are you providing ptt to the radio?? Are you using VOX mode and if so did you try adjusting Menu 88 vox gain?

Also do you have menu 59 (Mic Sel) set for normal?


Leonard K. Pennock
AD7AS

Those who walk bravely through life, unafraid of loss or failure,
find that they very rarely lose or fail.
On 4/19/25 11:55 AM, Michael KC1WDZ via groups.io wrote:

The SB40 is a dynamic microphone so it doesn't need to be powered. I cut the plug off the microphone end and found a single insulated white wire and a bare copper wire.
?
I'm assuming these are signal and ground. I wired these up to a RJ45 cable for the FT857 using the mic signal and mic ground wires.?
?
When trying to transmit SSB I'm seeing no TX power and what I'm assuming is no input audio.?
?
One other odd thing is I don't see continuity between the wires and the plug on the end i snipped.
?
I'm at a loss any help is appreciated. RX audio is handled though the port on the side of the faceplate.
 

Yes with the RJ45 plug I have the center conductor on the headset mic plug is to pin 4 blue/white and bare wire to pin 5 solid blue.?

PTT is wired into a foot switch, I have PTT control but power on SSB. Microphone is set to normal.

Michael Easter

Do not be too moral. You may cheat yourself out of much life. Aim above morality. Be not simply good; be good for something. -Thoreau

On Sat, Apr 19, 2025, 15:23 Leonard K. Pennock via <leonardpennock=[email protected]> wrote:

Did you wire the Mic to pins 4&5 of the RJ45 Connector.

How are you providing ptt to the radio?? Are you using VOX mode and if so did you try adjusting Menu 88 vox gain?

Also do you have menu 59 (Mic Sel) set for normal?


Leonard K. Pennock
AD7AS

Those who walk bravely through life, unafraid of loss or failure,
find that they very rarely lose or fail.
On 4/19/25 11:55 AM, Michael KC1WDZ via wrote:
The SB40 is a dynamic microphone so it doesn't need to be powered. I cut the plug off the microphone end and found a single insulated white wire and a bare copper wire.
?
I'm assuming these are signal and ground. I wired these up to a RJ45 cable for the FT857 using the mic signal and mic ground wires.?
?
When trying to transmit SSB I'm seeing no TX power and what I'm assuming is no input audio.?
?
One other odd thing is I don't see continuity between the wires and the plug on the end i snipped.
?
I'm at a loss any help is appreciated. RX audio is handled though the port on the side of the faceplate.
 

I have 2 of the yeasu mh-48 mics if you would like to borrow one to test. They are brand new in box waiting to replace 1 of mine when they inevitably go bad at some point.

Justin R Poole??
Networking and Bleep Bloop Speciologist - Technical Makeithappener/PC Fixrupr
(850)814-5945
Amateur Radio Callsign -?K4DPL
GMRS Callsign -?WSFN308
(Sent from my GOOGLE PIXEL 8 PRO)

???

On Sat, Apr 19, 2025, 15:40 Michael KC1WDZ via <measter=[email protected]> wrote:
Yes with the RJ45 plug I have the center conductor on the headset mic plug is to pin 4 blue/white and bare wire to pin 5 solid blue.?

PTT is wired into a foot switch, I have PTT control but power on SSB. Microphone is set to normal.

Michael Easter

Do not be too moral. You may cheat yourself out of much life. Aim above morality. Be not simply good; be good for something. -Thoreau

On Sat, Apr 19, 2025, 15:23 Leonard K. Pennock via <leonardpennock=[email protected]> wrote:

Did you wire the Mic to pins 4&5 of the RJ45 Connector.

How are you providing ptt to the radio?? Are you using VOX mode and if so did you try adjusting Menu 88 vox gain?

Also do you have menu 59 (Mic Sel) set for normal?


Leonard K. Pennock
AD7AS

Those who walk bravely through life, unafraid of loss or failure,
find that they very rarely lose or fail.
On 4/19/25 11:55 AM, Michael KC1WDZ via wrote:
The SB40 is a dynamic microphone so it doesn't need to be powered. I cut the plug off the microphone end and found a single insulated white wire and a bare copper wire.
?
I'm assuming these are signal and ground. I wired these up to a RJ45 cable for the FT857 using the mic signal and mic ground wires.?
?
When trying to transmit SSB I'm seeing no TX power and what I'm assuming is no input audio.?
?
One other odd thing is I don't see continuity between the wires and the plug on the end i snipped.
?
I'm at a loss any help is appreciated. RX audio is handled though the port on the side of the faceplate.

PXL_20250420_012637740.jpg

1 - 4 of 4