Good morning Champo! First .... "my point of view on the microphone issue". (others please chime in when you discover stupidity on my part!!!! I welcome it!!!!)
(by the way....at the VERY BOTTOM after typing all of this in..... it occurred to me that... you may ALREADY KNOW all this...... and that telling you anyway...MIGHT make you want to "beat the s##t" out of me for feeding it to you (that was SNOT of course!!!!! ). That said... I am leaving it here just in case. It could help someone else!)
ON the subject of the microphone..... the diagram you send...... appears to be attaching a 5 wire microphone to the Romar ACT-1914 radio.
I went out and found the Astatic Mic Wiring book and it tells me that nominal Astatic color code is:
White - Audio
Sh (shield) -Audio Shield
Blue - Switching common
Red - Transmit (when grounded)
Black - Receive (when grounded)
Yellow - Special Receive Ground (not normally used)
Now, from the Romar ACT-1914 wiring part, I see that the jack on the radio is:
1 - Audio
2 - Ground
3 - Receive (when grounded)
4 - Transmit (when grounded)
So .... two things are going on in a mic connector.... audio and RX/TX switching
Iin the Astatic microphone in the manual (and INDEED many others with more than 4 wires!) THEY have a separate Ground wire for audio (Sh) and another one for mode switching (blue).
A common 4 wire microphone has the same function to perform the same two functions....... only difference being...... the audio shield and the switching common.... are the same wire!!!!!
That is why, on the Astatic mic you see SH and BLUE tied together....to MAKE them the same function.
So the TRICK becomes...... taking the mic that YOU HAVE....and determining what function is on each color wire and make a little "table" of
COLOR = FUNCTION
Very typically white IS audio.....but PERHAPS not always....
Red/black are USUALLY transmit and receive...but YOUR mic may put it on a different color......
Typically the other wire is a plain uninsulated wire....or they use the braid from the shielded audio cable..(most of the time audio cables are a two wire shielded cable) ... and they just use the shield for ALL GROUND purposes.
So, back to the trick.... we KNOW what function needs to go on what PIN of the radio connector........but we may be unsure of what COLOR coming out of the mic serves WHAT function! And it is not always OK to use an adapter....because some manufacturers did not adhere to the same standard as others......
Usually you can determine this by opening the back of the mic and also opening up that mic connector. In a four wire mic the easiest thing to pick out will be the shield. Very commonly it has no insulation.... OR..... you can see one small cable that has a center wire coming out....and also has a shield wire coming out. Once you KNOW the ground.....
You will most likely have a RED and a BLACK. Set your meter for OHMS or for CONTINUITY..... clip ONE lead to that shield... the other touch it to the red and black... ONE of them should BEEP. IF it does..... KEY the mic. The beep should stop. If it does.... THAT one is your RCV wire. Now....clip still on the shield..... touch the OTHER wire. IT should NOT BEEP ...... UNTIL YOU KEY up the mic. When you release the key.... it should go silent. THAT is the TX wire.
The remaining wire.... is your audio.
With all of that.... you now know WHAT color is what function on you mic....
AND
You know what function needs to go to what pin on the connector
(be sure to use the numbers on the mic connector!)
Just unsolder the mic wires from the connector...and resolder each color/function to the correct pin for the radio.
Now you KNOW that mic matches the radio....for certain.
(by the way....at the VERY BOTTOM after typing all of this in..... it occurred to me that... you may ALREADY KNOW all this...... and that telling you anyway...MIGHT make you want to "beat the s##t" out of me for feeding it to you (that was SNOT of course!!!!! ). That said... I am leaving it here just in case. It could help someone else!)
ON the subject of the microphone..... the diagram you send...... appears to be attaching a 5 wire microphone to the Romar ACT-1914 radio.
I went out and found the Astatic Mic Wiring book and it tells me that nominal Astatic color code is:
White - Audio
Sh (shield) -Audio Shield
Blue - Switching common
Red - Transmit (when grounded)
Black - Receive (when grounded)
Yellow - Special Receive Ground (not normally used)
Now, from the Romar ACT-1914 wiring part, I see that the jack on the radio is:
1 - Audio
2 - Ground
3 - Receive (when grounded)
4 - Transmit (when grounded)
So .... two things are going on in a mic connector.... audio and RX/TX switching
Iin the Astatic microphone in the manual (and INDEED many others with more than 4 wires!) THEY have a separate Ground wire for audio (Sh) and another one for mode switching (blue).
A common 4 wire microphone has the same function to perform the same two functions....... only difference being...... the audio shield and the switching common.... are the same wire!!!!!
That is why, on the Astatic mic you see SH and BLUE tied together....to MAKE them the same function.
So the TRICK becomes...... taking the mic that YOU HAVE....and determining what function is on each color wire and make a little "table" of
COLOR = FUNCTION
Very typically white IS audio.....but PERHAPS not always....
Red/black are USUALLY transmit and receive...but YOUR mic may put it on a different color......
Typically the other wire is a plain uninsulated wire....or they use the braid from the shielded audio cable..(most of the time audio cables are a two wire shielded cable) ... and they just use the shield for ALL GROUND purposes.
So, back to the trick.... we KNOW what function needs to go on what PIN of the radio connector........but we may be unsure of what COLOR coming out of the mic serves WHAT function! And it is not always OK to use an adapter....because some manufacturers did not adhere to the same standard as others......
Usually you can determine this by opening the back of the mic and also opening up that mic connector. In a four wire mic the easiest thing to pick out will be the shield. Very commonly it has no insulation.... OR..... you can see one small cable that has a center wire coming out....and also has a shield wire coming out. Once you KNOW the ground.....
You will most likely have a RED and a BLACK. Set your meter for OHMS or for CONTINUITY..... clip ONE lead to that shield... the other touch it to the red and black... ONE of them should BEEP. IF it does..... KEY the mic. The beep should stop. If it does.... THAT one is your RCV wire. Now....clip still on the shield..... touch the OTHER wire. IT should NOT BEEP ...... UNTIL YOU KEY up the mic. When you release the key.... it should go silent. THAT is the TX wire.
The remaining wire.... is your audio.
With all of that.... you now know WHAT color is what function on you mic....
AND
You know what function needs to go to what pin on the connector
(be sure to use the numbers on the mic connector!)
Just unsolder the mic wires from the connector...and resolder each color/function to the correct pin for the radio.
Now you KNOW that mic matches the radio....for certain.