| Author |
Message |
    
Missie
New member
Username: Missie
Post Number: 1
Registered: 10-2006
| | Posted on Wednesday, October 04, 2006 - 7:55 pm: | 
|
Does any body know how to put talk back in A presedent Jackson radio? Can't find any info any where |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2134
Registered: 9-2004
| | Posted on Wednesday, October 04, 2006 - 9:17 pm: |
|
1)Cut D-71.
2)Solder a wire from PIN 1 of IC UPC-1242H (audio chip) to PIN 2 of the mic socket.
3)IF...the talk back is to loud then install a 100 -500 ohm resistor in series to the mic socket.
4)IF...the receive audio drops then install a .01 uF ceramic disk capacitor in series to the mic socket.
hope this helps,
matt |
Starface
Advanced Member
Username: Starface
Post Number: 795
Registered: 1-2005
| | Posted on Thursday, October 05, 2006 - 12:03 am: |
|
I have also found that soldering a 100 ohm resistor on the board side, one to the Speaker External jack and the other to the PA jack works well without cutting anything. |
Dx431
Senior Member
Username: Dx431
Post Number: 1189
Registered: 2-2002
| | Posted on Thursday, October 05, 2006 - 2:22 pm: |
|
If it's the black face Jackson......it should
already have talkback in it.
I had one yrs ago and had the talkback dissabled... |
Missie
New member
Username: Missie
Post Number: 2
Registered: 10-2006
| | Posted on Tuesday, October 10, 2006 - 9:48 pm: |
|
kid vicous tried talk back on this pres jackson cut d71 soldered wire put in restor still get feed back and way to loud cut jumper and talk back still works the same any ideas? |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2146
Registered: 9-2004
| | Posted on Tuesday, October 10, 2006 - 11:31 pm: |
|
missie, im sorry i cant help much, but i found this info on the net by googling "president jackson talkback".
have used info from same site with good results.
lots of times, the talkback will feedback because the modulation limiter is cut, and a power mic is being used. if this is the case, there is not much you can do but turn the audio down some.
if you are using the internal speaker, try using an external speaker, and keep it away from the mic.
you might try increasing the value of the resistor to 1K, and placing a .01uF cap between the audio and ground wires on the mic jack. if there is no change, then try STARFACE's method.
sorry i cant be of more help,
matt |
Missie
New member
Username: Missie
Post Number: 3
Registered: 10-2006
| | Posted on Wednesday, October 18, 2006 - 11:02 pm: |
|
Kid Vicious thanks I never thought about the mod limiter being cut (just got this one) put it back in it works fine. if your like me and save all the onfo you get ,on this one you don't need the jumper from the autio chip to the mic pin. thanks again! |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2164
Registered: 9-2004
| | Posted on Friday, October 20, 2006 - 12:03 am: |
|
cool deal missie,
glad you got it working.
if you have the old secret CB books, there are quite a few mods for that radio in them.
good luck,
matt |
