Trying to install discriminator tap in pro 39 I have wired it several ways still no audio showing on mic jack.Im using double ended 3.5 cord with one end cut off.
help tapping pro 39
- Thread starter bishgeo
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n4yek
Member
Unless you show pics of your install, it is hard to tell you which way to go.
All I have found is that your tap will be from pin 9 of a chip labeled with 3361
All I have found is that your tap will be from pin 9 of a chip labeled with 3361
I can dig out my service manual, if you need pointers. (I think I know where it is.)
Sent via Tapatalk
Sent via Tapatalk
don't know how to post pics.
jfhtm350
Member
Click "Go Advanced" where you post a message then scroll down to additional options and click mangage attachments.
Or........
You can set up a photobucket account (or other such service) then paste the link to the file here.
Or........
You can set up a photobucket account (or other such service) then paste the link to the file here.
jfhtm350
Member
According to this page:
Discriminator tap points
The Pro51, Pro44, etc should be similar.
Here is some more technical jargon:
Scandata faq q2 - The RadioReference Wiki
Here is a thread on the Pro51
http://forums.radioreference.com/ge...lp-installing-discriminator-tap-pro-51-a.html
Here is the Pro37. It has a question mark beside it so it looks like it was in question.
Discriminator Output Realistic PRO-37
Those should give you a good idea where to go, but if you have had it wired up several times then you may have burnt up your scanner. There have been several bricks made by installing a tap. Does the scanner still work?
Discriminator tap points
The Pro51, Pro44, etc should be similar.
Here is some more technical jargon:
Scandata faq q2 - The RadioReference Wiki
Here is a thread on the Pro51
http://forums.radioreference.com/ge...lp-installing-discriminator-tap-pro-51-a.html
Here is the Pro37. It has a question mark beside it so it looks like it was in question.
Discriminator Output Realistic PRO-37
Those should give you a good idea where to go, but if you have had it wired up several times then you may have burnt up your scanner. There have been several bricks made by installing a tap. Does the scanner still work?
bigbud42010
Member
Yea his radio still works we just can not find the right tap point for that radio
Im thinking he might need to find a cheap pro-164 like i got ill help him with it if he gets one!!
Im thinking he might need to find a cheap pro-164 like i got ill help him with it if he gets one!!
jfhtm350
Member
How many names do you have? Not sure who I'm talking to now.
Does it not look like the pro51 on the inside?
The picture is a little blurry but you can tell you solder to the metal finger on the end on the side of the chip. You know you have to have a resistor and stuff dont you?
jfhtm350
Member
Oh ok. I see that now that I reread the post he made. Sorry.
Looks like your on the right chip. Looking at the orientation of the 3661 chip here http://forums.radioreference.com/ge...lp-installing-discriminator-tap-pro-51-a.html it appears your on the right pin. Its hard to tell from the pic but it looks like your solder is right up against D201 which wouldnt be good.
Where is your capacitor?
Do you know what resistance the resistor is?
What color are the bands on it?
Here he is using a 10k resistor. Discriminator Output Realistic PRO-37 which is brown, black and orange. If yours is brown, orange and green then that is a 1.3m ohm resistor.
Resistor color code calculator - 3, 4 and 5 band resistors
It looks like your shield wire is grounded to the frame. I dont know but I dont think its supposed to be maybe someone else will chime in.
slicerwizard
Member
And you're feeding the signal to the right channel (ring)? Any particular reason why? Are you sure that the mic jack is stereo?
jfhtm350
Member
Ah Ive gotten turned around here somehow thinking that was a mono plug which it looks like a stereo plug to me.
Arent you supposed to use a mono plug?
If you use a stereo plug then wouldnt the red and black wire have to be hooked together and the shield grounded?
Hey guys I am just stumbling around here just going off what I can read and see.It is a 10k resistor from radio shack I believe it is a stereo plug it has two rings on jack it had two ends on it I cut one off.None of the installs I have read say mono or stereo so I don't know either.
jfhtm350
Member
Im not sure whethere you need a capacitor or not. Ive seen some that use a capacitor and some that dont. I know what they are but not sure why they are used. Maybe someone will clarify why they are used.
You need to use a mono plug or jack (computer microphone plugins are mono if that is where your going to plug it). You can always get a mono to stereo adapter later if you need it. The mono plug is only going to have 2 connections.
1) The center wire or positive: connects to the resistor or capacitor. Where your red wire is now.
2) The shield or ground: connects to the scannner ground. Where your shield wire is now.
Before you try to cut the black wire off and use the stereo jack with a mono plug, dont. Just do yourself a favor and use a mono plug or jack. Use a multimeter and check the resistor to see if you get anything through it to make sure it isnt fried.
You need to use a mono plug or jack (computer microphone plugins are mono if that is where your going to plug it). You can always get a mono to stereo adapter later if you need it. The mono plug is only going to have 2 connections.
1) The center wire or positive: connects to the resistor or capacitor. Where your red wire is now.
2) The shield or ground: connects to the scannner ground. Where your shield wire is now.
Before you try to cut the black wire off and use the stereo jack with a mono plug, dont. Just do yourself a favor and use a mono plug or jack. Use a multimeter and check the resistor to see if you get anything through it to make sure it isnt fried.
soldered on a new mono wire with plug still no sound when plugged into mic jack on laptop..
jfhtm350
Member
Ok. Good.
Found some information on the resistor and capacitor you might want to look at.
FAQ Discriminator Output
Descriminator Outputs - #6, #8
Found some information on the resistor and capacitor you might want to look at.
FAQ Discriminator Output
Descriminator Outputs - #6, #8
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