• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

SC150Y Discriminator Tap Mod

Status
Not open for further replies.
Joined
Jun 28, 2006
Messages
8
Location
Quebec
#4
I can see my self putting a ceramic condensator to block the DC. But I dont see why you would put a resistor. What pin did he tap on the IC ?
 

K4OC

Member
Premium Subscriber
Joined
Mar 2, 2008
Messages
110
Location
Clayton, NC
#5
matthoward said:
I've had a few requests for pictures of the disc tap on my Uniden SC150Y, so here they are: Let me know if you have any questions.

Not sure where you tapped. Did you go on the underside and tap instead of tapping off the leg of the IC? I tapped mine but I think I separated the board and got access to the other side and tapped there. I used hot glue to provide strain relief. If I get my time I will post my pictures too.
I use my SC150y for the 868.7875 source for UniTrunker and T4WIN. I run them both.

The only thing I might do later is go back inside and couple the tap to the discriminator output via a capacitor. I did not have the correct type laying around at 2am when I performed my modification.

I'll keep in touch. Thanks for posting.


Sam Cederas
K4OC
Raleigh, N.C.
442.075
 
Joined
Aug 27, 2006
Messages
93
#6
madonion said:
Could you do a brief description of what you did please ? I have the same scanner.
I pretty much followed these directions for a BC245XLT:
http://www.discriminator.nl/ubc245xlt/index-en.html

slicerwizard said:
It looks like he did a direct connection tap - no isolation resistor, no DC blocking cap. Not a good idea. Kids, don't try this at home.
I'm no electronics expert. It works fine as is. Could you explain why I should not have done it the way I did? I'm not that concerned about damage to the scanner. I was about to trash it because everything in my area is trunked, but then I realized I could still use it for the disc tap.
madonion said:
What pin did he tap on the IC ?
I'm not sure how else to describe it other than if your looking at the chip (or "IC"?) with it oriented so you can read the markings I taped the top-right pin.
 

Airdorn

Member
Premium Subscriber
Joined
Mar 9, 2008
Messages
428
#7
slicerwizard said:
It looks like he did a direct connection tap - no isolation resistor, no DC blocking cap. Not a good idea. Kids, don't try this at home.
Could someone explain this instead of just poo-pooing it? I'd be interested to know why a cap and resistor is needed.

Thanks!
 
Status
Not open for further replies.
Top