• 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

Unknown interference?

Status
Not open for further replies.

jrud03

Member
Joined
Jan 31, 2006
Messages
11
I recently hooked up my RS 2096 to a RS 20-176 antenna mounted to a 12ft steal pole on my roof. I am receiving incredible distance and great reception on conventional and digital freqs but for some reason my 800mhz trunking system which is 3 miles away I'm getting interference on those systems. The control channels tell me I'm receiving a 99% signal strength yet every so often I will get really bad interference.

It's not static but sounds like a possible power interference.
So I tried to resolve this by plugging my 2096 into a grounded power bar and unplugging different things in the room but it's still getting the interference. The interference isn't constant thing but happens periodically.

One thought is my grounding. I have the antenna grounded to a exhaust pipe on my roof my thought was that it was grounded but I wasn't sure.

Any advice would be helpful.
 

N1BHH

Member
Joined
Mar 31, 2007
Messages
1,843
Location
Jackson Square, East Weymouth, MA.
If it's a cast iron pipe, sometimes depending on construction, and reconstruction, it may not have a complete connection down the full length of DWV (drain, waste, vent) pipe. I would go check everything in your house first, throw breakers to isolate the source location. Maybe you have a loose connection somewhere. It could also be something at the trunking site. Do some more detective work, I'm sure you can find it.
 

Ghost4658

Member
Premium Subscriber
Joined
Feb 13, 2006
Messages
158
Location
Mayflower Ar.
Have you tried the ATT on the trunking channels.
I have some 800Mhz trunk digital close to me and i have to use the ATT on them to make them work clear.
 

zz0468

Member
Joined
Feb 6, 2007
Messages
5,974
Location
175 DME, HEC 358° Radial
A few possibilities... I've seen people call digital modulation "interference" when they had no clue what it is. Can you capture a recording and post it here? There's a lot of technical talent here, and someone may be able to identify the sound.

I've also seen plenty of real interference on 800 MHz, including sources like illegal import security cameras, frequency hopping SCADA devices, bi-directional amplifiers oscillating because of poor installation practices, and intermod, just to name a few. If it's a real signal out there, it's highly unlikely you'll be able to do anything about it without the ability to hunt it down, and the resources to actually get someone to fix it if necessary.
 

kb2vxa

Completely Banned for the Greater Good
Banned
Joined
Mar 22, 2005
Messages
6,126
Location
Point Pleasant Beach, N.J.
When it comes to interference the possibilities are endless so the focus now becomes grounding. A vent pipe even if cast iron is anything but electrically continuous. There are no firm connections, only ends sitting in flanges with oakum stuffed in to make them airtight. If you want your antenna properly grounded run the standard copper (never aluminium) grounding wire and earthing rod.

Actually a vent pipe mount can be dangerous, I wouldn't want to be sitting on the toilet when the antenna takes a hit.
 
Status
Not open for further replies.
Top