WA Radio Scanner Users' Group

Providing a voice for responsible scanner users in Western Australia
It is currently Tue Feb 28, 2017 11:08 am

All times are UTC + 8 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Fri Feb 21, 2014 7:31 pm 
Offline

Joined: Thu Jan 23, 2014 5:43 pm
Posts: 74
Very strong interference when in scan mode it stops oh 469.1625 with just static


Top
 Profile  
Reply with quote  
PostPosted: Tue Feb 25, 2014 5:56 am 
Offline
Moderator
Moderator

Joined: Sat Feb 09, 2008 10:06 am
Posts: 3081
Location: Just on the border of your waking mind
Some scanners let you program in frequencies to skip when doing a search. Have a look at the manual.

_________________
Rob
OF78WD
 Amateur moderator
.
Arguing with a fool proves there are two


Top
 Profile  
Reply with quote  
PostPosted: Tue Feb 25, 2014 6:58 am 
Offline

Joined: Thu Oct 04, 2007 8:25 am
Posts: 70
Location: Right here
Diceman wrote:
Very strong interference when in scan mode it stops oh 469.1625 with just static


The first trick is to establish that it is a birdie and not local interference or harmonic or mixing.

If you remove the aerial and the noise is still present, then it is an internally generated signal or birdie. If the noise disappears then it is more than likely an externally generated signal, assuming that it is not a strong signal being generated by a computer or in some case digital TV or the like.

If it is a birdie and depending on the scanner you maybe able to lock it out. Otherwise it is going to be annoying. If it is a locally generated signal then moving the scanner within its environment (the shack) may help. An externally generated signal may take a bit more effort such as directional antenna, relocation of the antenna or filtering.

If it is a harmonic, then there is little that can be done, unless you can alter the IF stages of the scanner. Some can, most cannot. Again not knowing the radio involved makes it difficult to know. Mixing is a third product of two separate signal coming together to form a third. Usually a garble of voices and or data or both. Again not much that can be done, short of experimenting with aerial placement.

It is going to be an interesting exercise in RF behaviour.

R


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: Bing [Bot] and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group