DRM Software Radio Forums  

Go Back   DRM Software Radio Forums > DRM Software Radio - User Forums > General Topics
User Name
Password
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 02-11-2007, 14:39   #1
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
What's this?

A real beginner's question?

What's this? I always get this on 1611 kHz and 729 kHz.


Kind regards
Attached Images
File Type: png drm.PNG (5.4 KB, 663 views)
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Old 03-11-2007, 10:16   #2
Richard Davis
Registered User
 
Join Date: Apr 2007
Posts: 9
It's probably the carrier of a co-channel AM station.

73

Richard G3TDL
Richard Davis is offline   Reply With Quote
Old 03-11-2007, 11:15   #3
carknue
Registered User
 
carknue's Avatar
 
Join Date: Dec 2002
Location: Frankfurt, Germany
Posts: 1,321
I don't think that you have a co-channel carrier on 1611 khz. I think that this are interferences from the DWT itself or the PC. The DWT has a lot os these interferences an you can see themin weak signals.
__________________
regards, Carsten
AOR 7030 + Wellbrook ALA 1530P & DWT + Degen DE31 + TG33

Free DRM Tools for analysing, controling and automating your DRM reception and logging
carknue is offline   Reply With Quote
Old 03-11-2007, 11:26   #4
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
I remember listening to 729 without any problems. I can listen to OldieStar 1575 with out these interference.
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Old 03-11-2007, 11:36   #5
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,893
"Birdies"...
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 03-11-2007, 11:38   #6
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
?

Quote:
Originally Posted by mitajohn
"Birdies"...
???



Thanks for your detailled answer
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Old 03-11-2007, 11:44   #7
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,893
...Well, image frequencies or mixer byproducts...
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 03-11-2007, 12:07   #8
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,893
....Something like the one in the attached png. The pike is not an AM TX interference, its a RX's faulty mixer byproduct !
Attached Images
File Type: png Birdie_6095.png (24.5 KB, 296 views)
__________________
Regards, John.

Last edited by mitajohn : 03-11-2007 at 13:13.
mitajohn is offline   Reply With Quote
Old 03-11-2007, 12:59   #9
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
Ah! I see.
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Old 05-04-2008, 11:16   #10
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
I just found out that the "birdie" on 729 and 1611 is actually QRM of my notebook's touchpad...
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Old 05-04-2008, 12:16   #11
mitajohn
Registered User
 
mitajohn's Avatar
 
Join Date: Nov 2002
Location: Athens - Greece
Posts: 6,893
April 05

Have you taken care of it and how ?
__________________
Regards, John.
mitajohn is offline   Reply With Quote
Old 06-06-2008, 21:02   #12
drmdab
Registered User
 
drmdab's Avatar
 
Join Date: Dec 2006
Location: Germany
Posts: 688
Hi John,

well I think the only way to avoid this QRM is using a usual PC mouse in future.
__________________
RX: Elad FDM-S1
drmdab is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is On
Forum Jump


All times are GMT. The time now is 01:24.


Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.