Signals moving the opposite way of my tuning

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Ben1551
Posts: 3
Joined: Sat Aug 27, 2016 1:08 pm

Signals moving the opposite way of my tuning

Post by Ben1551 » Sat Sep 03, 2016 9:15 am

The best way is to show it with a photo Image
My antenna setup isn't the best right now so that cant be helping.
Last edited by Ben1551 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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DanubeBCL
Posts: 203
Joined: Sat Jul 02, 2016 12:39 pm

Re: Signals moving the opposite way of my tuning

Post by DanubeBCL » Sat Sep 03, 2016 3:37 pm

Hello,
the signals moving from left to right must be "ghosts", that is mirror products due to overload/intermodulation in a tuner stage. Try to reduce tuner gain.
Are there strong local stations near you?
73, Heinrich
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CaptainNemo
Posts: 146
Joined: Mon Jan 05, 2015 1:22 pm
Location: Genoa - Italy

Re: Signals moving the opposite way of my tuning

Post by CaptainNemo » Sat Sep 03, 2016 5:16 pm

I suppose they are artifact (images and so on).
It is common in a "low cost" sdr systems.
Trying to reduce those artifact -- setting gain, bw, filtering etc... -- is part of our hobby...
Maybe not the best part... sometime can be annoying... :roll:
bye
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Ben1551
Posts: 3
Joined: Sat Aug 27, 2016 1:08 pm

Re: Signals moving the opposite way of my tuning

Post by Ben1551 » Sun Sep 04, 2016 10:42 am

I have one station near me "BBC radio Devon" i have another cheap (£5) radio and it picks up this station no matter what frequency you are tuned to if it is connected to my big antenna.

Talking of the antenna it is probbaly the worst you could think of in the worst location
Image
Yes thats right a cb aerial covered on both sides by a roof by any chance was the roof acting as a mirror?
Also dont laugh too much at my artwork i never got a proper picture of it
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Ben1551
Posts: 3
Joined: Sat Aug 27, 2016 1:08 pm

Re: Signals moving the opposite way of my tuning

Post by Ben1551 » Sun Sep 25, 2016 12:59 pm

The newest version of the sdruno software has fixed this problem

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