Friday, January 14, 2022

Screeshoting MW band in various times. DX in Salonica

There was a very rare case on being alone home in a place ,which  was previously very noisy to get some very stunning and near noise free receptions on 11.1.21 in parts of the HF band.LInk  goes to the HF part logging.

Each recording was limited to  2-3 minutes with TOHs in the center time -aimed only to listen  for IDs. the whole work resulted of 5 IQ files : 2 files for 5.8-8 MHz, the remain for MWbans
 Data mining on the 2 SW files yielded  around 3 hours of work.It is already posted in WordPress  with two screenshots and 80 frequencies A very serious reason to quit mining the MW band with 131 or more frequencies, And just post the screenshots with some basic comments

System consists of:

-2x16 m Λ  / 3x9 delta antennas, the best results for MW were made with the Λ antenna 
-RSP1a as band DSP processor
-SDRPlay with MW preset for Play 
-3/2 MHz bandwidth if SDRConsole is used for SW/MW respectively
-Heating radiator with 1.5mm wire for grounding .  
-IQ navigator-scheduler ) of SDRConsole. I rarely used it before. Knew the instant recorder. 
-bandwidth aligned and in programs 'favorites' pane


Photos are just posted with limited info/ Notice that the times in big letters show UTC+2 ie local time!
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855 R Romania Actualitata is one of the strongest signals in the band Some navtex on 518
Many Greek pirates in the X band


 Possibly no change in the band except in the Xband

 Uisng the SDRplay's IQ file It truncates the width and  lowers  end's efficiency

Again SDRplay preset bandwidth 

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This is the final photo on the next day  on 07z time . Its very interesting that the band even in the early morning at 9am can be useful for some remote signal monitoring with stations mostly from Romania


Comments are very highly appreciated

That means: expecting your comments !


4 comments:

  1. Mr. Liang: An interesting project, and an incredible amount of work. I'm curious, it is difficult to see the noise floor value in the image you posted that shows the 5800-6500 kHz band. Is it 125dBm? Curt - N6ATC

    ReplyDelete
    Replies
    1. As you can see the noise level in the WP page (link in the end of first paragraph)it is upcurved towards the middles with minimum of -120dbm at the edges with maximum of -113dbm

      In order to watch the picture for better detail you can right click the photo and open on a new tab then zoom as much as you can.

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