Difference between revisions of "Ka3jjz"
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− | Welcome to the Decoding the Shortwave Radiogram Broadcasts page. This page will help both newcomers as well as more experienced people | + | Welcome to the Decoding the Shortwave Radiogram Broadcasts page. This page will help both newcomers as well as more experienced people with topics regarding decoding the digital broadcasts as advertised on the [https://swradiogram.net/ Shortwave Radiogram] page. It's built in a Q&A style to make finding topics relevant to the user easier to find </div> |
==What Kind of Radio Do I Need?== | ==What Kind of Radio Do I Need?== |
Revision as of 15:16, 27 June 2019
Contents
What Kind of Radio Do I Need?
Just about any radio that covers the 2-30 Mhz range is capable of receiving these stations. It should be reasonably stable, selective and sensitive. This encompasses a wide range of radios, everything from portables, such as those from Tecsun and Degen, all the way to Software Defined Radios (SDR) such as the SDRPlay and Perseus. It doesn't need to be expensive. To begin your research, see our HF Equipment and Accessories and Software Defined Radios articles.
What About Antennas?
It's been often said that the better the antenna, the better your results. Unfortunately sometimes that is difficult to obtain; you may be in a situation where outdoor antennas are not allowed, or you have very little space with which to work. Our HF Antennas and Loops articles have plenty of possibilities. What radio you are using, your budget and circumstances will play a large role in what you can use.
How Can I Get a Better Signal?
If you have done as much as you can with your radio and antenna, but are still not satisfied with your results, there may be some more than you can do to improve your chances. See our Improving HF Reception for a discussion on this topic.
How Does the Signal Get to Me, Anyway?
We are very much at the mercy of the Sun when it comes to how signals get propagated across the globe. Unfortunately, as of this writing, we are in a very low period of solar activity, so we must depend on better radios and antennas to help. However, an understanding of how a signal propagates through the ionosphere is very important; this will help you to understand why a signal can be heard at some times but not others. See the AE4RV Propoagation Primer for a basic discussion on this topic. Be sure to turn your flash player on before looking at this site.
How Do I Connect My Radio (SDR) to the PC?
This is a topic that is difficult to define simply, as there are so many possible ways to connect the two together. The method used for connecting a portable radio or desktop is very different how you would connect a Software Defined Radio (SDR). See the Making the Connection to the PC article for an extensive discussion on this topic.
Connecting to a SDR
If you are using a Software Defined Radio (SDR), these packages will help with getting the audio to your decoder. In particular, VB-Cable or Virtual Audio Cable are the applications of choice for SDR users.
What Modes Are Being Used?
There are literally hundreds of different modems being used on the HF spectrum. Here, we are concerned with modes that are used in the amateur radio (ham) community, as software for these modes is readily available.
- What is MFSK? (from the SigID Wiki)
- What is Olivia? (from the SigID Wiki)
- Digital Modes Sights and sounds (fldigi wiki)
- Select MFSK from the top toolbar for this mode
- Select Olivia from the top toolbar for this mode
- For an explanation of Slow Scan TV (SSTV) and compatible software, see section 5 of the HF Software Decoders article
Where Can I Find Compatible Software to Copy These Broadcasts?
While FLDigi is the most popular software used for this, it's not the only one that's capable of decoding these broadcasts. All of these applications recognize the use of the RSID to aid in recognizing the mode that is being sent. Questions or issues with the software should be directed to the indicated mailing lists, where specific help is available.
- W1HKJ home page - home for FLDigi
- FLDigi Downloads Sourceforge site
- Need to install flmsg and flamp as well
- Fldigi Wiki
- fldigi mailing list
- Ham Radio Deluxe (includes DM780)
- TIVAR
- Android fork of FLDigi
Are There Any Examples of These Applications In Actual Use?
These are YouTube videos with examples of each application above being used to decode an actual broadcast. There are many other examples on YouTube and a well formatted search will bring them up
- Using DM780 (Ham Radio Deluxe)
- VoA Radiogram 7th july 2013
- 15670 kHz USB - VOA Radiogram - MFSK Transmission - 9-15-2013 19:51 UTC
- Voice of America Radiogram - Sept.22, 2013 19:55 UTC
- Setting the RSID in DM780 Ham Radio Deluxe
- Using FLDigi
- Receiving image in the Shortwave Radiogram 9400 kHz with Fldigi
- Shortwave Radiogram #84 Jan 25 2019 on 7780Khz Shortwave Radio R8600
- Decoding Shortwave Radio Gram using GQRX and FLDigi
- Shortwave Radiogram Program 98- Fldigi settings
- Using MultiPSK
- Decoding Shortwave Radiogram 26 in MFSK32 Dec 16 2017 on 9400 kHz with Multipsk
- Shortwave Radiogram #36. Received & recorded in Germany on 9400 kHz. Decoding with Multipsk
- SW Radiogram #33 on 9400 kHz shortwave received with AFEDRI SDR, MFSK32 decoding with Multipsk
- Using TIVAR (FLDigi fork)
- Decoding (MFSK32, MFSK64) with #Tivar of #Shortwave Radiogram 57
- Shortwave Radiogram Decoding text and image
- Shortwave Radiogram
- Return to DXing Digital Utilities
- Return to Testing Your New Setup