• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

Need some SWL info.

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RUSHFAN

Member
Joined
Jan 18, 2010
Messages
40
Hey guys,
I've been thinking about getting into SWL,and just wanted to know if there is a real world of difference in
getting a receiver that only has PLL,or one that has PLL and DSP?
Any info is appreciated!!
RUSH
 

ka3jjz

Wiki Admin Emeritus
Joined
Jul 22, 2002
Messages
21,770
Location
Bowie, Md.
This is a tough question to answer, since DSP can be used in many different ways.

DSP can be used for audio processing (the R75 uses this for noise reduction and notches). There are software defined radios that are DSP driven. It's really a preference that a person has to make for themselves - if it's used like in the R75, it takes a fairly good ear, and lots of patience, because it can make the signal sound worse if not adjusted properly (I've played around a little with it, but not much...). Once adjusted properly it can really be helpful

I'll let the R75 folks argue the merits of the DSP unit - it's pre-installed by Icom - and I'd throw a question or two on our Software Define Radio forum (we have a separate forum for both) if you're interested in either. At least to me, audio recovery is the real key here - does it make a weak signal sound better (not stronger - that's not the same thing)? Does a fairly solid signal sound natural, or metallic? How is the DSP implemented? These are fairly important questions to answer.

It's a toss up, frankly.

Mike
 
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