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digital signal processing
Greetings
I have problem which I am hoping this group may be able to help me out with... First a bit about me to help you out... I was licenced back in 1964 as ve3fxq.. and still have that same callsign... I was in ham radio when sideband was more or less came in.. I was around when fm and fm repeaters came in.. I was around when packet came in.. etc... However I seemed to have left ham radio around the mid 90's... Now during the past couple of years, I have been trying to come back... I have noticed, however, a strong element of hams talking about digital signal processing... They say that it allows you to do thinks like controlling the selectivity much better than we used to do with filters, etc... Here is where I need the help... I have looked at websites, which talk about dsp as if I already know what it is.. and try to sell me on a chip or kit or board which is supposted to do dsp.. but I am still trying to find out how dsp can help me ..... Is there a website which esplains dsp to someone who know basic receiver consepts and knows 1's and 0's but need help in understanding dsp... Larry ve3fxq |
Hi Larry -- Kenwood has an in depth manual on DSP - see TS-870S URL:
http://www.kenwood.net/?do=SupportFi...ry&FileCatID=5 -- CL -- I doubt, therefore I might be ! "larry" wrote in message ... Greetings I have problem which I am hoping this group may be able to help me out with... First a bit about me to help you out... I was licenced back in 1964 as ve3fxq.. and still have that same callsign... I was in ham radio when sideband was more or less came in.. I was around when fm and fm repeaters came in.. I was around when packet came in.. etc... However I seemed to have left ham radio around the mid 90's... Now during the past couple of years, I have been trying to come back... I have noticed, however, a strong element of hams talking about digital signal processing... They say that it allows you to do thinks like controlling the selectivity much better than we used to do with filters, etc... Here is where I need the help... I have looked at websites, which talk about dsp as if I already know what it is.. and try to sell me on a chip or kit or board which is supposted to do dsp.. but I am still trying to find out how dsp can help me ..... Is there a website which esplains dsp to someone who know basic receiver consepts and knows 1's and 0's but need help in understanding dsp... Larry ve3fxq |
And then if you want to play with it you might start with the digital
modes that use the PC and soundcard to create a modem. If you use Linux the stuff is open source so you can look at the code. Even in Windows there may be some open-source stuff to look at. -- jhhaynes at earthlink dot net |
Hi Caveat
I sent an emal message of thanks but it got bounced..sorry So thanks, in a public forum.. Larry "Caveat Lector" wrote in message news:Nqkoe.416$Cr.113@fed1read07... Hi Larry -- Kenwood has an in depth manual on DSP - see TS-870S URL: http://www.kenwood.net/?do=SupportFi...ry&FileCatID=5 -- CL -- I doubt, therefore I might be ! "larry" wrote in message ... Greetings I have problem which I am hoping this group may be able to help me out with... First a bit about me to help you out... I was licenced back in 1964 as ve3fxq.. and still have that same callsign... I was in ham radio when sideband was more or less came in.. I was around when fm and fm repeaters came in.. I was around when packet came in.. etc... However I seemed to have left ham radio around the mid 90's... Now during the past couple of years, I have been trying to come back... I have noticed, however, a strong element of hams talking about digital signal processing... They say that it allows you to do thinks like controlling the selectivity much better than we used to do with filters, etc... Here is where I need the help... I have looked at websites, which talk about dsp as if I already know what it is.. and try to sell me on a chip or kit or board which is supposted to do dsp.. but I am still trying to find out how dsp can help me ..... Is there a website which esplains dsp to someone who know basic receiver consepts and knows 1's and 0's but need help in understanding dsp... Larry ve3fxq |
Here is where I need the help... I have looked at websites, which talk about dsp as if I already know what it is.. and try to sell me on a chip or kit or board which is supposted to do dsp.. but I am still trying to find out how dsp can help me ..... That's a really big area and rather difficult to answer. Noise reduction is a very useful aspect of DSP. Depending on your rig, the filters can be helpful, too. As far as outboard DSP, you probably won't go too far wrong with a Timewave DSP-599zx. It's expensive, but the noise-reduction components are supposed to be quite helpful. A sound-card/computer approach that is very good is an older program known as DSP Blaster (db). I have searched high and low for a modern equivalent software implementation (something that can run on Windows XP, for example), and I have never heard its' equal. It has an agressive noise reduction component and an coherent CW filter which is hard to beat. I have found its' noise reduction unit to be quite useful in EME. The problem is Brian Beezley, the author, discontinued it. The program can still be found by a resourceful individual. Onboard IF DSP is supposed to be the best - especially when combined with AF DSP in the same rig. I don't know which radio has the best perfomance-to-cost ratio of such an implementation. 73 |
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