Forum Replies Created
-
Posts
-
[quote author=”Leif”]Hi Jorge!
Yes, you do. Luckily, with AM you can connect a scope and look at your RF carrier directly, so you can adjust tilt and peq very accurately.
///Leif[/quote]
…And works great Jorge!!
But Leif…. please ,in the next release, include a preset for AM!!
Ciao
Adriano
Hey Cam… i think you have to work hardo on the linearity of your STL-TRANSMITTER system… most of the problem in this configuration are inside the stl receiver.. ( rf and Lf filters… and quadrature demodulators)
You CANNOT solve nothing with a composite clipper , if first you have not a copletely linear tansmission chain.. FROM MODULATOR TO ANTENNA ( including ros problems, bad matched armonic filters end others… ).
Composite Clipping give you a spectrum "energyzed" version of the audio given by an audio processor… but this "energyzed" signal is the most fragile signal you can have to treat.
Normally the most of the clipping , in normal audio processing , is in the bass region , due to the energy of the bass spectrum , and in the 3-15 Khz region , due to the preemphasis…. this can be handled by an audio processor…. Mpx Clippers take all this shit and make a bigger mess!!! clipping again all togheter!What you need ( i think) is an "Oveshoot compensation cure" , first matching all your transmission chain , and then an overshoot compensator at the transmitter site.
Overshoot compensator ( if correcly used ) can give you more REAL modulation , and less overshoot… this is one of the keys to be LOUD AND CLEAR..
If you need more PROCESSING , tune your processor , don’t destroy the Mpx spectrum…
Ciao from ItalyAdriano.
[quote author=”Leif”]Indeed. Broadcasters tend to focus on the things that are audible (as anything else means less loudness), but this is why the high pass filter is defeatable.
Best,
///Leif[/quote]
Filtering the lower band give benefits also in the AFC loop in the Pll Exciter, giving more stable stero image and reduced channel occupation when observed with a spetrum analizer in "max Hold" , but Why not lower the High-pass to 20 Hz ? , i have measured lots of fm exciter , and they don’t show frquency drift until you don’t go lower to 10 Hz.. so 20 Hz can be a good compromise??Adriano.
Hi to all , now the streaming http://217.133.30.28:8100 is feeded by a MICROGEN Ts9000a the old technics st-7200 was ready to go Bananas!! 😀
Now i think is more similar to the real on-Air sound
Bye
Adriano
Ps: Breakaway is rocking the airwaves in a SW station here in Europe … it sound FANTASTIC with 130% positive peak modulation!! i LOVE the tools to linearize the modulation envelope!! Great work Leif , also for the AM!!
HI Leif, i answer because of some difficulties to explane the fact of Luk 🙂
This second srteam is another "unofficial" ant test Stream.The firsts , (the one that you have emulated the soun , is stilla ctive and is an Orban 8500 feeding the streaming encoder via the HD output, the pourpose of this test was to find a quite cood compromise between Inpact and artifacts ( Hi perfectly agree, the hi end of my stream was terrbly distort at the time of your "cloning") The target for this steam is intended for people with a good reproduction media , the sound is adapted also at the "format" of the radio station.
This second stream is an ANALOGIC, old , malfuctional, Internatinally known as a "nightmare" for a lot of people thet has used it.
Thi processor is feeded by the main program line and his out is connected to an analogic FM EXCITER., a tuner is feeding the streaming encoder, so this temporary stream is what comes from an fm Tuner ( an old old Thecnichs) .
I have "found" this processor standing in a corner of my Lab , and i have done this test, pubblishing the URL of the stream on another forum just to have impressions … Luk has heard this test , and wanted to try to emulate this one for his On air Breakaway broadcast processor 🙂Adriano
