pos1

galileo figarooo;) there may be a number of other reasons for mono but without a spectrum analyzer it all comes down to speculation. first, the simplest, try listening on another radio. If it is on the other “mamma mia” on both channels, there is a suspicion of a realteck chip that cannot push a flat response up to 57KHz or is up to a transmitter with a similar problem.

What you can try is the following: on another computer that has a 192khz sound card (assuming it’s ok), install cooledit / audition. On line in connect the BAO signal from the first computer. Enable quick sweep in BAO settings. On cooledit choose 192KHz recording. During recording, choose spectral analysis.

If everything is OK you should see an almost straight line up to 57KHz. If you see more attenuation on any part of the spectrum, a sound card is not ok for this purpose.

@MPX There is no need for such reactions. Like I said, I appreciate anyone who spends their time on BA one and shares the effort with others on the forum. However, as the experience of sound is a subjective category, not everyone has to like what you are doing. The same goes for my or anyone else’s work.

Personally, when setting up the FM processor, i am guided by the criteria that the preset must sound decent on the reference system, and on mid-range Hi-Fi, and on low end portable fm receivers. All this requires a compromise and that is why it is difficult to make a proper preset. Yet if the station broadcasts a variety of genres, we are on our way to an impossible mission.

And yes, my monitoring equipment is so-so Studer ball receiver + Genelec. 😉 But that’s just one of three components on which the sound has to be decent!

I wish you good luck in your future work!

No matter what is on the input of BA ONE soft should not have overshoots at the output. KKaras: the key thing is a sound card with a linear characteristic, a properly adjusted square and flat response compensation. Another thing is also the linear characteristic of the mpx input of the STL. If the phase and amplitude response is not good, then overshoots are present. Also the mod meter on STL does not have to be 100% accurate. For example, Radio doo lcd-ledbar STL can show up to 5-10% more deviation compared to a professional modulation monitor. It’s similar with their latest series of LCD transmitters

hmm, you shouldn’t behave like that. Before the next step, check the stereo separation by turning off one of the channels going to the processor. If it is bad or not there is an attenuation in the MPX channel. If it is already ok we go on to look for a suspect.
Try downloading the trial version again. Previously, deep delete the application. Set umc202hd to 192khz sampling rate. For the test, use the headphone output from the sound card (there is a possibility of incorrect wiring of the cable between the sound card and the transmitter – symmetry / asymmetry which can result in a similar problem) After reinstallation and selected preset, in BA one application graph pilot must be at -20db. Feed BaO with sound material. Average Input level should be in the range -10 to 0dB. At the same time the MOD indicator in BaO should be 100% (peaks). Set MPX limit to max + dB value (in I / O main).
Now over Inovonics 531 read deviation. If you don’t get match deviation and pilot levels (+ – few percents overshoots) we go to the next step. Connect Inovonics 531 to PC and select graph and metering. In BaO MPX out play test mpx slow sweep. View the result of the Inovonicis graph. The frequency response from 30Hz to 57KHz must be within + -0.5dB (flat). If there is a significant deviation here, something is wrong with the hardware after the BaO. If this doesn’t help either, the only option is to write directly to Leif, or try another software solution. If the hardware is ok set up, you have a very strange and rare case.

I had the opportunity to test several sound cards with BA1. As a reference transmitter I used the RVR link of the PTRL NV series, with very good phase and amplitude response.
The results are as follows:
UMC HD 202
perfect square 60Hz: tilt BA1 = 0
MPX response:
+ 0.3dB at 30Hz; -0.8dB at 57KHz
+/- 0.3dB from 30Hz to 45KHz

Disadvantages:
– nasty noise that starts to grow exponentially from 60 + KHz (visible only with an oscilloscope or spectrum analyzer)
-very low main out level

M-Audio Air 192/4
perfect square 60Hz: tilt BA1 = 8
MPX response:
+ 0.5dB at 30Hz; -0.2dB at 57KHz
+/- 0.2dB from 60Hz to 60KHz

Disadvantages:
-unstable work with older computers (core2duo). The sound is intermittent.

Presonus studio c28
perfect square 60Hz: tilt BA1 = 15
perfest square 60Hz (HP out) = 4
MPX response:
-0.2dB at 30Hz; -1.8dB at 57KHz
+/- 0.5dB from 60Hz to 30KHz
Disadvantages:
-Significant rolloff at 57KHz
-Audible audio echo loop if card input and headphone output are used

scarllett 2i2 3gn
perfect square 60Hz: tilt BA1 = 7
MPX response:
-0.2dB at 30Hz; -1.1dB at 57KHz
+/- 0.5dB from 60Hz to 35KHz
Disadvantages:
-ground loop PC problems (audio interference)
-a nasty noise that starts growing exponentially from 60 + KHz identical to the con Behringer card

My choice: If you know how to make a sharp low pass damping filter 60KHZ +, a good choice is the Behringer 202 or 404, primarily because of the price. It should be noted that the line in inputs are slightly lighter, so the eq input parameters need to be further adjusted.
Also the output from this card is quite low, so with individual broadcast equipment it may not be possible to achieve 75k deviations without additional preamp. The headphone output can serve as an improvisation for this purpose.