Audacy reducing HD power?

[derek20la]

ATSC1 does a horrible job with it but perhaps ATSC3 has addressed it.

Yes, 1.0 used 8VSB modulation, and 3.0 is using COFDM.

I recommend videos from Tyler The Antenna Man. In this video he is at NAB 2023 covering the new 3.0 tech and markets. At the 2:30 mark he shows a demo of Sinclair's proposed ATSC 3 radio standard.

 

[radiofan2023]

Yes, 1.0 used 8VSB modulation, and 3.0 is using COFDM.

I recommend videos from Tyler The Antenna Man. In this video he is at NAB 2023 covering the new 3.0 tech and markets. At the 2:30 mark he shows a demo of Sinclair's proposed ATSC 3 radio standard.

As much as I dislike Sinclair, their ATSC3 radio demo was cool.

 

[speer360]

As much as I dislike Sinclair, their ATSC3 radio demo was cool.

The ATSC Radio Demo is cool. As much I would like to see it turn into a DAB like system in the us.

Who’s gonna pay to put it in dashboards?

 

[Kelly A]

The ATSC Radio Demo is cool. As much I would like to see it turn into a DAB like system in the us.

Who’s gonna pay to put it in dashboards?

Answer: Nobody. Solution in search of a problem.

 

[Will_H_69_9]

The ATSC Radio Demo is cool. As much I would like to see it turn into a DAB like system in the us.

Who’s gonna pay to put it in dashboards?

the answer is no one cause Streaming is the now and the future of radio is internet based.

 

[pclover]

Yes, 1.0 used 8VSB modulation, and 3.0 is using COFDM.

Makes me wonder why ATSC 1.0 never used OFDM. There has been back and fourth arguments why it didn't. To me not using it was a stupid engineering choice. I guess cost savings as 8VSB uses less power then OFDM. Found this old thread https://www.radiodiscussions.com/threads/ofdm-vs-8vsb.570690/#post-5080880

Yes, OFDM has higher peak-to-average power ratio (PAPR) and requires amps to be much better and linear however, It handles fading and multipath so much better then a single wideband carrier. This is why any new RF standard uses it.

OFDM you can do things like a cyclic prefix to avoid intersymbol interference as well as channel equalization and channel estimation to clean up a signal. DSP is cheap now and RF bandwidth is expensive.

Looks like ATSC 3.0 is adopting LDPC FEC which is similar to turbo codes and very good.

 

[PTBoardOp94]

One of the big advantages of ATSC was that it was "spectrum compatible" with NTSC, meaning the FCC would not need to change the band plan for television. DVB-T uses an 8 MHz channel, compared to the NTSC standard of 6 MHz.

ATSC v1 was principally designed by Zenith and Bell Labs starting in the late 1980s. It was adopted by the FCC as the digital standard for the USA in the mid 90s. At that time, some of the technologies which made DVB-T possible may not have existed.

The fact that it took 20 years from invention to final adoption of ATSC is the real amusing bit here.