Discuss DTV: SatelliteGuys Forum DTV USA Forum AVS Forum Digital Home Forum

   RabbitEars.Info   
Sitemap
  

Monday, September 2 2019

Doug Lung Shout Out to RabbitEars Search Map

Doug Lung wrote an article on Phase 4 of the repack for TV Technology, and in doing so, highlighted the RabbitEars Search Map as a tool to use for resolving reception issues. Thanks, Doug!

Link is here: https://www.tvtechnology.com/repack...

Tuesday, August 13 2019

Away from Keyboard

This is a note that I will be out of town and away from my keyboard until the middle of next week. I may find a bit of time here and there to work on things, but spent yesterday on a plane and am now several time zones away from home. Don't be surprised if you don't hear from me for a while.

Tuesday, August 6 2019

Arizona TV Station Update - July 2019

The Arizona TV Station Update covers news about TV stations viewable in my home state of Arizona. I claim no rights to the format, so if anyone wishes to report news about other regions, please contact the webmaster.

As always, questions, additions, comments and corrections welcome.

New Licenses

  • KEJR-LD 40.x Phoenix (HC2 Station Group Inc.) has been granted a license to cover its displacement construction permit and to change towers within the South Mountain antenna farm. Technical specifications: Ch 32; TL 33° 19' 57" N, 112° 3' 59" W (South Mountain); ERP 15 kW directional (1° electrical beam tilt); HAAT 471 m.
  • KTVP-LD 23.x Phoenix (HC2 LPTV Holdings Inc.) has been granted a license to cover its displacement construction permit and to change towers within the South Mountain antenna farm. Technical specifications: Ch 23; TL 33° 19' 57" N, 112° 3' 59" W (South Mountain); ERP 15 kW directional (1° electrical beam tilt); HAAT 471 m.

Continue reading...

Sunday, July 21 2019

RabbitEars Search Map Enters Public Beta

I'm pleased to launch the RabbitEars Search Map into public beta. I mentioned in my previous site update that I wanted to do it, but it stuck in my head and I decided to buckle down, dedicate most of my evenings and weekends to it. It's paid off, and I think it will work out really well.

So here's where to go see it: https://www.rabbitears.info/searchm...

It gives multiple means of choosing a location, the results have a handy link to a page that anonymizes the results, it's a ton faster than the existing search code, and there are nifty maps and diagrams to help understand what is going on in specific situations. Please feel free to provide as much feedback, good and bad, as possible. I want to know what I got right and what I got wrong. If I got things wrong, I can probably adjust them.

Beyond that, there are a few things I want to note about it.

First, if you have questions, please be sure to read the instructions. If they're not clear and/or don't answer your question, please let me know. I want them to hold the answers to all the questions people have, if possible.

Second, the terrain path profiles remain under construction. If at some point you look at it and it looks wrong or doesn't work, wait a few minutes and try again. I'm probably working on it. If it lasts a long time, let me know as I may not have noticed that I broke it, or you may have found a corner case that I need to investigate. But the key thing I'm still working on is trying to make it possible to either adjust the height of the display or, preferably, automate the resizing of the height. It's proving more difficult than I expected, and I decided not to hold the release of the whole tool over that one item.

Third, unlike other things on the site, the underlying database is a snapshot of the RabbitEars database as computed each morning. This was done to help speed things along; by dumping the database once into a simplified format, rather than having to parse all the LMS tables each time a search is run, the speed was drastically improved. Additionally, in the interest of consistency, these rows are stored along with the results for a study, so the information in the result link should remain consistent even if the database changes. The only exception is the repack data column; that is tied to live data because it may provide an insight into what's going on for someone who is confused about the current status of things.

Fourth... I feel like I'm forgetting something. I may update this post in the next few days if I think of more comments I wanted to make.

Finally, I'd like some people to check behind me on some of the math. I'm reasonably confident in it, but having additional eyes on it would make me feel a whole lot better. There are three things, specifically, that I am concerned about.

1) The formula for converting from dBuV/m to dBmV in the unit conversions. (The dBmV is then converted to either dBm or dBuV if necessary--those conversions are fine.) I derived the formula from two other formulas with common elements, but I'm not entirely certain I applied them correctly or even that my result makes sense. I don't do a lot of these types of conversions. My end result was:

20 * LOG10 ( ( POW ( 10, ( s.field / 20 ) ) / ( .021 * s.freq ) ) / 1000 )

Where s.field is the field strength in dBuV/m, and s.freq is the center frequency of the station in question. If someone has a different formula that is more correct, please let me know.

2) The formula for earth bulge as used in the terrain path profiles. I already changed it once.

( ( 1000 ) * ( 1 / ( 2 * 6370 ) ) * ( $dist * ( $terrain_len - $dist ) ) ) / ( 4 / 3 )

Where $dist is the distance from the beginning of the profile, and $terrain_len is the total length of the profile.

3) Also in the terrain path profile, I'm a bit concerned that I am oversimplifying the geometry. I'm just applying the earth bulge formula to the terrain path profile and that's it. Does anyone think it makes a significant difference whether or not I factor in the full geometry at the transmit and receive ends, or is this good enough?

Tuesday, July 9 2019

FCC Database Conversion and Site Usage Questions

While I moved most of the underlying FCC database-driven things on RabbitEars from CDBS to LMS about a year and a half ago, the CDBS facility table had remained in place rather than the new LMS facility table. That has now been remedied. It's not 100% finished, as particularly the Network Grid and the Statistics pages need a lot of work that I've yet to do. I'd say I'm more than 80% there, across the board, on the move to LMS. Some things definitely need some more polish, and if you come across something that doesn't work properly, please either comment here or e-mail me with a link to the page in question and a brief description of what's wrong. (I'm aware of the problem with the TSID page, just haven't done anything about it yet.)

I'm also working toward a new TVFool-like search function. I've shown a few people a new map-driven search page, and after some thought, I've decided to rewrite the actual search code as well, in an effort to speed it up. I don't know how long this will take, but I have the basic code design figured out, and it should help. I just need to implement it, which is of course the hard part.

On a semi-related note, are there people who use the Statistics page, or the various Advanced pages? I'm trying to figure out if there are things I can discontinue, as some of the maintenance is pretty hard on some of these things, and I don't really use them. So if nobody else does... (For the record, I am definitely keeping the Network Grid, just that it needs a complete overhaul as it is one of the slowest pages on the site. I want to do a complete overhaul and upgrade at once rather than upgrade it and then overhaul it.)

Thursday, July 4 2019

Arizona TV Station Update - June 2019

The Arizona TV Station Update covers news about TV stations viewable in my home state of Arizona. I claim no rights to the format, so if anyone wishes to report news about other regions, please contact the webmaster.

As always, questions, additions, comments and corrections welcome.

New Licenses

  • KEJR-LD 40.x Phoenix (HC2 Station Group Inc.) has requested a license to cover its displacement construction permit and to change towers within the South Mountain antenna farm. Technical specifications: Ch 32; TL 33° 19' 57" N, 112° 3' 59" W (South Mountain); ERP 15 kW directional (1° electrical beam tilt); HAAT 471 m.
  • KTVP-LD 23.x Phoenix (HC2 LPTV Holdings Inc.) has requested a license to cover its displacement construction permit and to change towers within the South Mountain antenna farm. Technical specifications: Ch 23; TL 33° 19' 57" N, 112° 3' 59" W (South Mountain); ERP 15 kW directional (1° electrical beam tilt); HAAT 471 m.

Continue reading...

Monday, June 10 2019

Arizona TV Station Update - May 2019

As always, questions, additions, comments and corrections welcome.

New Licenses

  • KFPB-LD 50.x (25) Globe (Globe LPTV LLC) has been granted a license to cover its displacement construction permit. Technical specifications: Ch 25; TL 33° 19' 57" N, 112° 4' 0" W (South Mountain); ERP 5.5 kW directional (2.5° electrical beam tilt); HAAT 480 m.

Continue reading...

Thursday, May 2 2019

Arizona TV Station Update - April 2019

As always, questions, additions, comments and corrections welcome.

New Licenses

  • KVPA-LD 42.x (34) Phoenix (KRCA License LLC, Debtor-in-Possession) requested and has been granted a license to cover its construction permit to vacate the 600 MHz band. Technical specifications: Ch 34; TL 33° 19' 57" N, 112° 4' 0" W (South Mtn.); ERP 15 kW directional (2° electrical beam tilt); HAAT 465 m.
  • K38GR-D 15.x Meadview (Mohave County Board of Supervisors) requested and has been granted a license to cover its construction permit to vacate the 600 MHz band. Technical specifications: Ch 21; TL 35° 51' 48" N, 114° 5' 48" W (Patterson Slope); ERP 1.05 kW directional; HAAT 218 m.

Continue reading...

Monday, April 8 2019

Arizona TV Station Update - March 2019

As always, questions, additions, comments and corrections welcome.

New Licenses

  • KASW 61.x (27) Phoenix (Nexstar Broadcasting Inc.) has been granted a license to cover its final post-repack facilities. Technical specifications: Ch 27; TL 33° 20' 1" N, 112° 3' 47" W (South Mtn.); ERP 445 kW directional (0.95° electrical beam tilt); HAAT 551 m.]
  • K39FY Zuni NM (Nexstar Broadcasting Inc.) has requested a license to cover its transition to digital on RF channel 26. Its new call sign will be K26OV-D. Technical specifications: Ch 26; TL 35° 6' 50" N, 108° 44' 8" W (E of Zuni Pueblo NM); ERP 0.83 kW directional; HAAT 94 m.

Continue reading...

Saturday, March 2 2019

Arizona TV Station Update - February 2019

As always, questions, additions, comments and corrections welcome.

With Repack Phase 2 well underway, things have become very quiet in Arizona and surrounding communities in California, Nevada, Utah and New Mexico.

Programming Changes

  • K36NE-D 43.x Las Vegas NV (HC2 Station Group Inc.) has once again added channels 43.2 and 43.3, but instead of Seventh-Day Adventist programming provided by the station's previous owner, these subchannels now offer infomercials and shopping. Channel 43.2 is now OnTV4U.

Continue reading...

- page 2 of 32 -