I do not know if Aldena have an agent in the USA, but they have a good crossed LP antenna for this:

https://www.aldena.it/index.php/compone ... 2-91x.html

...Another question is why was there no pressure monitor on each transmission line along with a run monitor on the pressurization system. If I lost pressure on a large transmission line I would shut down the transmitter. It must be top of the list of replacement items... Looks like between ATC and ...

Of course ,we do not celebrate it here, but best wishes for Thanksgiving everyone!

kkiddkkidd wrote: ↑

Thu Nov 22, 2018 8:57 am

I had also incorrectly assumed that the radome material wasn't flammable but I guess it at least WAS moreso than I imagined.

I was surprised to read that too. The radomes I see are invariably fibreglass and do not burn.

Failure of a single antenna in a 32 antenna system may not have have caused enough of a VSWR fault to cause a shut down anyway. Apart from that, VSWR protection may not be fast enough to detect arcing anyway.

There are lots of things that can cause problems like this. Answering your question though, panel antenna systems will have a small frequency dependent variation, but it should not be significant. Unless that is you have an intended null in the pattern to protect another station. Variations in that ...

Makes a case for a split feed to the panels. Most master antenna systems I've been involved with have a line to the top half and a line to the bottom half that can isolated in case of a failure. ...Lee The photos do show a dual feeder arrangement for this system. With the amount of damage that woul...

No VSWR shutdown? Depends on what type of combining system is in use. In a balanced combiner system the TX won't see any VSWR mismatch coming from the antenna. I've always wondered why it's not common practice to monitor the VSWR of the combined output, where antenna faults can be detected and tran...

It is hard to imagine the failure mode that could have caused all that damage to every panel. It's a lot of RF and on 6 channels, so lots of volts too. Maybe a VSWR issue causing voltage breakdown at the antennas? Some clear photos here: https://www.radioworld.com/news-and-business/tower-fire-disrup...

An old saying: Google is your friend, or in this case Bing. A search for the power supply part number finds this manual: http://3-mtr.info/manuals/RVR/TEX30LCD/M2TEX30LCD28NS.pdf The TEX30 has the same PSU and has the circuit diagrams you need. For safety, check R4 first and make sure there is no vo...

The circuit diagrams for the supply are not in the manual. There is a good chance that RVR will not even have them. In additions to the checks mentioned earlier, look for a high value resistor on the primary side of the supply. It will be connected to the unregulated DC supply capacitor and provides...

The delay needs to be kept within microseconds. The article I mentioned earlier is available here: https://www.waveart.it/leggi-news?id=51 . It is pretty good as they have understood what is needed well and have verified it with tests. To keep the modulation identical, they also say that the composi...

The synchronisation you need is very high, so you really would have to use something like GPS. The modulation needs to be identical at all sites and that is far from easy. An Italian manufacturer published some research on this quite recently. You also have to worry about the delay between the diffe...

There are a few things that can affect RBDS reception other than a weak signal or multipath. Most obviously the RBDS subcarrier level needs to be correct. That would typically around 3kHz. Too high is just as bad as too low. There are various mod monitors that can measure that directly. Then anythin...

Check the electrolytic caps in the PA unit, in particular C29 (82u/63V). If a 47u is fitted, change it. You can break the old one so that you do not have to remove the board.