skugger wrote:this thread is probably the best fit for the questions i have, regarding our HD transmitter. i'm a little hesitant to put this out there - my apologies to any unemployed or underemployed engineers out there - but i'm an IT guy whose been hired to do my usual IT duties, as well as to start working my way into the role of broadcast engineer as well. i have a bit of an electronics education, but this is still proving to be a challenge. i have no mentor to speak of.
we have a BE fmi1405 transmitter running in iboc-only mode, and it's broadcasting HD1, HD2, HD3, and HD4. right next to it in the shack is an aging analog transmitter putting out 100kw ERP on the same frequency. we're suffering from frequent and persistent signal dropouts on all four HDs, where signal losses will occur every few minutes & last 5 - 15 seconds each, on average. as you might imagine, we have HD receivers scattered all over the building here, 2.5 miles down the hill from the tower, & they all seem to drop out at different times. it's just as bad in my car, even when driving past the tower.
in my opinion, the dropouts got worse when we added HD4, and it's HD4 that seems to suffer from dropouts the most. we have a Belar HD monitor that i've recently gotten working again, so i have some actual data to look at & work with, i'm just not sure (yet) how to interpret it. when i look at the spectrum, it looks like the analog occasionally swells loud enough to overpower the HD sidebands.
i don't want to be an example of HD horror stories anymore if anyone has any thoughts, knows of a decent troubleshooting resource, or has other advice, i'm all ears!
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