GSM sing along getting retransmitted by satellite. (1 Viewer)

Register Today to see less ads! It's Free!
Status
Please reply by conversation.
Register Today to see less ads! It's Free!

lost_mesa

SatelliteGuys Pro
Oct 18, 2010
540
447
New Mexico
Interesting article and a nice bit of detective work.

I came across something similar back in the 90s, some FM radio stations that I believed were unintentionally getting into the uplinks on two satellites.

I used to listen to analog single channel per carrier radio feeds via satellite. Tuning around on Ku band, I came across two groups of terrestrial FM radio stations. One I think was from Baltimore, and the other was from Portland, Oregon.

There were about 5 FM radio stations from Portland. It was frustrating listening to them though, because over a period of an hour or so, they would individually varied all over in signal strength, from full quieting to almost unreceivable. There were 3 things I noticed about these signals:

The frequency spacing between the stations on the satellite downlink was the same as on the FM broadcast band.

They were in multiplex stereo, which wasn't normally used on satellite SCPC signals.

The 5 FM stations in Portland were all co-located at the same transmitter site.

I guessed that these stations were getting into the block up converter of a nearby uplink and getting heterodyned to the uplink frequency. They were around for quite a few months. I was kind of surprised it lasted that long.
 
  • Like
Reactions: olliec420
Register Today to see less ads! It's Free!
Register Today to see less ads! It's Free!
Status
Please reply by conversation.

Users who are viewing this thread

Users Who Are Viewing This Thread (Total: 0, Members: 0, Guests: 0)

Latest posts

Top