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What does "FXO" mean relative to the type of station listed?

Thanks!

http://www.fcc.gov/Bureaus/Wireless/Pub ... 92205c.pdf

"Fixed operational", not that it helps.

Flash is correct -- but what does it mean?? Most often a remote station used to relay or to control another station --. A link channel. Might relay the Mobile voice communications (ie: 155.25 ) back to the base station at the dispatch center from a hilltop ( 453.4375 FXO ) . Or a control station ( 458.1125 FXO ) to control a remote base station on a hilltop ( 155.25 B + M) FXO stations always use a very directional antenna -- and trying to recieve the "link" channels are not always possible --.

MTM is correct, . . . FXO transmitters are many times used for "directional" uplinks or downlinks, . . . data or voice.

They have also been used in place of a leased telco line (remote control) circuit up to a hilltop, where a microwave shot was too expensive, or to avoid monthly leased telco line fees.

If you're located within the path of a directional FXO transmitter then you could very well also hear the conversation audio - as well as the remote transmitter operation function or guard tones.

Similar practices have been done with a 1 watt UHF pair, using yagis, but those configurations are usually licensed as a "MO" (mobile) because in most cases they are well below the the 6 meter tower elevation rule. In such cases, you'll need to listen on both frequencies to hear both sides of the conversation.

While we're on that, what is the 6 meter rule? I see it all the time in ULS for repeater sites.

The "6 meter rule" or "20 foot rule" refers to an antenna on top of a building or other structure but not an antenna tower). If the top of the antenna is less than 20 feet (or 6 meters) above the roof, it does not require an FCC license for the antenna, only the "mobile radio" that is transmitting. Antenna height for a "stick" type antenna is always measured at the top of the antenna, not at the base.

Wiz