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Most probably because you are using some sort of repeater-based radio system, and you are far from the repeater. Either that, or you are line-of-sight to the dispatcher, but the foreman is located somewhere that is blocked by obstructions.
Dispatcher radios are typically "base stations" that have a much higher output power than a portable radio you might carry on your belt. With more power and a more efficient antenna, it's possible for a dispatcher to reach radios in the field, but those radios may not be able to answer back to the dispatcher.
If there is a repeater system in use, then typically the radios transmit on one frequency and listen on another frequency separated by the "offset". In ham radio on the 2 meter band this is typically 600KHz....so my local repeater transmits on 147.16 and has a + offset, meaning that it listens on 147.76. My radio listens on 147.16, and when I press the transmit key it shifts up to 147.76. Every other radio that's listening hears the repeater on 147.16, but NOT me on 147.76. Unless of course they're close, and they change to the 147.76 frequency. Then they could hear me transmitting directly, instead of being relayed through the repeater.
At VHF and above, line-of-sight is very important. If there are mountains, buildings or other stuff in the way, the radio signal is blocked. This is why so many systems use repeaters; it can be on top of a mountain somewhere nearby, with a clear view of all the radio users in the valley below. VHF is somewhat less line-of-sight than UHF, but you still won't get much if you're behind a mountain. (Even a little one!)
Cell phones are very high frequency, but they get away with this by having lots of cell sites (repeaters) scattered all over the place, so there's almost always one within easy range. The cell sites negotiate among themselves to decide who handles your call, and when to hand it off to another site that has a better signal.
MGF
KC7LZD
What else can I help you with?
Comapritive study of voice modulation in radio and television?
importance of voice modulation in radio
Who does the voice of the radio in the Radio Shack commercial for HD radio?
Ludacris
Is there a portable voice translater?
Yes you can find them online, or at a library.
Is there a small portable hollow voice maker from Bleach?
Not yet unless you download audacity clips to your cellphone or portable device.
Does Stephen hawking communicate by voice synthesizer and a portable computer.?
yes
Do they tweek ferrgys voice on the radio?
Yes
Who does voice radio commercials USO?
DB Cooper
Who is the voice of the wachovia radio commercials?
Jon Cryer
How can you get on a commercial?
On Radio: be able to read word-perfectly and have the kind of voice commercials want. Get well known for your acting ability and become a voice-over artist. On TV: Voice-over: as for Radio. You in video: become a celebrity.
I can't remember a song that has the word radio in it its sung by a man with a really deep voice and its old can anybody help me?
That's a pretty vague clue. In the song MEXICAN RADIO, he sort of drops his voice down on "radio." ... "I'm on a Mexican (whoa-oh) Radio...."
Who is the female voice in the lazy boy radio commercials?
Lecia Macryn is the voice on the Lazy Boy commercials.
Who does the voice over on the front of the Matt Edmondson radio 1 show?
Annoyingly, he does his own voice overs.
