The most common and most likely answer to this crossword clue is the 7 letter word UPLINKS
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The straight part
We know that "transmitters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case transmitters = uplinks.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does UPLINKS mean?
UPLINKS noun- The portion of a communications link used for the transmission of signals from an Earth terminal to a satellite or to an airborne platform. An uplink is the converse of a downlink. An uplink or downlink is distinguished from reverse link or forward link.
- (by analogy, less formally) The communication path from a mobile device to a base station, a consumer to the network backbone, a client device to a server etc.
- Data transmission from a data station to the headend.
- To transmit a signal by means of an uplink.