| WALKIETALKIE | A portable radio transmitter and receiver allowing for two-way communication (6,6) |
| MALAYALAM | Language for two-way communication? (9) |
| TRANSISTOR | I refuse to train sister, say, on a portable radio (10) |
| INTERCOM | Device for two-way talking |
| TRANSMISSION | A type of wire or line that carries radio waves from the radio transmitter to the antenna. (12) |
| RIG | A costume or outfit; a CB transmitter and receiver; or, a boat's distinctive configuration of masts, sails, tackling etc (3) |
| BRIG | British transmitter and receiver found in two-masted sailing vessel (4) |
| INTERACTIVE | Allowing two-way communication between a computer and user (11) |
| TALKBACK | A system of two-way communication by loudspeaker (8) |
| TELEX | Name a once popular two-way communications system (5) |
| RADIO | Two-way communication device |
| PAGER | "One- monologue" or two- way communication device |
| MAST | A tall pole on land, especially a TV or radio transmitter (4) |
| SIGN | Unique identifier for a radio transmitter or aircraft (4,4) |
| CALL | Unique identifier for a radio transmitter or aircraft (4,4) |
| BEACON | You'll find this radio transmitter on the road between Troon and Camborne (6) |
| FOB | Key part that's also a short-range radio transmitter |
| OLFACTORYNERVES | A pair of transmitters and convertor safely relocated (9,6) |
| TVSET | Household screen-and-receiver combo that may have an antenna: 2 wds., 1 abbr. |
| OVER | End of a one-way communication |
