In The Beginning, there was SIMPLEX A B

Simplex and Duplex When two stations contact each other using the same frequency for both transmit and receive, they are said to be operating simplex.

And Then There Were Mountains and People Moved Farther Apart A B

Enter Repeaters A B

Note the repeater output frequency,

A repeater is an electronic device that “listens” to radio transmissions on one frequency and re-transmits the same information on a different frequency.

A radio repeater is a combination of a radio receiver and a radio transmitter that receives a weak or low-level signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. Wikipedia.

When using repeaters, all of the radios transmit on one frequency ( ) And receive on a different frequency ( ).

The repeater acts like an intermediary or translator. The individual radios cannot communicate with each other without the repeater. No repeater = no duplex communications

Simplex and Duplex Duplex operation is where one station transmits on frequency A and receives on frequency B while the repeater transmits on frequency B and receives on frequency A.

Greater Range A repeater’s expanded coverage greatly enhances the ability to communicate with mobile stations and hams using hand held transceivers.

Damaged Repeater = No Duplex Communications A B (repeater output fx.)

Damaged Repeater = Simplex Communications A B C Simplex Only

ACS normally uses the WA6GG repeater. That repeater transmits on (the repeater output fx.) if you look at your radios, you will see that fx displayed. That is your radio’s input or receive fx. The WA6GG repeater receives on When you key your microphone, the fx on your radio changes to Your radio’s transmit fx is the repeater’s receive fx.

Damaged Repeater – Use Simplex A B C Simplex Only

Damaged Repeater – Use Simplex A B C Simplex Only D E