Stage 1 of 6
LEARN
Simplex, from the last lab, is two radios on one frequency. A ridge can block that path. A repeater is a station on higher ground that hears one radio and sends the signal on.
Labs · 03
Repeaters
Repeater input/output frequencies, offsets, tones, range, and basic repeater operation.
NOT STARTED
Lab workspace
Work through the six stages. Try the controls. Nothing here receives or transmits a real radio signal.
Stage 2 of 6
SEE IT
The repeater listens on one frequency and transmits on another. Your radio listens where the repeater transmits. The difference is the offset. A tone may be required before the repeater responds. The tone is not privacy.
Stage 3 of 6
DO IT
Use this listing: output 146.940 MHz, offset minus 600 kHz, access tone 100.0 Hz. The sign comes from the listing. A 600 kHz step is common on 2 meters. It is not a rule for every band.
Stage 4 of 6
EXPLAIN IT
Why does a repeater use two frequencies instead of simply having everyone transmit and receive on exactly the same frequency at the same time?
Stage 5 of 6
EXAM CONNECTION
RADIO LAB PRACTICE. These questions are about the repeater picture and the listing you just used. They are not official exam questions.
Stage 6 of 6
FIELD TASK
You are on one side of a ridge. Another operator is beyond it, and simplex is unreliable. A nearby repeater listing says output 147.060 MHz, offset plus 600 kHz, access tone 123.0 Hz. Use the repeater path and set the radio side of that listing.