EF Johnson Challenger Series Information

EF Johnson Series Radio Model number Information

In a posting on the EFJ yahoogroup a gentleman reported that the model numbers in the 71xx series of Challengers were organized such that: The VHF units were 715x and 716x (the 5x were 1st generation and 6x were 2nd generation)

The UHF units were 717x and 718x (the 7x were 1st generation and 8x were 2nd generation)

The following numbers replace the x as mentioned above:

1 = 2 Channel 25 watts (VHF) 15 watts (UHF)

2 = 8 Channel 25 watts (VHF) 15 watts (UHF)

3 = 2 Channel 40 watts (VHF) 35 watts (UHF)

4 = 8 Channel 40 watts (VHF) 35 watts (UHF)

5 = 20 Channel 40 watts (VHF) 35 watts (UHF)

6 = 99 Channel 40 watts (VHF) 35 watts (UHF)

7 = 99 Channel 100 watts (VHF) 80 watts (UHF)

If it had a -5 after the number it was a remote mount system

Radio Identification by Images

you can easily identify the band of the radio by looking at the inside. the UHF has two small cover plates the the VHF has on large one.