EF Johnson Challenger Series Information

EF Johnson Series Radio Information

these are very versatile radios, they will easily move into the ham bands VHF and UHF models. The logic boards can be swapped between models and reprogrammed so that you can make a 2 Channel VHF a 99 channel by just replacing the logic board and reprogramming. The boards between UHF and VHF are fully interchangeable. I have also converted non-remote models to remote and vice versa. Converting Dash Mount EF Johnson Challenger Radios to Remote Mount

Model Number Decoding

Challenger series radios have the following part numbers. They are in the form:

242-MMMM-TBA

242 = For the Challenger Series line

MMMM = Model Number (see below)

T = Radio Type

B = Frequency Band

A = Accessories / Programming

Models

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:

71x1

2 Channel

25 watts (VHF)

15 watts (UHF)

71x2

8 Channel

25 watts (VHF)

15 watts (UHF)

71x3

2 Channel

40 watts (VHF)

35 watts (UHF)

71x4

8 Channel

40 watts (VHF)

35 watts (UHF)

71x5

20 Channel

40 watts (VHF)

35 watts (UHF)

71x6

99 Channel

40 watts (VHF)

35 watts (UHF)

71x7

99 Channel

100 watts (VHF)

80 watts (UHF)

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

7151

Band: VHF

Channels: 2 Channel

Output: 25 Watts

7152

Band: VHF

Channels: 8 Channel

Output: 25 Watts

7153

Band: VHF

Channels: 2 Channel

Output: 40 Watts

7154

Band: VHF

Channels: 8 Channel

Output: 40 Watts

7155

Band: VHF

Channels: 20 Channel

Output: 40 Watts

7156

Band: VHF

Channels: 99 Channel

Output: 40 Watts

7157

Band: VHF

Channels: 99 Channel

Output: 100 Watts

7161

Band: VHF

Channels: 2 Channel

Output: 25 Watts

7162

Band: VHF

Channels: 8 Channel

Output: 25 Watts

7163

Band: VHF

Channels: 2 Channel

Output: 40 Watts

7164

Band: VHF

Channels: 8 Channel

Output: 40 Watts

7165

Band: VHF

Channels: 20 Channel

Output: 40 Watts

7166

Band: VHF

Channels: 99 Channel

Output: 40 Watts

7167

Band: VHF

Channels: 99 Channel

Output: 100 Watts

7171

Band: UHF

Channels: 2 Channel

Output: 15 Watts

7172

Band: UHF

Channels: 8 Channel

Output: 15 Watts

7173

Band: UHF

Channels: 2 Channel

Output: 35 Watts

7174

Band: UHF

Channels: 8 Channel

Output: 35 Watts

7175

Band: UHF

Channels: 20 Channel

Output: 35 Watts

7176

Band: UHF

Channels: 99 Channel

Output: 35 Watts

7177

Band: UHF

Channels: 99 Channel

Output: 80 Watts

7181

Band: UHF

Channels: 2 Channel

Output: 15 Watts

7182

Band: UHF

Channels: 8 Channel

Output: 15 Watts

7183

Band: UHF

Channels: 2 Channel

Output: 35 Watts

7184

Band: UHF

Channels: 8 Channel

Output: 35 Watts

7185

Band: UHF

Channels: 20 Channel

Output: 35 Watts

7186

Band: UHF

Channels: 99 Channel

Output: 35 Watts

7187

Band: UHF

Channels: 99 Channel

Output: 80 Watts

Radio Type

0 = Standard Front Mount

1 = Standard Remote Mount

Frequency Band

1 = 403 - 430 mHz

2 = 450 - 488 mHz

3 = 488 - 512 mHz

Accessories / Programming

0-9 = Additional accessories

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.

• 

  UHF Cover Plate

• 

  VHF Cover Plate

Power output of the radio can be determined by the size of the rear heatsink. the max power is also determined by the band (UHF/VHF)

• 

  UHF-80 Watts / VHF-110 Watts

• 

  UHF-35 Watts / VHF-40 Watts

• 

  UHF-15 Watts / VHF-25 Watts

Determining the number of Channels

(I'm missing an 8 channel image, but its easy, it only has one digit)

• 

  2 Channel Non-remote

• 

  20 or 99 Channel Non-remote

• 

  99 Channel Remote