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RF Power adjustment CDM750

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fdnyfish

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I have purchased a few used CDM750's over the last 6 months for small projects. I run into the same problem on Low Power models as well as High power models.

I'm not getting the correct RF power when I test the power out on a meter, I have tried a few different meters and antennas.

Using a High power UHF CDM750 as an example AAM25RKC9AA1AN (see attached screenshots):

Radio Information - TX Power - Low=20 Hi=40

Radio Configuration - TX Power - Low=20 Hi=40

Conv Pers 1 - Options - TX Power Level=High

I only get about 25 watts out.

What am I missing here?
 

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mmckenna

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From the land of sky blue waters!
Ideally you want to use a 50Ω dummy load rated for the full output power of the radio to test. High swr can cause the radio to fold back on the power.

Also, making sure your power supply is up to snuff is a good idea.

You didn't mention what kind of power meter you are using?
 

RadioGuy7268

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Mar 11, 2006
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PA
1. Power supply of 13+ volts - under load while keying.

2. Check/change your jumper cable from the radio to your meter. Consider any adapters you are using as suspect.

If you keep having the low readings across different radios - it's almost got to be 1 of those 2 areas.
 
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