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Motorola APX 2000 VHF TX on two different frequencies???

Catraska

Member
Joined
Jun 27, 2020
Messages
12
Could anyone tell me why an APX 2000 VHF transmits on two frequencies simultaneously when I press the PTT?

I know this because I have a BCD436HP scanner, and when I use the "close call" function, it detects transmission on 136.000 MHz and 408.000 MHz...¿¿¿simultaneously???.

I'm really confused because I'm just getting to know and learn about the APX line. I haven't received the programming cable yet, and I've also been thinking that the radio has some defect.

I'd appreciate your comments.

Kind regards
 

KevinC

Encryption
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Jan 7, 2001
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13,658
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I'm everywhere Focker!
Could anyone tell me why an APX 2000 VHF transmits on two frequencies simultaneously when I press the PTT?

I know this because I have a BCD436HP scanner, and when I use the "close call" function, it detects transmission on 136.000 MHz and 408.000 MHz...¿¿¿simultaneously???.

I'm really confused because I'm just getting to know and learn about the APX line. I haven't received the programming cable yet, and I've also been thinking that the radio has some defect.

I'd appreciate your comments.

Kind regards
It doesn’t. Separating the two devices will make the phantom frequency disappear. You are overloading your scanner.
 

WB5UOM

Active Member
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Sep 5, 2022
Messages
557
its how rf works...that is the 3rd harmonic. 136.000 x 3= 408.000
probably could hear it on 272.00 as well... now Class, what harmonic would 272.000 be?
 

WB5UOM

Active Member
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557
Maybe its time for a test session on newer radios to see who is putting out the highest 2nd and 3rd harmonics these days
 

Catraska

Member
Joined
Jun 27, 2020
Messages
12
OMG...
its how rf works...that is the 3rd harmonic. 136.000 x 3= 408.000
probably could hear it on 272.00 as well... now Class, what harmonic would 272.000 be?

OMG....
I didn't know that, but yes, it is indeed possible to hear on 272,000MHz as well... I checked it with other radios as well, and the same thing happens, so I conclude it's some RF theory I wasn't aware of, not a radio defect.

Thank you very much for your comments and help.

Best regards
 
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