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tk790 help

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Purplegoat88

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I have a tk790 and I programmed it myself. im trying to figure eout what the problem is. it seems like im receiving another town on my fire freq. im using it mostly for listening while responding so I disconnected the mic from the mic cable. I enabled off hook scan. do I need to check off hook decode as well? if what im reading is correct then without the mic connected it disables the pl. any input here?
 

mmckenna

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Sounds like it.

It's pretty common for radios like this to be set up this way. The PL/CTCSS decode is defeated when the mic is off the hook, this forces radio users to "monitor" the frequency when they take the microphone off the hook. This prevents interfering with other users on the same frequency. The mic hook circuit uses the button on the back of the microphone and the metal clip. By disconnecting the microphone from the radio, you've made it think the mic is off the hook.

The programming software will let you change this. Off Hook Decode is what you want. Either that, or just reconnect the microphone.
 

Purplegoat88

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Are you saying there's a button that senses when the mic is out of the mic holder? And if so wouldn't I need to have the mic in a holder for it to see it as "on hook" I'm a bit of a novice when it comes to programming.
 

Purplegoat88

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Also it likes to beep randomly while scanning. And not all the time. Only sometimes. I don't understand why
 

mmckenna

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Are you saying there's a button that senses when the mic is out of the mic holder? And if so wouldn't I need to have the mic in a holder for it to see it as "on hook" I'm a bit of a novice when it comes to programming.
Yep, sort of. The metal of the mic clip completes a circuit that tells the radio if the mic is off hook or not.


Also it likes to beep randomly while scanning. And not all the time. Only sometimes. I don't understand why
Could be "priority scan" is set. They can be set up to beep when the priority channel has traffic.
 
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