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TK-790 / 890 tone decode

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HummerMike

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Jul 22, 2015
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Abbeville, S.C.
I have a dual radio set up in my Hummer. A tk-790 and a tk-890 with a common head. My issue is that the local sheriff and police use a PL tone of 107.2. My Motorola xpr series radios decode this pl tone fine. I believe the deviation of the repeaters pl tone may be just below the level needed for the Kenwood to decode. I am going to replace the 890 (UHF) radio on my end and see if there is a difference. Other agencies that use 107.2 works fine. Just wondering if anyone else has experienced this.

Mike
 

ramal121

Lots and lots of watts
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Calif Whine Country
Are you narrow banded on these channels? A 790 or 890 should open up on very little deviation, say 100 to 150 Hz, even on wide. There is a bug in alignment where a newly narrow banded radio would not open for a tone QT at any level. Search this forum for squelch alignment and see if this applies. Other than that, frequency warp wayyyy out of alignment or maybe discriminator coil would reduce tone QT sensitivity.
 
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Jun 28, 2013
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Does the 890 decode ANY PL on another channel?

Refer to pages 74 in the attached manual to set the "QT" (PL, CTCSS) on the radio. It is advisable to go through the entire alignment procedure. There is no way to know what has been done to the radio before you got it. Hope this helps.

Chris
 

HummerMike

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Jul 22, 2015
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Location
Abbeville, S.C.
Update to my issue. Figured the squelch needed to be realigned. So, did a couple of things while at it. Added the KRK-8DBH to the radio decks so to have two decks with a front and back control head. Touched the VCO a bit on the UHF deck to get down to 441Mhz. Now it spans from 441Mhz to 469Mhz. Perfect for what I need.
Here's the kicker. Took both radios and mated with a single head to do the Test / Adjust mode portion. Supposed to be able to Turn radio on while holding the P0 button in. A small "N" should appear in the upper left side of screen. No matter what I did, it would not happen. Finally looked around in my version of the software and it will let you go into the test/adjust mode from the software. No need to do the way shown on You Tube. Realigned the squelch and is decoding the narrow band stations fine.

Mike
 
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