link to: Narrowbanding the 720/820
*All TKR-720/820 models may not be repeaters, even though the model plate says \”TKR-720\” or \”TKR-820\”.
Inside the 720/820 is a single circuit board that is the factory repeater controller; it\’s called the \”Signalling Unit\”. Sometimes it is missing.
See the GIF below to determine if your 720/820 has this board or not. If not, I don\’t have any boards that I can sell.
Note: you can still use these 720/820s (that are missing the Signalling Unit board) as a repeater by utilizing an external repeater controller. I can still reprogram and realign a \”Sig-Unit missing\” 720/820 for you, but won\’t be able to assist in the interfacing of an external controller; that aspect is all up to you.
Below are the factory intended frequency ranges of the various models that were sold by Kenwood.
TKR-720 150-174mhz: K,M,NM,AM (aka Type -1)
TKR-720 136-150mhz: K2, M2, NM2, AM2 (aka Type -2)
TKR-820 450-470mhz: K, M, NK, NM, AM (aka Type -1)
TKR-820 470-490mhz: K2, M2, NK2 (aka Type -2)
TKR-820 490-512mhz: K3, NK3 (aka Type -3)
TKR-820 490-520mhz: M3
TKR-820 406-430mhz: K4, NK4 (aka Type -4)
TKR-820 400-430mhz: M4, NM4, AM4
Easiest method of identification is to look at the ID plate on the repeater, and the FCC Compliance number (not the model number); this is where you\’ll see the \”-1, -2, -3, -4\”
Q and A* \”I have a TKR-720/820 base station model, has a single digit channel display on the front panel\”.
If you look closely at the model number plate, it should say \”TKB-720 or 820\”. Although some of these came from the factory with the Signalling Unit board installed, I personally won\’t work on them…. every one I tried had something peculiar with it causing strange repeater behavior.
link to:
Narrowbanding the 720/820