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VX-4000 tuning issue

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Database Admin
Feb 19, 2003
N.E. Kansas
What the heck is up with this? We are narrowbanding our radios and every other radio in the fleet is fine except the VX4000Vs. You simply select 12.5 narrow and reprogram. The VX4000V's are emitting a PL whine narrow mode. I assume the PL deviation is off the charts for some reason. In wide band they are fine. I contacted Vertex and they sent me the SVC49 tuning software and manual. Apparently you need an FIF-8 firmware writer? Whaaaat?

This is insane. Does anyone know of any other method to simply adjust the deviation? Do I have to actually have all this extra equipment to do a simple bit of normal tuning?



Premium Subscriber
Sep 15, 2009
I know the problem that you are having, but you do have to have the firmware writer (FIF-8a) with the db-25 cable (CT-88) and SVC-49 software to perform any alignment for the the vx-4000, 5500, or 6000 radios.

You could see if there is a Vertex dealer near you that could do the alinement for you for less than the FIF-8 (List $188) and cable (List $55) would cost you.
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