Batboard

I read on an older post here that a UHF Jedi should be set to low power [2 watts] for use in a UHF Jedi MTVA to put out the rated 25 watts. Would having the Jedi putting out 4 watts overdrive or damage the amp? What power setting should be used to work correctly? 2 or 4 watts? Pt # NTN 1324A, option Q149AA. Also there doesn't seem to be a 403-470, or 450 512 mhz unit. Just 1 UHF controller/amp. Would this unit work well for 440-470 coverage? Thanks. GARY N4KVE

Good chance you'll be overdriving the amp with 4 watts, magical smoke will come about eventually.

http://batboard.batlabs.com/viewtopic.php?f=1&t=62747

Thanks. That's actually the post I was referring to. Just wondering if anyone could confirm this. I mean how many cop radios are going to have a switch for hi/low power, & does anyone think a cop would remember to set his radio to low power when he inserts his radio into the MTVA? It's also strange that the post says to use 800, & 900 mhz on hi power, but VHF, & UHF on low power? This is why I asked. Seems strange. GARY N4KVE

When the radio is put into the MTVA, it *should* switch to low power automatically, I believe... There are diodes in the mtva that go across the mode select lines on the jedi accessory connector, and there's a specific combination of diodes that tell the radio, "Hey, you're in an MTVA!" and I believe part of the MTVA mode is to turn down power!

Can anyone confirm this?

An easy way to confirm would be to terminate the input/output of the amp, and hook the rf output of the cradle to a wattmeter+dummy load or service monitor, and see what the output level is from the cradle.

I would bet that the mode select options may vary depending on the control unit used.. With the barefoot control unit, you might want high power available on the radio.

Unfortunately, my MTVA manual is currently in storage.

maxkelley_kc2spy wrote:When the radio is put into the MTVA, it *should* switch to low power automatically, I believe... There are diodes in the mtva that go across the mode select lines on the jedi accessory connector, and there's a specific combination of diodes that tell the radio, "Hey, you're in an MTVA!" and I believe part of the MTVA mode is to turn down power!

Can anyone confirm this?

I looked over the MTVA installation manual ( 68P81075C90-A ) and the MTVA Users Guide ( 68P81075C85-A )
and am not able to confirm this. The MTS2000 CPS does have a check box to turn on the display back light when
inserted in the MTVA but that is all I could find. Not sure, but I think the channel personality would have to have
the low power option checked and that low power level would have to be set up in the tuner app.