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Motorola XTVA Convertacom w/RF Amplifier

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chief21

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Hello Motorola Experts...

I recently picked up an XTVA and it came with an external, TPL-branded VHF RF power amplifier. From what I've read, it seems that this 3rd-party amplifier might have been supplied by Motorola with the original purchase - many years prior to the LMR narrow-banding mandate. Before I put this power amp in-line, I'm wondering if it will work properly with both LMR (narrowFM) and amateur (standardFM) channels. Can anyone advise?
 

RFI-EMI-GUY

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Hello Motorola Experts...

I recently picked up an XTVA and it came with an external, TPL-branded VHF RF power amplifier. From what I've read, it seems that this 3rd-party amplifier might have been supplied by Motorola with the original purchase - many years prior to the LMR narrow-banding mandate. Before I put this power amp in-line, I'm wondering if it will work properly with both LMR (narrowFM) and amateur (standardFM) channels. Can anyone advise?

The narrowbanding of FM should have no effect on your amplifier either way. It should work fine provided you are operating in the proper frequency range for the amplifier. You might look up the amplifier model number to see if it is in range or some tuning or rework is needed.

You cannot use most aftermarket LMR amplifiers with TDMA like you would encounter in MotoTrbo or Hytera DMR or with APCO-25 phase 2. The amplifier cannot switch fast enough from transmit to receive to syncronize the TDMA packets. There are some Chinese amplifiers that claim to operate DMR, but as with all things from China, you get what you pay for and important facts are conveniently lost in translation.
 

N4KVE

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While the ser # decal might say frequency range 136-174 MHz, there will be an adhesive paper sticker showing what exact freq it was tuned to. I had a 100 watt TPL amp that was tuned To 457 MHz, but I transmitted at 447 MHz, so I got 85 watt. That was enough, so I didn’t bother trying to find someone to retune it.
 
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