Miklor published a review on this BTECH amplifier. It is available on Amazon for $138. This is a single band only, specifically for 220-225 Mhz. 6 watts in is 39 out. Hand mike included.
Might be handy for those of you using our 220 DMR repeater on Baldi. Perfect for use with the TYT 220 HT. SMA-Male input, SO-239 output. K1 Mic support.
BTECH also makes UHF and VHF version.
UPDATE: It may be that DMR Tier II mode is not supported in the 220 version, research that or stick with the UHF/VHF versions if you want more power out of your handhelds.
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