tweiss3 Posted February 14, 2022 Report Share Posted February 14, 2022 The thread here sparked an internal debate in my head. 47 CFR 95.1767(a)(1) states "The transmitter output power of mobile, repeater and base stations must not exceed 50 Watts." In the other thread, that version of the Bridgecom hardware provides 4dB of insertion loss before you even connect the antenna feed line, loosing 60% of your power right off the bat. In otherwords, before you eve get to feed line loss if you have 50W out of the repeater, you are down to 19W. Again, this further points to the importance of proper feed line choice and a great antenna (why skimp if you are already dropping $4k+ on a combiner). Even with hardline, you could only see 6.8W/10.7W/12.7W to the antenna with 1/2"/7/8"/1.25" on a halfway decent tower site (300'). Potentially, a manufacturer could potentially provide a 8U complete box with a single coaxial connector that puts out exactly 50W at that connector, but has all the combiner, transmitter & receiver in the single box, and if that enclosure package was tested and achieved the part 97 certification, would be acceptable for use for GMRS. The obvious would be that the transmitter would output higher than 50W to overcome the losses internal to the box, but since its "one piece" could potentially pass the transmitter based on that. This is slightly different from most repeaters, since the duplexer may have a spot in the case, the jumpers are exterior, and the rating is for the raw transmitter output before the duplexer. Now I have my opinion/interpretation, but I'd like to hear from others. Where is that power limit taken from and why? This is not to say that anyone would know/notice/care if you ran an amplifier to make exactly 50W come out of the duplexer or combiner. Not saying you should, but its not impossible, not that there are part 95 certified amplifiers available that could handle the duty cycle needed. WROZ250 1 Quote Link to comment Share on other sites More sharing options...
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