Mattguy
Member
I just purchased two lmr400 2 ft cables for my repeater to duplexer connections. Is this ok to use or overkill? I looked up Motorola part numbers for there cables on my account and they are about $160.
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Mototrbo Repeater Cables XPR8300
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Project25_MASTR
Millennial Graying OBT Guy
Generally speaking, you don't run LMR400 for repeater use. Never played with it for duplexers. Generally you run double shielded RG142/RG400 (RG58 sized) or RG214/RG393 (RG8 sized) feed line with silver plated connectors on jumpers in odd quarter wave lengths to the frequency of operation. Some run hard line, but the general consensus is that the dissimilar metal shielding in LMR400 can create noise though I don't know if it is noticeable in digital communications.
Mattguy
Member
Thank you for information. On my Motorola GR1225 the repeater to duplexer cables were very tiny. But when I went to find cables for my XPR8300 it has a BNC connector for receive and N for transmit, so I could not use the same cables as the GR1225 as it has mini uhf.
Project25_MASTR
Millennial Graying OBT Guy
Motorola has traditionally shipped RG58 for jumpers with GR series repeaters. It was always an upgrade to upgrade to RG142/RG400 which is physically the same size as RG58. Where 58 has a 80% or less coverage with the braid, the 142/400 options have an extra braid to provide 98% coverage.
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Mattguy
Member
Will there be sizable loss with the lmr400 compared to RG400 jumpers to duplexer?
The loss in those short lengths would be hard to measure. You would not be able to detect it.
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