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Jan 16th, 2008 at 8:59pm
Read here https://www.njr.co.jp/e_frame/ef_05mc_02.html
The NJR2537 is an internal reference, phase lock loop PLL type.
The NJR2184 is a cheap DRO type.
The NJR2537 is a superior replacement, but if you are receiving a wide bandwidth QPSK outlink carrier, as is typical for a LinkStar system, you are unlikely to notice any difference.
The PLL type is needed when you are receiving a small carrier, such as SCPC, where the frequency error may mean you miss the carrier completely. Also, small carriers and carriers with 8-PSK or 16-QAM modulation are more sensitive to phase noise and benefit from PLL type LNBs.
Note that an external reference PLL LNB will not work unless the modem has a facility to send a 10 MHz reference up the LNB cable and has the reference turned on.
Best regards, Eric.
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