56
XLi IEEE 1588 Clock
997-01510-03, Rev. C, 12/12/2006
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1
59 GPS antenna cable supplied with the XLi. If the GPS antenna is connected using a different antenna
length, calculate the new value using the multiple given below and adjust the value of F51. If using an
optional Down/Up Converter, consult that product’s documentation for directions on setting the correct
cable delay.
F51 Guidelines:
•
For RG-59: multiply the cable length by 1.24 ns/ft. to get the value for F51.
•
For RG-58: multiply the cable length by 1.4 ns/ft. to get the value for F51.
•
Don’t use function F51 to adjust the XLi’s
timing outputs
; use F52 Distribution Cable Delay
instead.
Command Line
Use the following format to display the current Antenna Cable Delay setting:
F51<S>B<N><CR>
The XLi responds using the following format:
F51<S>B<N><SEP><SIGN><DELAY>ns<CR><LF>
where:
For example, to see the antenna cable delay for the GPS card in option bay 4, enter:
F51 B4<CR>
XLi responds:
F51 B4 +000060ns<CR><LF>
F
= ASCII character F (f or F for input string).
51
= the
function
number.
<S>
= ASCII space character one or more.
B
= ASCII letter to denote Option Bay number follows
<N>
= Option Bay Number of the GPS option card, 1 through 4.
<CR>
= carriage return character.
<SEP>
= one or more space characters.
<SIGN>
= or blank
<DELAY>
= 1 to 6 digit delay from 0 ns to 999999 ns.
ns
= nanoseconds (ns or NS for input string).
<LF>
= line feed character.