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Coupled reference signals
When using a coupled reference, the reference
phase-lock power level can be determined by sub-
tracting the cable insertion losses and the coupling
factor of the directional coupler and adding ampli-
fier gain, if any, to the output power of the trans-
mit source. Insertion loss curves for 85381 series
cables are shown in Figures 12 and 13.
If a coupled reference is used, the A5 cable can
be connected directly to the reference input of
the 8511A/B.
26
Record the calculated value in Figure 19. If the
power level is insufficient, increasing the transmit
power and/or decreasing the coupling factor of the
directional coupler may provide the additional
power required.
GPIB cables
A GPIB cable between the 8530A and the 8511A/B
is required only if Option 001 (IF switching) is
installed in the 8511A/B. In this case, the maxi-
mum separation distance between the 8530A and
the 8511A/B is 12 meters (40 feet).
GPIB extenders are used to facilitate communica-
tion between the 8530A and the transmit source.
37204A GPIB extenders can support distances of
up to 250 meters (820 feet) using 75-ohm coaxial
cable and up to 2,500 meters (8,200 feet) using
37204A Option 013 and fiber-optic cable.
22
For extremely long ranges, telephone line modems
can be used in conjunction with a leased telephone
line to provide communications between the trans-
mit site and the receive site.
When configuring systems with a telephone line
link to the RF source, Agilent recommends an ICS
Electronics IEEE-488 to RS-232 converter and a
Hayes Smartmodem 9600 telephone line modem at
each end of the telephone line. For more informa-
tion on these products, contact the manufacturers:
ICS Electronics model 4886B-H
(408) 263-5500
www.icselect.com
Hayes Smartmodem 9600
Hayes Microcomputer Products, Inc.
(770) 441-1617
www.hayes.com
GPIB extenders
GPIB extenders are also used when remoting the
LO source with the 85309A LO/IF unit. 37204A
GPIB extenders can be used for this purpose. If the
37204A is also used for communications with the
transmit source, only three extenders are required.
Extenders must be used in slow mode.
The cable type must be the same between all
three extenders.
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