LAPLACE INSTRUMENTS LTD
RF300
USER GUIDE
Page 10
8. The loops can now be adjusted for best shape and position. Generally the vertical
loops will tend to sag into the lower half of the antenna. These are held up in position
by using the tiewraps as shown in fig 8 on each corner post to take some on the weight
of the loop. The top of the vertical loops can be adjusted for best shape and the two
loops fastened together with the fifth tiewrap. With care, the tiewraps can be adjusted
to produce reasonable circles for each loop.
Note that the exact shape is not critical. Deviation from perfect circles is inevitable but
this has no significant effect on antenna performance. EN55015 states in section 7.2
that even the position of the UUT in the antenna is not critical.
9. Within the loop, construct a wooden stand or table to suit the products to be tested.
This is not included with the RF300 because it needs to be matched to individual
customers requirements. The stand should hold the product roughly central within the
loop.
10. Connect the loop transducers to the switch unit as shown in fig 11. The 3
transducer cables are identified by having thick RF absorber filters along their length.
Fit the cables so that these filters are nearest to the switch unit.
The switch unit is intended for floor mounting, or may be mounted on a suitable table
if preferred. The short co-ax cable acts as a patch cable to switch each input, one at a
time, to the output.
The output from the switch unit is connected direct to the analyser or receiver.