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Isolators/ Circulators
Installation and Tuning Instructions
When used as isolators, both single and dual models are available with a variety of load
terminations for the isolated ports. Retuning of these units may be performed in the field
in the 2-4 MHz bandwidth by following the instructions below.
These units can be retuned within this bandwidth specification by adjusting the tuning
capacitors located at the front and rear of the units. Retuning beyond the bandwidth
specification is not recommended in the field as this may require a re-adjustment of
magnets located internally to the units.
Single Stage Circulator
Dual Stage Circulator
Table 1: Electrical Specifications
VSWR: In/Out (all units) (23 dB+) 1.25:1 max
Note:
Ferrite isolators are subject to certain non linearities and may conduct or generate a weak signal harmonic.
nd
For proper IM protection, a low pass 2
harmonic filter is often used between the isolator and antenna to
nd
rd
nd
suppress the 2
and 3
harmonic energy of the transmitter. The Sinclair AF series of 2
harmonic filters
are available for this purpose.
1 |
P a g e
Tuning Instructions Number 025790 Rev: 1 Date: August 5, 2010
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Summary of Contents for Sinclair I3213A
- Page 1 For proper IM protection, a low pass 2 harmonic filter is often used between the isolator and antenna to suppress the 2 and 3 harmonic energy of the transmitter. The Sinclair AF series of 2 harmonic filters are available for this purpose. P a g e...
- Page 2 Tuning Instructions For The Dual Stage Isolator 1. Connect the signal source to the input port and monitor the output port. (The 50 ohms load used in the system must be terminated at the load ports). 2. Adjust capacitors C1 through C4 for minimum insertion loss at the centre frequency.
- Page 3 11. Adjust C2 and C3 for maximum isolation at the load port A. (This may require several minor back and forth adjustment for C2 and C3.). At this point, we are matching the two stages. 12. Restore all connection to step 1 and check insertion loss at the center frequency with the in connector on the input, and the out on the output.