ACCEPTANCE TESTING
7-15
CONNECTION TO RADIO output
Specification
Harmonics:
Typically better than
−
30 dBc for RF levels up to
−
36 dBm.
−
25 dBc for RF levels up to
−
13 dBm.
Isolation:
Isolation between any non-selected individual output and the
combined output is better than
−
60 dB,
Isolation between any two individual outputs is better than
−
80 dBm,
Isolation between the combined output and any individual output while
selected is better than
−
35 dBm.
2-tone intermodulation:
At an RF level output of
−
22 dBm on the combiner:
From 800 MHz to 2.2 GHz, better than
−
80 dBc.
Intermodulation levels reduce with reducing RF levels.
Test equipment
Description Minimum
specification Example
50
Ω
load
1 W, 50
Ω
nominal impedance, DC to 2.4 GHz
Lucas Weinschel
M1404N
Spectrum
analyzer
DC to 2.4 GHz frequency coverage
Anritsu MS2602A
Intermodulation
Test procedure
(1)
Connect the test equipment as shown in Fig. 7-4 with the spectrum analyzer connected to the
combined RF output.
(2)
On the UUT set source A to:
[Carr
Freq]
880
[MHz]
[RF
Level]
−
22 [dB]
Set source B to:
[Carr
Freq]
880.007 [MHz] (7 kHz spacing)
[RF
Level]
−
22 [dB]
[SIG
GEN]
[Combiner set-up]
[A O/P /
Σ
]
[B O/P /
Σ
]
[Exit]
[SIG
GEN]
(3)
Measure the level of the third-order intermodulation products on the spectrum analyzer at
the frequencies shown in
Table 7-26.
(4) Repeat (2) to (3) for each of the carrier frequencies shown in
Table 7-26.
