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Higher Sensitivity, More Hash
Lower Sensitivity, Less Hash
O pen 10
9.1
8.2
7.5
6.8
6.2
5.6
5.1
4.7
4.3
3.9
3.6
3.3
3
2.7
2.2
2
1.6
1.3
1
Resistor Value (M ? )
Figure 23: Sensitivity Degradation vs. Squelch Resistor
Squelching the output will reduce the sensitivity of the receiver and
therefore the range of the system. For this reason, the squelch threshold
will normally be set as low as possible, but the designer can make the
compromise between noise level on the DATA line and range of the system.
It should also be noted that squelching will cause some bit stretching and
contracting, which could affect PWM-based protocols.
It is important to recognize that in many actual use environments,
ambient noise and interference may enter the receiver at levels well above
the squelch threshold. For this reason, it is always recommended that the
product’s protocol be structured to allow for the possibility of hashing, even
when an external squelch circuit is employed.
Using LADJ
The Level Adjust (LADJ) line allows the transceiver’s output power to be
easily adjusted for range control, lower power consumption, or to meet
legal requirements. This is done by placing a resistor between VCC and
LADJ. The value of the resistor determines the output power level. When
LADJ is connected to VCC, the output power and current consumption
will be the highest. Figure 6 shows a graph of the output power vs. LADJ
resistance.
This line is very useful during FCC testing to compensate for antenna gain
or other product-specific issues that may cause the output power to
exceed legal limits. A variable resistor can be temporarily used so that the
test lab can precisely adjust the output power to the maximum level
allowed by law. The variable resistor’s value can be noted and a fixed
– 16 –
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