If I setup to do an RxRestart after every measurement of RSSI, and if I record the time interval between RSSI measurements, an interesting pattern emerges:

`---------------------------------------------------------------------`

Radio Configuration:

====================

Receiver-Mode(RX)

Packet Mode, FSK modulation scheme

[ActualBitrate] 4799.760bps = nominal bitrate of 4800bps

[RxBw] 10416Hz

[RxBwExp] B101 (Bits 0-2 of regRXBW) = 5

[theRxBwMant] B10 (Bits 3-4 of regRXBW) -> [RxBwMant] 24

---------------------------------------------------------------------

0.0. RSSI=-116

1.0. RSSI=-116, elapsed=108uSec

2.0. RSSI=-116, elapsed=104uSec

3.0. RSSI=-116, elapsed=116uSec

4.0. RSSI=-116, elapsed=104uSec

5.0. RSSI=-116, elapsed=108uSec

6.0. RSSI=-115, elapsed=1752uSec

7.0. RSSI=-115, elapsed=112uSec

8.0. RSSI=-115, elapsed=108uSec

9.0. RSSI=-115, elapsed=108uSec

10.0. RSSI=-115, elapsed=104uSec

11.0. RSSI=-115, elapsed=108uSec

12.0. RSSI=-116, elapsed=1760uSec

13.0. RSSI=-116, elapsed=104uSec

14.0. RSSI=-116, elapsed=108uSec

15.0. RSSI=-116, elapsed=108uSec

16.0. RSSI=-116, elapsed=104uSec

17.0. RSSI=-116, elapsed=108uSec

18.0. RSSI=-115, elapsed=1760uSec

19.0. RSSI=-115, elapsed=104uSec

20.0. RSSI=-115, elapsed=108uSec

21.0. RSSI=-115, elapsed=104uSec

22.0. RSSI=-115, elapsed=108uSec

23.0. RSSI=-115, elapsed=108uSec

24.0. RSSI=-113, elapsed=1756uSec

25.0. RSSI=-113, elapsed=108uSec

26.0. RSSI=-113, elapsed=108uSec

27.0. RSSI=-113, elapsed=112uSec

28.0. RSSI=-113, elapsed=108uSec

29.0. RSSI=-113, elapsed=104uSec

30.0. RSSI=-116, elapsed=1752uSec

31.0. RSSI=-116, elapsed=116uSec

32.0. RSSI=-116, elapsed=104uSec

33.0. RSSI=-116, elapsed=108uSec

34.0. RSSI=-116, elapsed=108uSec

35.0. RSSI=-116, elapsed=104uSec

36.0. RSSI=-119, elapsed=1736uSec

37.0. RSSI=-119, elapsed=104uSec

38.0. RSSI=-119, elapsed=108uSec

39.0. RSSI=-119, elapsed=104uSec

40.0. RSSI=-119, elapsed=108uSec

41.0. RSSI=-119, elapsed=108uSec

42.0. RSSI=-115, elapsed=1756uSec

43.0. RSSI=-115, elapsed=108uSec

44.0. RSSI=-115, elapsed=108uSec

45.0. RSSI=-115, elapsed=104uSec

46.0. RSSI=-115, elapsed=108uSec

47.0. RSSI=-115, elapsed=108uSec

48.0. RSSI=-114, elapsed=1756uSec

49.0. RSSI=-114, elapsed=108uSec

50.0. RSSI=-114, elapsed=108uSec

51.0. RSSI=-114, elapsed=104uSec

52.0. RSSI=-114, elapsed=112uSec

53.0. RSSI=-114, elapsed=108uSec

54.0. RSSI=-119, elapsed=1752uSec

55.0. RSSI=-119, elapsed=108uSec

56.0. RSSI=-119, elapsed=112uSec

57.0. RSSI=-119, elapsed=108uSec

58.0. RSSI=-119, elapsed=104uSec

59.0. RSSI=-119, elapsed=108uSec

60.0. RSSI=-117, elapsed=1732uSec

61.0. RSSI=-117, elapsed=108uSec

62.0. RSSI=-117, elapsed=108uSec

63.0. RSSI=-117, elapsed=104uSec

64.0. RSSI=-117, elapsed=108uSec

65.0. RSSI=-117, elapsed=108uSec

66.0. RSSI=-114, elapsed=1756uSec

67.0. RSSI=-114, elapsed=108uSec

68.0. RSSI=-114, elapsed=108uSec

69.0. RSSI=-114, elapsed=104uSec

70.0. RSSI=-114, elapsed=108uSec

71.0. RSSI=-114, elapsed=108uSec

72.0. RSSI=-115, elapsed=1756uSec

73.0. RSSI=-115, elapsed=108uSec

74.0. RSSI=-115, elapsed=108uSec

75.0. RSSI=-115, elapsed=104uSec

76.0. RSSI=-115, elapsed=108uSec

77.0. RSSI=-115, elapsed=112uSec

78.0. RSSI=-116, elapsed=1752uSec

79.0. RSSI=-116, elapsed=108uSec

80.0. RSSI=-116, elapsed=112uSec

81.0. RSSI=-116, elapsed=108uSec

82.0. RSSI=-116, elapsed=104uSec

83.0. RSSI=-116, elapsed=108uSec

84.0. RSSI=-115, elapsed=1760uSec

85.0. RSSI=-115, elapsed=104uSec

86.0. RSSI=-115, elapsed=108uSec

87.0. RSSI=-115, elapsed=108uSec

88.0. RSSI=-115, elapsed=104uSec

89.0. RSSI=-115, elapsed=108uSec

90.0. RSSI=-115, elapsed=1732uSec

91.0. RSSI=-115, elapsed=108uSec

92.0. RSSI=-115, elapsed=108uSec

93.0. RSSI=-115, elapsed=104uSec

94.0. RSSI=-115, elapsed=108uSec

95.0. RSSI=-115, elapsed=104uSec

96.0. RSSI=-116, elapsed=1760uSec

97.0. RSSI=-116, elapsed=108uSec

98.0. RSSI=-116, elapsed=104uSec

99.0. RSSI=-116, elapsed=108uSec

Very often when the RSSI does change, it coincides with a much longer time to take the RSSI measurement (an order of magnitude longer).

That is to say: at lower bitrates such as these, the period between fresh RSSI measurements is noticeably longer.