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Appendix B. Advanced Setup Menu

send the same packet up to 3 times; each time looking for an ACK packet back from

the receiving radio. If it does not receive an ACK packet after sending the packet 3

times, the transmitting radio will increment its Number of Retry Failures count. If a

radio is configured to do retries, it will produce an ACK packet for every RF packet

that it receives, addressed to it, that has a valid CRC. If 0 retries are configured, the

receiving radio will simply throw away any packet that fails the CRC. This reading

is cleared upon exiting Setup Menu or cycling radio 12 V power.

B.3 Received Signal Strength

Beginning with SW Version 6.420 the radios provide a means of knowing the signal

strength of the last packet received, addressed to it, that had a valid CRC. To see

this reading enter the radio’s Setup Menu /Advanced Setup/Radio Parameters/Radio

Diagnostics menu. RSS readings are cleared upon exiting the Setup Menu or

cycling the radio’s 12 Volt power.

The RSS reading is a relative signal level indication expressed in dB (decibels).

Readings may vary up to 10 dB from radio to radio for a given received signal level.

The weakest signal reading is around 25 dB and the strongest signal reading is near

86 dB. Although the RSS readings are not absolute, they will be of value in such

activities as:

• determining the optimal direction to aim a yagi antenna

• seeing the effects of antenna height, location

• trying alternate (reflective) paths

• seeing the effect of seasonal tree leaves

B.4 Advanced Setup Standby Modes

The Standard Setup menu selections should fill the majority of user needs. The

following information is given in case you need to program a non-standard standby

mode.

The Standard Setup menu selections do not correspond with Advanced Setup menu

entries. For example: selecting a “3” in the Standard Setup menu selects (< 2 mA 1

sec Cycle) whereas entering a “3” in the Advanced Setup menu selects (< 4 mA 1/2

sec Cycle).

B-4

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Campbell RF400 Handbuch Seite 56