RECOMMENDATIONS:

A determined attempt should be made next season to shift the ENE section of the induction loop (which tends to become unburied) to higher less steep ground, and bury it more deeply. Electro magnetic surveys of the summit plateau using the buried loop and a portable transmitting loop, which were proved feasible this season, should be given priority next season. The preamplifier/VCO in use for the infrasonic telemetry (1020 Hz) which proved intolerant of battery voltage fluctuations should be replaced with one similar to that in use with the loop.

Regarding the recording of the telemetry signals at Scott Base, it is noted that although the science technicians in 1981 were shown how to check the subcarrier frequencies, this was not done, and they are unable to say when the failures of the 1020, 1360 and 1700 Hz signals from the summit occurred during the year. Scott Base has since been provided with a simple tunable audio filter to make checking the subcarrier frequencies a routine matter.