The discriminator output is a square wave 
whose period is to be measured. It is first 
filtered by an output filter of high cutoff any- 
where from 14 to 80 cps. It is suitable to 
trigger an electronic counter set in its period 
position or the 10-period average position, The 
latter was used in initial calibration measure- 
ments and may suit the data acquisition as well, 
The average over 10 periods could be adversely 
affected by static noise bursts under poor signal 
conditions when the buoy is a long distance away. 
In this case several 10-period measurements 
should be made and those widely different from 
a median are disregarded. Single period 
measurement between static crashes provides a 
second alternative. 
CONCLUSION 
The temperature transducer attachment to 
the buoy, elementary telemetering link, and 
calibration are completed. Tests at a depth of 
14 feet have been carried out. A test at a depth 
of 100 meters is included ina paper by Walden 
and Franz@ of this conference. 
BIBLIOGRAPHY 
1. "A Radio Telemetering System for Ocean- 
ography,"' Franz, Ketchum, and Walden, 
W.H.O. 1458-29. May 1958. 
2. "Long Range Oceanographic Telemetering 
System,'' Walden, R. G., and Franz, D. H. 
Jr. ASLO and ISA Marine Sciences 
Conference, Woods Hole, Massachusetts, 
September 11-15, 1961. 
ACKNOWLEDGMENT 
The facilities of the Woods Hole Oceano- 
graphic Institution were used for the con- 
struction of the unit. Mr. Neil Brown is 
responsible for the basic stable oscillator cir- 
cuit. The author's work represented by this 
report was accomplished during a stay at the 
Woods Hole Oceanographic Institution arranged 
by mutual agreement with HRB-Singer, Inc. 
49 
