Electronics progress report, April 1--30, 1949

Prospectus` of Band Pass Amplifiers for Proportional Counters and Instrumentation for the Study of the Electrodeposition Potential of Radioactive Elements have been submitted for review and approval. An error was found in calculations for the band pass amplifier discussed in Group 9 of the Electronics Progress Report,MLM-306, March 1--31, 1949, on the Cathode-Follower Probe. New calculations have been made and a band pass filter constructed to match the new values. Work on the cathode-follower circuit for coupling a Boron-wall tube to its linear amplifier indicated that the limit to the sharpness of a pulse which could be achieved was possibly caused by poor amplitude versus frequency response of the linear amplifier. To check this theory, modifications were made on an existing scaler which resulted in a frequency response flat up to 4.5 megacycles. Plans are being made to improve the amplitude versus frequency of the higher frequencies. The response curve shows a slightly rising characteristic at 4.5 megacycles and an attenuation at 7 megacycles. Construction of the rf generator has been resumed in an effort to deliver the finished product to Group 4 by approximately May 6, 1949. The meter circuit will measure relative rf output voltage instead of absolute voltage. The prospectus for the research on high speed scaling circuits has been completed and the prospectus for research on the high speed trigger pairs is being completed. The prospectus` of Parallel Plate Alpha Chambers and Scintillation Counting has also been completed