A Useful Suggestion

Radio Record, Volume III, Issue 25, 3 January 1930, Page 31

A Useful Suggestion

Stabilising RF. Stages THD following puragraph from an English magazine might help those who had difficulty in stabilising a two stage R.I. receiver such as the 2 R.F. Browning-Drake. "You know how troublesome it has proved to me to screen two high-fre-quency amplifying stages successfully. But I have succeeded in carrying out this difficult piece of wireless work, and I considered that my success came from two things. v. "The first of these two things was -the employment of proper screening Jaizes for the screening of the variable jser and the high-frequency miormer of each of the two es, Before I forget,’let me give you a useful tip on this screening. It is io place two screening boxes a good four inches apart, This spacing makes all the difference, "The second of the two things which brought me success. was an idea entirely my own. It was to use leadcovered cable for the connecting wires in the amplifier and to earth the lead covering, The idea was used by German engineers in the war." --