WIDE-BAND OPEN-WIRE PROGRAM SYSTEM 



359 



i 6 I I [OUT I jryi I I s~;ii I out| I s — i I 



9 9 '^V V ' 9 <? 9 



SECTION 8 



SECTION 4 



SECTION 2 



SECTION 1 



Fig. 7 — High-frequency attenuation equalizer. 



circuit as required. Figure 8 shows the loss-frequency characteristics 

 of these four sections. As may be noted, the loss of the various 

 sections is practically constant over the frequency range up to 1,000 

 cycles, decreasing from there on to a minimum value at 8,000 cycles. 



aj 3 



30 50 100 500 1000 5000 10,000 



FREQUENCY IN CYCLES PER SECOND 



Fig. 8 — Attenuation correction furnished by high-frequency equalizer. 



Section 1, as may be noted, furnishes about 3^ db attenuation correc- 

 tion. Section 2 is double that of Section 1, Section 4 is four times that 

 of Section 1 and Section 8, eight times that of Section 1. These 

 sections may be used in tandem so that attenuation correction for the 

 high frequencies is, therefore, provided in steps of ^ db from zero to 

 71/2 db. 



