CRAWFORD BROADCASTING COMPANY

Transcription

1 CRAWFORD BROADCASTNG COMPANY KFMK -FM Rado 98 9 Medcal Towes Bldg Houston Texas 77 (7) RADO STATON KFMK PROOF OF PERFORMANCE MEASUREMENTS Octobe 978 Ronald D Haney Chef Engnee Executve Offces Floutown Pa Copoate Offces Dallas Texas WDJC -FM Rado Bmngham Alabama WDCX -FM Rado Buffalo New Yok KPBC -AM Rado Dallas Texas WMUZ -FM Rado Detot Mchgan KELR -AM Rado El Reno Oklahoma WYCA -FM Rado Hammond ndana KFMK -FM Rado Houston Texas WDAC -FM Rado Lancaste Pa WWGM -AM Rado Nashvlle Tennessee WPEO -AM Rado Peoa llnos WYRD -AM Rado Syacuse New Yok

2 CRAWFORD BROADCASTNG COMPANY N KFMK -FM Rado 98 9 Medcal Towes Bldg Houston Texas 77 (7) Novembe 978 The followng equpment pefomance measuenents fo Rado Staton KFMK wee conducted on the nghts of Octobe and Octobe between mdnght and 6am All measuements wee made by o dectly unde the supevson of Ronald D Haney (lcense # P -9-88) chef engnee of KFMK Kevn R Wyne and Mchael D Eggebecht both thd class opeatos egulaly employed by KFMK as announceopeatos asssted n the tests The test equpment specfed n the attached equpment lst was used fo all of the measuements and was connected as shown n the accompanyng equpment connecton dagam Po to ts usethe test equpment fequency esponse was checked and found to be wthn db fom hetz to hetz The esdual hum and nose and dstoton contaned n the audo geneato and hamonc dstoton analze combned was measued at 5 % All staton equpment was adjusted fo nomal opeaton ane all equpment used n the system between the mcophone nput and the tansmttng antenna was ncluded n the tests The compesson of the Collns 6U - was dsabled by emovng the tubes poducng the contol voltage The Tapco evebeaton unt and the URE equalze wee dsabled by swtchng them "out " The CBS was put n the test poston Measuements wee made fo each of the steeo channels wth the tansmtte n the steeo mode The ght channel was selected on the excte fo all mono tests The fequency esponse of the system was measued by adjustng the audo geneato to poduce the modulaton level ndcated wth the modulatng fequences ndcated ( hetz efeence) and vayng the fequency whle ecodng the geneato output equed to poduce the same modulaton level Executve Offces Floutown Pa The hamonc dstoton was measued by adjustng the audo Copoate geneato to poduce the modulaton ndcated wth the ellasfexas g - p Dallas Texas modulatng fequences ndcated and measung the dstoton WDJC -FM Rado Bmngham Alabama at the modulaton monto nstument output temnals wocx -FM Rado Buffalo New Yok The FM sn ato s gven elatve to hetz at % modulaton The AM nose and cosstalk wee measued wth the modulaton monto located at the tansmtte ste Steeo sepeaton was measued by modulatng each channel ( o ) wth modulatng fequences ndcated whle measung leakage nto the unmodulated channel ALL DATE CONTANED HEREN S TRUE AND ACCURATE TO THE BEST OF MY KNOWLEGE j X Peoa KPBC -AM Rado Dallas Texas WMLZ -FM Rado Detot Mchgan KELR -AM Rado E Reno Oklahoma WYCA- FMRado Hammond ndana KFMK -FM Rado Houston Texas WDAC -FM Rado Lancaste Pa WWGM -AM Rado NashvlleTennessee WPEO -AM Rado llnos RONALD D HANEY WYR Rado Syacuse e New Yok Chef Engnee K

3 EQUPMENT CONNECTON DAGRAM Heathkt Audo Oscllato coupls unt McMatn B -8 audo console Collns +5 -U compesso * URE Metotech Equalze ** Tapco Reveb Chambe ** Ì V V Telco loops COLLNS 8G - FM Tansmtte wth z - excte Bela Modulaton Monto CBS Volumax *** Heathkt dstoton mete * 6U- fo measuements RQ The %aac patched out ** The equalze and eveb wee swtched out fo measuements * ** The volumax was placed n the test poston fo measuements

4 RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 FREQUENCY RESPONSE MEASUREMENTS % Modulaton FREQUENCY MONO LEFT RGHT 5 HERTZ HERTZ HERTZ HERTZ HERTZ HERTZ + + ± HERTZ HERTZ HERTZ HERTZ % Modulaton 5 HERTZ HERTZ HERTZ HERTZ HERTZ HERTZ t + + HERTZ hetz HERTZ HERTZ READNGS NDCATED ARE THOSE OF THE OSCLLATOR AND MUST BE NVERTED FOR THE 75usec CURVE ALL READNGS TAKEN

5 RADO STATON KFMK OCTOBER 978 FREQUENCY RESPONSE MEASUREMENTS 5% Modulaton FREQUENCY MONO LEFT RGHT 5 HERTZ HERTZ HERTZ HERTZ HERTZ ± + + HERTZ HERTZ HERTZ HERTZ HERTZ READNGS NDCATED ARE THOSE OF THE OSCLLATOR AND MUST BE NVERTED FOR THE 75usec CURVE ALL TESTS PERFORMED B DATE kt- at 9 7 ZJ

6 ::7 `5 É; } O STANDARD PRE- EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNES A AND B A ' ' f ' ' ; AY B -- - ` 5 5 FREQUENCY -- CYCLES PER SECOND 5 AUDO FREQUENCY RESPONSE --- 5% MODULATON RADO STATON KNK HOUSTON TEXAS OCTOBER 97 MONO C}ANNEL

7 7 6 `5 O STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A LNESA ; UPPER AND LOWER LMTS AND B -' _-- - B ' e! FREQUENCY -- CYCLES PER SECOND '! -_ e AUDO FREQUENCY RESPONSE O% MODULATON Ì +! `' t ' 5 RADO STATON KFMK HOUSTON TEXAS OCTOBER 977 MONO CHANNEL

8 8 STANDARD PRE -EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNES A AND B Ru -' ml í _dííí h FREQUENCY -- CYCLES PER SECOND AUDO FREQUENCY RESPONSE -- -% MODULATON RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 MONO CHANNEL

9 7 6 5 O N STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNES A AND B ' s ' f t o FREQUENCY -- CYCLES PER SECOND J s Ì - ; ' '' f!` a AUDO FREQUENCY RESPONSE % MODULATON v - 5 RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 LEFT CHANNEL

10 7 6 x5 ' ' ' - B STANDARD PRE- EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNEA UPPER AND LOWER LMTS LNESAANDB A _ t % - L ' ~ ' _ ' ' FREQUENCY -- CYCLES PER SECOND J t ; " ' $ AUDO FREQUENCY RF- SPONSE % MODULATON RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 LEFT CHANNEL

11 7 6 5 L fl ;l STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNESAANDB A B s lly A l t! _ ; "" FREQUENCY -- CYCLES PER SECOND ` t ; ` ' a j 5 AUDO FREQUENCY RF- SPONSE -- -% MODULATON Rl'aDO STATON KNK HOUSTON TEXAS OCTOBER 978 LEFT CHANNEL

12 :7 :f 6 ìu 5 ; ;d s STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNES A AND B ' A t'- B --- -"" ' - f : _- % _ FREQUENCY -- CYCLES PER SECOND ; ` ' a j 5 AUDO FREQUENCY RESPONSE % MODULATON RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 RGHT CHANNEL

13 5 A A STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS LNESAANDB _ - ;! % ( f ' A -- _ -- - _ - - s 5 ' - ' ' ' FREQUENCY -- CYCLES PER SECOND j 5 5 AUDO FREQUENCY RESPONSE % MODULATON RADO STATON KFMK HOUSTON TEXAS OCTOBER 978 RGHT CHANNEL

14 7 6 5 l t _ STANDARD PRE-EMPHASS CURVE TME CONSTANT 75 MCROSECONDS LNE A UPPER AND LOWER LMTS A AND B - ' t t l B! A ` l - ' FREQUENCY -- CYCLES PER SECOND : ; AUDO FREQUENCY RESPONSE -- -% MODULATON h t 5 RADO STATON KFMK HOUSTON T ERAS OCTOBER 978 RGHT CHANNEL

15 MONO CHANNEL KFMK RADO 5% Modulaton 5% Modulaton % Modulaton Modulaton HARMONC FREQUENCY CONTENT 5 CPS CPS CPS CPS 5 CPS kc 5 kc ** ** % MODULATON 5 5% MODULATON lkc kc 5kc 5 kc kc 5 kc % MODULATON 5 l kc kc 5 kc MODULATON 5 kc kc 5 kc

16 6 HARMONC FREQUENCY CONTENT 5 CPS CPS CPS CPS 5 CPS kc 5 kc 5% Modulaton ** ** 5% Modulaton ** ** %Modulatonl [ Modulaton 5% MODULATON 5 lkc kc 5kc 5% MODULATON 5 kc lo kc 5 kc % MODULATON z 5 l kc kc 5 kc MODULATON á a W 5 kc kc 5 kc

17 RGHT CHANNEL 5% Modulaton 5% Modulaton % Modulatons Modulaton HARMONC FREQUENCY CONTENT 5 CPS CPS CPS CPS 5 CPS kc 5 kc 7 * ** ** ** ** % MODULATON 5 kc kc 5kc 5% MODULATON 5 kc % MODULATON lo kc 5 kc 5 kc kc 5 kc MODULATON 5 kc lo kc 5 kc

18 ' - - RADO STATON KFMK PROOF OF PERFORMANCE OCTOBER 978 CHANNEL SEPARATON N DECBELS FREQUENCY N HERTZ -LEFT NTO RGHT RGHT NTO LEFT ALL MEASUREMENTS TAKEN