I N STRUCTI ON M AN UAL 117B 20 WATT VHF HI GH BAND TRANSLATOR AXCERA, LLC 103 FREEDOM DRI VE P.O. BOX 525 LAWRENCE, PA 15055- 0525 USA ( 724) 873- 8100 • FAX ( 724) 873- 8105 w w w . ax cer a. com • info@ax cer a.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Ta ble of Con t e n t s Ta ble of Con t e n t s 1. I nt roduct ion: 2. Syst e m – 1 1 7 B: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1175- 1000 a. b. c. d. e. f. g. h.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Syst e m D e scr ipt ion The 117B is a 20 Wat t High Band VHF Television Translat or which operat es at a nom inal I nt ernally Diplexed out put pow er of 20 Wat t s Peak Sync Visual w it h t ypically 2 Wat t s Aur al at a - 10 dB Aural/ Visual Rat io.
VHF Solid State Transmitter / Translator 110A / 110B / 112B / 113B / 114B / 115A / 115B / 117B / 118B / 119B ■ Completely Solid State ■ Designed for unattended operation with built-in remote control interface ■ Small size – ideal where space is limited ■ Class A amplification up to 20W for excellent linearity ■ Extensive front panel status and metering ■ Slide out tray assemblies for ease of maintenance with no extenders ■ BTSC Stereo Ready
VHF Solid State Transmitter / Translator Visual Performance Power Output (Peak) Output Impedance Output Connector Frequency Range (low band) Frequency Range (high band) Carrier Stability (Transmitters or Translators with FCR) Frequency Translation Stability (Translators) Regulation of RF Output Power Output Variation (over 1 frame) Sideband Response -1.25 MHz and below -0.75 to -0.5 MHz -0.5 to +3.58 MHz 3.58 MHz to 4.18 MHz Freq Response vs.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or I nst allat ion Procedure UNPACKI NG Please inspect all m at erial t horoughly upon arrival. Axcera cert ifies t hat upon leaving our facilit y t he equipm ent was undam aged and in proper working order. The shipping cont ainer should be inspect ed for obvious dam age t hat is indicat ive of rough handling.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or I nst allat ion Procedure For unit s t hat are supplied wit h a cabinet , rem ove t he Cabinet from t he shipping cont ainer. Rem ove t he plast ic covering. I f t he Trays are shipped separat ely, t he shipping m at erial m ust be rem oved from t he inside of t he Cabinet before t he Trays are insert ed int o t he Cabinet . Cut t he cable t ies or cord which hold t he Tray Harness breakout s t o t he Tray Slides.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Sy st e m Ch e ck Ou t a n d Opera t ion Procedure SYSTEM CHECK OUT AND OPERATI ON PROCEDURE Connect t he out put at t he " N" Ty pe connect or J4 of t he 20 Wat t VHF Upconvert er/ Am plifier Tray t o a suit able load or t he Ant enna for your Syst em . Connect t he Low Band VHF Channel RF I nput Signal t o Jack J1 locat ed on t he r ear panel of t he Receiver Tr ay. Sw it ch t he AC Main Cir cuit Br eak er on.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Sw it ch Posit ion a nd St a t us for N orm a l Opera t ion Sw it ch Posit ion a nd St a t us for N orm a l Opera t ion VH F Low Ba nd Re ce ive r Tr a y ( A12) I F ALC Board ( 1109- 1402) S1 sw it ched t o ALC posit ion.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Syst e m Alignm e nt Pr oce dur e The Translat or has been fact ory aligned and should not require adj ust m ent t o obt ain norm al operat ion. For a Det ailed Alignm ent Procedure of each Tray, refer t o t he Receiver Tray or t he 20 Wat t Upconvert er/ Am plifier Tray sect ion of t his Manual. SYSTEM SET UP The sy st em set - up includes adj ust m ent of linearit y t o com pensat e for any am plifiers nonlinear r esponses.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Syst e m Alignm e nt Pr oce dur e To adj ust t he linearit y correct ion from scrat ch, preset t he Linearit y Correct or pot s R5, R16 and R26 ( t hreshold) t o CCW and Linearit y Correct or pot s R2, R11 and R22 ( m agnit udes) CW. I nsert a 3.58 MHz m odulat ed st aircase or ram p video t est signal int o t he Tray and m onit or t he different ial gain of t he out put .
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Re m ot e Cont r ol Conne ct ions Re m ot e Cont r ol I nt e r fa ce Ja ck ( J7 ) 3 7 Posit ion " D " Conne ct or Funct ion Con n e ct or I nt e r fa ce Type Rm t Operate Com m and Rm t Operat e/ St andby Rt n Rm t Standby Com m and J7 Pin 1 J7 Pin 2 J7 Pin 3 Cont act Closur e Rm t Operat e I ndicat or Rm t Operat e I ndicat or Rt n J7 Pin 4 J7 Pin 5 50mA Max.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt ) Fr e qu e n cy Cor r e ct ion Circuit Descript ion The UHF/ VHF Receiver Tray w / ( Opt ional) Frequency Correct ion select s t he desired UHF or VHF On Channel I nput Signal and convert s it t o a Com bined I F Signal of 45.75 MHz Visual + 41.25 MHz Aur al.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt ) Fr e qu e n cy Cor r e ct ion Circuit Descript ion Com bined I F Signal Pat h The L.O. and t he RF signals are m ixed in t he Mixer St age of t he Downconvert er Am plifier Board t o produce t he desired I F difference frequency at - 55 dBm t o - 10 dBm in level, depending on t he RF I nput Level.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt ) Fr e qu e n cy Cor r e ct ion Circuit Descript ion The AC input t o t he Tr ay is 117 VAC or 230 VAC and is dir ect ed t hr u Jack J2, of t he ( A1) Pow er Ent ry Module ( 1265- 1104) , t o t he st ep dow n Toroid ( A2) .
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt iona l) Fr e que ncy Cor r e ct ion Det a iled Alignm ent Procedure Connect a UHF or VHF I nput wit h a Mult iburst Test signal applied, t hat is at t he desired Channel Fr equency , t o J1 50Ω or J5 75Ω locat ed on t he r ear of t he ( A3) VHF/ UHF Receiv er Tr ay . Check t hat t he On/ Off Sw it ch locat ed on t he r ear of t he Tr ay is On.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt iona l) Fr e que ncy Cor r e ct ion Det a iled Alignm ent Procedure ( A4) Channel Oscillat or Assem bly, Dual Oven ( 1145- 1202) - Cont inued Cont ains: The ( A4- A1) Channel Oscillat or Board, Dual Oven ( 1145- 1201) .
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt iona l) Fr e que ncy Cor r e ct ion Det a iled Alignm ent Procedure ( A6) UHF Filt er ( 1007- 1101) , VHF LB Filt er ( 1034- 1211) or VHF HB Filt er ( 2065- 1000) This filt er has been fact or y sw ept at t he L.O. fr equency and should not be t uned w it hout pr oper equipm ent . The out put of t he filt er ( + 15 dBm ) is connect ed t o J2 on ( A10) t he Downconvert er/ Filt er Assem bly.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or UH F/ VH F Re ce ive r Tr a y, w / ( Opt iona l) Fr e que ncy Cor r e ct ion Det a iled Alignm ent Procedure ( Opt ional) ( A15) I F Carrier Oscillat or Board ( 1100- 1206) - Cont inued 3. Connect a Frequency Count er t o J1 and check for t he 50 kHz signal. Adj ust C17, if needed, t o at t ain t he 50 kHz frequency. Rem ove t he Jack on J5. DS2 t he Unlock I ndicat or should light . Replace t he Jack ont o J5.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Circuit Descript ion The VHF Upconvert er/ Am plifier Tray t akes t he m odulat ed Visual + Aural I F input from t he Modulat or or Receiver Tray and m ixes it wit h a generat ed L.O. t o produce t he desired VHF High Band Channel Fr equency out put . The Tr ay t hen am plifies t he VHF signal t o t he 20 Wat t peak of Sy nc Visual Out put power level.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Circuit Descript ion The RF Signal is bandpass filt ered for t he desired VHF Channel frequency and t hen am plified by U1 ( - 2 dBm Visual - 12 dBm Aural) before it is connect ed t o t he RF Out put Jack ( J2) of t he Board. The VHF out put is connect ed t o J7 of ( A16- A2) t he VHF Filt er/ Am plifier Board ( 1150- 1101) on which it is filt ered again and j um pered from J6 t o J1 on t he board.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Circuit Descript ion Also locat ed on t he front panel of t he Tray is ( CB1) t he 7.5 Am p On/ Off Circuit Breaker, which dist ribut es AC t o t he t w o pow er supplies, t he ± 12 VDC and t he + 26 VDC, t hat are part of t he Tr ay.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Det a iled Alignm ent Procedure Use t he I F Out put of t he Modulat or or t he Receiver Tr ay t o dr ive t he VHF Upconvert er/ Am plifier Tr ay . Th e Upconvert er/ Am plifier Tray includes adj ust m ent s for aut om at ic level cont rol ( ALC) of t he drive level, linearit y ( am plit ude pre - dist or t ion) predist ort ion and t he RF am plifier st ages.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Det a iled Alignm ent Procedure PRESET THE FOLLOWI NG SWI TCHES: ( A10) ALC/ AGC Board S1 t o ALC Manual S2 t o AGC Manual ( A11) Linearit y Correct or Board S1 t o Off ( A10) ALC/ AGC BOARD ( 1067- 1116) The I nput I F signal is cabled t o ( J1) I F input of t he ALC/ AGC Board. 1. Rem ove t he J1 plug from t he board, obser ve t hat DS2, I nput Fault , light s. and observe DS2 ext inguished. Reconnect J1 2.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or THE FOLLOWI NG DETAI LS THE MEANI NG OF EACH LED I LLUMI NATED. Upconve r t e r / Am plifie r Tr a y Det a iled Alignm ent Procedure ON THE ALC/ AGC BOARD WHEN DS2 - Abnorm ally low or no I F signal is present at t he I F input connect or J1. DS3 - I ndicat es t hat t he ALC circuit is unable t o m aint ain t he signal level request ed by t he ALC r efer ence.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Det a iled Alignm ent Procedure The out put of t he Am plifier Board at J2 ( + 44 dBm Visual and + 34 dBm Aural) is fed t o t he Low Pass Filt er Board. ( A18- A1) LOW PASS FI LTER BOARD ( 1174- 1102, 1174- 1103 OR 1174- 1104) The Low Pass Filt er Boar d is adj ust ed at t he fact or y and should not need t o be adj ust ed in t he field.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or Upconve r t e r / Am plifie r Tr a y Det a iled Alignm ent Procedure ( A7) TRANSMI TTER CONTROL BOARD ( 1161- 1109) The adj ust m ent s on t he Boar d w er e set at t he fact or y and should not be r ealigned. ( A9) AGC CONTROL BOARD ( 1137- 1201) The AGC Cont rol Volt age is adj ust ed by R3 for 1 VDC at TP3.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or D r a w ing List ( Suba sse m blie s) D r a w ing List ( Suba sse m blie s) ± 12V Power Supply Board Schem at ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001- 3009 I F Filt er/ Am plifier Board Schem at ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or D r a w ing List ( Suba sse m blie s) VHF Low Pass Filt er Board, 174- 192 MHz Schem at ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1174- 3102 VHF Low Pass Filt er Board, 193- 216 MHz Schem at ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or M a in t e n a n ce The 117B is designed with components that require little or no periodic maintenance except for the routine cleaning of the Trays. The amount and time interval between cleanings depends on the conditions within the Transmitter room. The air flow through the cabinets will be lowered which could cause heat related problems if the fans in the Cabinet are not cleaned.
1 1 7 B 2 0 W a t t VH F H igh Ba nd Tr a nsla t or M a in t e n a n ce LOG BOOK FORMAT 117B 20 WATT VHF HIGH BAND TRANSLATOR MODEL NUMBER: 117B SERIAL NUMBER: DATE UNIT INSTALLED: BY: DATE TAKEN: BY: 20 WATT VHF UPCONVERTER/AMPLIFIER TRAY METERING % Visual Power % Aural Power % Reflected Visual Power Power Supply Voltage AGC Detector Voltage ALC Detector Voltage NORMAL 100% 100% <10% +24VDC +.
