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Sequerra 1 Owner's Manual

Fm tuner
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Summary of Contents for Sequerra 1

  • Page 2: Table Of Contents

    C O N T E N T S President's Letter Guarantee Certificate Two Warranty Registration Certificates Certificate of Measured Performance Operational Instructions Installation Instructions Front Illustration Immediate Operation Description of Tuner D i s p l a y s Back Panel Illustration D e s c r i p t i o n of Back Jack Panel Detailed Description of Scope Graticule and Trace Descriptions...
  • Page 3 Although the Warranty is in effect for five y e a r s , d e s i g n and manufacture of your Tuner Is aimed at a useful life of at least ten y e a r s . Should your M o d e l 1 F M...

  • Page 4: Installation Instructions

    A comprehensive discussion of F M and F M system problems (including antennas) is available f r o m t h e Sequerra Company in b o o k l e t f o r m . The price of $1.00 covers handling and mailing.

  • Page 5: Front Illustration

    For Immediate o p e r a t i o n (after p r o p e r l y f o l l o w i n g I n s t a l l a t i o n I n s t r u c t i o n s ) e m p l o y p u s h b u t t o n s a s shown by F u n c t i o n Arrows In t h i s I l l u s t r a t i o n . 5 1 7 4...

  • Page 6: Immediate Operation

    Sequerra " S " . This w i l l t u r n t h e set o n .

  • Page 7: Description Of Tuner D I S P L A Y S

    D I S P L A Y 1 M H z above and b e l o w the tuned frequency. The vertical pips of the scope's trace represent stations w h i c h are broadcasting a signal above the ambient interstation noise level, w h i c h is the base line.
  • Page 8 A l t h o u g h most people f i n d inter-station noise objectionable ( w i t h t h e high performance o f the Sequerra T u n e r this noise appears accentuated), it is useful in giving y o u a truer understanding o f w h a t is really happening t h r o u g h o u t the entire broadcast band.
  • Page 9 Sequerra " S " , the o n l y i d e n t i f i c a t i o n o n the f r o n t o f the set.

  • Page 10: Back Panel Illustration

    W I D T H C E N T E R F R O N T 1 0 5 - 1 3 5 V A C F U S E 5 0 - 6 0 Hz L E V E L...

  • Page 11: D E S C R I P T I O N Of Back Jack Panel

    Output Fixed - Use this o u t p u t t o plug i n t o stereo p r e a m p l i f i e r . Delivers 1 volt RMS for 100% m o d u l a t i o n f r o m an internal impedance of 6 0 0 ohms i n t o an open c i r c u i t or high impedance load.
  • Page 12 S l o w l y t u r n Intensity A d j u s t m e n t Clockwise u n t i l a very d i m (barely visible) trace appears o n the scope's screen. It is i m p o r t a n t t o keep this trace e x t r e m e l y d i m . A u t o ­ matic brightening c i r c u i t r y w i l l adjust the intensity as required during performance.
  • Page 13 M H z , and turning the t u n i n g k n o b w i l l n o t effect these readings. T h e Accessory jack is used to interface the tuner w i t h various accessories, i.e. the optional remote p u s h b u t t o n tuning assembly. 5 1 7 4...

  • Page 14: Detailed Description Of Scope

    A l l spectrum analyzers produce a varying n u m b e r of ambiguous and erroneous displays. T h e Panoramic Display in the M o d e l 1 T u n e r is n o e x c e p t i o n . T h e types of erroneous displays that...
  • Page 15 ( m a x i m u m vertical d e f l e c t i o n ) . 5 1 7 4...

  • Page 16: Graticule And Trace Descriptions

    D E S C I R P T I O N S - 1 2 0 d B , l V T 0 0 d B , 1 0 0 , 0 0 0 u V • 8 0 d B , 1 0 , 0 0 0 u V...
  • Page 17 C . Bend at top of pip k H z off center frequency. Indicates stereo pilot. Note: 3-pointed pip indicates station simultaneously broad­ casting S C A . D . Adjacent station 200kHz off center frequency. 5 1 7 4...
  • Page 18 T U N I N G Graticule Description Trace DescrlDtlon Amplitute (Signal Strength) Noise L e v e l Noise Density 75 k H z Spacings Typical (complete cycle) Trace Pattern For Dynamic Range see Panoramic Graticule Description 5 1 7 4...
  • Page 19 TRACE DESCRIPTIONS Soft Passages Loud Passages Over/modulation by Station not properly tuned (Full Modulation) broadcaster (causes distortion) Off-Tuned trace Weak Station Station with Low Amplitude Station with High Amplitude (Showing SCA s u b - carrier) 5 1 7 4...
  • Page 20 This w i l l be your best listening p o s i t i o n , even If it has less amplitude than in other positions. Very severe multipath (partial cancelation of signal) 5 1 7 4...
  • Page 21 TUNER VECTOR TRACE DESCRIPTION Right C h a n n e l U n l y Left Channel Only No Separation Between L - R Out.of phase Stereo Channels (Monophonic! Little Separation Between Maximum Separation Between Improper Balance to the Channels (Such as Centrally Channels Right...
  • Page 22 EXTERNAL VECTOR 4 CHANNEL TRACE DESCRIPTION Front Left Channel Only Front Right Channel Only Rear Right Channel Only Rear Left Channel Only Stereo L&R Front Inputs O n l y . Stereo L&R Rear Inputs, Only. 4 Channel - Maximum (Same as Stereo for Tuning Maximum Separation Separation Between Channels...

  • Page 23: Simplified Theory Of Operation

    T y p e X-Y Oscilloscope, a Frequency Counter, a n d a small A n a l o g Computer that derives all of the A u d i o Displays. The Model 1 F M T u n e r can be most easily understood in terms o f the functions of t h e individual modules i t contains.
  • Page 24 This counter uses a 1 MHz crystal as its time base, and has an accuracy o f ± 100 Hz reference to the stations frequency.
  • Page 25 V I S U A L D I S P L A Y S Y S T E M The Model 1 Tuner has a very complex Visual Display System w h i c h is driven b y the 12 volt A C power system.

  • Page 26: Block Diagram

    + 33VDC POWER SUPPLY +200VDC POWER TUNING POT TRANSFORMER 4 CHANNEL - I 6 0 0 V 0 C 7.4V TO 32V 120/240 DISPLAY 50-60HZ + SVDC COMPUTER 12 VAC PILOT LAMPS EXT INPUTS VISUAL DISPLAY SYSTEM 5 1 7 4...

  • Page 27: Back Jack Panel Socket

    REAR VIEW O F S O C K E T on BACK JACK PANEL (Enlarged 8 Times). 1. +15 Volt Supply -15 Volt Supply 3. Tuning Bias Supply 4 . Tuning Potentiometer Voltage Output Front End Tuning Voltage Input 6. Front End Tuning Ground C h a s s i s Ground •...
  • Page 28 CABINET M O U N T I N G INSTRUCTIONS & T E M P L A T E REMOVE FOR USE...
  • Page 29 For cabinet installation of The Sequerra M o d e l 1 F M Tuner, it is e s s e n t i a l to provide sufficient v e n t i l a t i o n . T h i s w i l l assure trouble free operation and long l i f e .
  • Page 30 " E " of the Template. Re­ move the Template and d r i l l 1/4" v e r t i c a l holes Into the shelf of the cabinet at the four "E"...
  • Page 31 -MARX THREE A L I G N M E N T POINTS " B " O K BACK O F CABINET PANEL |3)< DRILL THREE l / 1 6 * HOLES THROUGH BACK OF PANEL AT " B " M A W S 13) LINE A C U T HERE (l>...
  • Page 32 , f o l l o w i n g the procedures o u t l i n e d below w i l l a f f o r d protection against damage in shipment. 1. Use original carton and filler material p r o p e r l y packaged, sealed, and labeled.
  • Page 33 PACKING & REPACKING DIAGRAM - INSTRUCTIONS Be s u r e t o s a v e s h i p p i n g m a t e r i a l s and r e p a c k t u n e r a s s h o w n when s h i p p i n g . 5 ) 7 4...
  • Page 34 . Four 6-32 1/4" f l a t head, black oxide P h i l l i p s screws used i n securing tuner covers.
  • Page 35 S E Q U E R R A H P C O M P A N Y , INC. 7 1 - 0 7 W O O D S I D E A V E N U E , W O O D S l O E , N .
  • Page 37 S I G N A T U R E O F P U R C H A S E R T H E B E Q U E R R A C O M P A N Y , INC. 1 - F a c t o r y ' s C o p y...
  • Page 38 Tuner Serial N o . . Jate. 1. Volume S e n s i t i v i t y (2 dB) 2. Q u i e t i n g M o n o Q u i e t i n g M o n o...

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