Jerrold DE-SNOWER DSS 2 Series User manual

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a GENERALINSTRUMENTcompany

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INSTRUCTION SHEET

435-578-03

DE-SNOWER@SINGLE-CHANNELVHF PREAMPLIFIERS

MODELS DSS-*, SERIES 2

DESCRIPTION

Models DSS-0, Series 2 consist of preamplifiers Model 802,

factory-tuned to specific VHF -TV channels or the FM .

band, and power supply Model 105.

Models 802 are designed with three basic circuit arrange-

ments: for low-band channels, for high-band channels, and

for the FM band (see Specifications). The preamplifiers

exhibit high gain, low noise, and high overload capability.

In adjacent channel areas, traps installed between the

antennas and the preamplifiers will maintain the necessary

selectivity.

Models 802 are enclosed in a cast-aluminum housing

designed for mounting on an antenna mast with the acces-

sories supplied. Power supply Model 105 is designed for

indoor installation near a 115V a.c. outlet and delivers a

nominal 16V a.c. to the preamplifier's d.c. supply circuit

through the down lead. Input and output connections to

the equipment are made through 75-ohm F fittings.

INSTALLATION

GENERAL

For maximum benefit from the signal strength available at

the antenna and for minimum pickup of undesired signals,

mount the preamplifier as near the antenna terminal as

practicable.

ACCESSORIESSUPPLIED

1 Mounting Bracket

1 V-Bolt

2 Self-Locking Hex Nuts

1 6-32x~~"Self-Tapping Screw

2 6xJ~"Woodscrews

4 F-659 Connectors with Ferrules and Expansion Tool

2 WB-659 Weatherboots

PROCEDURE

1. Start the supplied self-tapping screw through the hole

in the wide end of the mounting bracket; enter the

screw from the side of the bracket with the hook (on

the narrow end).

2. Slip the keyhole slot in the tab on the preamplifier

housing over the screw so that the hook on the bracket

engages the slot at the opposite end of the housing;

tighten the screw.

rJ-- -":o*,,~,"'

.\~ . ---~"{L

-- -

ANT.\~

MODEL 802

PAflT OF

De-SNOWER

CHAN PREAMP

MODEL DSS-2

us!: WITH pWfl.

SUPPL Y MoDEL to!;

Fig. 1 Preamplifier,Model 802

-..----

tf..p,:,,~r

"'.:1>.. .~.

"tI,\"G

1'0 ,..~~\..\f\e.f\

Fig. 2 Power Supply, Modell 05

3. Mount the unit on the antenna mast using the V-bolt

and self-locking hex nuts supplied; the preamplifier

terminals should face down.

4. Prepare a length of Jerrold Coloraxial cable sufficient to

interconnect the antenna and the preamplifier. Slip a

weatherboot over each end of the cable and install

F-659 connectors on the ends as described in Instruc-

tion Sheet 435-650, included in the accessory package.

5. Connect the cable between the antenna and the ANT

terminal on the preamplifier. Apply a coating of sili-

cone weatherproofing compound to the connections

and slide the weatherboots over the connections.

6. Prepare a down-lead of Coloraxial cable to interconnect

the preamplifier and the power supply. Slip a weather-

boot over the preamplifier end of the cable and install

an F-659 connector.

7. Connect the cable end with the weatherboot to the

preamplifier PWR SUPPLY terminal as in step 6, and

run the down-lead to the power supply location.

8. Mount the power supply near a II5V a.c. outlet with

the two woodscrews supplied.

9. Install an F-659 connector on the power supply end of

the down-lead and connect it to the power supply TO

AMPLIFIER terminal.

10. Prepare a length of Coloraxial cable to interconnect the

power supply TO TV SET terminal and the receiving

or distribution equipment. Install F-659 connectors as

before and connect the cable.

11. Plug the line cord of Model 105 into the II5V outlet.

The equipment is now ready for use.

TENANC!

This equipment will not require maintenance beyond

checks on signallevcls and intactness of cable connections.

In case of equipment failure, the schematic circuit diagrams

and replacement parts lists given here will permit trouble-

shooting and repair of the equipment by personnel familiar

with solid-state circuitry and equipped with the proper

instruments.

SPECIFICATIONS

R;EPL.AC

'----

ENT PA S

2-"

MODEL802 MODEL802 MODEL802

PREAMPLIFIER LOWBANDUNITS HIGHBANDUNITS FMUNIT

BANDWIDTH 6 MHz 6 MHz 20MHz

GAIN(minJ 30dB 30dB 30dB

flATNESS(pIv) 1.5dB 1dB 6 dB(88-92MHz)

2 dB(92-108MHz)

MAX.OUTPUTCAPABILITY

for 0.5dBsyncclipping 54dBmV 54dBmV N.A.

for 920kHzbeatdown50dB 50dBmV 50dBmV N.A. -

for3rdorder.beatsdown40dB N.A. N.A. 45dBmV

NOISEFIGURE(maxJ 5dB -6 dB - --

5 dB

TERMINALS

Impedance 750 750 750

Match 13dBmin.return 12dBmin.return 14dBmin.return

loss loss loss

POWERSUPPLY MODEL105

INPUT 115Va.c.,60Hz,40mA,5W

OUTPUT 16Va.c.

TERMINALS

Impedance 750

Match 14dBmin.returnloss

MODEL802(LOW-BANDUNITS) REF.DWG.NO.:863-259

ITEM SCHEMATIC JERROLD

DESIGNATION

QTY. DESCRIPTION PARTNO.

CAPACITORS

1Cl, 5,6,7, 71000pF,disc 123-115

10,11,17

2C2,4, 13,16 45-60 pF,trimmer 128-563

3C3,14 21.5-8.5pF,trimmer 128-572

4C8,9, 15 30.02,uF,200V 124-154

5 C12 1470,uF,25V,electrolytic S127-157

DIODES

6CRl,2 2 IN4148 137-824

7 CR3 1IN4003 137-788

RESISTORS

8 Rl 1 6.2ko,5%,t.4W 112-981

9 R2 1 1.3ko,5%, t.4W 112-064

10 R3,8 23300, 5%, t.4W 112-097

11 R4 1 3.3ko,5%, t.4W 112-936

12 R5 12.2ko, 5%, t.4W 112-932

13 R6 14700, 5%,t.4W 112-101

14 R7 1 200,5%, t.4W 112-083

15 R9 1 1800,5%, 1/2W 112-266

16 RIO 11.5ko, 10%,1hW112-383

TRANSISTORS

17 Ql 1Selected S130-601

18 Q2 1Selected SI30-152-02

1---=-

ISCHEMATIC

POWER SUPPLY

MODEL 105 II

C2 II(

1000 ~>o"AMP

.'i,r'"'

"1dIL

::'II'::

CI R2

~~MEO 1000 :g;.

LNOTE'

---;:ruCA",CITOR VALUES IN PF.

2. FOR ASSEMEL' OWO SEE CO". 102

MODEL802(FMUNIT) REF.DWG.NO.:863-260

SCHEMATIC JERROLD

ITEM DESIGNATION

QTY. DESCRIPTION PARTNO.

CAPACITORS

1C1,6,7, 10,11 51000pF,disc 123-115

2C2,13 224 pF,disc 124-176

3C3,14 21.5-8.5pF,trimmer 128-572

4C4 1 6.2 pF,disc 124-139

5C5 1 18 pF,disc 124-123

6C8,9, 15 30.02ILF,200V 124-154

7C12 1 470 ILF,25 V, electrolytic S127-157

8 C16 16.8 pF,disc 124-112

9C17 1 10 pF,disc 124-137

DIODES

10 CR1,2 21N4148 137-824

11 CR3 1 1N4003 137-788

RESISTORS

12 R1 16.2kO,5%, 1AW 112-981

13 R2 1 1.3kO,5%, 1.4W 112-064

14 R3,8 2330o, 5%, 1.4W 112-097

15 R4 13.3 kO,5%, 1.4W 112-936

16 R5 1 2.2 kO,5%, 1.4W 112-932

17 R6 1470o, 5%, 1.4W 112-101

18 R7 1 20 0, 5%, W 112-083

19 R9 1 1800,5%, ¥2W 112-266

20 RIO 1 1.5kO,10%, ¥2W 112-383

TRANSISTORS

21 01 1Selected S130-601

22 02 1 Selected S130-152-02

. -.--- ,- ,--

POWERSUPPLY,MODEL105 REF.DWG.NO.:861-653

SCHEMATIC JERROLD

ITEM DESIGNATION QTY. DESCRIPTION PARTNO.

CAPACITORS

1C1,2 21000pF,GMV,disc 123-115

2 C3 10.22pF,10%, 500V 122-042

CONNECTORS

3H,2 2F-61A C821-155

RESISTORS

4R1 1 1 MO,20%, ¥2W 112-743

5R2 11.5kO,10%, 1/2W 112-383

TRANSFORMER

6T1 1 Linetransformer 8141-203

MODEL802 (HIGH-BANDUNITS) REF.DWG.NO.:863-261

SCHEMATIC JERROLD

ITEM DESIGNATION

QTY. DESCRIPTION PARTNO.

CAPACITORS

1C1,5, 6,7, 9, 91000pF,disc 123-115

10,13,14,20

2C2,4, 16,19 45-60pF,trimmer 128-563

3C3,17 21.4-4.5pF,trimmer 128-574

4C8,11,12,18 40.02ILF,200V 124-154

5 C15 1470ILF,25V,electrolytic S127-157

6 C21 1 50 ILF,25 V, electrolytic 127-054

DIODES

7CR1,2 21N4148 137-824

8 CR3 1 1N4003 137-788

RESISTORS

9 R1 17.5 kO, %, %.W 112-986

10 R2,10 22.2 kO,5%, 1.4W 112-932

11 R3 1560 0, 5%, 1.4W 112-104

12 R4 1 3.9 kO,5%, 1.4W 112-979

13 R5 19100,5%, 1.4W 112-920

14 R6,11 2390 0, 5%, 1.4W 112-099

15 R7,12 2180, 5%, 1.4W 112-082

16 R8 12700,5%, 1.4W 112-993

17 R9 1 3.3 kO,5%, 1.4W 112-936

18 R13 13000,5%, 1.4W 112-096

19 R14 1 75o, 5%, 1/2W 112-221

20 R15 11.5kO,10%, ¥2W 112-383

TRANSISTORS

21 01, 2 2Selected S130-601

22 03 1 Selected S130-152-02

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,-W-I~POWER

II.BV .. G

SUPPLY

- I = = I

-RI R2 R4 R5 I-

: 6.2K 1.3K 3.3K 2.2K IT

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I = - - - CII I

I - - - = = ~~oI= :, 1.2~~:

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NOTES:

I. UNLESS OTHERWISE SPECIFIED.

A. ALL RESISTOR VALUES ARE IN OHMS, 1/4W, 50/..

B. ALL CAPACITOR VALUES ARE IN pF

C. UNMARKED CAPACITORS ARE 1000 pF

2. VOLTAGES MARKED WITH AN ASTERISK ARE MEASURED

WITH REFERENCE TO THE NEGATIVE BUS, OTHER VOLTAGES

ARE REFERRED TO GROUND; ALL ARE MEASURED WITH

A 20K.n./VOLT METER.

MODEL802 (LOW-BANDUNITS)

0863-259

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NOTES

I. UNLESS OTHERWISESPECIFIED

A. ALL RESISTOR VALUESARE INOHMS,1/4 W, 5 'Yo

B. ALL CAPACITORVALUESARE IN pF

C. UNMARKEDCAPACITORSARE 1000 of

2. VOLTAGESMARKEDWITH ANASTERISK ARE MEASURED

WITHREFERENCE TO THE NEGATIVEBUS, OTHER VOLTAGES

ARE REFERRED TO GROUND.ALL ARE MEASUREDWITH

A 20K.n./VOLT METER

LMODEL802 (FM UNIT) J

0863-260

TRANSISTOR NORMAL

QUIESCENT POINT

QI Q2

Ve. 13.2 9.B

lelmA) 5.5 15

Pd(mW) 72.5 147

BASING

BOGRO

IBOTTOM VIEW) E

TRANSISTORNORMAL

QUIESCENTPOINT

QI IQ2

Ve. 13.2 I 9.B

lelmAI 5.5 I 15

Pd(mW) 72.5 I 147

BASING

BQGRD

IBOTTOMVIEWI

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WARRANTY

Each unit of Jerrold Equipment is warranted for 90 days

against original factory imperfections in material and work-

manship.

In the event any unit of equipment should fail in service during

this period, pack the complete defective unit carefully, attach

a letter stating the reasons the unit was believed to be

defective, and return it to our Service Department, Jerrold

Electronics Corp., 15th Street and Lehigh Avenue, Phila., Pa.

19132, prepaying transportation charges. It shall be repaired

or replaced at no charge.

Such service or repairs as may be necessary as the result of

abuse or accident are not included in the warranty. In the

event of any service breakdowns after the warranty period,

this unit may be returned for repairs at a nominal cha.rge.

"7.-

..'

All data sUbjectto cl1ange)yithoutnotice.

JERROLDELECTRONICSOORPORATION

DISTRIBUTORSAJ.:ESDIVISION

PhUadelphia,Pa.19105

b, the Jerrold ElectJ:onics Corp., Enc. LaII. PublicationlDept.

8M, 11/10 43s..578-03 4455$

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