Hp 8731b Service manual

(

1 '

( , r

(

MANUAL

8731B~'

87328

87338

87348

87358,

.,~~W~

HEWlIE~T

jPACKARD

\::' '

1'\' ',,'

[)

8731A

, ",

,'8732A

8733A

8734A

8735A

)Jr'f'

, I

MODULATORS

I!:

'/'

'!\,

" i

,'.

,',

...

,1\ t

I',',

".\

, I

,',

','

l '

,I"~

I,',',

I:,

':""

,',

',I

" I

(~y~":'.~

:·!;'\tr,

IModel

8730A

Series'

I '

:",

," ,

,PERMANENT M1JUNTING ""': ''

FO~6-32tapp"d,mounting

holes have been pro-

vided

for

mounting

purposes.

The

location'

these ,

holes and

the

I~VeraII

external.:dimensions 'of:)the 1

, PIN,Modulator l,are illustrated in Figure' 2.

' '

.'/~~

Also

tt,e

Modu

lator underside

are,

, the

foufco~er

retaining screws and the

diode retaining screws.

Any

moue-

ment

olr

adjustment

of,

diode retaining

I '

"',

screuie

ioill cause permanent damage. "

PRINClfLES

~PERATION

, !

The

PIN,Modulator

is a high-speed, current-con-

trolled 'absorption

type

attenuator. Asimplified

,illustration

the

modulator

is shown in Figure

3."

Each PIN

unit

includes alow-passfilter, .two high-

pass' filters, a

number

PIN diodes" and a

50~ohm

'strip

transmission, line (ridged waveguide' in

the

,',

higher frequency

M,odeI8733,

8734,

and

8735

units).

The

PIN diode is a silicon

junction

diode whose P

and Ntrace regions are separated by a layer

in-

trinsic (I) semiconductor (silicon).

Thus

the

name

PIN diode.'

frequencies below

about

100 MHz

the

PIN,

diode rectifies

as,

junction

diode. How-

ever

,frequencies above

100

MHz, 'rectification

,,'

ceases-due

stored,charge

the

iritrinsicIl)

layer'

and

'the

diode

:;~cts

like aresistor by conducting

current

in"

both

directions. 'Thi,s equivalent resis-

tance is inversely proportional,

the

amount

charge

the

I' layer. An increase in forward bias

"current,

(current'

'at a negative voltage) increases

, . \

the

stored charge and decreases

the

equivalent re-

sistance

the

PIN diodes. When reverse bias is

applied,reverse

current

flows 'until stored charce.is

depleted

at which

time

equivalent resistance be-

comes

amaximum in

the

order

'thousands

ohms.

, ,

I '

a. Maximum

temperature:

149°F(+65°C)'.

,,,

b. Minimum

temperature:

-40

o'F

(~~(fC).

'c. Humidity Maximum: 95%.

Environment.

Temperature

during storage

ship-

ment

should belimited as follows:

Diodes in Shunt.

understand how a PIN

Mo~ulator

works, considerthe following:

the

PIN '

,di()l\~es

are'

mounted

shunt

elements between

the

"'UJl1':l'\~;ransmissiollpa~h

and ground.

The

transmis- '

,::sfQ~(\',I!path

hasu-eharacteristicimpedance

of,50ohms.

,:,'

\Vhe:n"

the

PIN'dinges are forward-biased,

the

equiv-

c. Wrap

instrumentin

heavy protective

paper"

alent: diode resistance is

about

ohms

and

most

avoid abrasion. ' , of;

Ifhe

,Hi"

energy':' is absorbed by

the

diodes in-

.stead

propagating down

the

50-ohm transmis-

sion p,ath.

'However,

when

the

diodes are 'reverse-

biased

'the

equivalent diode resistance is

the

.','

,.'

,.',' ".

order

thousandsof

'ohms and

the

microwave,

, "

',',

' "

,"""

.,'/:.

' ,

"I.

• ': / " ,

the'

original

carton

n~t

usable, a

do~ble.:

walled

carton

0(1.4

MPa

(200

lb/sq

inch) bursting'

_,\l

strength should be used. ' ' '

STOR,AGE

AND

SHI,PMENT

,;.

INTRODUCYI'PN "

The

He~lett.Pa~kard

'8730 series

'PIN, modula-

tors'

are 'variable

attenuators

whose

input

and

output

impedance is nearly

constant

for

all levels

attenuation.

The

8730,

PIN Modulators cover

the

coaxial range from 0.8

12.4

,GHz

four

overlapping

bandsin

addition

'X-band

ill

wave-

guide.

Two

models

are, available'

in,

each

band;

'~A"

model

'which'provides

least

.at-

tenuation

range" arid

"B'tmodel

which .provides

,least

dB,~

,Typbal

uses include pulsing" switch-

ing, leveling,

and

amplitude, modulating

RF sig- ,

naIs. Table 1lists

complete

PIN Modulator speci-

fications.

Maximum

Power.,

The

maximum.Input rating

(peak

CW),',

for

the

PIN Modulators

is'1

watt.

Excessive

power

levels will cause internal

damage.

Maximum Bias

Input.

voltage applied to

the

BIAS

input

must

not

exceed

+20

volts

-10

volts. '

Bxcessive

voltages

may

cause

internal

damage; ,

Packaging; \To'

protect

the

8730

PIN Modulators

during 'storage

shipmentv always use the

best

packaging'

methods

available.

The

following sug-

gested steps:

can

be used

asa

guide

for

packaging.

The

~:i'liginal'

carton,

undamaged, can be

'reused. \ ''

"d.Place in carton,surrounded

least.

four

inches

tightly packed shock absorbing''material.

Sealcarton

with

strongtape

.or

metal

bands.

PRECAUTIONS

,,'

Page 2

, I

"',

I .:

Model'

87301\.

'S~rie~

":','

Page

__..........__,

•.....

_ ......

.:.t;

:,.•....

----'-~_._---

------

•

MODEL

entS

t"'!---,---

-----,-,

,iliI2911

~-",,---

'--'

.;.j!!I-

t-"---~---9'IUI.'I------·'"11

,:,

i~l

Ii'

06 )

1'"1

115,011

'I..'

,,\,;

,,:,:,··

.J·I·

iii'll

........ 'l

.rl~-'

-=....._",.

",,_~~_:2,:';,j\

"i"r'~

'(J

NOTE,'.

DIMU'SIO~~

INtMU

.110 IMILLIIII£TEIISI

,..'.

I:'

1191

MODELe'7~2B

NOTE

DllIIlNSIOliIB IN

INtHIS

AIID IMILLIIllIoTE"SI ,

MODEL

8732A

NOTE

. .

DIMINSIOIlS IN

INtlllS

AND

IMIi.LIIlItTIIIS,

I11 ' .:

•.

·lIZI.5)r-.-

.....

-... ... ·

·_·_·

IOR

CZ•51

.....J.::_.

...

......

~-...:..~

·1 -

".-7.11

71.11- - .- - - -- - ,

J..

~_,

'e'

>'~~:

.:':

e,'.:

",:

"}c'~-'

.l-:

~t,

'--'\--"F':="'"''

...

::..,..::.~~

==::..",:..=-=.-".=-""~.,+-..J._-

(1~'7,i

' •

of·

, '

.,_.

... ----1

-.:~:.::_

..::-::=:=.

'".

"R-:::"

-.-

---~-

Dill"

.'u.",

:"\

.·u

•.

NOTE

OIIllIIlSIONS III

lilt

HIS

ANDIMILLIIIII

H"S

- .-

...

.....

1171l

.....

-.--4.11I~11

......

,.,. r_.

I I

" , •

i , -

...

--.--,,---~"

1.J.

114)

•r- -

"""

.....

- .. - ..

'"1;'1

.~~

•

....

__.._.....

oM, '

I I I I

~".J

-r:::ro-~~'::'

-;l

-==·~.ti

_-:_,

~:=.~_

....

...

~~~lti

MODEL

B735A

211

;--

. :2.I!Ill1 \

,.\

Figure

1. ,

General

Outside Dimensions

r-,

//1,'

",.".',

'..

.'.

," ,

1.\"

,,'

"',.:

,I )

I':,

2.0

30,

:l.5

1.6:

2.2

+20,

-10

100.

W/G7'

'30

1.7

2.0

2.5

.1.1

+20,~10

300

'(, ;,

1.8,

from

1.8

to 4.0 GHz

2.0, from 4.0 to 4.5 GHz

Model

8730A&

BSeries

:::1,';,

.',

I'"

1.\

",',

+20,,-10'

1,00

8734~,

. "

87348

,".'

8735A

87'35,IS'

7.0-12.4

\7.0-.12.4 8:2-12.4," 8.2-12.4

35 I

;,;?~O

.35

<4..

(},

<5.0 <4.0 <5.0

30 ' 30:

20 20

2.0

·~.O

2.2

N8, N

3.5 2.5 a.5

1.6 1.1 I1.6

,',

.:.

I-

,.'1'1'://

+20,~10

.+20,-10

+20,-10

300 100 300

2.5

~.1

8733A

87~3B

7-8.:1 ,,3;7-8.3

35 . 80

<2.0' <3.0

30 30

20"

20 '

1.8 2.0

a.o

2.2

j,l'

\ 1

Nlj

5.5

2.5 "

'87328

1.8~4.5

,80

<3.5

20'

1.6

,2.0

8732A

1.8":4.5

2.0,

1.5

1.8 9

, Table 1. .Speciftcations

'-',. '

•.

Negative.

voltage,applieli forwardbias to diodes

,6. At attenuation levels

01;

10 dB or more, ' "

Fit~

1 x 0:5 inches

(WFL

90)

waveS:;..tid~',',

8. Standard female type N " ,

1.6

'2.0

87318

o..8~,2.4

80,

<2.0,

, .

,,8731A

+5 Vdc bias

Frequency

Range

(GH

z,)

0.8-2.4

0111:1 mic: Range

(dB)

'.,

Mh"

InserttonLoss

(dB)

<1.5

Typical

Rise

Time

(n8)3 40,

Typical

DecayTi~'~

(DI)S ;30

SWR, Minimum:,Atte auatton l . 1.5

SWP.,

Maximum Atten iatlon t..8

Maximum'Input

Power,

1 "

'~:::'~:~~~~::~:I~:s

;11~

+2;O~1

+2~~~1

O+2~~~

+2~'O-OI

Resistance

(ohms)6

pu\

8 ' 88

Fconnector.

Type'

,\~N

N N

Weig~t{lbS~

3 5.5 a

!,(kg) 1.4 02.5' I1.4

Dimenstons

'UU8trated

in Figure 1. '

<4.0

dB, 4.0 to

4.Ej

GHz \ .,

a.Driven

by HP 8403A Modul \tor

, , "

4.'

210,

from

4.0

to 4;5 GHz "

,\P~e4

" I

,"--,'.

1'::,.,;,'/,/',

,'"

,,'

•

'\ ,

·f.

-t--

.........

_~----_.'----

-,----'

2,0

,4.0·

6.0,

12.4

.FREQUENCY· (GH1)

01,0

',1

"j"

",f,

F;gure,'3.

Typical Insertion Loss

Curves

•

'I"

.........

'" ,,

-,-,

...

~---

-'-,,----~

.•-_:..-

.:-.

_."'~"--'

-".,

...

'0'

.......

"I"

(I)

, )'

t/)

o "

..J'

2----,,-~

-,I

....

Il:

8732B~.

I" •

I '

dB'irripro.~ement

insertion.loss over zero bias.

Atypical plot.

the

maximum values

minimum'

insertion 'loss is shown in Figure 3. Note: a.typical

,plot

fcir

the

"A'" models would be

the

same except '

I. : . .

that

maximum losses are less,

...

'.'

,'.:'

'.'

The

attenuation

increases with forward

bioi

cur-

rent

almost linearly in dBuntil

diode

saturation

co-

curs. The

attenuation,

sensitivity varies

from

unit

but

the

sensitiV',ity of. 'a 'given unit

predict-

able, Therefore,.intermediete values of'attenuation

can

derived

once

,the

current

values,

for

t, low

. .and high

attenuation

are 'established, The range

expected

sensitivities

shown

the

shaded areas

• I _, I •

currents

will',

flow

down

the

'~ransmissibn

path

be-

cause";

diode resistance

camp

ired

the

50-ohm

path

impedance

negligible.

',',.' .\'

>+:i:,1('

~~_

,',

-Figure 2. Simplified

Block

\?iagram

Modulator \:

".'\

I:, :

~IASING

, •

'I.'

,:!,

:0 "

Each individual PIN Modulator

has'

label

attached

the

'underside

its casting body

Thi's

label has

'a,

'dc

bias currentvalue stampedjonto:

it.

This

,stamped current,

is'

the'

forward-blas

current

re-

quiredto produce rated" RF attenua ion across

the

,frequency

band,

For

"A"

models,

the

.bias

current

I •

.for atleast 35 dB is typically

3~5

to'

milliamperea'

(about

...:.0.7

volts 'de

.the BIAS

ut),

For

'''B''

i ,

)models;

the

bias current for

at,:le~st8(),

istypi-

cally 6 to 7milliamperes

(about

"--0.1'

volts de

the,

BIAS

input).

~or

applications. Wiere a .mini-

.',l,nup} insertion loss is

imporl~nt,

rerse

bias

about

+5.'to

7(.vo~tsd~may

be applied, 0

the

BIAS'

,in~ut.

,R~verse"biaSin~can,result

'~s

much

as a

I '

:Pag(,5

.,.

...

"'..

,.-.,~.,

--..

~.-

.•...••.

h~_··

.."_..

·'M

··

" , I,

"'.

"!)

_..

-,._-~-

_---

._.-,,~-_..:..~-l\----

-"---"--'--'-

Figure,5

Typical Frequency Response

_--

....

......

....

1-·

..;·..·

......

_-··

..··.. ·1

,'. ",

_._~

.. _ ...n,

...

~M-

'"(';"

10,:··

···

,·

;,..-

..·.:···,

"\'

:,'

...

':>

.....

....

'.'

..':

I " .,

("'!

,.;.1

I ,

,/1

I,'

1;'.1

-r.

.',

, ,

v-.

I·'

•

".1"

,,'

"J'

.,11 . ,,'

'..

"I !l

7.0. 8.0,

'.'

'6.0

.,'

../

','"

:f,'

-j"

i,'

II~"

'I,

".:,

,".

o ,

, I

1.0

2.0

3.0

4.0

\ . 'CURRENT (mA) .

.il/kure 4. Typical Sensitivity .

(Plotted with frequency constant)

'.'

. . .

the

plots

typical 35·dB

and

BO-dB

attenuation

chsracteristicsin

Figure 4. "

The

attenuation

with a

constant

forward-bias var-

ieswith

frequency. 'This variation is small

low

.',

. .

levels

attenuation

and more noticeable'at higher

.values

attenuation

(see Figure 5).

addition.Jt

'should

noted

that

attenuation

is.'

aminimum

. each

end

the'frequency

band.

Thus,

the

fre-

.quency band

canbe

exceeded provided a

dp~)a.da·

tion

attenuation

range as well

other

stecif'ica-

tions is acceptable. ,

Impedance

Ma·tch

The

PIN Modulator has a good impedance

match

, at. all levels

attenuation over Its frequency range.

This match is illustrated in Figure 6which shows

the

SWR

atypical PIN Modulator measured

under

both

zero bias' and maximum forward bias

conditions. Hence, with this

constant

match,

fre- .'

quency

pulli~g.

effects due'

the

PIN'Modulator

are negligible,

the

PIN Modulator is used outside"

specified frequency range,

SWR

chara~t;e.ristics

will

degraded in addition

other'

'ope~l~ting

specifi-

cations. .However, spurious responses can result

when, exceeding specified frequency

r$l1g

" I

,'1

Temperature Stability

...

.:.

I ,

'Ihe attenuation variationiwith applied bias

current

and

bias voltage at different temperatures

is'

illus-

.•

tt!ate~,

dOBver,~

l,ima1it0d't~anl;:

'e,

lin.

F~tg1·,I~e

,Atttenh'~la

\ Ion m.' . vanes mos

•.

In.ar y

~/.

curren ,W. 1e

variation

'\VitI,

voltage follo s an

alri;kost

perfect ex-

'",

.1._

'\'

"..

'.'

,',,\

'.{

··/·41··

:'\·:·,',

.......

'."

\',

".',

'.'

I; ,

;~\

;.'

.............

., «," ,

\..

...

I .'\

~DC':l~.;.;.....;,,

...............

:o...-

.......

~..-..:...-.....:.....~

_"'-.L..\-"-'

......

,~".~~

'" ":(

~:'

;1' 1,

,', ,

, I

.,.1

',1,;":,

,;'",

ill,

,;/

• j '. '

I,'"

:'l'

,I '"

"~I

.1 '

ponenti~l~~rve.

Ifa

c~nstant

vC?ltage"ls~aintained,'

",'.

',.a

,I'

the

attenuation

rises

.with

increasing temperature.

"'11"With

constant

current,

,the atten:uation"

drops!

'" ,I , : '

with

increasing temperature. The fact.

that

theat-

'i '

/.",

"tenuation varies oppositely ,with temperature

for

constant-voltage and vconstant-current operation

suggests

that

optimum

voltage

with

aselected

series resistor added between

the

..ource and

the

Modulatorwould

give

temperatu~ecomp'etisa~

tion

over

,a'

liInited;\;,H~rating

range. This compensa-

tion

not

built

into

the

PIN Modulator,

2.a

3.0

1 '

"'"

,,';'

,,,

1,1

'.I

) 'I I

,,r

, i

1.8,

2:0

2.4'

,FRE'QUENCY

(GHz)

, ,

()

o.a',

" '

1.2

",',

Fi,gu're

6. Typical8WR'of

a,'PIN

, " Modulator(87a2B) '

,',

LO+---~H"_-~---+__-,__+----+_

_+~

0.5

('j -I

,I"

.\(/

,P8g~',6'

, 'I

, ,

I_~'

"2.0

,.---r---j---,.---r-----:-:-r

, ,II:

,:'~'

I(J)

1.,5

iIl"',

~~""f__

+__-_+---'--+:-:--.,._._f----__It'"___i

;' "

! \' '

I '\

/,f.

1,1,'

,I,

I,'

, ,I

CLOSED

LOOP

LEVELING'

The PIN,Modulator can be used

i.n

aclosed loop

leveling system as

the

'power limiting device

for'

maintaining

power levels constant. A

simplified',

block diagram 'of a closed loop leveling system em- i

ployinga

PIN modulator,is shown in Figure

The

system consists

some sampling device which

samples

the

main line RF. power level: a detecting

,device .provides avoltage proportional Ito.

th~

sampledvslgnak some comparison device which

compares

the

detected signal

what

should'

when main line power is

its lowest 'point:',apd

then

provides 'a bias

current

sufficient

Increase

PINl\'lod\llator

attenuation and maintain acon-

stant

R}'power

level. .

'Leveling

Capab.il·ity.

aclosed-loop leveling sys-'

tern. involving a

P~N'

Modulator, Ieveling capability

.depends entirely

'upon

loop

equipment.' Hence,

GEI\JERAL'.

OPERATION

J'1'"

I"~

" ,

'I'hePtN

Modulators are three-port.devices ,whieh";,'':',:'

." accept RF

power

e,ither end-port and, depending

upon

the. BIAS signal applied, provide a.modulated

output'

the

,,'other end-port.

'As,

an operating

device"

the;

PINM'odulat<;>~

should

'thought

ofas

.a,

variableRF

attenuator

whose

attenuationlevel

is,

controlled

decurrent

and

voltage. By applyinrt", .

a+5

volt de potential to/the,;BIAS

inI;>ut

connector,

signals will

passed through

the

PIN)\1odula-

tor

with'

only

minimum insertion loss;By applying

acurrent equal

the-value'stamped

on'

the

instru-

ment

label

(at,

about

0.7

volts de) 'at

the

BIAS

input,

at least rated 'attenuation

provided

atall

points.

across'

the

frequency band (i.e.,' for

"A"

models

least '35 dB

and

for

"B"

modelsat

least

dB)~

Direct

cUITentat"a'neg~ti~'e~oltag'e'

is'

foro.

"'I'

ward-bias' arid typically is

about

5 rnA for,

"A"

models and 6

7'mA for

"B"

models. By

varying·

the

forward bias

current

between'

the

stamped

value and zero, any level below maximum rated

attern

can be established.

!\'j'

-0.9

, I

--+

..........

.....,,..,.,~,

---+,....---+---+-----1

0.3

"-0~4

,.',-0.5

-0.6

,..

0.8

BIAS

VOLTAGE

'(VOLT~)

21-,t--+----1"

-+-.;...

......

-t----t---J'--:Ir--~,t---_t

6i+--+...,.q.-

,,---+---+-~.t----+---i

',0.30.8

0.'"

,,1.2

,i.5

I.a

·BIAS

CU'RRENT

(mA)

1130A-I-;

iii

181-t---t--.,._._f---:.f'7-·¥-''-''-=-t----,-t----i

'0,

151'1"

--+-----I--#--+--+_._

.-t-----1

...

;:)

12·+----1-'--r--:tf--

...

9-t--~.._,..__t--+--,_+_-_+--.;

',"

Figure

Typica'l

Attenuation

Variation

'at

two

, D'ifferentAmbii!nt Temperatures'

,,',

,"',

_",I

','

:,~,..

,.'

)'1

I )

I;'

.', .;

, \ '. .' \ ,I

'Page

),.

'}"\

".'.

J' I

"oe

'POWER

SUPPLY

~6216A

t,'

",:

:MODULATED

SIGNAL

;t,·'.··,

I,',",

'.,

:',

'I':

I '

I,'

,~)

j " ' "

't'

d',' '.' '.1

...

300.n

,')

,','

, 1

PIN,·MODULATOR

" "

• ,I

'I,

I.,"

,I,., •

., '

\,,'

"I',

.' ,

I'"

i:,

, , ,I

II'

," "

,,' ":.\

' '

"",

MODULAtiON

),)'

SOURCE,

.....

UNMODULATED

RF '/"'."'

....

;

SIG'NAL'\<.'

lir-----ti-~

'."

1--_----_

I""

I','

. '

'I'

1,1

• ,

,/'.

quency

rates

always'

produce'

the

best.leveling.

,":.'

However to

determine

whether,

not

~riy

system ' " ../,

, , , • I \

is' leveling properly,

oscilloscope

and

,~lystal

,'.!.'

detector

should

used

!~h~

te~e~ed

RF'

output,

" I,' ,

.. "

"\'

" ':,

::'~ ~

, I J ' "

;1.,

~I)'

l ' ' "

\'. ' ,

I ',' t

',",

I'·'

'\,

'i'

I,.,

,.',"

l'"

','

't"''''

:"1' ,

-.....

, ,

,,1\

'I'",'"

i'l

LEVELED'

,POWER,

<,'

, I

,. "

,>,

I ,) " '

i "

LEVELE,O

"'RF

POWER

----

,:,'

,,'

,1,1

POWER

,METER

$432A,

DET'ECTING

D,~VICE

...u.--........,

~'\

RECORDER

OUTPuT

"',,

,'\

I: )

''i'

',?'

81AS

"".'"

20KO:HM

.'.

RESIS'rOR

"',

LEVELER

AMPLIFIER.

HOI-,84MA

'.'

',.,

,-,

;,1

'UNLEVELED

POWER

,:'

'I'

""It

'.:.,(:'

.::',:

•'

DIBECTlONAl

.)""""';",.,'.,,.',"

, ,

"i.

COUPLER

':'.,

,.<~7,9~n:,

J "

~FOR'

.P~CSE

MOOULATION:

~MODEL.~

~I~A,'

t'.'

"..'

,,"";

",'

,.'

",'.

:';'

I:'

':"':;:':

FOR

A~~LITtJ)DE.

'~1ODUb,~r.I()N:'\t)M9~EL6!5IB

Pigure'

'.,Typical

Clqsed

L~)'op

t~veling

S;istem',

.,'

Figutlj"lO)Typical,Genera/Modulation

~etup

, ' .. : ' , " " I,

) ,

"."',,

I,,"

"~'I

,,"I

I".'

"',

'.i

Fig~re,8.

!Sim,plified

Block

Diagram

Glosed

','"

, , .

i.Loop. Leveling System,',

It'

.,"'~

,~"''.

'::~

I',:,' I.

,','

',',:"

.: ,

,.,

1\;,1" '

,,.

I '

""I'

,i I

I .

1''''

"I,

-1

'I :,"

:' I"

'l,'

iJ, . ,

" ,J I" ?:

...

For'faste~

leveled swept frequency rates,

l~~gative

,output detector-and directional couplercombina-

tions

such

'as .the HP Model 7'86D

and

78·7D Direc-

.tional

Detectors

can

used insteadof

the

power

meter'

and ,"thermistor

mount

combination

.de-,

scribedabove.'Typically,'

for

the

directional detec-

'.,i'

tor

and. leveler campJifier combination, leveled

loop

equip~nen(should

be selected.

onthebasis

of. ' power can be

held

constant

within ±0.2'idB (plus

.main"line

R.F·

power. .levels and' leveling: .require-

fr~quency

'.'

response

directional detector).

ments.

III

the closed-loop system. shown in-Figure 9Note:Ithe,'

f~quency

response

the

directional

:the".~atnes~o..~

lev~1iIlg'i3

deteririi'n~d

primarily by

detector

includes coupling

;:variation,a~d,

re-

,,'.:' the,',co.\1plirig' variation

the

directional coupler spouse

the

crystal.

For

the

~~~~Jel

7,'86D

(0.96.

,,"

:used. l'he

powermeteris

usetr,Q'ecause

provides

2.11 GHz)

this

,is

I±O,;2"dB.

,,'

i ,

extra

190P gain. In' addition,

with

output

coupling

,'l(nQwl\;"'t,he' main

line'.output.power

can

be read

directly

the

powermeter allowing

for

coupling'

AMP~ITUDE

MO'DULATI'ON .

'variation.

The

'leveler

~pIU~.er

used

has

a, 0to,

'The

PIN' Modulator can be, used

amplit~de-'

-27,

Vdc

output..c~p~l,)i1ity

WIth

output

impedance modulate

the

RF' signal with

.almost

any

'time-

.""

about

'kn,

hence'

the

k,Q

"series resistor 'varYing signal. Modulation

'~~accompl,ished

with

•

::'"

'i,

makes it 'a

biascurrentsource

providing a

'maxi-dcblas'

'current.

obtain

a, specific attenuation

mum, L3S'

rnA'

decurrent

(referring

~igltr.e

"1'

"level and

thensuperimposi~ga

.time varying cur-

this means

tha,t'the

maximum control range

po~:

rent upon the bias current,

Th~

specific

attenua~

,sible

using 'an'

"A"

model

8730

is'between

l~'and

tion

level

~.tpon~"which

the

'modulating

signal

20 dB depending

upon

the

individualB'[Sf) used).. '.

"sllperHnp6$~d'

must

be equal

'greater..

than

the

Typically, with

the

power

meter

and

leveler

ampli-'

peak

amplitude

the,

modulating signal,

peak

fier combination, leveled

power

can be, held con-, ' 'clipping will

QC,<;\1r

."A

'¢ontroi

instrument

designed:

stant with ±0.2 dB,(plus coupler variation) for R'F

fQr,

use

'tn

modulating

applications with

~he

PH~"

swept 'frequency rates

equal

orlonger

.than

30'

Modulators is

the'

HP Model

8403A

M,odulator

',seconds/o,ctave.

'In

practice, slowest swept' fre- which provides'

frequency

compensation'

for

ex-

;'.

tending ·the.PIN Modulator AM frequency response .

. )

':':",

tolD

MHz. However, atypical

setup

for modula- '

J; , , ting applications, without. the use

the

HJi'

Model'

~1*P3A

Modulator.Isillustrated in Figure

10.'

• .

,',

\',

II,'

',I. .r.,

'',i'~:

I ',' I,.:

"It'

j,','

,,'

"·.:"··e'"

,(,

,I':'

1:- ;'

,'I'

I " I

\,\:

,I,

1,1:

l.'

, J

"}"

J , ,

I',

1._-

_..

_....:......._L._._~:..:..~.

__.. ._ ....J .__ .

....

• ..•

.. .. JJ I

",'

',',

, ,I

IiI

',I,

\ J

'.1 -, \..

""",:.'

, ,0

)i"

\.:; }

t ' \

r.:

j ,

''',

:.'

' I

.~\

;

..':,

,,.

3300

I."

.'\'

,',":

-.:

. ; ..,

OUTpUT

., I

....

i·iov

lI/,.lOA-C-1

.,.1,

, \ \,

\1"\;.;:

"---

•

, 1

,',.

)

il'

'\'

," "

,,'

,,360'

1,1 '

2000

10K

i'51<

")'

"II-

'.,",

'l,'

";"

.:'

,\ '

'./'

,!OOO

I,,'

, 1

\,\

·;:;20V

'.'

:1" \

J,I ,"

JI, .

.',

,I"

,\,

1',1

)

1'1

..',

,.)

","

a ,

',I'

.;",',1

i3Q

I,'

':'':'20'/'

I",

,,_

' ..

"r:,:::.'

')';,','

','1,

. .

NOTE

, ! \ ,

,I'

,properl).'

a£/jus(

the

input

~ivider,

slarr'bY,4Pplying

ground

the,

input,

,and

going

positive.

\ " I

"1)

'.'.

I ,

(c)

For,

fm,~d

adjustment,

observe

RF output

sig.

nal

and'adjustcircuitfor

f?PU:rhum

operation.

l , • ,

)t~~:>:·~'

.r:

',I' /

-f,'

.; "

';'j"'",I'/'

",',':/'.'

',:.'

~',

.:\1:,

't,'

',<,,:'>?

.':,'

:,'

(',

,'.

\,',

,')

"I,

.,j

,':'

JJ'i,ure

12B..

1'ypica/

Sh,QpiligCircuit,

"ft',',1 I.

,'\

. I '. , I ,

.',

I •

,,'

.I,i'

,,'

'I'

,.\

,,/

,.','

, i'

)

:.~

I+

,,'

.1 :.1 I, \

~t2V·

~.'

"1\ I,

" . ",I

.'"

.",,,,'.'

'.. ,, I ' , )'

,:i!

NOTES

';,

" "

P ALL

,~PN~"TR'ANS;IStCR~'ld'54~000'5

2,PNP

TRAN'siSTORS

185~'·'OQ09

',\

:~"

,'[>tOCES

1901

~,0627.

I,' ,

,','

.':"

,',

4;CIRC,l,lIT

GROUND

\'t1UST:'!Be;CO~MON

WmiplN:

MOQULATOR'

' ::

I,)

",' , 5,

:RE~hsT~NC~

"~OHl'S;">CAPA~'!iT~~C~

.. \ ",.,

<I!"

'n.MIC~OFA~AO,S

Ut:-l4E;S~~"

" ,

",1)'~!,:

I\"

::'

I:,"~',

OTH,ERWISf.

"INOICA:r.~":.',,,<

/,\

,':(,'

'I'

\' ,o' ) . I,' ," , "l , • '

'.'

.,' I

',;'

/i,'.',

,/\,

(',

'.',

.'/ ,'" I

'\'

I,'

" \ ) It', "

,'\

,. !'

",;

',,':'

.. ',

',':'

","

'l"'::!''1'(L\

\'1:,

'"I~,.'

':'I:~tw/c'ir~,~i't\

il~l~s,tl'ateit

~b?\re

,Will

typically

meet

2.,1

CttcuitArlju,GtrrtP.llt;'h:'"

.•.

:>:

.;th~(~:~~~~l~g

~~~f~~~,a~te

feat~~s:

: ' "

">',~~\l~~~~r:~~,:'~~~ft~e~~~:~~i~~t~n~:l~~~

,,<,':;)

"!,

)

,:,,(~)

rrhc"~«;Ji&hs(er

cheraeteristlc is within

2(r,j:"or

','

~:F':,~igQal::f~eq~~~~cy

of interest. /

'.'

. '\ i'.

"so

~t,/lh~~iir:

~'t

,1.S'OHz.

Slncethe PIN

Modl.d~tor:,,'

I.:

~~)iroadju~t~'

apply

voltage

the input

.and

,~!

:"atten;6ati~n'i

Ibias I

curr~nt

chararit~rbtic,

variJs ':'",,'

adjusit~e'alipropriate

potentiometer.

the input

"""',

" ,

"','\vl'dely.::,:II,"

' "

'\I,~!

',"

;:/

' " divider

as'

irJ,dlcated

for' the

"initi~l

'setup volt-

:,V

./,"

,I,

I,'r,',

,,"'"

'I' , "ages'

(s6~'Fig",ure'

12A).

,':(b),

The,;,

ban'~~id,t~"

'~,f

t,~e

circu~t

,limited'

.,"

~~out'

MH,~

'.<~odulating

signal,

frequency). I

)':J'~~a1.

ha~ti,~nic'd

isto~iionshould

gre~~~

,:~~~n'

'~B

dOW~1'

:,~

,:1

fl,

""1'1'"

, ,

j'I" ,

.li

,":

','t

il': \ \

,,(d) .

~~rp,,()p~r:,'drr.uit

opera~ion"

it:is

nec~ssarY

\':;

i"to.'

have

8~v,o~,t

signal

,the

base

()f

th~,input\

:,,~'~ansist?r',l8

~?!~ts',p,OS~~i;ve

re~ferenced:to

g!~~fl,~r

'J .',1,'.:'

",j

", : I

, I

,",

,\,"

Model '8730A &BSerieEr":"'

'>:

'' ' " ,

'.',

TURN

"OFF"

"TIME

TURN

i·ON"'

TIME

"~l

"1'

" I ' ,I I

',I

".II

lay

vee

I, ,

).. ..

\\.

!SV

I,',

"I, ,

'1, 't

--..

-3V

V-

••

-•,

, , ')1 I

Figure 13. Dynamic

Bias

Switching

Waveform

..":

','

",'

level with

the

.same PIN Modulator. This can

be'

,accomplished

simply

setting

aclosed loop

leveling

system

~~d

adjusting

the

reference

atten-

uation

level

£0

point

equal

the

peak

amplitude

the

d~sir~d

modulating signal.

For

.this

type

I.'

•

,I:

';,

,J,'}

_I:

•.

: ,

./. "

.!/ ,,) /

'{I,

,:,·,':'l~",:i'\/ii1':'

".,r !

(.""

'~',

"';

'i',

"",",i

',:1

.·.·",.1,

I,'

.',

.'! '

",,'

,:,','

,'I'

I I '

I •

I '.

'I,'

". '

..".,

)'.,

MUL

TIPLEFUNCTION"

FQr"

c~rtain

applic;.ations, /it .may be desirable

level and amplitude.

modulate

a given RF power

,I '

I,"

".:

Page

',:

) I .'

"...

',I'

. :

lor

a/maxinlum

attenuation.

',Once

maximum

at-'.

',; "

" ;:

'. , : .1 "

'....

~,'

tenuation

.level is established,'

the

RFpowe,r

may

\, .,

:be' pulsed

"on"

by applying .aconstant +5

.,' '

'::volts'

the

"BIAS

input

(voltage'

,ntist'

refer,; , :

".'

e~ce(r>to'PIN,Moduiator

ground).At~the·~~l(i

'o'f", .

.desired pulsewi,d,th,

the

,+5

voltdepotential

must

beswitchedto.a

-0.8

volt levelwithratedv

.bias

current

switch

the

off.

'i :

SrGNALSEPARATION

(GATING)

, j • " 'I ,

;'\

Figure

14!

illustrates

u~,

the

rI~{

.Modulator as'

...'

an·

RF gating device

for

eliminetlng' spurious or'

""gh'ost"'signals,in

antenna

range receivers.'

',i

,'"

To"

obtai~"p~lsing

with

rise'and

fall

'time~

~h~/

,,)'.

order

'to

nanoseconds,

the

PIN Modulator

rnust be biased with

the'

'Model

8403A

from, :

,",

,;!,,'

,I~

specially shaped' impulse

waveform'

sho~n"

in','

",F~gure

-13.

However,

rise

,and

fall times in

the

, 'I. '

.order

100

300

nanoseconds

aresatisfactory

,a'

, " \

'setup

such as is shown

Figure

may be used.

;i:',

~l'Q'te:

any

modulating system,'modulating capa-

bility depends upon

the

modulating waveform'

the

BIAS

'input

·cQnnectQf. Hence,

lead,

lengths

. 1 . ,

should-be as

short

.aspossibleto

avoid capacitive

,.cable effects. .i. ' .

",.

II,

I,'

>,'

.',

J " .•

I •

}

I -, ,)

\..,

, J

.", .

I; , ,'.

,,"

','I

". ,

,','i

, I' •

. , TO

RECEIVER.

PUt'MODULATOR

'1 t2

,.' I

I I

,.nu.

DESIRED

:<',)

S'IGN1AL

,PATH.

'AEFlE(;T1

I.'

OBJECT· ,

~1"

/',

I,"

SPU~'OUS

,/ .

.....

SI:~NP\L

,/ "PATH

;I. .

'\\

........

_~,

l'~+-~"""~

II"

PULSED"

"TRANSMITTER

SYNC ' (

'II

f'.';

",'

.'."',

III

ii,

)

l';':,:,r

'-'

'e"

,.J

.""

,1,'[

.' .

'\.'

-,', tI .

•

) , i .

)

tl\

I I

,,:,'

"41

TURN"ON"

SIGNAL

" I

, I

tl'2

'1:)

',.1

_.'

--~-

~~~-~~~._-----------

_.------'-------~.

.,-'

..,

i.1

...

, .1

.:1

)

'.;.'

", .'.

!",

fl I " '

,,'

.,"

•

',;'

':".

J " )

,j,j?igure,14.

Typical'U~eof

~odu.latpr

an'R.-F'"

Gating

Device

,,'

, I,"

··_·:'Y;'· T' ,

, I

'J""; :",1,

",i:.I

,,',.

..:

'."

', '

'i "

~,'

,'I'

, I

,l"

"1'

,,,'

,I,

, I

\\,

'" "

,,'

,,J>

I,'

'1\

I '

"I,

,I'

','

,,/

'!'

,;,

,':

'"I'

',I

,I,

<,'

t '

\',

'",

! '

,I,

",'

,\'J

.,1'

~'i"':';','

\,.

(','II'

",I

','j'

,'"

,', , I' ,°'1 '

,',

'",

'. -"

~,-

.-"

I '

_~r

-..

---

....

_---

",,".

, >

,,"

"~I,

Page·11

., '.

DESICCANT

'9240-0007

RETAINING

SPRING·

1460-0213

Figurels.

Dessic~nt

Assembly

NOTE

'Desiccant found on 8731A thru 8,735A,

and 8731B thru 8735B with

serial

prefix

815-

ESCUTCHEON

,0'8731-2028

...

RETAINING

SCREW

08731"'216 '

'Test

Equipment

Required.

The test equipment re-

quired

make the performance tests are listed'in.

Table 3..Instruments and'accessories

other

than

the

ones listed may be used provided

their.

perfor-.

mance equals or exceeds the Critical Specifications.

tests areperforDled'withou] access

the

PIN Mod-

ulator 'interior; .

there'

is Ino need

remove PIN

.Modulate»

f~r··

performance checks. The specifics- ,

tions

Table .1 are

the

performance .standards.

,I, " ,1

Checking

Dessicant

.Inspect desiccant regularly (Figure

15).

and, if it is

pink

~r,

red in color, either

~'\~move

and dry it

re-

place It'.

, ,

\ 1,\ I

.Performance

Che'cl<

~orpose.

The procedure detailed, in Table 2checks

PIN,

Modulator performance for incoming inspec-

tion, periodic evaluation.jmd troubleshootmg, The

Bias

Input

'Check

and

Repair

11\

part

the

bias-input assembly (Figure 16)

is 'damaged,

can be replaced separately. However,

'it is good

practiceto

replace,

the

entire assembly.

. To 'check bias

input

assembly, remove.

the

;PIN

Modulatorandm~asure

its resistance with an

, ' I '

ohmmeter: straight through

the

filter resistance

shouldpe

less'

than

5ohms; resistance between,

':QNG

center

conductor

and 'shell should be infinite.

"' ' ",'

:./:.~

,,/ ,

l,,'

, I'

-,I

"e.'.···'·

,..

'f',

!.(~'

.'\

RETAINING SpRING

1460-0213

ESCUTCHEON

0873l-2028

,CONTACT*

08731-206

FILTER

BODY*

08731-20;4'

(8731/32)'

08733-225

(8133/34/35),

*PART

fiLTER, BIAS

ASSEMBLY

08731-600

(8731

AND

8732)

08733-~05

(8733,8734,ANO 8135)

CAPACITdft,

FIXEQ*

08731-2027

,SOFT \

SuLDER

CONNECTOR,

Bi~~C*""

&PR'NG~

1250':'O!~5"

COMPRESSION

1'460;~O'212

\,.

/':.' '

i';gurc'16;

Biasinput Assembly

itt".'

:',',

,,",1

',',':

,.',

'.."

':1

I' \

'~.

r .'

,1.

'LEAKAGE CURRENT.

<When

back-biased

typica11~

less

than,50J.t4

for

"A"

models

and

typically

'lesstlian

lQO

for'

"B"lnod~ls

(see

Not?

4). . '

.'"

( . . '," ;

,'i

r-'~

, I

;; / ,i ,

Tablei2. Performance CheckProcedure

'(1,'of3)

,,"

'\,),

1'1'"

_<I

.•

,,.

,'I

, ,I '

/ I

s :

Mddel

8730A

Series

, II .

,ii,

,I,

,.'

ii,

'-",,'

,','"

'? '

',.,/

,'.

, I

Page 12",

v.'.

, ' I ,/ •

DYN'AMIC

R~NGE

(dB)., .For ','A" models

(9NLY)at

35 dB across frequencyrange

i:,

~'1

\,,

lao.. .

Voltmeter.

used

PIN Mod Serial

No'~'_.,_.....;....

......

Measured de Voltage

TEST

RESULTS (see Note 1),

'Date

-,-

.PROCEDURE

\," " I

Apply +20

voltsde

(re(eren~ed

PIN Modu-.

lator

ground)

the

BlA,S inptit through a10Q

...

'10%

1/4W

resistor.

. b. Using ade

voltmeter,

'measure voltage across

'resistor.

For

"A"

models less

than

5V (less

than

'I,

, , '

lOV

for

"B"

models).

, c.

leakage!current'is excessive,

the

cause is

.,.

either

adefective BIAS

input

filter (see paragraph .

entitled

Bias

Input

Check and Repair)

internal

·dam~e.

' ,

PROCEDURE ,

',,

a.' With, 5"Vdc

appliedto

BIA,S

input,

attach

a80-dB

attenuator

PIN Modulator RF

output.

,I \ ,

Ib. Using a Power Meter, adjust

power, source

fot

anear full scale reference.

Turn

off

Power

Supply

and

reconnect

Modulator

shown

'on

page. Adjust Power

Supply

for

rated current (stamped on label, .

attached

underside

Modulator).

, d. Remove.

"30-dBattenuator

and'measure at-

•tenuated

power level:

should be

least 5

dB lower

than

original reference setting,

TEST

RESULTS (see Note

Date

....;..,

, _

Mod Serial(No.

..;...;._~----_·

Attenuation

~------

Frequ~ncy,_-----------

Power

Meterused -:-- _

Measure forwardIbias current

-----

3. DYNAMIC RANGE (dB).

,For"B"

models (ONLY) 'at least' 80

dB~

,\ -.'.

I "

Date

~-~-----

PIN Mod Serial No. _

PROCEDURE

.'.

Set

Spectrum' Analyzer

INrUT

ATTENUA- '

TOR

dB and

connect

test

equipment (N01'i

INCLUDING THE DC POWER

SUPPLY

OR DC

AMMETER)

shown beneath step,c.

t-----------:---------.....;...----r------~----./~

---------:-----1

TEST

RESULTS

(self~,INotel)

)

",-

,,.,

I .

Frequency

Attenuation

---

Measured

forward

bias'circuit _

Atteunator

used _

.~.,',\

For

testing the 8733B, 8734B, or 8735B

TWT,Amplifier must beused as

part

the

Source.

Be earefutnotto apply

, 'more than 1W

R~i,)pwer:to

PIN.

Modulator,

•

. '

, i

II'

I \ •

b. Apply +5V

(referenced in PIN

Modu

Jatar ground)

BIAS

input.

' ,

1-)

'r, \'

.'--~_._.,-

,'.

Page 13'

Table

.Performance

Chec'k

Procfedure

Set

Spectrum

Analy~e~.

vertical display

switch for 10dB logarithmic display. Adjust

Source and Spectrum Analyzer

foraconvenient

deflection reference onanalyser display.

"..' ,

,,'

i •

•

,,'

".'

-J

Model·

8730~":~\':B··Series

..,

I',.

',';

,',

:.\

.'.

-'.

e!5A

SPECTRUM

ANALYZER

A.METER,

(*410CDC

VOLTMETER)

f)62t'6A.

PulER

S,UPPLY

.d. Turn'

off

de Power Supply and connect

with de Ammeter as shown .

;' i '

I "

I I ' .. '

j , ,

" e. Turn on dc Power Supply and adjust for

rated current (stamped

underside

PIN "

,Modulator). '

~,.

I\RFSOURCE~ATPTER~

~~.

....

.I.

MODULATOR

'*8NC-TO~8ANANA

POST

ADAPT.ER

*IOIIOA

",.'

.", ",

.,W'

'.J

,'.

,t.

Decrease Spectrum Analyzer INPUT AT

TENUATOR and increase

GAIN controls

for'

atotal increase in sensitivityof 80

(i.e., de-

.creasing the INPUT ATTENUATOR from 60

30.

dB and increasing the

GAIN control from

20'to 70 dB is atotal increase in sensitivity

of-

80 dB). Specification:

input

signal deflection

must beless than reference

step c.

...

~",

!~~

at~

J:lF.

power is

being

applied.

the

,:Srectrum Analyzer

TTENUATOR must

setto

in step

.,'

.. . It

,,'.

1.8:1-

8733A'& 8734A

2.0:1

8733i:f& 8734B

1.7:1''-

8735A

2.0:1-

8735B,

When reverse-biased, less

than

'1.5:1

~731A

&8732A

1.6:1 - 8731B '

~:~;~

8732B

(See

Note

'2)

':1

r.'

I : I

, i

4.SW,R.

)

,',

i·

•

~;.

, 'I:

'\""

"" y ,.

1iIt,

I.,

t',·

!I' • '

J\,Jod~l.

8730A'&

Series

""'

•

I',

Table 2.PerfofrY1:ance Check Procedure

o(3)

','

I \

PIN M()d Serial No._·

.........

TEST

R~SULTS

(see

Note

'1),

, 'I,

Date

......-

SWR

ata

frequency of..;...._.

,PROCEDURE :

a.With

+,5

Vdc (referenced

PIN Modu-

lator ground)'applied

BIAS input measure

SWR

each end

the

specifiedPlbl Modula-

tor

frequency range

and

optionally

any

other

points'of interest.

SWRis excessive, remove PIN

Modulator,

,from setup and clean R,Fconne'ctors

any.dirt

other

foreign

matter.

Repeat SWR measure-

ments, 'I,

)

5. ,SWR. When forward-biased, less

than

1.8:1-8731A&8732A'

2.0~1

8~3iB

8732B '

2.0:i.-8733A

&8734A

2.0:1 -

8735A

2~2:1

8733B &8734B

,2.2:1 - 8735B .

PROCEDURE

"TEST

RESTILTS (see Note 1)

a. With a de'voltage

about

-0.7

volts and

'rated current (stamped

label·--·

undersidejap-

,Date

....;....

_____

,plied

BIAS input,

measureSwlt

ends

specified frequency range. 'PIN Mod Serial

NO.

.r---

SWRis excessive, clean' RF

input

and out- SWR

afrequency

put

connectors and

recheck.

, '

I'" .Measured forward bias

current_~

6. MINIMUM INSERTION LOSS (dB).

,When

reverse-biased, less than:

I ,

1.5

dB -

8731A'

2.0

dB - 8731B, 8732A, 8733A

,3.0

dB - 8733B

3.5

dB &4.0 dB - 8732B (See Note 3)

4.0 dB 7- 8734A &'8735A 5.'0

-8734B s8735B

PROCEDURE

a. With +5 volts. de applied

BIAS

input,

"measure insertion loss

high end

frequency

band and all

otherjpointsof

interest.

TEST'RESULTS (see Note 1)

Date --:-

.PIN Mod Serial No..

-------'-~---

'1 "Insertion Loss at,afrequency

NOTES

, I

\',.'

:.'

,4.

,The leakage current, although not an actual speclfl-

cation, is the only method

checking diodes for

leakage and general condition",

5. To check riseandfaU times aSamplJng Osclllosope

suchas

theHf'

Modell8llA/1430C

should be used.

6.:Typical Forward

Bias

Input Resistance

may

be calcu-

lated by applying 3 or,4milliammeters of dc current

at a negative potential, measuring the negative poten-

tia~.

For

,"A" model PIN Modulators, it is approximately

300 ohms

±lOO

ohms; for

"B"

model PIN Modulators,

,it is approximately

100

ohms ±50

ohms,

1. The test resultscolumn-provided opposite each test

proc~~ure

isnot provided

'to

allow acomplete

test

, . , '

record but rather

toallowtest

result comparisons.

'for aspeelftc

PIl\JM~dulator

measuredunder' the

same conditions at,

diffe~nt

time

tntervals,

. ,

WhenrevelSe-biased~

the

SWR

the

873213

should

be less than

1~6:

i',eor

frequencies

betwee~l

1.~

and

4.0 GHz and less than 2.0:1

betwe~n4.0

and

4~5

GHz.

" . ,

3. Minimum

in~l1ion

loss.for

lh~

8732B\is less than • '.

., 3.5 dB for

RF;

frequenCies between-l.8 and ,4.0

GHz,

I .

and less·tban'4.0 d:Bbctween,4.0'ahd4.5

GHz~

,,"

L-

.....

......

..;..._~

~-'-----~-----------~

......

,I , " I

• f

. I

...

._.

~___

_ ,....--

--L-.-

----

---

-------,-----........------..

----------

.''ModefS730A &'B,Series

e,··

, I '

,Recom",ende~

Model

Check

I',

~quipment

~orAIl

Models

I·

Critical

Specifications

\.'

1'abl~

~~commended

Test.

EqUiPm~nt

•'

.-,"

',I,'

Power Supply

Output~:±0.2

to'20 Vdc

" ±0.5 to 10 rnA

Impedance:

lOon

All

, HP

621.6A

Voltmeter

and

Ammeter

Voltage Range: ,±3 to 20 Vdc

, Current Range:

0.5

to t'OmA

Accuracy: i

All HP

4'10C

SWR

Meter

and

Crystal Detector

Frequency: of PIN Modulator, modulated

at 1000 Hz

±2%

rate

Calibration:' Square Law

Frequency Response: ±0.5 dB

Accuracy:

±1%

Minimum Insertion

Loss

HP415E (Meter)

and

HP423A (Det.)

Resistor 100 kn1/4W10%

Leakage

Current

--t

RF Source Frequency:

Modulator,',

Residual

FM':

<50

kHz

Power Out: 3

Equipment

for

"A"

Models

Only

All

(except

leakage,

current), H614A'(8731)

8616A (8732)

8690B

869~B

Opt.l00,(8733)

8694BOpt.

100

(8134)

86~4B

(8735)

RF Attenuator Frequency: of PIN Modulator

Atten: 30dJ;J'

Accuracy: ±2 dB

Dynamic Range . HP8491A Opt.030

(all

coa~ial

models)

X382J\

(8735A)

Power

l\1eter

Power:

upto

Frequency:

PIN Modulator

Instrument. Accuracy:

±3%

Calibration:

roW

and dB

,Dynamic

Range

HP432A (Meter)

478A (Mount

8731A

thru

8734A)

HPX486A* (Mount

8784A/8'735A)

Equipment

for

"B"

Models

Only

PowerMeter Frequency: of PIN Modulator

Power: up to

Accuracy:

±6%

DynamicRange HP

t135A

Power Meter

and

HP8481H PowerSensor

. .,

Spectrum Analyzer ",Frequency:

oCPI,N

Modulator

Calibration: logarithmic

i,n

dBI

Sensitivity:

"';'90

dBm

(-65

dBm for

8733B/348/35B)

Dynamic Range HP 8565A ,

"'Note:,

For

use with

8734A.

X28.1A Coaxial

waveguide

and

amale-ta-male

type

adapter

must

be used,

'. '.

Microwave Amplifier .Frequency Range: 0(,8733B/34B

35B

Power Out:

from 1

input Dynamic Range ,

491C (8733B)

493A (8733B)

HP495A (8734B

, and

873~B)

','

I .

i""

Me Db '.

.....

"\.',

'.'

I';·

,,.

,t:"

s ;

'.'

" 'I

I .

• 1 t-'

,.1

'.'

'I'

\Ii

'\ \II

.; II'

,:,

i '

-t'l

:.1

,',

}.;

,11'1,

,,.

"'Page

'I"

•

,j IModel.8730A &B

S~ries

r ' ,

!,'

'f,

't,

\ 'I

l •

APPENDIX

BACKDATING

,UA

CHANGES

,MODEL"SERIES 8730A &B

PIN MODULATORS

Make all backdating corrections

this manual .accordlng

changes below.

M k M I

S.r' I P

N b '

13 re IX

urn

er ae

anua

anges._

M k M n I Ch it

I P f"

ber

e la re IX m a et- aua an

es_

I" 8731-5B: 815-

A,B

8732A: 816- 'B "

....;

.',

,'I

CHANGE /-\

Paragraph 41 and 42: , ,

.".

Add desiccant, stock no. 9240-0007; Escutcheon, stock no. 08731-203; Desiccant retaining

screw, 08731-216. "

Change bias input escutcheon stock no. 08731-2028

08731-203.

CHANGE B

Table 1, SWR Specifications: .

Change

SWR

specification from

"1.8,

from

1.8

to,4~0

GHz; 2.0,

f;rom

4.0

4.5 GHz" to

441.8,

from 1.8

toA.5

GHz".

, I

/' '

/,,

,,,

This manual suits for next models

Table of contents

Popular Modulator manuals by other brands

ANTIhum.com

ANTIhum.com CCT818 instructions

Channel Plus

Channel Plus 5214 user guide

Televes

Televes 585915 user manual

Advantech

Advantech L-Band Satellite Modulator Installation and operation manual

Televes

Televes 5806 user manual

ITS Telecom

ITS Telecom EKSELANS MD HD EASY user manual

FMUser

FMUser FUTV3506 user manual

RF RFT-856HD user manual

Williams Sound

Williams Sound MOD 112 Installation guide & user manual

ClearView

ClearView HD168Bi user manual

Pico Macom

Pico Macom PFAM550MT Installating and operation manual

Farenheit

Farenheit EFM-01 owner's manual

Sennheiser

Sennheiser SI 30 Instructions for use

Terra

Terra TDX440 instructions

ITS Telecom

ITS Telecom EKSELANS CM COMPACT 8S4 user manual

Kenwood

Kenwood KC-Z1 Setup guide

IKUSI

IKUSI MHD-201 Programming guide

Pico Macom

Pico Macom USM-20D3 Installation and operation manual

HP 8731B Service manual

Popular Modulator manuals by other brands