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Hallicrafters SR-160, Техническая информация

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TECHNICAL SUPPLEMENT FOR THE SR-160 & SR-500  by WDØGOF August 2010 

19 

SR-160/500 NEUTRALIZATION PROCESS 

 
 

PROPER  NEUTRALIZATION  WILL  ENHANCE  THE  PROPER  OPERATION,  EFFICIENCY  AND  LIFE  OF 
YOUR  FINAL  TUBES.  THEORY  AND  OPINIONS  ON  THE  EFFECTS  OF  INTERELECTRODE 
CAPACITANCE ARE AS NUMEROUS AS THE WRITERS OF SUCH ARTICLES. SO TO BE VERY BASIC, 
WE  ARE  ATTEMPTING  TO  NEUTRALIZE  THE  EFFECTS  OF  THE  INTERELECTRODE  CAPACITANCE 
OF THE PA FINAL TUBES. 
 
HERE IS A GOOD SITE FOR A DISCUSSION ON NEUTRALIZATION.  

HTTP

://

WWW

.

W

8

JI

.

COM

/

NEUTRALIZING

__

AMPLIFIER

.

HTM

 

 
THE

 

NEUTRALIZING

 

PROCESS

 

IN

 

THE

 

BOOK

 

IS

 

OK,

 

BUT

 

NOT

 

VERY

 

PRECISE.

 

IT

 

WILL

 

WORK,

 

BUT

 

I

 

PREFER

 

A

 

MORE

 

PRECISE

 

PROCESS.

 

THERE

 

IS

 

NOTHING

 

NEW

 

OR

 

REVOLUTIONARY

 

ABOUT

 

THIS

 

PROCESS.

 

IT

 

IS

 

A

 

PROVEN

 

PROCESS

 

THAT

 

HAS

 

BEEN

 

IN

 

USE

 

FOR

 

OVER

 

50

 

YEARS.

 

ALL

 

I

 

HAVE

 

DONE

 

IS

 

SPECIFICALLY

 

ADAPTED

 

IT

 

TO

 

THE

 

SR-160/500.

 

BEFORE

 

STARTING

 

THE

 

PROCESS,

 

YOU

 

NEED

 

TO

 

TUNE

 

THE

 

TX

 

AS

 

BEST

 

AS

 

YOU

 

CAN

 

AT

 

21.3

 

MHZ.

 

AFTER

 

TUNE

 

UP

 

TURN

 

THE

 

POWER

 

OFF

 

AND

 

DO

 

NOT

 

RE-ADJUST

 

THE

 

PRESELECTOR

 

OR

 

FINAL

 

TUNE

 

THROUGHOUT

 

THIS

 

PROCESS.

 

POWER

 

DOWN

 

AND

 

REMOVE

 

UNIT

 

FROM

 

IT’S

 

CASE

 

AND

 

REMOVE

 

THE

 

PA

 

COVER.

 

 

 
1,

 

DISCONNECT

 

THE

 

PLATE

 

VOLTAGE

 

AT

 

THE

 

BOTTOM

 

OF

 

L16

 

BE

 

SURE

 

THE

 

LEAD

 

IS

 

OUT

 

OF

 

HARMS

 

WAY. 

 
2,

 

DISCONNECT

 

THE

 

SCREEN

 

VOLTAGE

 

AT

 

THE

 

BOTTOM

 

OF

 

R102

 

BE

 

SURE

 

THE

 

LEAD

 

IS

 

OUT

 

OF

 

HARMS

 

WAY 

 
3,

 

TURN

 

THE

 

CARRIER

 

FULLY

 

CCW. 

 
4,

 

CONNECT

 

THE

 

TRANSMITTER

 

OUTPUT

 

TO

 

THE

 

SCOPE

 

OR

 

TO

 

AN

 

RF

 

VOLTMETER

 

(I

 

PREFER

 

A

 

SCOPE). 
 
5, WITH

 

THE

 

CASE

 

REMOVED

 

AND

 

THE

 

COVER

 

REINSTALLED

 

ON

 

THE

 

FINAL

 

AMP

 

ENCLOSURE

 

TURN

 

ON

 

THE

 

RIG

 

AND

 

LET

 

IT

 

HEAT

 

UP

 

FOR

 

AT

 

LEAST

 

20

 

MINUTES. 

 
6,

 

IN

 

THE

 

CW-TUNE

 

POSITION

 

KEY

 

THE

 

TX. 

 
7,

 

ADVANCE

 

THE

 

CARRIER

 

CONTROL

 

UNTIL

 

YOU

 

GET

 

ANY

 

WHERE

 

FROM

 

1

 

TO

 

5

 

VOLTS

 

PP

 

ON

 

THE

 

SCOPE. 
 
8,

 

ADJUST

 

C110

 

FOR

 

MINIMUM

 

SIG

 

ON

 

THE

 

SCOPE.

 

ADJUST

 

SCOPE

 

SENSITIVITY

 

AND

 

CARRIER

 

LEVEL

 

UNTIL

 

YOU

 

GET

 

A

 

REAL

 

GOOD

 

PRESENTATION

 

OF

 

THE

 

MINIMUM

 

POINT. 

  
THIS

 

PROCESS

 

OF

 

NEUTRALIZATION

 

HAS

 

SERVED

 

ME

 

WELL.

 

THIS

 

PROCESS

 

CAN

 

BE

 

ADAPTED

 

TO

 

MOST

 

ANY

 

TRANSMITTER.

 

THIS

 

IS

 

THE

 

MOST

 

PRECISE

 

METHOD

 

OF

 

NEUTRALIZATION

 

I

 

HAVE

 

FOUND.

 

IF

 

IT

 

DOESN'T

 

WORK

 

THEN

 

YOU

 

HAVE

 

SOMETHING

 

ELSE

 

WRONG. 

 

Содержание SR-160

Страница 1: ...SUPPLEMENTAL TECHNICAL INFORMATION FOR HALLICRAFTERS SR 160 AND SR 500 TRANSCEIVERS The little radios that could STUFF NOT IN THE BOOK By WD GOF August 2010 updated 9 30 2012...

Страница 2: ...ollection of the full production SR series HF transceivers in operation in the shack There are 7 full production rigs in this series and I have restored many of each from the 100watt SR 150 to the 100...

Страница 3: ...ION 10 THE S METER 11 S METER AMP TUBE SELECTION 11 AGC CONSIDERATIONS 11 MISC NOTES 12 TUNING FOR PLATE I DIP 12 RX RF AMP MOD 12 RIT CAL 12 SR 160 500 DRIFT 13 CAL RIT CIRCUIT CONSIDERATIONS 13 RIT...

Страница 4: ...and it is a single conversion receiver The xtal filter in the 150 is 1650 KHz and 5200 KHz in the 160 It is a tri bander covering the complete 80 40 and 20 meter ham bands Power input of 150 watts for...

Страница 5: ...tube and the 100 KHz crystal for the crystal calibrator were extra cost options installed in this set In comparing the schematics for the SR 500 and the SR 160 only a few differences are noted R92 is...

Страница 6: ...input power was used Unfortunately they did nothing to the VFO and as the little tri bander accumulated hours it became drifty again Later in this writing we gonna fix that SR 500 finals Hallicrafters...

Страница 7: ...120 HZ hum A keyed 2 wire cord should be used On the PS 150 the wide pin the neutral wire of the plug will connect to C202 The narrow pin connects to the fuse Use the same format for the PS 500 Capaci...

Страница 8: ...he oscillators on freq individually then all else will fall into place Do not make any adjustments until the rig has been on for at least 30 minutes Do the VFO last to insure it is stable HETERODYNE O...

Страница 9: ...t and output coils first Then tune the receiver antenna coils When aligning the antenna coils tune your signal generator to your VFO setting don t tune the VFO to the generator The procedure in the ma...

Страница 10: ...arrier osc after passing through the lattice filter in the transmit mode Prior to performing T3 alignment 8 16 in the manual insure that the 5200KC oscillator is exactly on frequency After aligning th...

Страница 11: ...l produce a meter reading of S9 pretty broad spec S METER AMP TUBE SELECTION V4B is the Meter amp Unfortunately as stated above the other half of the tube is the second IF amp The meter amp ckt is ext...

Страница 12: ...A difference of just a few cycles can cause you to walk up or down the band When the RIT function is turned on the transmitter is still controlled by the CAL control but the receiver frequency is var...

Страница 13: ...hy it takes longer for the 500 to stabilize after turn on If you operate in an uncontrolled environment such as field day in the fall chances are it ll never stabilize If you stick with the 1N963A the...

Страница 14: ...directions from the mechanical center of rotation then R98 is at fault Now return the CAL control to the mechanical center and readjust the main tuning for 9 000Mhz Turn the RIT control ON Adjust RIT...

Страница 15: ...on for the 0A2 150v regulator When you monitor the voltage at the input to the VFO you may see from 5 to 15 volt shift from TX to RX mode This will pull the VFO off frequency in the tx mode and cause...

Страница 16: ...changes I re ran the test The short term random drift was gone All three rigs were then drifting in the upward direction from 10 to 30 HZ per minute and around 800 Hz to 1100HZ per hr SECOND CORRECTI...

Страница 17: ...ct 0 1 volts of 5200 kHz into pin 7 of V5 Retune the RF gen for max audio If you get watt or better of audio out then the problem is in the second IF amp V4 If not go the STEP 4 STEP 4 Using a tee con...

Страница 18: ...set up the VOX gain and delay The oscillation on this one turned out to be about 18 kHz which is out side the range of my old ears and the response of T5 So the tone did not appear in the speaker Why...

Страница 19: ...3 MHZ AFTER TUNE UP TURN THE POWER OFF AND DO NOT RE ADJUST THE PRESELECTOR OR FINAL TUNE THROUGHOUT THIS PROCESS POWER DOWN AND REMOVE UNIT FROM IT S CASE AND REMOVE THE PA COVER 1 DISCONNECT THE PL...

Страница 20: ...nd 3 16 wide Place a drop of DeOxit on the paper and slide it back and forth between the contacts Manually energize the relay and clean the normally open contacts as well A pair of hemostats simplifie...

Страница 21: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 21 BEFORE CLEANING CLEAN CHASSIS...

Страница 22: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 22...

Страница 23: ...d at center of General Class bands BAND TEST FREQ SIG REQ FOR 500mw 80 40 20 Overall Sensitivity S N N A 1 0uv signal at the antenna terminal will produce a minimum 20db s n n BAND TEST FREQ SIGNAL LE...

Страница 24: ...t CW power output with RF level set just to saturation level FREQ MIN SPEC AVG POWER 3 9mhz 190 W min 7 23mhz 220 W min 14 28mhz 200 W min SSB PEP power output mic gain set just at saturation SSB TX A...

Страница 25: ...General Class bands BAND TEST FREQ SIG REQ FOR 500mw 80 40 20 Overall Sensitivity S N N A 1 0uv signal at the antenna terminal will produce a minimum 20db s n n BAND TEST FREQ SIGNAL LEVEL S N N MEAS...

Страница 26: ...signal level not more than 5 mv rms shall produce the minimum specified SSB output at specified freq Mic gain set just below flat topping and should occur between 60 and 80 of rotation Flat topping o...

Страница 27: ...Not wanting to risk a rig or run a power supply without a load I built this test fixture It was specifically built to test the PS 150 PS 500 and P 500 AC and DC power supplies However with the properl...

Страница 28: ...TECHNICAL SUPPLEMENT FOR THE SR 160 SR 500 by WD GOF August 2010 28...

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