Eico 753 Manuale utente

753/Tri-Band SSB/AM/CW Transceiver

753

Rev.I

GENERAL DESCRIPTION

The EICO Model 753 SSB/AM/CW Transceiver incorporates a filter type single sideband trans-

mitter and a single conversion superheterodyne receiver for operation on the 80, 40 and 20 meter

amateur bands.

is equally suited for mobile and fixed station use.

In fixed station use, the Model 751 AC Supply/Speaker Console (117 VAC, 60 cps) is required

for its operation. In mobile use, the Model 752 DC Supply (12 VDC , positive or negative ground) is

required. Both supplies have been designed integrally with the 753 and provide the requisite filtering

and regulation. They can not be supplanted by supplies of other manufacture

the design capabilities

of the 753 are to be obtained.

FEATURES

SPECIFICATIONS

o Full band coverage on 80, 40 and 20 meters. o Receiver off set tuning (up to ±lOkc) without

altering transmitter frequency. o Built-in VOX. o Panel selected VOX, PTT

STANDBY. o High

level dynamic ALC to prevent flat-topping or splatter and permit the use of a linear amplifier. o Auto-

matic carrier level adjustment on CW and AM. o Dual ratio ball drive per mits single knob 6:1 rapid

tuning and 30:1fine tuning (over 10 degrees of scale). o Position of hairline adjustable on panel.

o Illuminated S-meter/PA Cathode Current Meter and tuning dial. o Fast attack, slow decay AGC.

o Grid-block break-in CW keying. o Product detector for SSB and CW, triode detector for AM. o TR

relay with auxiliary contacts for use with high power linear amplifier. o Includes mobile mounting

bracket.

ADDITIONAL SPECIFICATIONS

FREQUENCY COVERAGE: 3490-4010kc, 6990-7310kc, 13890-14410kc. SSB EMISSIONS: LSB 80

and 40 meters, USB 20 meters. RF POWE R INPUT: 200 watts SSB PE P and CW, lOO watts AM. RF

POWER OUTPUT: 120 watts SSB PEP and CW, 30 watts AM. OUTPUT PI NETWORK MATCHING

RANGE: 40-80 ohms. SSB GENE RATION: 5. 2 Mc crystal lattice filter; bandwidth 2. 7kc at 6db.

STABILITY: 400 cps af ter warm-up. SUPPRESSION: Carrier-50db; unwanted sideband-40 db.

RECEIVER: Sensitivity luv for lOdb S/N ratio: selectivity 2. 7kc at 6db; audio output over 2 watts

(3. 2 ohms). PANEL CONTROLS

CONNECTORS: Tuning, Band Selector , AF Gain, RF Gain, MIC

Gain with calibrator switch at extreme CCW rotation, Hairline Set (capped), Mode (SSB, AM, CW,

Tune), Function (Off , Standby, PTT, VOX), Carrier Balance, Exciter Tune, PA Tune, PA Load,

Receiver Offset Tune, MIC input, phone jack. REAR CONTROLS

CONNECTORS: VOX Threshold,

VOX delay, VOX sensitivity, Anti-VOX sensitivity, PA Bias adjust, S-Meter zero adjust, power

socket, external relay, antenna connector , key jack, accessory calibrator socket. ME TERING: PA

cathode on transmit, S-Meter on receive. SIZE (HWD): 5-13/16" x 14-1/4" x 11-1/4". POWE R

REQUIREMENTS: 750 VDC at 300ma, 250 VDC at 170ma, -100 VDC at 5ma, 12. 6 VAC at 3. 8 amps.

INSTALLATION PROCEDURES

WARNING

LETHAL HIGH VOLTAGES ARE PRESENT WITHIN

THIS EQUIPMENT. BE VERY CARE FUL TO

AVOID CONTACT WITH THESE HIGH VOLTAGES

IF FOR ANY REASON THE EQUIPMENT IS OPERATED

OUTSIDE OF ITS CABINET.

UNPACKING

This equipment has been thoroughly tested and inspected before packing.

you find visible

damage upon unpacking, notify the dealer at once.

the unit was shipped, you must file a claim with

the carrier, since only you can recover for shipping damages. Your dealer and EICO will cooperate.

VENTILATION

In all installations, consideration should be given to adequate ventilation in placing the unit.

Free air circulation through the perforated cabinet should not be obstructed at any time. If heat

removal by convective air movement is prevented or curtailed by cabinet obstruction, an excessive

temperature risewill occur which can damage components. Inany installation, avoid placing the unit

in a warm location (near a radiator or heating unit) or in a hot air stream.

ANTE NNAS

A suitable antenna, pr esenting 40 to 80 ohms resistive load should be connected to theANTE NNA

connector at the rear. Install the antenna as reco mmended by the antenna manufactur er . A type

PL259 connector is r equired for coupling the antenna cable to the ANTE NNA connector . In mobile

installations, the antenna may be mounted on the trunk lid, or on a rear fender . Note that a mobile

antenna tuned to resonance may have a radiation resistance below the 40-80 ohm matching range

provided by the 753. In this case, it will be requ ired to introduce additional capacitance across the

antenna cable, pref erably at a point in the antenna cable close

wher e it connects to the transceiver .

EXTE RNAL RELAY CONTROL TERMINALS

The EXTERNAL RELAY control terminals 1 and 2 at the rear comprise a SPST switch (rated at

1 ampere) to per mit control of accessory equipment, in conjunction with selection of transmit or

receive operation. Terminal 1 is chassis ground; ter minal 2 is floating during receive, and connected

to terminal 1 during transmit.

For example, a DPDT coaxial relay (or a pair of SPST coaxial relays} connected to EXTE RNAL

RE LAY ter minals 1 and 2 may be used to enable operation of a high power linear amplifier with the

Model 753. The required connections are shown in Fig. 1, including an additional SPST switch to

per mit either low power "straight-through" operation with the Model 753 or high power operation with

the linear.

MOBILE MOUNTING

The mobile mounting bracket supplied per mits the unit to be installed underneath the automobile

dashboard, and locked in place in the most suitably angled position for convenient operation. Further-

more, the unit may easily be released and removed in a

few

moments without tools. This facilitates

servicing, or ,

desired, double use

the Model 753 as both a mobile and f ixed station. Fig.

provides all the requir ed infor mation for installing the mounting bracket and for attaching the trans-

ceiver to the bracket.

MOBILE SPEAKER INSTALLA TION

In mobile installations,

is usually most practical to use the automobile radio speaker. To do

this, mount a DPDT switch underneath the dash, and use it

switch the speaker terminals to either

the automobile radio or the speaker output of the Model 753. DO NOT use the automobile chassis as

a ground return for the speaker, as an undesirable ground loop may be formed and result in an abnormal

degree of "whine".

ANTENNA

"STRAIGHT-THROUGH"

o ORELAY

HIGH POWER LINEAR COIL

-----------

VOLTAGE

EXTERNAL

JACK

{MODEL 753)

RELAY

{MODEL 753)

FIGURE 1

WARNING

AVOID PLACING THE

TRANSCEIVER IN

OR NEAR HOT AIR

STREAM.

FIGURE2

..,.

- --

TO REAR

BUMPER

MOUNTED

ANTENNA

.....

1---

-7ANOL£

--ioa1NG1

THUMB MOUNTING

IPLATE

SC EW BRACKET

LOCK

WASHER

MODEL 753

I l.2RN.:::

- --------,

'l/ DETAIL A ,.

DETAIL OF MOUNTING BRACKET ATTACHMENT

TO EACH SIDE OF TRANSCEIVER COVER.

INDEXING ARRANGEMENT PERMITS ADJUST-

MENT OF UNIT TO ANY CONVENIENT ANGLE

FOR OPERATION.

L__

WEUoED TO

cA__•1r T OF UNIT

---

HIGH POWER

LINEAR

AMPLIFIER

OUT

MICROPHONE CONNECTIONS

An Amphenol Type MC2M plug, or the equivalent, must be used for connecting the microphone

the panel MIC receptacle. The microphone may be either a high impedance dynamic (preferred) or

a ceramic type. Since all necessary audio bandwidth restriction is incorporated in the transceiver

circuitry, a wide-range, high quality dynamic mike may be used and is most desirable. The required

wiring to the MC2M plug is shown in Fig. 3.

FIGURE 3

CAUTION

----

/ \]

L-

Interchanging of the microphone connections by

incorrect wiring

the microphone plug will

cause a negative bias voltage

be applied

the microphone cartridge, resulting in possibly

serious damage.

OPERATION

IMPORTANT: Before operation of the transceiver is attempted, a proper installation must be com-

pleted. This includes connection of a suitable antenna (40-80 ohms)

the ANTENNA jack, a correctly

wired microphone to the MIC connector (or a key

the KEY jack at the rear), and a proper power

cable from the power supply

the POWER plug. The FUNCTION switch must be set at OFF during

the installation.

SSB OPERATION

Preset panel controls as follows: (abbreviations: cw - clockwise, ccw - counterclockwise)

MODE switch. . .

•

....

.....

. .at SSB

MIC GAIN.

....

•

fully ccw, but not past detent

CARRIER BALANCE

...

•

...

at12o'clock

RF GAIN....

....

.......

.•

.at

9 o'clock

AF GAIN

.........

......

.fully cw

BAND

selector..

•

........

..at proper

band

MAINTUNING

..............at

desiredfrequency

RCVR

OFFSET.

.....

..atcenterline

PA TUNE

.......

...•at

o'clock

PA LOAD.

.......

•

fully ccw

EXCITER TUNE

...

.....

.at

12 o'clock

FUNCTION switch.....

...

atSTBY for 5 minute warmup, and then

P-T-T

RECEIVER TUNE-UP FOR SSB OPERATION

Adjust PA TUNE and EXCITER TUNE for maximum audible signal strength or background

noise. These adjustments result in approximate transmit tuning since they are common

receiver

and transmitter.

2. Adjust AF GAIN for a normal listening level.

TRANSMITTER TUNE-UP FOR SSB OPERATION

Set MODE switch at TUNE and adjust EXCITER TUNE for a maximum meter reading.

2. Adjust PA TUNE for a minimum meter reading (dip) to obtain correct tuning of the output PI

network.

3a.

microphone is equipped with PTT switch, return MODE switch to SSB. Depress PTT

button on mike and adjust the CARRIER BALANCE control for a minimum meter reading.

NOTE

this is the first time the 753 is placed in

operation, set the BIAS adjust on the rear

apron so that the minimum meter reading

obtained with the CARRIER BALANCE

control in 3a above is 50mA.

3b.

the microphone is not equipped with a PTT switch, return the MODE switch to SSB. Set

the FUNCTION switch at VOX. Leave the MIC GAIN fully ccw (but not past the detent).

NOTE

this is the first time the 753 is placed in

operation, now adjust the rear panel VOX

controls as described in the NOTE of Step 2

in the subsequent MICROPHONE GAIN

adjustment.

While holding the relay in the transmit condition with a steady tone or sound into the microphone,

set the panel CARRIER BALANCE control as described in step 3a (and the rear apron BIAS adjust,

as given in the NOTE following 3a, if this is the first time the 753 is placed in operation).

4. Reset the MODE switch at TUNE and adjust EXCITE R tune and PA TUNE as described in

steps 1 and 2. Slowly turn the PA LOAD control cw and "dip" meter reading with PA TUNE control

until the meter reads between 250 and 300ma. Reset MODE switch to SSB. This completes proper

tuning and loading of the transmitter.

NOT

(>('Oh

'4-

D v

;l1t.l

Tune-up procedures should not be prolonged

more than Wseconds in any one adjustment

period to avoid excessive heating of compo-

nents in out-of-resonance conditions.

ADJUSTMENT OF MICROPHONE GAIN

For push-to-talk operation, set FUNCTION switch at PTT. Depress mike PTT· button and

turn MIC GAIN control cw while speaking until the average meter reading is between 100 and 150ma.

As the MIC GAIN is advanced further cw, a point will be reached where the average meter reading

with uninterrupted speech will hover around 150ma. When this occurs, peaks .will actually be in the

300ma region.

the MIC GAIN is advanced past this point, the average meter reading will not in-

crease because of the ALC action. Do not turn the MIC GAIN clockwise past the point where there

is no increase of the average meter reading on normal uninterrupted speech, as doing so will not

increase output power but simply result in excessive gain and unnecessarily increased noise.

For VOX operation, turn the FUNC TION switch to VOX. Set the MIC GAIN control fully ccw

(but not past the detent).

NOTE

this is the first time the 753 is placed in

operation, now adjust the rear apron VOX

controls as follows (unless they have already

been adjusted as required in the NOTE of

step 3b, in the previous TRANSMITTER

TUNE-UP FOR SSB OPERATION procedure).

Set the rear apron VOX controls as follows:

VOX-SENSITIVITY

........

..fully cw (max. sensitivity)

VOX- THRESHOLD.

...

•

.....

.fully cw (guaranteed to return to receive)

VOX-DE LAY.

......

•

....

.fully ccw (minimum delay)

ANTI-VOX.

...

....fully cw (maximum anti-vox)

Repetitively speak a few syllables into the microphone to trigger the VOX to "on" as often as

necessary, while adjusting the VOX-DELA Y control until the desired release time af ter speaking is

obtained.

Now, turn the VOX-SENSITIVITY control ccw to a point where the relaytrips easily while speak-

ing into the microphone at normal level and distance, yet does not trip on normal background noise.

In a mobile installation, this adjustment should be made for "close-talking", in order that the nor mal

automobile and wind noises not cause the VOX to trigger.

Next, place the microphone in its normal position of use, and set the A F GAIN control for a

normal listening level from the speaker as normally located. Then turn the ANTI- VOX control ccw

(reducing ANTI-VOX gain) as far as it may go without permitting the VOX to be triggered to "on" by

the sound from the speaker reaching the microphone. From this point, back off cw about 30 degrees

of rotation to insure adequate anti-vox gain to handle voice peaks.

Now reset VOX-THRESHOLD to fully ccw position. Trigger the VOX to "on" by speaking one or

two syllables into the microphone, and then turn the VOX-THRESHOLD control cw until the r elay re-

leases. As there may be some "chatter" at this critical point of the VOX- THRESHOLD control, turn

it just slightly further cw than the critical point.

While holding the relay in the transmit condition by speaking steadily into the microphone, adjust

the MIC GAIN control exactly as described in step 1above. In a mobile installation, make this adjust-

ment for "close-talking", in order that the normal automobile noises not cause the VOX to trigger.

3. The transceiver is now tuned and ready to operate. Re-adjust EXCITER TUNE and PA TUNE

the operating frequency is shifted substantially.

MAIN TUNING CONTROL

The MAIN TUNING control has a unique dual ratio ball drive, permitting both 6:1rapid tuningand

30: 1 fine tuning. Fine tuning over 10 degrees of scale is obtained in the opposite direction of knob

rotation used in rapid tuning. For this reason, turn slightly past the desired frequency in rapid tuning

to assure that the exact desired tuning

requency will be in the range of the fine tuning.

RECEIVE R OFFSET TUNING

Permits fine tuning of the receiver ± lOkc without disturbing the transmitting frequency or the

initial calibration of the frequency dial. No offset from the transmitting frequency (and the frequency

dial setting) is obtained with the RECEIVER OFFSET control setat the center line. Rotation cw from

the center line lowers the receiving frequency, while ccw rotation from the center line raises the

receiving frequency.

CW OPERATION

is assumed that the r ear apron BIAS adjust has been set as descr ibed in TRANSMITTE R

TUNE -UP FOR SSB OPE RATION. For break- in operation,

is also assu med that all VOX adjust-

ments at the rear have been set as described in the note of step 2 of MIC ROPHONE GAIN ADJUST-

MENT.

2. Insert key plug in KEY jack on rear apron.

Set BAND SELECTOR

MAIN TUNING to desired band and frequency.

Set MODE switch at TUNE and adjust transmitter as described in steps 1 and 2 of TRANS-

MITTER TUNE-UP FOR SSB OPERA TION. The CARRIE R BALANCE setting has no eff ect in CW

operation.

For manual operation, set the MODE switch at CW and the FUNCTION switch at PTT. For

the duration of a transmission with manual operation, either the microphone PTT button must be held

depressed, or an external PTT switch wired to the microphone must be set at the transmit position.

When the microphone PTT button is released, the receive condition is obtained.

For break-in operation, set the MODE switch at CW and the FUNCTION switch to VOX.

Depressing the key automatically switches the VOX relay from receive to transmit, and the relay will

hold at transmit until sending is stopped. The rear apron VOX-DELA Y control may be readjusted to

set the relay "hold-in" time as the operator desires.

NOTE

In CW operation, the usual practice is to transmit "zero beat" with

the station being worked, which would seem to require the RCVR

OFFSET tuning control be set at the center line (no offset). How-

ever, a small fixed offset, determined as follows, can be used to

obtain a comfortable, consistent listening note in receive, while

retaining exactly "zero beat" transmission. First, set the RCVR

OFFSET tuning control at the center line (zero offset) and tune in a

CW station to "zero beat" with the MAIN TUNING control. Since

there is zero receiver offset, you will transmit "zero beat" with

the station.

Now

tur

the

RCVR

OFFSET tuning control in the

direction of the strong side

"zero beat" to a point where a

comfortable listening note is heard. This is the small,

ixed off-

set referred to above, which should be retained thoughout

operation. Now,

you tune in any

station subsequently with

the

MAIN TUNING

control only (RC

OFFSET remains as set

previously), so as to produce the same comfortable listening note,

your transmitter will then be tuned exactly "zero beat" with the

received

station.

AM OPERATION

The following procedure is based on the assumption that the 753 has been setupfor SSBopera-

tion, and that it is now intended to operate AM.

Set the FUNCTION switch at either VOX or PTT, depending on the desired type of operation.

Set BAND selector and MAIN TUNING at desired band and frequency.

Set MODE switch at TUNE and adjust transmitter for a meter reading of 250-300ma under ''tune''

conditions.

Set MODE switch at AM, and turn MIC GAIN fully ccw (but not past detent). Now trip the

relay to the transmit condition, either as described in step 1 (PTT operation) or step 2 (VOX operation)

of MICROPHONE GAIN ADJUSTMENT.

the CARRIE R BALANCE has been adjusted previously as described for SSB operation, it

is not necessary to readjust this control for AM operation.

the meter reading is below 150ma in

transmit with the MIC GAIN fully ccw, a more critical adjustment of the EXCITE R TUNE may be

necessary. This adjustment may be made with the MODE switch at AM, and the EXCITER TUNE

control adjusted for a peak meter reading (around 150ma).

Turn the MIC GAIN control cw until the meter is just on the verge of flickering on voice peaks,

but no further. This will require a lower setting of the MIC GAIN control than is used in SSB opera-

tion.

The 753 is now properly set up for AM operation. Least distortion on AM reception will

usually be obtained when tuned slightly to one side of "peak".

ADDITIONAL NOTES ON CONTROLS

MODE SWITCH

The rear apron KEY jack is internally disconnected at the SSB and AM positions of the MODE

switch, thus allowing a key to be plugged into the KEY jack in all modes of operation. Note that in

manual CW operation (FUNCTION switch at PTT), closing the key without depressing the PTT button

(thus remaining at receive) may possibly result in an annoying audible oscillation. Of course, no

transmission occurs.

break-in CW operation

(

FUNCTION switch at VOX), closing the key auto-

matically causes the VOX relay to trigger to "on" and provides the desired break-in. In the TUNE

position of the MODE switch, the keying circuit is internally grounded to place the transceiver in the

transmit condition. Simultaneously, one of the 7360 balanced modulator deflection plates is grounded

to provide greater than normal drive of the final amplifier for tune up.

must be noted that, with an

antenna connected, full power CW transmission will occur at the TUNE position and cause undesired

interf erence on the frequency in use. Therefore, perfor m the tune-up procedure as quickly as possible.

PA TUNE & PA LOAD CONTROLS

Note that the PA TUNE and PA LOAD controls are inter-dependent. As the PA LOAD is turned

cw (increasing the meter reading), repetitive readjustment of the PA TUNE control for a "dip" in the

meter reading is required. At a meter reading of 250-300ma, proper loading to 200 watts peak input

is obtained. Do not exceed a loading current of 300ma, as additional input power from a 750V supply

will not provide increased output power because of decreasing efficiency of the 753 final amplifier.

In making these adjustments, it will be possible to observe whether the conditions for proper

operation of the linear final amplifier are obtained; namely, proper idling current adjustment, and

enough drive for adequate peak plate current in the off -resonance condition. Presu ming proper set-

ting of the rear apron BIAS control as given in OPERATION, and proper adjustment of the EXCITE R

tune control, a maximum off -resonance plate cur rent greater than 350ma should be read on either

side of the "dip" point obtained with the PA TUNE control. This value of off -resonance plate current

may not be achieved

AC line voltage is below the rated input of 115 VAC with the Model 751 AC

supply or below 12. 0 VDC input with the Model 752 Mobile supply; also

if,

for any reason, there is

low plate supply voltage to the final amplifier at full load, low driver B+ voltage, incorrectly opera-

ting exciter stages providing low drive, or def ective final amplifier tubes.

low off -resonance plate

current is obtained because of low AC line supply or battery voltage, operation will not be impaired

as long as the PA LOAD control is not adjusted to produce excessive loading conditions. Do not, in

any circumstance, advance the PA LOAD control so that the plate current at the resonant dip exceeds

85% of the off-resonance plate current observed by detuning the PA TUNE control.

the "dip" point reading exceeds 300ma with the PA LOAD control turned fully ccw, then antenna

load impedance is less than 40 ohms.

the "dip" point reading remains less than 300ma with the PA

LOAD control turned fully cw, then antenna load impedance is over 80 ohms.

either of these condi-

tions obtain, it will be necessary to adjust the antenna impedance to present a proper load at the

transceiver antenna ter minals. This may be done by means of impedance matching networks, or, in

some cases, by adjusting the length of the transmission line to obtain a terminal impedance within

the matching range. The remedy for a particular case (impedance below the matching range with a

mobile antenna) is described under Antennas in the Installation section. Unless proper matching an:d

loading is obtained, excessive distortion will occur in SSB operation.

CARRIE R BALANCE

Once the CARRIE R BALANCE control is properly adjusted as described for SSB operation,

to be lef t in this position for all subsequent SSB, AM, and CW work. Partial carr ier unbalance is

obtained automatically at the AM position of the MODE switch by connection of resistor R42 between

one of the 7360 balanced modulator tube deflection plates and ground. This partial unbalance should

be exactly that required to set up the transceiver for AM transmission, provided that the CARRIE R

BALANCE control is properly adjusted as described for SSB operation. In the CW position of the

of the MODE switch, one deflection plate of the 7360 balanced modulator tube is automatically grounded

to provide complete carrier unbalance. Thus, in CW operation, the CARRIE R BALANCE control

setting has no effect.

CALIBRATION AC TIVATION

The 753 provides power and input connections for a lOOkc crystal oscillator employing a tube with

a 12. 6 volt heater. A 4-pin plug (EBY 11'9721-71) must be wired to the calibrator connection cable as

follows:

pin 1: 12.

volt heater

pin 2: Ground

pin 3: Calibrator signal output

pin 4: B+

The 4-pin plug may then be inserted in the CALIBRATOR socket on the rear apron. To activate

the calibrator , the MIC GAIN control is turned fully ccw past the detent.

AF GAIN CONTROL

May be used as a volume control in listening with either a loudspeaker or headphones. However ,

most operators pref er to run the A F GAIN wide open (fully cw) for SSB and CW reception, and use the

RF GAIN control as a volume control.

RF GAIN CONTROL

May be set in accordance with the operator 's preferences, with, however , the understanding that

the S-Meter reading is affected by the setting. Nor mal S-Meter operation is obtained with this control

turned fully cw.

S-METER ZERO ADJ USTMENT

Set the MODE switch at SSB and the RF GAIN fully ccw. Adjust the S-METER ZERO control on

the rear apron for a zero S-Meter reading. The S-Meter will now read received signal strength or

background noise.

All other control adjustments and uses are described fully in the Operation section.

CIRCUIT DESCRIPTION

TRANSMITTING

Two stages of microphone amplification are provided by V lA and VlB. A sample of the speech

wavefor m is taken from the plate of V lA, before the MIC GAIN control, and applied to V3A, the VOX

amplifier . A description of the VOX circuit is given in the Receiving section.

Balanced modulation is eff ected with the 7 360 beam deflection tube, V2, which has as its grid in-

put signal the output of the 5. 2 mc crystal-controlled carrier oscillator , V4A. Audio from V lB is

applied between the deflection plates, and is R-C coupled through C7 and R9. The DC bias on the

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