ICOM IC-775DSP review

-----riii\

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The

he

ICOM

ot-me-une

T

give
would like to say that I have been testing and

775for

n it a thorough lesting.

Before getting into the review, however, I

IC·775DSPtransceiver

lCOM product. I

qu

ite

some

timeand

have

is atop-

had

have

ICOM

the

really

IC-775DSP

Transcei

BY

LEW

McCOY',

WlICP

ver

reviewing equipment for articles

thanIii

ago when I first did reviews f

employed in the Technical Department of the

ARRL

to really wring out a piece of equipment, check-

ing charactenstcs such

marily testing the technical aspects of gear. I

notethat now

ficult for today'samateur to comprehend. Many
of us do not even understand the terms used to

describe the
ment. In plain, simple language ,

hot-shot engineer to even begin to understand

whatthe revieweristalkingabout .In

(in

ket

o think

at the time .

my

opinion) the reviewer completely misses

aOOUt

some

va

rious aspects of modern equip-

.Actually,It

Our

goat in

as

ease

reviews tend to be very dif-

lor

more years

was40years

or

051

those

01

use, bot pri-

it takes a real

manycases

. I was

days

was

The

ICOM

Ic-nSDSP

transceive

r.

the point. Numerous graphs and charts to show

a product's characteristics often will only
plete
they are unnecessary.
Simply because
point
cemed about stability,
orkey ingquality.Let's givecredit where
The manufacturers are
good

lyconfuse

the reader,and

mooem

where one ooesn't

job.

IleeI

Why

design has reached a

have

to

sometimes

unnecessary?

be

or third-order distortion,

very

capable

and

com

too con-

it is due:

do

a

The Basics

Let's try to look at the IC-

viewpoint ,

oneIhope

everyone

77

5 from a differe

understands-

nt

-

au

takes

so

manual
trations included. II's

spen

I

and

some

many

is extremely detailed with

t considerable

the transceiver to familiarize

getting

features

used

available

81/2" x 11"

time

to

studying the manual

because

. The instruction

and

there are

many

63

pages

myself

illus-

with

the

ways
that

.

they

For

ware

features. As a writer myself, I

been

the

are

example

can

irked

reader

saying.

, I find that buying and using soft-

by

trcse

automaticallyunderstands

Such

writers who assume

is not

always

be extremely frustrating. I bought a

have

the

al-

what

case

.

that is, primarily from an operating standpoint.

The

of equ ipment. Incidentally, "DS
Dig ital Signal Processing.

whistles· has

but in this case it is

unit

with a

co
addit

go

ter

tra nsceiver is 16

weighs

IC-77S0SP

is a self-contained ,

bu

ilt

·in

vers the 160 through 10 meter

ion oilers a general-coverage receiver.

Here are s

into thediscussionof performance and tea-

es

thatshould appeal to

37

pounds.

is

been

power

ome

3

an

extremely exotic piece

much

more

/4'W x 6

Us

abused

deserved

200

supply .

basics , and

powersupply

P"

stands

The

everyamateur,The

'H

term
. Basically,

watt transceiver

The

x l S

1:lells

by

reviewers ,

transmitter

bands

then

1

/2"0 and it

is self-con-

for

and

the

and in

we

'll

tained . I

uatthat

andthere

detai

the

er I tested
by

ICOM

The

"Technical

Si

lver City,

e-mail:

3

0.

have

shows

ls. I

.

IC-77SDSP is realty a

mcco

CO • MaV1997

are

met

Ed

NM

includedthe

all the specifications (fig. 1

plenty-if

also

yOzia

might

or

exceeded

itor, CO,

88061

ne

t.com

page

you would like to study

add

1500

tnat

all

from t

tbe transceiv-

the

specs

joy

to

operate

West Idaho S

he

man-

)-

given

. It

t,

This closeup viewshows the right side

the

tenn

view shows

The one

VFO.

fi

the

~NR·

at

at

the

the

transceiver

the left

left indicates that

set

is

for the

The tuning knob for this

fter switches

just

above the Twin

up

ma

in tuning

setup

as

is the large knob below.

of

the

frontpanel

the

noise

"Dualwatch ,·

and

PST

the

tuning cont

01

reduction

whereby

one

at

the far right is the setting

rol.

the

Ic-nSDSP

of

the

DSP

both usable frequencies

Along

At

the bottom

the

.

On

the

action is operating_

far

right

is

Say

the

Y

of

RfrffX

ou

readout dial,

Thi

are

of

the

Saw

shown.

the other

panelare

cont

It

In

rol.

CO

s

.GENERAL

• RECEIVER

• Frequ ency coverage :

Receive 100kHz - 29.990 MHz

Tra nsmit 1.8

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3.500 - 3.999999 MHz"

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and

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(12 dBSINAD)

sensitivity (Preamp

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and

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ANTENNA

• Matching Impedance

• M

•

• Insertion loss

inimum

In

put

Tuning

(anetluning)

power

opera

accuracy

TUNER

ting

range

16
(Less than VSWR 3:1)

:

.7

-150Q

unbalanced

: 8 W

: VSWR 1.5
:

Le

ss

than

:1
1

.0

or l

dB

ess

• Microph one
impedan

Fig.
tuner

verylarge
ating system). When I installed DOS into a
computer, I found
pacted and had to
could
by page and

1-

The specifications for the transceiver as published

specs

. In

book

be

used. I went through thai book page

ce

my

tests I used a multiba

that describesDOS (disk oper-

that all the files were com -

be

expanded before they

searched the index, but mere

:

600

Q

nd

by

ICOM.

antenna that was less than 3 to 1 impedance match f

antenna extremely

wasn't a single
friend told me to use the "

word

Th

e unit met or exceeded

well.

about

hOw

EXP

to

do

this. A

AND" command,

all

exactly what
excellent manual and a

but there wasn't a word aboul that command

the

in

doesn't have

radio

book!

abb

reviations are spelledout soyou know

The

this problem. Common amateur

manual for

the

IC-nSDS

P

Features

Let's discuss some of
found on most

these specs in

or

50 ohms. The bum-tn tu

mytest

is

being described. This is an

transceivers these days before

s. Note the antenna

ne

r handled fhis

credit to ICOM.

the

common features

32

. CO • May 1997

say

You

Saw

It

In CO

Windows

• Interlaces easily to most radios.

• Supports maj
OX

CC, WAS. WAZ, WPX , VUCC,

TEN-TEN, IOTA and US Counties.

• Interlaces with packet and OX spotting

3.1

and

or

awards tracking for

Windows

95

This

to. At the upper left are the preamp controls

is t

he

left side of

tile

front

panel.

There are lots of controls, a

and

the meterreading switch. Below

nd

tIleytake a Ifftfe getti

thOse

tuner controls, one for either antenna input. Then there are the keyer controls, follow

blanker controls, then AGe and compressor controls. At the bottom left

BalancelTone, NR (noise

reduction level), a

nd

Squelch. followed by Mic gain a

ar

e the AF

nd

PW

ng

used

are the

ed

by noise

/RF

R controls.

networks

• CW keyboard wI memories and
adjustable tone and weighting.

• RTTY terminal interlace
definable 'brag' messages.

• Extremely fast! 'Eye blink'

• Quickly import your old logs from all
major logging programs.

• Unequaled customer support

ONLY

Come

vi

sil

,

wI voice announcements.

wI user

wuh

and

$69.95

lI

SOlI

Daytcn .

see for yourself

plus sIh

KOO

speed.

TII

I#3t6.

getting into the many more unusual aspects of
the IC·775DSP. We'll start with the meter and
meter switch.

va

There are six switch positions a
read
standing wave ratio on

output)

shows

The ALC (Automatic Levet
is
pression lever being used. The 10 Shows the
drain currenton the final FET,and the las
tion, VO, indicates the

of the final FET.

various functions. First, $WR reads the

tne line to the input (or

of

the unit. Next, the PO power output

the relative RF power output in watts.

Cootrol) indication

follOwed by COMP, which Shows

dr

ain terminal vottage

There is a built-in antenna tuner which will

ilable to

the

com-

tposi-

is operating off his frequency. Even more trn-
portant, the main and sub-frequencies are
completely independent and can be controlled

with different tuning dials
pendent dial lock functions). These functions
really expand
ple, in OX or contest

your operating ability. Forexam-

ope

onetransceiveoperation

wnile you keep operating on another frequen-

cy. Also, as you can

display

Another outstanding
the triple st
have the equivalent of three VFOs on each
band. Three separate registers allow you to

is very easy to read for both setups.

ac

king register. With this setup you

see

(wnich include inde-

rating you can set up

on

the desired station

from the photos, the

ope

rating function is

match any load from
down to an $WR of 1.5 to 1 or less. I employ
several antennas; one isafive-band beam that
has some wide SWR curves on certain bands.
The IC·
within

er

tun
quickly , an important feature for contest
atiOn

To give you a quickexample
test-operating feature, there are two frequen­cydisplays--the
display_
ally.Theyarelabeled the Ou
F

or

7750SP

meoeslredrangeon allfrequencies.The

is completely automatic and tunes very

when band changing is necessary.

Either display

example,you

broughtthe SWR down towell

maindisplayand a secondary

ca

16.7 ohm to 150 ohms

of

one DXlco

ca

n be tuned individu-

alwat

n program

ch

one

function.

of the tun-

ope

r-

n-

memorize the three frequencies and modes
used on eachband, You simplypush the
key once tocall up the last used frequency and

mode, push the switch twice to call up the Ire-

quency and mode

three times to use the frequency and mode

it
before
as you read about it, but it only takes minutes
to become familiar with

Slill another operating feature is
nelized quick split function.
quickest possiblemethod 01operating split fre-
quency
tion is necessary; simply pushing
setsplit-frequencyoperationovera rangeof

that. This may sound a bit

for OX or net operations. No dial rota-

used before that, and push

co

mplicated

this verynice feature.

the

R

This permits

switches will

Band

"Chan-

the

%99

ing contro ls foran automatic CW OX call, acti­vatethatcalling function,andthentunethesec­ondary control to see where the OX station is

listening. A simple instantaneous switch puts
your transmit signal on the desired frequency.

To elaborate on this fun ction, the memory

keyer memorizes and retransmits three differ­ent CW keying operations of often-used infor­mation such as
(or contest exchange) . There are approxi-

40

mately
able.

One of

characters and 101 memor'ies avail-

the

is the Oualwat

rig, antenna Iype. location,etc.

main features

ch

. which allows you to receive

of

this transceiver

two signalson thesame band at the same time.

kHz in a 1 to

I mentioned the built-in antenna tun

er, and anoth

er

tun

includes all bands
change bands, the tuner automatically sets it­self, so no tuning is required.

Processing) feature and the IC-775DSP. OSP
is a fairly new concept in transceiver design ,

and
ed, what it does

of

solid·state devices,separates

the desired received (or transmitted)signal

uses an automatic preset memory that

Let's n

while the technical aspects

The digit al signal processor, a combination

ow

99

kHz step channel operation.

er

earli-

er

word or two is in order. The

(1

60

meters,too).When you

discuss the OSP (Digital Signal

ar

e complicat-

is simple.

the

noiseIrom

be-

S

Cl

MA

ME

R'

Youcan,forexample,monitora OXstation

Say You

saw

It In CO

whO

fore they enterthe audioamplifier. Outstanding

"'-

P

hone

"

"'U$4"

:

407-34~9

FAX

:

11''

May 1997 • CO • 33

407-34~2485

signal-la-noise ratio is achieved, providing

clean, clear audio in
and

ture of pulling very weak signals out of the

noise . In the beginning . DSP was used in
audio cha in.

ess was moved to the IF (intermediate fre-

quency), where

IC
mod ulator constructed
phase

This

transmission
of SSB signals.

notes

clear SSTV reception. DSP

Just

the

-nSDSP
shifter and radically

provides consistently reproducible, clear

Not

ch filters

have

employs a digital modulator/de-

in

SSB

to

become a way of life in amateur

SS8,

recently, however, the proc-

signal is processed . The

and high-qualityreception

take out

easy

using a 9O-degree

to

new

unde

copy

has

architecture .

sired carrier

RnY

tile fea-

the

,

radio. The
a joy 10 listen to. Beat signals are notched out
automaticallywith the DSP system ;

need 10tune them out with a notch control.

On

CW, under crowded conditions a digital
narrow filter can
Hz, ultra-narrow
nearby interference
signal with improved signal-to-noise ratio.
Another feature for
low- and high-pass filter. You can set the de­sired audio characteristics for transmit

ceive

lPF
to 14 levels .

independently using these lilters. The

can

Notch

be

adjusted to 18 levels and the

function in the

be

kicked in, providing an

CW

filter. This effectively cuts

and

CW

pulls out the desired

work is an adjustable

Ic-nSDSP

there is

and

HPF

is

no

80

re-

The IC-775DSP transceiver is a re

switches are

Ihe

CW ReverseMode.This simplymeansthat

via a front-panel switch,
nal alongside the signal you are trying 10 copy,
you
tening

simply hit the switch

on the other side

just

to the left of the main tuning dial. The readout

if you have a

and

of

zero

ally

you will

nice

beat-away

CW

be

bo

x that puts

sig-

lis-

ou

t a

panel

200

waif signal. The various mode

is clear

and

vel}'easy to read.

Now we get into interference

features. Twin passband
tronicallynarrows

quencypassbandwidth inorderto reduceinter-

fering signals that overlap
passband. With twin passband filters you can

electronicallyshift

455 kHz

gether for really clear reception during crowd-

ed band conditions.

The IC-

reallyisa

and

godsend

9 MHz IF filters separately

nSDS

the

the

P

receiverintermediatefre-

centerfrequencies

has

fo

rCW

luning

the

a very cute feature that

operators. Itiscalled

and

(PBT)

edge

rejection

elec-

of

the

of

or

IF

the

to-

from the interfering signal. I used thiscontrol a
great deal during a

is really a big help.

addition

In
is a manual notch
allows you to
signalthat

provides
more than enough to kill the undesired signal.

ThenoiseblankeriswhatIwouldterm excel-

lent
trical noise that sounded like li

Just this morning I had some kind of elec-

the

4S

to

cut out a very strong undesired

AF notch

decibels

contest

an

automate

fitter. The manual IF notch

.

and

wco't
of

anenuation--much

believe

notch filter, there

touch.Thisnotch

ne

noise . It was

me

,it

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callour

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White

14623

16-

?

34 • ca •

May

1997

Say

You

Saw

It

In

ca

to admit it was a lot easier than the old days

we

when
ging all the contacts. The IC-775DSP did an

ran mulli-op with one assistant log-

amazingly

good

As to DSP and so

processor digitally separates
nal from noise components before the signal
enters the audio processor. In other words. it
operatesat an intermediate frequency. An out­standing signal-to-noise ratio is achieved, and
weak-signal reception is improved immensely.

As mentio ned earlier,the digital notch
tion is outstandi ng. Any interfering hetero­dynes are automatically cancelled out. This
alone provesthe efficiencyof digital signal pro­cessing. This is also true with the
CW filter. During pile-ups and while trying to

receive weak signals. the ultra-narrow (80 Hz)

job

in this operation.

forth-the

digital signal

the

des

urna

ired Sig-

-narrow

func-

In this
tett is tor a transvertertx-verter input/output. Over on the right side are two accessorysockets.

or

l
externalspeaker,

lest operating for some of the real hal-shot
operators. Also, the front panel has an
tronic key jack and the back panel has a

mal key jack. Again, connect a paddle to the
front jack and computer keying equipment to
the rear jack; this makes a great contest con­venience! In addition, the IC·775DSP permits

rea

r viewthe two antenna input/outputs are visible

data communications and automatic antenna tuner, TNC, etc. To their right is a keyjack,

and

TIRcontrolrelayjack.Also available on the back is a 13

terminal. Anotherjack is for ALC

computer that had a contest operator's pro-

eiec

ncr

-

-

gram installed. An interlace (optional) was

used forthecomputercontrol. Also,

ing line from one of
first operation in a contest where the comput­er

did 99 percent of the work. By simply push-

ing a button on the keyboard, I senta contest

at

the upper lelt.

input.

The

my

serial ports. It was my

jack

.8

VDC,

at

the lower

at

Iran akey-

2 amp

digital

filter does a marvelous job.

Summary

It is obviou s from this review that I am very
muctl impressedwith

it is what many

Back in those earty days

Hammarlunds ,and so on, we considered them
pretty good receivers. Manyof us then liked to
prophesize what eventually would come about
in receiver design, but none of us could have
imagined a transceiver with the many fine fea­tures that this one has.

of

the

1G-77

us dreamed of years ago.

when we had HAOs.

5DSP.Frankly,

of

adjustment
Hz in 20 Hz steps. Choose a pitch thatyou find
co

mfortable to operate with.
In my lesting I married the IC-775DSP to a

the CW pitch from

ZR-3

300

Hzto

900

Antennas

you

miss

The ZR-3 is the world's smallest and most efficient vertical

ca.When a

call and then pushed another button and his

call and report were

the

logging , score keeping. and so on. I have

state

n called me, I typed in his

sent. The computer did all

The IC-775DSP is a product of ICOM Amer-

ica.Inc..2380116th Avenue NE.Bellevue ,WA

98004
$4

.760

. It has an

.00

. •

NO NEED TO WAIT FOR SUNSPOTSI

that

Force 12 antennas

are

inefficient

working

have

stations

you

allow

loss

could

on

you

both

have

to

be heard.

RX AND TXt

worked

with

which
a Force 12.

for

ama

teur net

means

20-15-10

pr

ice

of

The
only

WIth

F

variety of m

Call or

"Blue Li

29Mtall.

blu e

or

ce

an

12

write

ne"ZR-2M

The

odized

manufa

on

oba

C.

3 18'

C

-4

-4X

C

for a

Bl

ctu

nders

L3

is a vertical d

ue

Line

aluminum

res

18'bo

0'

co

m

and

boo

bo

m Vagi, 2

om Vagi,

om

mprehensive

mtrs at only

5'4"

proprietary Force
ZR-3 is >93% efficient,

ZR

·2M1

andstainless

ore

HF

ev

en

Vagi,

440

antennas

rotatable

0-15-10

C-3
C-3

ipolefor

is a two

+ 40 d
+ 2

8140

br

ochure on the

2 m

har

dwa

than

160mtrdipo

(+17&1

ipo

le C

Vagi

tall, plus

12

trs

band

re.

design developed

that

mo

any

2)

company
les.

Force

18"

base. It is a full vertical dipole using a

with NO traps,

is 15 M

del f

Efficient

or

12

Hz

2 m

in

C-3

-4S

C-4

pr

wi

de 2:1 (i.e.

trs

and44

the

verticals

S

SXL

oduct

for

3KW

world.Mu

12'boom
12'

23'boo

line, T

commercial applications. The

rating and a sin

135-

0.

from

boo

he

150MHz).It

An

BlueUn

lti--m

m Vagi, C

m Vagi,

ono

160

Vagi .

b

roc

ban

mtrs

20-

C-3S

hure

e a

ders

on

15-10

-3S

includ

gl

e Ieedltne.

has

ntennasare

up

+ 40 di
+

an

integratedba

for

28140Vagi

. A

(+

es

all

sm

17

po

co

all

&1

le

true

comm

mbi

sam

2)

spe

ZR-2

lun a

er

cial quality,

na

tions, a

pling includ

cifications and

,4-10

nd

wide

es

is

:

expla
(Straight
an

Or

C·

nations

d an

Available

der

swers, installation tips, operating h

Line

"'

of

terms. F

talk

: [phone]; Info

about

at

afl12

or

the

Antennas

HAM

RADIO

best

$10.00 you will

and

fT

echni

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elps

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ever

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a,

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tems

on

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Say Y

ou

Saw It In CO

CIRCLE 46

ON

REAOER SERVICE CARO

May 1997 • CO • 35