IC7600.pdf

Product Review and Short Takes from QST Magazine

November 2009

Product Reviews:

ICOM IC-7600 HF and 6 meter transceiver

Update to FlexRadio Flex-3000 Product Review.

Short Takes:

Depiction Emergency Management Software

Key Measurements

Summary

product review

ICOM IC-7600 HF and

6 Meter Transceiver

121

122

140

20 kHz Blocking Gain Compression (dB)

102

140

2 kHz Blocking Gain Compression (dB)

104

106

110

20 kHz 3rd-Order Dynamic Range (dB)

110

IC-7700 and IC-7800, and all offer a choice

of faux meter styles, too — standard (analog),

edgewise and bar.

If you’re already familiar with the PRO

line, you’ll feel right at home with the ’7600.

If you’re a newcomer, you’ll find the IC-7600

has a gentle learning curve. ICOM’s plain-

language menus are a major reason for this.

Reviewed by Rick Lindquist, WW3DE

National Contest Journal Managing Editor

2 kHz 3rd-Order Dynamic Range (dB)

Already widely known as the “PROIV,”

ICOM’s IC-7600 HF+50 MHz transceiver

is an apparent and worthy successor to the

extremely popular IC-756PROIII. 1 Whatever

ICOM’s designation, the IC-7600 is a terrific

performer with a fine complement of useful

tools for DXing and contesting! Granted,

the IC-7600 is not totally new and different

with respect to the older PROIII and the more

recent IC-7700 and IC-7800 transceivers. 2

This review will include some comparisons,

as appropriate, to the models with which it

shares some DNA. Let’s see how the IC-7600

stacks up.

-40

+35

20 kHz 3rd-Order Intercept (dBm)

Wider is Better

Legends and icons on the 5.8 inch 400×240

pixel display feature clean, straight lines. For

example, on the PROIII, the current operating

mode appears in a stylized horizontal tube,

sort of like a hot dog or a blimp. The MODE

indicator on the IC-7600 is a smallish but very

visible blue rectangle with white letters. The

RIT/XIT readout is smaller than the PROIII’s,

and it’s in a different display location that I

never quite got used to (the RIT/XIT readout on

the PROIII places larger numerals directly be-

low the last three digits of the main frequency

readout). As with the IC-7700, the IC-7600

offers only an “A” or a “B” display — one es-

sentially an inverse of the other — plus three

font choices — basic, italic and round. The

basic and round styles are quite similar, but

the round characters are a bit fatter.

After complaining about the limited view-

ing angle of the IC-7700’s otherwise excellent

display, we’re pleased to note that the IC-7600

offers excellent horizontal and vertical vis-

ibility from just about any angle. The IC-7600

does not provide for connecting an external

VGA video display, however.

-40

+35

2 kHz 3rd-Order Intercept (dBm)

-31

-20

-35

Transmit 3rd-Order IMD (dB)

A Stylish Makeover

On its face, the ’7600 looks similar to its

PRO series forbears, the most notable excep-

tion being a larger and improved LCD display

(Figure 1). My wife liked the new display after

comparing the PROIII and the ’7600 side by

side, so it must be better. The IC-7600 is es-

sentially the same convenient size and weight

as the PROIII with a similar front-panel lay-

out. Some may mourn the replacement of the

PROIII’s moving-coil meter with an excellent

digital emulation on the ’7600’s larger display.

ICOM has a similar implementation on the

-48

-70

-20

Transmit 9th-order IMD (dB)

pr041

Key:

80 M

Dynamic range and intercept

values with preamp off.

Intercept values were determined

using -97 dBm reference

20 M

Bottom Line

1 R. Lindquist, N1RL, “ICOM IC-756PROIII

HF/6 Meter Transceiver,” Product Review,

QST , Mar 2005, pp 56-59. QST Product

reviews are available on the Web at

www.arrl.org/members-only/prodrev /.

2 R. Lindquist, N1RL, “ICOM IC-7700 HF and

6 Meter Transceiver,” Product Review, QST ,

Oct 2008, pp 41-47.

The IC-7600 represents a superb

synthesis of ICOM’s popular PROIII

and the IC-7700/7800 transceivers,

both in style, features and capability.

Another winner!

Cleaner Lines

Aside from its fabulous display, the

’7600’s uncluttered front-panel has a smooth,

Mark J. Wilson, K1RO 

Product Review Editor 

k1ro@arrl.org

From November 2009 QST © ARRL

semi-gloss surface that may be easier to clean

than the PROIII’s. The rest of the box closely

resembles the PROIII’s, but without the

sunken front apron and with sharper, rather

than rounded, features. The ’7600’s larger

knobs — the hefty, clean-edged rubber-ringed

tuning knob is like the one on the IC-7700 —

ease their use.

The radio’s bright-white control legends

are larger and easier to read than those on the

PROIII. While I do appreciate the PROIII’s

oversized red keypad numerals for entering

a frequency, those on the ’7600’s keypad,

though smaller, remain easy to read, and the

keypad buttons are larger to start with. In

addition, the “pointer” markings on the IC-

7600’s knobs are simple to see, and the rings

on concentric controls contrast ever so slightly

in hue and sheen. All knobs — even the stem

controls — are fatter than the PROIII’s. On

the other hand, the stem controls are in a more

congested location on the ’7600 because of

its larger display. The IC-7600 overcomes

the absence of contrasting colors on knobs

and front panel legends in part by employing

variations in button styles and shapes.

One minor unintended consequence of

the front-panel rearrangement: The TRANS-

MIT , TUNER and MONITOR buttons are in a

horizontal line on the left-hand side of the

panel, above the AF GAIN control. On several

occasions when I wasn’t paying close-enough

attention, I hit the TRANSMIT button instead

of the neighboring TUNER button, which has

a status LED. The MP-W and MP-R scratchpad

memory buttons also can blend in with their

neighbors, so you have to pay closer attention

to ensure you’re not pressing the adjacent

hard memory buttons. On the PROIII, the

scratchpad memory keys are not only larger

and off by themselves, but are in a contrast-

ing light gray.

Some additional visibility issues are worth

a mention. The right-pointing arrows on the

seven multi-function keys lining the left hand

side of the display blend into the background,

especially in soft light; these are not filled in

with a contrasting color to make them easier to

distinguish one from the other, much less to see

them at all in low light. In a similar vein, leg-

ends on the six LCD function keys just below

the display can be difficult to tell apart.

Just below the LCD function keys are six

mode switches. In addition to the FILTER and

EXIT/SET keys, the ’7600 offers individual

mode keys for SSB , CW , RTTY/PSK and AM/

FM . As a PROIII user, I appreciated not having

to share the CW mode with the RTTY key.

Unbundling the CW key also means you can

quickly swap from CW to CW-R when flipping

your tuning direction, as I often do during

search-and-pounce (S&P) contest operation.

The UP ∆ and DOWN ∇ buttons for

memory scrolling are positioned right next

to the main tuning knob, making them more

obvious and handy. Depending upon how

ham-handed (get it?) you are, their placement

may make the tuning knob more vulnerable to

the inadvertent jog when using them. I didn’t

have any problems in this regard.

I was pleased to find a feature on the

’7600 that announces signal strength reading,

frequency and mode in an agreeable female

voice. It’s possible to deactivate the S meter

and mode components. This is standard equip-

ment on the IC-7700 too. The ’7600 back

panel looks about as you would expect and is

shown in Figure 2.

shapes for SSB/SSB-D (data) and CW that

are independent of the shape setting on the

FILTER menu, but within strict limitations that

favor CW or AFSK modes only.

Here’s the thing: You can separately set

CW filters 500 Hz or narrower and 600 Hz

or wider to default automatically either to

soft or sharp. On SSB-D (for AFSK), it’s

possible to have the radio default automati-

cally to soft or sharp when the filter setting

is greater than 600 Hz. The same is possible

for SSB, although whichever shape you set

becomes the default for any practical SSB

filter. It would be far more useful for typical

SSB operation if, for example, you could

set the filter shape to default automatically

to sharp when the filter setting is less than

2 kHz or so, not 600 Hz. In any case, it’s just

a couple of button presses to change the filter

shape to whichever setting you want.

How Much Would You Pay . . .?

As the late TV huckster Billy Mays

might have hollered in another life, “How

many times have you been embarrassed by

transmitting on top of the DX when you

thought you were in split? Well, worry no

more!” The IC-7600’s mother of all SPLIT

indicators makes it really difficult not to

know when you’re working split. The

nearly 1-inch-long LED indicator along the

top edge of the display looks like a mini-

fluorescent lamp. An on-screen SPLIT legend

of contrasting shade accompanies the bright

light. ICOM also has placed the TX , RX and

DUAL WATCH LEDs above the display where

they belong; display icons reiterate the status

of these functions.

In a similar “isn’t that amazing !” vein, the

IC-7600 lets you type in desired text for CW

and digital memories using a USB (universal

serial bus) keyboard. This is a vast improve-

ment over having to “dial” in the memory

contents one character at a time using the main

tuning knob, although it’s a bit of a hybrid

system. To enter letters, you still must press

the upper-case or lower-case TEXT button on

the transceiver’s display while in edit mode.

In like fashion, to enter numbers you still must

press the 123 button. Pressing SHIFT on the

keyboard doesn’t work.

Diddles

While the PROIII can decode RTTY on its

display and transmit RTTY from memories

without the use of a PC, the IC-7600 offers

full transmit and receive capability in RTTY

and PSK31. Just plug a USB keyboard into

the radio, bring up the DECODE screen for the

relevant mode and you’re ready to roll, digi-

tally speaking. Unfortunately this capability

doesn’t extend to CW.

The DECODE screens for RTTY and

PSK31 feature helpful, but diminutive, water-

fall displays for finding and tuning signals. The

PSK31 screen includes a tiny, ever-changing

phase readout to lend further assistance, plus

AFC and NET; the RTTY tuning indicator is in

the upper right hand corner of the main display.

This was the simplest and easiest RTTY and

PSK31 experience I’ve ever had (well, at least

since reviewing the IC-7700)!

The PSK31 and RTTY waterfall displays

cover 1195 to 1805 kHz (610 Hz) with the

center at 1500 (there’s a choice of 1000,

1500 and 2000 Hz in both digital modes)

— quite a bit less real estate than you’ll

find on a PC screen with DigiPan or simi-

lar software. While using narrow filter set-

tings you must tune manually from waterfall

to waterfall; otherwise, you won’t always see

them, just hear them. For RTTY, the waterfall

display covers 1905 to 2515 (also 610 Hz)

with a twin-peak waveform that lets you tune

signals with precision. It’s possible to adjust

and read out the THRESHOLD .

Text appearing on the screen — red for

transmitted text and green for received — is

quite small, as is the “window space” avail-

able. Pressing the WIDE button gives you

more on-screen elbow room, but if you’ve

enabled the mini spectrum scope (the only

one available in digital modes), it yields to

the larger text window. In addition, lines of

text don’t always break appropriately, so you

need to pay closer attention. Copy on the

IC-7600’s decoder screen seemed compa-

Shape Shifting

ICOM has imbued the IC-7600 with top-

notch DSP IF filters, but the implementation

is not without some minor wrinkles. Basic IF

filter selection is essentially identical to the

PROIII’s setup with the exception of AM. On

the IC-7600, you can set the AM passband

between 200 Hz (!) and 10 kHz in 200 Hz

steps for a total of 50 discrete filter pass-band

widths plus full dual pass-band tuning. On the

PROIII, the IF filter passband choices for AM

are fixed at 9, 6 or 3 kHz, with a simple IF (ie,

single pass-band) shift available. For FM the

IC-7600 offers three fixed passband choices,

15, 10 and 7 kHz, just as on the PROIII.

To select a basic filter shape (sharp or soft)

requires going to the FILTER menu, rather than

to the DSP menu as on the PROIII. If you

pick SHARP or SOFT on the FILTER menu,

that shape setting applies to all three avail-

able filter bandwidth settings. The FILTER

SHAPE SET menu lets you configure filter

From November 2009 QST © ARRL

rable to what I was seeing via the MMTTY

engine on my PC’s display.

Using submenus on the DECODE screens,

it’s possible to save RTTY or PSK31 memo-

ries on a USB compatible medium, such as a

flash drive (you can also save voice memories

this way, but not CW). The RTTY and PSK31

memories are separate.

Contesting in RTTY and CW with the

’7600 (using a computer logger and RTTY

engine) was lots of fun, especially given the

exceptional receiver. In these higher duty

cycle modes — especially RTTY — the radio

got quite warm to the touch, although the

on-screen temperature gauge remained well

within the normal range. The cooling fan is

barely noticeable.

table 1

icoM ic-7600, serial number 0201165

Manufacturer’s Speciications

Measured in the ARRL Lab

Frequency coverage: Receive, 0.03-60 MHz;

Receive, as speciied;

transmit, 1.8-2.0, 3.5-4, 5.3305, 5.3465,

transmit, as speciied.

5.3665, 5.3715, 5.4035, 7-7.3, 10.1-10.15,

14-14.35, 18.068-18.168, 21-21.45,

24.89-24.99, 28-29.7, 50-54 MHz.

Power requirement: 13.8 ±15% V dc; receive,

13.8 V dc; receive 2.4 A (max audio);

3.5 A (max audio); transmit, 23 A (100 W out).

transmit, 18 A (100 W out). Operation

conirmed at 11.7 V (83 W output).

Modes of operation: SSB, CW, AM, FM,

As speciied.

RTTY, PSK.

Receiver

Receiver Dynamic Testing

SSB/CW sensitivity: 2.4 kHz bandwidth,

Noise loor (MDS), 500 Hz bandwidth:

10 dB S/N: 0.1-29.99 MHz, 0.15 µV;

Preamp

off

50-54 MHz, 0.12 µV.

0.137 MHz

–124

–126

–129 dBm

0.505 MHz

–130

–138

–141 dBm

1.0 MHz

–130

–138

–141 dBm

3.5 MHz

–131

–139

–141 dBm

Magic Decoder Button

ICOM’s APF (audio peak filter) skipped

radio generations. First appearing (in a some-

what different implementation) on ICOM’s

original IC-756, APF turned up again on

the IC-7800 and IC-7700 transceivers. Its

incarnation on the IC-7600 includes a new

twist. The TPF (twin-peak filter) for RTTY,

an RTTY FIL menu selection on the PROIII,

has been promoted to the front panel APF/

TPF button on the IC-7600. More on that

feature in a bit.

Pressing the APF/TPF button in CW im-

poses one of three mini audio-peaking filters

— 80, 160 or 320 Hz or NAR , MID and WIDE

— atop whatever DSP IF filter settings are in

play. To hear much of a difference, the IF filter

must be set to a passband that’s significantly

greater than the APF setting. For example,

you might use the 80 Hz setting when you’ve

got the IF filter set to, say, 150 Hz. When you

press the button, the current setting appears

briefly on screen, although you can disable

this. You can choose either a “soft” or “sharp”

APF shape via a menu.

On CW the effect of the APF is not espe-

cially dramatic when you’ve already selected

a narrow IF filter, but it does help further quell

background noise. The noise reduction pro-

cessor ( NR ), readily at hand, can do the heavy

lifting in that department, although the APF

seems to boost signal-to-noise ratio. It’s at its

best when you’re using, say, a 500 or 800 Hz

IF DSP filter and need a little more help.

For RTTY, the TPF is exceptionally ef-

fective. Pressing the APF/TPF button in

RTTY mode alters the radio’s AF response

by punching up the mark and space frequen-

cies, 2125 and 2295 Hz. During the July

North American QSO Party RTTY event,

the TPF brought “S-nuttin’” signals (as we

called the weak ones while I was growing

up in Northern New Jersey) right out of the

mud so they’d print. The ’7600 lets you use

the TPF in tandem with any of the three IF

filter bandwidths (plus soft or sharp contour)

you’ve set up in advance, and you can take

full advantage of the dual-passband IF shift

14 MHz

–131

–139

–141 dBm

50 MHz

–132

–141

–143 dBm

Noise igure: Not speciied.

14 MHz, preamp off/1/2: 16/8/6 dB

AM sensitivity: 6 kHz bandwidth, 10 dB S/N:

10 dB (S+N)/N, 1-kHz, 30 % modulation:

0.1-1.799 MHz, 6.3 µV; 1.8-30 MHz, 2 µV;

Preamp

off

50-54 MHz, 1.6 µV.

1.0 MHz

1.70

0.65

0.55 µV

3.8 MHz

1.50

0.59

0.50 µV

50 MHz

1.60

0.62

0.54 µV

FM sensitivity: 15 kHz bandwidth, 12 dB SINAD: For 12 dB SINAD:

28-30 MHz, 0.5 µV; 50-54 MHz, 0.3 µV.

Preamp

off

29 MHz

1.05

0.38

0.29 µV

52 MHz

0.62

0.24

0.22 µV

Spectral display sensitivity, preamp off/1/2:

–105/–116/–121 dBm.

Not speciied.

Blocking gain compression: Not speciied.

Gain compression, 500 Hz bandwidth*

20 kHz offset

5/2 kHz offset

Preamp off/1/2

Preamp off

3.5 MHz

121/122/117 dB

111/99 dB

14 MHz

122/123/120 dB

113/102 dB

50 MHz

119/121/120 dB

105/98 dB

Reciprocal mixing (500 Hz BW): Not speciied.

20/5/2 kHz offset: –105/–91/–82 dBc.

ARRL Lab Two-Tone IMD Testing*

Measured

Calculated

Band/Preamp

Spacing

Input Level

IMD Level

IMD DR

IP3

3.5 MHz/Off

20 kHz

–27 dBm

–131 dBm

104 dB

+25 dBm

–13 dBm

–97 dBm

+29 dBm

14 MHz/Off

20 kHz

–25 dBm

–131 dBm

106 dB

+28 dBm

–12 dBm

–97 dBm

+31 dBm

0 dBm

–61 dBm

+31 dBm

14 MHz/One

20 kHz

–33 dBm

–139 dBm

106 dB

+28 dBm

–20 dBm

–97 dBm

+19 dBm

14 MHz/Two

20 kHz

–39 dBm

–141 dBm

102 dB

+12 dBm

–24 dBm

–97 dBm

+13 dBm

14 MHz/Off

5 kHz

–37 dBm

–131 dBm

94 dB

+10 dBm

–20 dBm

–97 dBm

+19 dBm

0 dBm

–50 dBm

+25 dBm

14 MHz/Off

2 kHz

–43 dBm

–131 dBm

88 dB

+1 dBm

–24 dBm

–97 dBm

+13 dBm

0 dBm

–31 dBm

+16 dBm

50 MHz/Off

20 kHz

–29 dBm

–132 dBm

103 dB

+23 dBm

–15 dBm

–97 dBm

+26 dBm

( PBT ) feature. On the PROIII with the RTTY

tuning meter enabled, you can choose just

one of five possible IF bandwidths for RTTY,

you’re restricted to a single-passband IF shift

and switching away from the RTTY filter set-

ting disables the TPF .

The radio’s NOTCH operates in a some-

what similar fashion to the APF/TPF , al-

though the manual notch is adjustable via a

front-panel control. You can pick from NAR ,

MID or WIDE notch filters. As with the APF/

TPF feature, enabling the notch by pressing

seems to generate less crud than many less-

capable noise blankers impose. I was able

to use the NB in conjunction with the noise-

reduction feature to substantially reduce noise

that included impulse spikes apparently ema-

nating from a nearby solar panel installation.

Very aggressive/extreme settings like these

can add considerable distortion to desired

signals, however.

Receiver

Receiver Dynamic Testing

Second-order intercept: Not speciied.

Preamp off/1/2, +63/+63/+59 dBm.

DSP noise reduction: Not speciied.

Variable, 15 dB maximum.

Notch ilter depth: Not speciied.

Manual notch: 75 dB;

auto notch: 57 dB; attack time: 37 ms.**

FM two-tone, third-order IMD dynamic range:

20 kHz offset, both preamps on:

Not speciied.

29 MHz, 72 dB † ; 52 MHz, 72 dB † .

10 MHz channel spacing: 52 MHz, 110 dB.

Time Warp?

Others may appreciate the record/play

feature more than I did. This feature, which

lets you record off-the-air audio and then play

it back, on or off the air, did not improve much

with the jump from one model to the next. It

could be convenient when helping someone

adjust their audio or compare antennas, but

you’ll have to figure out how it works first.

The manual’s description of this feature is

difficult to comprehend, and using it is far

from intuitive.

The IC-7600 provides separate front-

panel REC and PLAY buttons. It records

continuously, so it can replay the 15 seconds

of audio that you heard before you pushed the

REC button. There’s no on-screen indication

that you’re in record mode (the PROIII has

a blinking on-screen REC indicator). At the

default setting, the radio will play back up

to 15 seconds per “cut.” The VOICE menu

indicates the frequency and recording date

of each cut.

S-meter sensitivity: Not speciied.

S9 signal at 14.2 MHz: preamp off, 79.4 µV;

preamp 1, 33.5 µV; preamp 2, 16.4 µV.

Squelch sensitivity: SSB, CW, RTTY, 3.2 µV;

At threshold, both preamps on:

FM, 0.3 µV.

SSB, 1.2 µV; FM, 29 MHz, 0.13 µV;

52 MHz, 0.12 µV.

Receiver audio output: >2 W into 8 Ω at

2.13 W at 10 % THD into 8 Ω .

10% THD.

THD at 1 V RMS, 0.25%.

IF/audio response: Not speciied.

Range at –6 dB points (bandwidth): ‡

CW (500 Hz): 336-803 Hz (476 Hz);

Equivalent Rectangular BW: 486 Hz;

USB (2.4 kHz): 228-2735 Hz (2507 Hz);

LSB (2.4 kHz): 228-2725 Hz (2497 Hz);

AM (10 kHz): 130-4600 Hz (8940 Hz);

AM (6 kHz): 130-3150 Hz (6040 Hz)

Spurious and image rejection: HF and 50 MHz,

First IF rejection, 14 MHz, 108 dB;

(except IF rejection on 50 MHz): >70 dB.

50 MHz, 84 dB. Image rejection,

14 MHz, 121 dB; 50 MHz, 118 dB.

Transmitter

Transmitter Dynamic Testing

Power output: HF and 50 MHz: SSB, CW, RTTY,

HF: CW, SSB, RTTY, PSK, FM,

PSK, FM, 2-100 W; AM, 1-30 W.

typically 1.2-105 W; AM, 0.7-32 W.

50 MHz: CW, SSB, RTTY, PSK,

FM, 1-100 W; AM, 0.5-29 W.

Spurious-signal and harmonic suppression:

HF, 70 dB; 50 MHz, more than 70 dB.

>50 dB on HF, >63 dB on 50 MHz.

Meets FCC requirements.

SSB carrier suppression: >40 dB.

>70 dB.

Undesired sideband suppression: >55 dB.

>70 dB.

You and Me and Rain on the Roof

The inclusion of selectable roofing filters

several years ago marked a sea change in

Amateur Radio transceiver design. As with

many of its peers, the PROIII did not have this

feature — it used a single 15 kHz wide roofing

filter. The implementation on the IC-7600 is

essentially identical to that of the IC-7700,

with a choice of three crystal band-pass roof-

ing filters at 15, 6 and 3 kHz in the first IF.

ARRL Lab Test Engineer Bob Allison,

WB1GCM, suggests thinking of a roofing

filter as “a first line of defense against any

adjacent strong signals, especially multiple

signals.” The roofing filter follows the first

mixer, and it has the effect of reducing the

passband of the first IF, he explains.

On the IC-7600 you can impose a roofing

filter bandwidth setting of 15 kHz, 6 kHz or

3 kHz on any DSP IF filter setting. Allison

says being able to insert a narrower roofing

filter helps to reduce overloading in the IF

amplifier and mixers that follow; the DSP

IF filtering takes over to help with the rest.

So, the narrower roofing filter does not de-

termine the receiver’s ultimate IF bandwidth

but will enhance dynamic range since all but

the strongest adjacent signals are attenuated

before hitting the receiver’s first IF.

“This is very desirable for CW, SSB and

digital modes,” Allison asserts. He allows,

however, that no roofing filter is completely

Third-order intermodulation distortion (IMD)

3rd/5th/7th/9th order (worst case band):

products: Not speciied.

HF: –31/–35/–41/–48 dB;

50 MHz: –31/–34/–45/–55 dB.

CW keyer speed range: Not speciied.

6 to 48 WPM.

CW keying characteristics: Not speciied.

See Figures 3 and 4.

Transmit-receive turnaround time (PTT release

S9 signal, 16 ms.

to 50% audio output): Not speciied.

Receive-transmit turnaround time (tx delay): SSB, 21 ms; FM, 11 ms.

Not speciied. Unit is suitable for use on AMTOR.

Composite transmitted noise: Not speciied. See Figure 5.

Size (height, width, depth): 4.6 × 13.4 × 11 inches; weight, 22 pounds.

Price: $3999.

*Receiver testing was performed with the bandwidth set to 500 Hz and 3 kHz rooing ilter.

ARRL Product Review testing now includes two-tone IMD results at several signal levels.

Two-Tone, 3rd-Order Dynamic Range igures comparable to previous reviews are shown

on the irst line in each group. The IP3 column is the calculated third-order intercept point.

Second-order intercept points were determined using –97 dBm reference.

**Single beat note. Reduces two beat notes by 45 dB with attack time of 106 ms.

† Measurement was noise-limited at the value indicated.

‡ Default values, sharp setting. Bandwidth is variable; smooth setting is available.

CW bandwidth varies with PBT and pitch control settings.

the button briefly flashes the current notch

setting on screen, although you can disable

this too. In addition to the manual notch, an

automatic notch is available in SSB and AM

mode. It’s extremely effective against multiple

heterodynes, although as broadcasters migrate

from the amateur bands, these are becoming

less of an issue.

The IC-7600’s digital noise blanker not

only lets you set NB level but NB depth and

width. This feature is helpful for pulse-type

noise, such as ignition interference, and it

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