IC-78 | ICOM

ICOM » IC-78

Compact HF desktop transceiver with 30 KHz to 30 MHz double-conversion receiver and 100 Watt max RF output transmitter. Basic features as IF shift, noise blanker, CW keyer, built-in antenna tuner control circuit. Ideated in Japan.

Reference market : ham-radio

General :
Frequency coverage RX 0.0300 ~ 29.9999 MHz [1]
TX 1.6000 ~ 29.9999 MHz [2]
Modulation mode CW / FSK (RTTY) / LSB / USB / AM
Tuning step 1 / 10 / 100 Hz / 1 / 5 / 9 / 10 / 100 KHz
Receiver :
Sensitivity SSB / CW / RTTY 0.16 uV (1.6~30 MHz, 10dB S/N)
AM 13 uV (0.5~1.6 MHz, 10dB S/N)
2.0 uV (1.6~30 MHz, 10dB S/N)
Selectivity SSB / CW / RTTY > 2.1 KHz (-6dB)
< 4.5 KHz (-60dB)
AM > 6 KHz (-6dB)
< 20 KHz (-40dB)
RF preamplifier Yes [3]
RF attenuator 20 dB
Image and spurious rejection > 70 dB (1.6~30 MHz)
IF-shift range ± 1.2 KHz (SSB / CW / RTTY)
± 0.25 KHz (CW narrow / RTTY narrow)
CW features Semi break-in / full break-in
Pitch control from 300 to 900 Hz (default 600 Hz)
Reverse mode L/USB
Noise blanker (NB) Yes, with level adjust
RIT variable range ± 1.2 KHz
Frequency stability ± 200Hz max within 60' warm-up
± 30Hz/h max with temperature of 25°C
± 350Hz max with temperature from 0°C to +50°C
Intermediate frequency ...
455 KHz
Squelch sensitivity SSB / CW / RTTY 5.6 uV (threshold)
Transmitter :
Output power SSB / CW / RTTY 2 ~ 100 W
AM 2 ~ 40 W
Spurious emission < -46 dB
Carrier suppression (SSB) < 40 dB
Unwanted sideband suppression (SSB) > 50 dB
Microphone 600Ω
CW features 6~60 wpm Keyer
Features :
Memory 99 regular memories
1 VFO
Display 1 Hz frequency resolution
30-segments signal meter bar
Antenna SO239 50Ω connector
Power supply 13.8 ±15% VDC external
Power consumption 2A RX, typ
1.3A RX, squelch on
20A TX, max power
Audio power 2W with an 8Ω load
Audio output Jack 6.35 mm headphone
Jack 3.5 mm external speaker
Connections Jack 8-pin (microphone)
Jack 3.5 mm (CI-V remote control)
Jack 6.5 mm (CW keyer)
RCA (ALC)
RCA (send)
Socket 13-pin (accessories)
Socket 4-pin (AH-4 antenna tuner)
Mechanical and environmental data :
Operating temperature from -10°C to +60°C
Dimensions 240 (W) x 95 (H) x 239 (D) mm projections not included
Weight 3.8kg

[1] Guaranteed range 0.5~30 MHz
[2] Not guaranteed for some frequency bands, varies according to version
[3] For 1.6~30 MHZ. The preamplifier functions below 1.6 MHz but sensitivity may be reduced in some cases

Description :

The IC-78, former and export only version of the IC-718 radio device, is a compact HF transceiver. Features such as 99 memory channels, high C/N ratio on PLL, direct channel entering, data communication capabilities and more, offer easy operation for anyone. The transceiver delivers a powerful 100W of output power and its one-piece die-cast aluminum construction, combined with a large heat sink, helps keep internal temperatures down and ensures that operation is stable at high duty cycles. The IC-78 is equipped with a large LCD, easy to read, and a minimum number of switches. This allow for superior feature selectability, also keys access functions directly with no secondary function key. A well-designed double-conversion system to help minimize image and spurious responses for better signal fidelity, is also built-in. The combination of the low IMD first mixer and new PLL circuit allows superior basic receiver performance.

When the optional CR-338 crystal unit is installed, it allows up to ±0.5 ppm of extremely high stable operation. An optional 2nd IF filter can be installed into the transceiver, providing 5 passband widths selectable. These the optional IF filters available : FL-53A for 250Hz@6dB (CW/RTTY-N modes), FL-52A for 500Hz@6dB (CW/RTTY-N modes), FL-222 for 1800Hz@6dB (SSB-N mode), FL-96 for 2800Hz@6dB (SSB-W mode), FL-257 for 3300Hz@6dB (SSB-W mode).


Filter construction on 2nd IF

With an optional IF filter installed into the IC78 the filter selection switches the passband width as shown in the table :

Filter SSB CW RTTY AM
n/a 6 kHz* [wide]
2.4 kHz [normal]
6 kHz* [wide]
2.4 kHz [normal]
6 kHz* [wide]
2.4 kHz [normal]
6 kHz [normal]
2.4 kHz [narrow]
FL-52A 6 kHz* [wide]
2.4 kHz [normal]
0.5 kHz* [narrow]
6 kHz* [wide]
2.4 kHz [normal]
0.5 kHz [narrow]
6 kHz* [wide]
2.4 kHz [normal]
0.5 kHz [narrow]
6 kHz [normal]
2.4 kHz [narrow]
0.5 kHz* [narrow]
FL-53A 6 kHz* [wide]
2.4 kHz [normal]
0.25 kHz* [narrow]
6 kHz* [wide]
2.4 kHz [normal]
0.25 kHz [narrow]
6 kHz* [wide]
2.4 kHz [normal]
0.25 kHz [narrow]
6 kHz [normal]
2.4 kHz [narrow]
0.25 kHz* [narrow]
FL-96 6 kHz* [wide]
2.8 kHz [wide]
2.4 kHz [normal]
6 kHz* [wide]
2.8 kHz [wide]
2.4 kHz [normal]
6 kHz* [wide]
2.8 kHz [wide]
2.4 kHz [normal]
6 kHz [normal]
2.4 kHz [narrow]
2.8 kHz* [narrow]
FL-222 6 kHz* [wide]
2.4 kHz [normal]
1.8 kHz* [narrow]
6 kHz* [wide]
2.4 kHz [normal]
1.8 kHz [narrow]
6 kHz* [wide]
2.4 kHz [normal]
1.8 kHz [narrow]
6 kHz [normal]
2.4 kHz [narrow]
1.8 kHz* [narrow]
FL-257 6 kHz* [wide]
3.3 kHz [wide]
2.4 kHz [normal]
6 kHz* [wide]
3.3 kHz [wide]
2.4 kHz [normal]
6 kHz* [wide]
3.3 kHz [wide]
2.4 kHz [normal]
6 kHz [normal]
2.4 kHz [narrow]
3.3 kHz* [narrow]

[1] Can be used when the expanded filter selection is turned on in the initial set mode.

Review :

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