The Acom 600S is the first and long awaited transistor amplifier by Acom. The amp is characterised by a very high robustness, very easy operation and relatively leight weight. This makes this PA especially useful for DX-peditions and portable operations. The output power is max. 600 W on all bands (160 to 6m), all modes, no limitations. The heart of the ACOM-600S are 48V type MOSFET transistors made by Freescale, a type which is made to withstand even some SWR mismatch without problems.

Operation with the ACOM-600S is very simple. Required are just a PTT keying line (negative ground) and HF from the transceiver. An input power of 25 to 30 W is sufficient for full output power. The wideband input circuit is designed to offer a flat SWR of 1.2:1 to the transceiver. Band switching is done automatically, the amplifier senses the input frequency. Numerous security checks prevent operation in case of an error. The last 28 incidents are logged with many data points for later diagnosis.

The large colour LC display shows all important data at a glance: output power, reflected power, temperature, band and much more. Settings are controlled with a clearly arranged menu system and six push buttons below the display. A CAT/AUX interface can be used optionally for communication with the transceiver. All usual transceiver CAT systems and protocol types are supported. Additionally a seria lRS-22 interface can be used for remote control.

The power supply shows the focus Acom has put on international use of the amplifier ACOM-600S. The power supply is suitable for all AC voltages from 85 to 132 and 170 to 265V. The inrush current is limited automatically, a very good power factor correction (PFC) is used to fullfill inuterbational industry standards. Together with the automatic adaption to varying input voltages this makes the amplifier very well suited for use with power generators, changing input voltages etc. The ACOM-600S does not provide an automatic tuner. Up to an SWR of 2:1 the amp will work without trouble, up to an SWR of 3:1 only with reduced power and above 3:1 it will switch off with an error message.



a) Standard frequency coverage (*):

1.800 - 2.000 MHz

3.500 - 4.000 MHz

7.000 - 7.300 MHz.

10.100 - 10.150 MHz

14.000 - 14.350 MHz

18.068 - 18.168 MHz

21.000 - 21.450 MHz

24.890 - 24.990 MHz

28.000 - 29.700 MHz

50.000 - 54.000 MHz

(*) Extensions or changes of the frequency coverage are possible after negotiations with the manufacturer.

b) Rated output power: 600W +/-0.5dB, PEP or continuous carrier, without mode limitation.

c) Intermodulation distortions (IMD3): better than 28dB (30dB typically) below the rated PEP output.

d) Harmonic and parasitic emissions output suppression: better than 60dB (65dB typically).

e) Input and output impedances:

- nominal value: 50 Ohm unbalanced, UHF (SO239) type connectors;

- input circuit: broadband, SWR below 1.2:1 (1.1:1 typically); 1.8 – 54 MHz continuous range without

retuning or switching;

- RF by-pass path SWR - below 1.1:1, 1.8-54 MHz;

- admissible SWR at the output load (the antenna): up to 3:1 with proportional power reduction and up

to 1.5:1 for full output power;

f) RF power gain: 14dB +/-1dB (typically 25W for 600W output power);

g) Mains power supply voltage: 85-132V with 10А main fuses and 170-265V with 6.3А main fuses, 45-

66Hz, single phase;

h) Mains power consumption at full output power: 1500VA or less with a power factor of 0.95 or higher;

i) Mains power consumption in Low Energy (waiting) mode: less than 1VA;

j) Complies with EU safety regulations and electromagnetic compatibility standards, as well as with the

US Federal Communications Commission (FCC) rules;

k) Environment working conditions:

- temperature range: -10ºC to +40ºC (14ºF to 104ºF);

- relative air humidity: up to 95% @ 35ºC (95ºF);

l) Dimensions (projections not included) and weight, operating: (W x H x D) 330 x 165 x 380 mm (13 x 6.5

x 15 In); 12 kg (26.5 Lbs).


a) Receive / transmit control:

- KEY-IN input – type Phono (RCA) jack socket; voltage fed to the open transceiver key: not exceeding

+12.6V; current through the closed transceiver key: not exceeding 6mA;

- not obligatory KEY-OUT output – type Phono (RCA) jack socket; output resistance: not more than 120

Ohm; maximum admissible input voltage from the transceiver (across an open KEY-OUT output):

+50V; maximum admissible current through a closed KEY-OUT output: 20mA;

- minimum dead time, necessary for safe amplifier switching from receive to transmit: 10ms between

transmit request at the KEY-IN input jack and the RF drive appearance at the RF INPUT connector.

b) Frequency control directly from CAT interface of the transceiver – connector CAT/AUX (connector type


c) Remote control through RS232 interface (connector type DB-9).

d) Remote turn on through simultaneous activation of the signals DSR/DTR and CTS/RTS on the RS232

(type DB-9) connector.

e) Remote turn on / turn off line – “ON_RMT” input on the CAT/AUX (DB-15) connector; DC voltage pulse:

+4.5 to +15V DC towards ground for 1-2s; input current: 3mA maximum.

Storage and shipment

a) Environment conditions for storage and shipment:

- temperature range: -40ºC to +70ºC (-40ºF to 158ºF);

- relative air humidity: up to 75% @ 35ºC (95ºF);

- above sea-level: up to 12000m, including the luggage compartment of aircraft.

b) Dimensions and weight at transportation (max): (W x H x D) 480 x 280 x 440 mm (18.9 x 11 x 17.3 In);

14.5kg (32 Lbs).