RM Italy KL703 500W Linear Amplifier with Receive Preamp
The RM Italy KL703 is a 500W maximum-output linear amplifier with a three-position LOW/MID/HI power control and a switchable receive preamplifier. It accepts 1–35W input across its supported modes. Two heatsink-mounted fans provide active cooling.
Key features
- Maximum output: Manufacturer-rated 500W.
- Input range: 1–35W across supported AM, FM, SSB and CW modes.
- Output control: Three-position LOW/MID/HI selector.
- Receive preamplifier: Switchable from the front panel.
- DC supply: 13.8V nominal with a 60A supply rating.
- Cooling: Two heatsink-mounted cooling fans.
- Size and weight: Approximately 16.54 inches long × 9.45 inches wide × 3.54 inches high; approximately 9.37 lb.
Specifications
| Specification | Manufacturer rating |
|---|---|
| Model | RM Italy KL703 |
| Frequency range | 25–30 MHz |
| Modes | AM, FM, SSB and CW |
| Maximum output | 500W |
| Input power | 1–35W, all modes |
| Supply voltage | 13.8V DC ±1V |
| Power-supply rating | 60A |
| Maximum current draw | 50A |
| Output control | Three-position LOW/MID/HI |
| Receive preamplifier | Switchable |
| Input VSWR | 1.1–1.5:1 |
| Fuses | Four 15A automotive fuses |
| Dimensions | Approximately 16.54 inches long × 9.45 inches wide × 3.54 inches high |
| Unit weight | Approximately 9.37 lb |
Setup requirements
Check the driving radio's RF output before switching on the amplifier. Never exceed the 35W input limit, and do not use the amplifier's output selector as a substitute for reducing excessive drive at the radio.
Use a suitable DC supply and correctly rated wiring. Allow clear airflow around the heatsink and both cooling fans, and connect a properly matched antenna system or suitable dummy load before transmitting. The antenna, coax and test equipment must be suitable for the operating power and frequency.
The manufacturer specifies a maximum bypass power of 50W with the amplifier switched off. Avoid prolonged high-duty-cycle transmission and allow the heatsink to cool as needed.
US operating restriction
External RF power amplifiers must not be used to increase the transmitting power of a US CB Radio Service station. This amplifier is not a legal CB power upgrade. Observe all applicable equipment-authorization and operating requirements.
Frequently asked questions
Is the KL703 a radio?
No. The KL703 is an external linear RF amplifier that works with a separate transceiver. It is not a standalone radio.
How much input power can the KL703 accept?
RM Italy specifies 1–35W input in all supported modes. Do not exceed 35W. Reduce the driving radio's output rather than relying on the amplifier's power selector to make excessive input safe.
What output power does RM Italy specify?
The manufacturer specifies 500W maximum output. This is the amplifier's maximum rating, not its required operating level.
What power supply is required?
Use a 13.8V DC supply rated for at least 60A. RM Italy lists maximum amplifier current draw of 50A; supply capacity and maximum amplifier draw are separate specifications.
Does it have adjustable output power?
Yes. The KL703 has a three-position LOW/MID/HI output selector on the front panel.
Does it have a receive preamplifier?
Yes. A front-panel control switches the receive preamplifier on or off.
How large is the KL703?
Converted from the manufacturer's specifications, the unit is approximately 16.54 inches long × 9.45 inches wide × 3.54 inches high and weighs approximately 9.37 lb.
Can I use it to increase CB transmitting power in the United States?
No. US CB Radio Service rules prohibit using an external RF power amplifier to increase a CB station’s transmitting power.
*These units are for industrial, scientific, medical, or export use only. It is a violation of US FCC regulations to operate these units on the Citizens Band or Amateur Radio Services in the United States. Please check regulations in your country before operating these unit.