RM Italy

RM Italy KL503HD 300W High-Drive 10/12m Amplifier w/ Preamp

SKU: KL503HD
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$649.99 CAD

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For the serious operator with a high-power radio, the RM Italy KL503HD is the amplifier you need. This is the "High Drive" (HD) model, designed specifically for modern 100-watt transceivers that have been turned down, or 50W+ mobile radios.

This 12V amplifier takes your high-power input and boosts it to ~150W (AM/FM) or ~300W (SSB). It also features a switchable 26dB receive pre-amplifier to help pull in weak, distant stations. If you have a high-power radio and need a reliable, feature-rich amplifier, the KL503HD is the answer.

⚠️ CRITICAL: For HIGH-DRIVE Radios ONLY

This is a HIGH DRIVE (HD) amplifier. It requires a powerful radio to operate correctly. It will NOT work with low-power QRP (1-10W) radios.

Minimum Input Power: 1W (AM/FM), 2W (SSB)
Maximum Input Power: 35W (AM/FM), 70W (SSB)

You MUST turn down the power on your 100W HF transceiver to match this range. Applying more than 70W will destroy the final transistors and void the warranty.

Warranty & Installation Notice

Please note, linear amplifiers require appropriate licensing to install and operate. These units are not designed for a 100% duty cycle. All units are fully tested and inspected before shipping; however, there are no returns and a limited (Manufacturer's) warranty applies.

RM Italy is located in Italy, and warranty claims must be processed with the manufacturer. Setup and testing should only be performed by qualified individuals.

⚡️
150W (FM) / 300W (SSB) Output: Provides a powerful signal boost for high-drive radios on AM, FM, and SSB.
📈
High-Drive Input Circuit: Designed for radios with 1W-35W (FM) or 2W-70W (SSB) of input power.
👂
26dB Receive Pre-Amplifier: A switchable, high-gain preamp helps you hear weak signals, dramatically improving your radio's receive performance.
📡
Wide Frequency Range (25-30 MHz): Covers the 12-Meter and 10-Meter Amateur bands, as well as the 11-Meter CB band.

🇨🇦 Canadian Band & Licensing Information

This amplifier is designed for the 10-Meter (28-29.7 MHz) and 12-Meter (24.89-24.99 MHz) Amateur Radio bands. Operation on these frequencies requires a valid Amateur Radio Certificate issued by Innovation, Science and Economic Development Canada (ISED).

Use of this amplifier on the 11-Meter (CB) band or any other frequency outside of the Amateur bands is not permitted in Canada. Operation on the 11-Meter band is license-free but is strictly limited to 4W (AM) or 12W (SSB) of power.

Technical Specifications

Specification	Detail
Model	RM Italy KL503HD
Frequency Range	25 - 30 MHz (12m & 10m Bands)
Input Voltage	12 - 14 VDC
Max Input Current	30 Amps
Input Power (AM/FM)	1W - 35W
Input Power (SSB)	2W - 70W
Output Power (AM/FM)	~150W
Output Power (SSB)	~300W
Pre-Amplifier Gain	26 dB (Switchable)
Fuse	3 x 10A
Connectors	SO-239 (UHF Female)
Dimensions (L x W x H)	210 x 170 x 62 mm

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