View Full Version : Tokyo Hy-power model hl-45B and fcc regulations on HF amps
03-21-2011, 04:53 AM
I was wondering if anyone knew if this amp is fcc approved for use in the us, i thought the rule was linear amps for below 30 mhz needed 50 watts minimum drive or does this amp meet that requirement in another manner?
03-21-2011, 03:48 PM
The HL-45B is certificated.
It doesn't have 15 dB gain (it has 9.5 dB gain) and includes the 26-28 MHz lockout feature.
"§97.317 Standards for certification of external RF power amplifiers.-
(a) To receive a grant of certification, the amplifier must: (1) Satisfy the spurious emission standards of § 97.307 (d) or (e) of this part, as applicable, when the amplifier is operated at the lesser of 1.5 kW PEP or its full output power and when the amplifier is placed in the "standby" or "off" positions while connected to the transmitter. (2) Not be capable of amplifying the input RF power (driving signal) by more than 15 dB gain. Gain is defined as the ratio of the input RF power to the output RF power of the amplifier where both power measurements are expressed in peak envelope power or mean power. (3) Exhibit no amplification (0 dB gain) between 26 MHz and 28 MHz. (b) Certification shall be denied when: (1) The Commission determines the amplifier can be used in services other than the Amateur Radio Service, or (2) The amplifier can be easily modified to operate on frequencies between 26 MHz and 28 MHz."
50 W would be the limit if we were talking about an amp capable of 1500W out.
The FCC requires that any commercial amp be limited to 15dBw gain.
5W in is approx 7dBw, 45W out is approx 16.5 dBw so it's at about 9.5 dBw gain.
The amp is approved for sale in the US as Array Solutions sells them.