Transistor linear amplifier for QRP rigs

Somewhen more power is required, e.g. at times of declining sun spot activity. The PA show here is ideally suited for QRP rigs like FT-817, IC-703, K2, SG-2020 etc.

BLA-300plus: 300W Transistor Amp for HF with built in power supply

BLA-300Plus

In contrast to many small amplifier for 12V operations, the BLA-300plus is an amplifier for your station desk. It covers all HF bands from 1.5 to 30MHz and all modes (SSB, CW, AM, FM) and is wel lsuited for QRP transceivers like FT-817, IC-703 etc., but also to get more power from 100W class transceivers, which can then be operated with a lower output power.

Manally switched low pass filters care for a good suppression of harmonics. Of course the amplifier does not need and heat-up time, and except for then band selection no tuning is required. The max. output power is 300W, with a max. allowed input power of 30W with the input attenuator switched on. For reception a pre-amplifier with tuneable pre-selector (10-30MHz) can be selected.

The amplifier BLA-300Plus has an ALC output and a PTT input for transceiver connection, but can also be operated by HF vox. The coaxial connectors are SO-239 sockets (PL sockets). The built-in power supply is suitable for international use with voltages from 110 to 230V AC. Multiple protection circuits support trouble free operation: automatic switch-off at too high SWR or too high temperature.

Additional technical data

HLA-150Plus / HLA-150V-Plus / HLA-300V-Plus

HLA-150-Plus

HLA-150V-Plus

HLA-300V-Plus

Shortwave Power Amplifiers 150/300Watt
Compact and handy linear power amplifiers for all HF bands from 1.8 to 30MHz, with approx. 150 or 300W output power. These amplifiers work real linear amplifiers and not as a C class device, as many simple CB type amps do. A special feature the amplifiers have a six-way output low-pass filter, which is switched automatically by micro processor. Additionally this filter can be switched manually (e.g. when receiving).

The relative output power is shown on a bar graph on the front panel. The amplifiers have a protection circuit against high SWR. Transmit/Receive switching can be done either be HF Vox or a PTT cable. The controls on the front panel allow a selection of the Vox hold time, additionally a 3dB input attenuator can be selected, which reduces the amplification by about 50%.

Connectors: IN/OUT 2x PL, PTT: cinch socket, active low.
The model HLA-150V-Plus has two temperature controlled fans, good for continous operation. The model HLA-300V-Plus has these fans as a standard feature. On high frequencies the output power is slightly reduced, the model HLA-300V-Plus reaches approx. 250W.

Weitere Daten:

Model	HLA-150-Plus	HLA-150V-Plus	HLA-300V-Plus
Frequency range	1.8 - 30	1.8 - 30	1.8 - 30	MHz
Operating Voltage	12 - 14	12 - 14	12 - 14	V DC
Power consumption	24	24	40	A
Input Power	1 - 10	1 - 10	1 - 15	W
Input Power SSB	2 - 20	2 - 20	2 - 20	W
Output Power typ.	150	150	300	W
Temp. controlled Fan	No	Yes, 2	Yes, 3
Fuses	2 x 12	2 x 12	4 x 12	A
Size	191 x 290 x 66	191 x 290 x 80	191 x 450 x 80	mm
Weight	1.8	1.9	3.3	Kg
Price	328.57 (319.00)	349.17 (339.00)	437.75 (425.00)	EUR

Ameritron 500W Transistor PA

Compact solid state amplifier for 12V supply, suitable for mobile/expedition operations. Output power 500W PEP, 400 CW. No tuning required, just switch on and go. Electronic protection against high SWR and over temperature. Power consumption about 80A peak at 14V, separate supply lines 4A for control electronics. Temperature controlled fan, transistors used: 4x 2SC2879. Weight only 3.5kg, size 9 x 22 x 38cm.

Cinch (RCA) cables for PTT and ALC, please see Cables and accessories.