Member project · HF amplifier
EVQ100 HF 40m Amplifier
A low-cost HF linear amplifier built around the IRFP150N power MOSFET. The device gives plenty of output on 160, 80 and 40 m — this version is made for 40 m, where most Indian (VU) hams ragchew and where popular QRP rigs such as the BITX40 and uBITX perform well. The aim: a simple 40 m amplifier that makes your signal big without emptying your pocket.
- 90–130 Wpeak output after the LPF
- 5–12 Wdrive at 50 Ω
- 13.8–18 VDC supply
- 40 mthis version only
EVQ100 specifications
| Band | 40 m only (this version) |
|---|---|
| Active device | IRFP150N MOSFET |
| Supply voltage | 13.8–18 V DC — a 20 A SMPS will do the job |
| Drive power | 5–12 W at 50 Ω (ideal for BITX rigs) |
| Peak output | 90 W at 13.8 V to 130 W at 18 V, after the low-pass filter |
| Output impedance | 50 Ω |
| VSWR | 1:1.2 at peak power, with a well-matched antenna |
| Filtering | Built-in 40 m low-pass filter |
40 m only. Match the antenna for the lowest possible SWR before running full power.
Built in
- Reverse-polarity protection
- Cooling fan
- Thick aluminium heat sink to carry away the MOSFET's heat
- Easy to service if anything goes wrong
A closer look
On the air
VU3EUE
OM Shanavas, VU3EUE, from Kozhikode is QRV on 40 m with an EVQ100. Questions about the build? Ask in the comments below.
3 Comments
I have not seen its performance but I think it will be suitable for my set mbitex collected from Lamakan meet.
VU 3 IBC
Puducherry.
you can refer to VU3EUE OM Shanavas from calicut who is QRV in 40m using this amplifier
Nice design
Hello
EVQ hf linear Available?