Alpin 100 HF 160 6m Linear Amplifier
The Alpin 100 is a rugged HF + 50 MHz linear amplifier that weighs in at 25kg. This meaty unit is completely self-contained with AC power supply and the rugged GU74B/4CX800 tube responsible for delivering the power. There are still more valve amplifiers about today, even though almost every transceiver now uses a solid state PA device (or devices). And there is probably good reason for the retention of the valve for high power use.
A valve employs a high plate voltage to deliver the power and gain and this results in a relatively low current. It is much easier to obtain a clean output with high voltage and low current swing, and also enables the circuit to employ the well established pi-network variable output tuning which in turn makes it easy to deliver full power into modest VSWRs. On the other hand, a solid state PA operates on a very much lower voltage and to deliver the power and gain, it must draw high currents.This makes it more difficult to generate a clean signal and requires more extensive filtering. It also precludes the use of any form of variable output matching such as the pi-network just referred to. Other considerations are the fact that changing a valve is usually easy, but changing a solid state device often requires major surgery and is not a job that most owners would want to undertake for themselves. If all this sounds as if the balance weighs heavily in favour of the tube, the answer is yes, for many people, but of course there are many solid state linears in use very successfully. But there is one issue with a tube design that has in recent times become an issue.
Input Circuit: Broadband with VSWR less than 1.3:1. Driving Power: 60 Watts (typical).Harmonics: 1.8 - 29.7 MHz > 50dB / 50 - 54 MHz > 60dB. Intermodulation Distortion: > 35dB Below Peak Output. RF gain: 12.5 - 13dB.
Power Supply: 230V AC - 50Hz. Tube: 1 x 4CX800A (GU74B) Ventilated. Dimensions: (W x D x H) 430mm x 383mm x 190mm. The item "Alpin 100 HF 160 6m Linear Amplifier" is in sale since Tuesday, November 22, 2016. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers".
- Brand: Alpin
- Model: Alpin 100