Contact me at: Copyright Notice: Commercial use of the material contained in this site, all schematic diagrams, circuits, designs and related materials is prohibited without express, written consent of the author. But if you want to spare some money you can consider purchasing their cheap counterpart made in Russia or even at Eimac. Due to the input capacitance of the tube, which is also transformed by the step-up transformer therefore at Tsunami: pF — pF a broad band transformation for several bands is absolutely impossible. This situation exists with or without the HV-interlock. Greg Latta alias AA8V. But on the other side I can confirm you that the same tube manufactured by Eimac shown also mechanical problems.
160 meter High Power Band-Pass filter 4 kW
HF Tube Amplifiers
This is a wiser advice than using an amplifier at all costs and be unable to use it properly or to hear your correspondent. The neutralization of the unit is carried out with heating and control grid voltage applied. The main unit can be installed up to 3 meters 10 feet away. In each case, the input impedance will be practically of a similar value. As in the other schemes, the plate tuning capacitor needs to be rated at 2X the DC value. Circuit Diagram Screen Grid.
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DC9DZ: Project Tsunami – Power Amplifier (PA) using 4CXD
The photograph illustrates this mounting method. If you have ever tried to use the 80 meter phone band for local communications on winter evenings, you probably experienced situations where under Km propagation was almost nonexistent. The ONLY way to be safe is: Never put your hands or a conductive tool inside any amplifier unless it is unplugged from the electric mains. This involves removing the half-wave rectifier [D16] and replacing it with a c. These few examples of behaviours do not respect either the ham spirit nor your health and are not very useful. A built-in, wide-range antenna tuner matches loads with high VSWR up to , often eliminating the cost and complexity of an external, high-power antenna tuner. Vinyl tape is not recommended.
So a compromise "Q" is chosen to balance bandwidth against minimum attainable SWR. The phenolic insulator from the interlock or a threaded ceramic spacer is used to replace the aluminum spacer under RFC1. Unlike RF voltage breakdown ratings, for intermittent applications like CW and SSB, the RF current ratings of wire and relay contacts may be increased; the only tradeoff being a slight decrease in overall efficiency. These few examples of behaviours do not respect either the ham spirit nor your health and are not very useful. Why using so much power? The live weight of this PA amounts to 1. Step: Transmit on CW-mode with about 10 W directly into the input connector of the amplifier's grid input.
2 years ago