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Thoughts on LDMOS amplifiers?
- Thread starter TIN_CAN
- Start date
As long as you're very careful to match the low drive requirements of these devices, you'll be pleased with the results. Most only require about 1 watt of drive and that usually means you'll need to add a 50 ohm attenuator to the input. Just turning the drive level down on the radio will not prevent dangerous excursions above that level.
This is the main reason you do not see many completed amplifiers being sold at reasonable prices. They simply have no reliability if over driven without sophisticated electronic protection to guard against that possibility. Even the "indestructible" BLF288XR burns up instantly when driven a little too hard.
This is the main reason you do not see many completed amplifiers being sold at reasonable prices. They simply have no reliability if over driven without sophisticated electronic protection to guard against that possibility. Even the "indestructible" BLF288XR burns up instantly when driven a little too hard.
They seem to be giving the most watts per dollar. I would be interested to hear people's experiences.
LDMOS is the wave of the present.
Bipolar is getting to be like tubes were in the mid-to-late 1980s when the last USA tube factories were shutting down.
They won't ever go away completely, at least not for a decade or three. But they'll just fade away.
Year by year.
A little at a time the way RF tubes have been for the last 30 years.
73
Bipolar is getting to be like tubes were in the mid-to-late 1980s when the last USA tube factories were shutting down.
They won't ever go away completely, at least not for a decade or three. But they'll just fade away.
Year by year.
A little at a time the way RF tubes have been for the last 30 years.
73