Updating older hf amplifier america azdg dating 2016
Java Script Disabled Your Java Script appears to be disabled.Java Script is necessary for various functions, such as order checkout, to operate on this web site. Outdated Internet Browser Detected Your web browser appears to be out of date.Modulating this raw power while keeping safety margins on the FETs is a difficult challenge.I am designing a new board to overcome the many problems of the first one.With the MRF101 easily available at about 10x the cost of DMOS FETs but half the price of the RD100xxx devices, they look a superior solution.
As with previous HF amplifier projects, the hardware is open source and the software is closed source.
One major disadvantage - they need at least 25V to operate properly.
As concluded from previous work, it’s practically impossible to persuade DMOS switching FETs to give reliable 1-30MHz RF output.
The older AL811H (prior to drive resistor modification) with good tubes and stable power line, when properly tuned and operating in the linear region, has about 11 d B gain. The largest single problem with significantly greater or less gain (power output) is a poorly calibrated power meter.
The power gain is slightly higher on SSB than on carrier or high average power modes, but the gain will be reasonably close on all bands.