Метка: amplifiers

SDRs work

Antminer version almost ready. Need to cut circle for amplifier fan, do some cosmetics, screw on MOSFET board for LPF, screw on

Photos and video (RU)

It’s based on a copper plate, big old whipped aluminium radiator and two 100Ohm resistors, 800watt each.

Longer telescopic part for vertical antenna — better SWR on 40m and 20m without a coil: Copper plate for 1.5kW load: Resistors

Not the best, around 20dbc — 26db PEP average, needs some work

10watt power 28dbc — 34db PEP: 10watt power 30dbc — 36db PEP: 5watt power 15dbc — 21db PEP:

102W 26dbc = 32 db PEP (taking average — did multiple measures and they were around this value): 1A current on the

DAC driver output — intermodulations somewhere at the noise floor : 50W 37dbc = 43db PEP: 80W 31dbc = 37db PEP:

No active cooling. Also there are no feedback circuits on both stages and untuned bias on the second.