Метка: amplifiers

Wolf RU4PN QRP Unit some tests

Just transmit on 20m band before little tuning (after tuning of the bias I’ve got around -54dbm of 2d harmonic). 60db att:

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: