DD7PC 137KHz Setup
Yaesu FT-857 -> 10.137KHz Signal to Mixer with 10MHz LO. Outcoming 1mW Signal through a low-pass to a TDA2030 5W PA. From this small driver PA to my big 250W G0MRF Mosfet PA. Output actually ~180W to again a low-pass filter to the loading coil/Variometer to the longwire antenna!
Here some pictures:
Schematic
Mixer
with Driver and Mosfet PA (in the back power supply, Teletron TE-704 and Ropex
Transmitter)
now all parts installed into an old PC tower:
loading coil +/- 7.5mH (calculated with DF8ZR tool) - PVC Rohr 25cm Durchmesser, 207Wdg., 0.95mm CuAl, L=23cm)
with commercial Hagenuk Variometer (0.1-06mH) and current meter
30m
wire from 1st floor with loading coil to Mast 1-3
Mast
Nr. 1
Mast
Nr. 2
Mast Nr. 3 (end of the garden)
current 200-400mA
Antenna-Wire in Nov/Dec.2011 much higher over the roof installed which increased my ERP a lot. Calculated by DF6NM -> 9mW ERP