SM1LCA Kjell is now QRV on 136.8 kHz with 100W TX PWR.
We had a QSO this morning which was a bit of a struggle due to heavy QRN.
This was also the first test of my rotary loop for RX. It is octagonal with 2,8 m
"diameter".
Two turns connected directly to a 1:1 balun, 85 m RG58 and then a simple JFET
preamp.
It is resonant at 140 kHz and can simply be lowered in frequency by
parallelling C's at the RX end.
DCF39 can be brought down from S9+35 to S7. I don't know how deep "nulls" one
can expect (in practice) from such a design. The loop is placed in an old shed some 60 m
from the shack, away from all electrical lines.
73
Christer
sm6pxj
|
