Hello Om, IZ7PDX station will come back very soon on MF and LF band ... 73 to all. Luigi
Inviato da iPhone
Hello Andy, all
thanks for the info and for the activity.
I'm at your S-E direction so maybe i have some possibility to
catch your signal. So i will listen in WSPR2 and OP8.
73 and GL
Domenico, iz7slz
On 7/27/2015 3:18 PM, F6CNI - Andy - JN19QB wrote:
Hi to all.
This evening, I’ll transmit to test a single
turn loop on MF.
- 1
Watt HF TX ;
- Mode
WSPR 2 and perhaps also OP 8
- Loop
description :
- Vertical position, top at 11 meters,
bottom at 1 meters over ground ;
- Each side wire is 7 meters long ;
- One single turn copper wire 10 mm
diameter ;
- Maximun lobe NW / SE. Note : at 600 km,
the front / side lobe is about 6 dB ;
- Impedance 0.21 - 113 j ;
- Current wire 2.0 Amperes for 1 Watt
output TX ;
- Top loading using a 3C90 tore isolated
transformer ;
- Base tuning with a variable in parallel
with a fixe capacitor. Total needs around 3000 pF of
total capacitance ;
- 50 Ohms coaxial to the TX ;
- Minimum SWR at TX when the CV is well
tuned : below 1.3 / 1.
Best 73.
Andy. F6CNI
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