VLF earth-mode beacon TX |
If I can get more power into the ground I may ask my wife to help me with some drive tests locally to check earth-mode VLF performance. This is where I REALLY miss my health and fitness. I tire SO easily at present, but have been told this should improve given time and more healing.
Guess I have to slow down and let things take their time and not expect instantly to get better. Apparently I was VERY poorly last autumn - my heart stopped at one point and the first 4-6 weeks in hospital are just a blur - and feel I am almost living a new "second chance" life. Certainly I have never seen a more beautiful springtime.
UPDATE 2045z: In the end the VLF work will have to be later as I am too tired right now. The simplest way of increasing the output impedance is probably to reduce the PRIMARY turns on the 3C90 output toroid s long as the frequency response is OK. This is currently set for a 4:50 ohm step up. Reducing by a few primary turns may be all that is needed. We'll see tomorrow.
3 comments:
Hi Roger,
Do you want to try WSPR-15 on 8.97KHz? I could report back on WSPRnet.
73 Ken G4APB
No thanks Ken.
Tests with a very stable carrier over a 30km range proved negative. I am essentially just testing earth-mode range compared wit the old QTH. Unless within20km of Burwell I think we'd be wasting our time at this stage.
73s Roger G3XBM
Ok Roger,
I have set up my gear to listen out anyway, as it is a useful exercise for me to be sure I can still run the tranverter and amplifier with WSPR-X mode and the 15 min cycle on an RX-TX cycle at 8.97KHz. I am running with my earth rod and ground based Magloop system that worked well on 474KHz. You may see my attempts on WSPRnet on the 'LF' band. I did wonder if the 20 metre raised water table after the floods may assist earth mode. Best of luck with your tests and hope your health lets you get some fun out of it.
73 Ken.
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