Re: LF: 136.96kHz testing

[Roger Lapthorn <rogerlapthorn@gmail.com>]

The measured power out from the PA is actually 250mW going into the earth electrodes. As a test I connected a PA0RDT designed active antenna run from a 9V PP3 battery and connected this to the (deaf at 136kHz) FT817 and went for my walk across the fields. The signal was copyable (not strong) at 0.4km with 10wpm CW. Signal was stronger if I held the E-field probe above my head.

Those of you like Mal who work multiple continents on the band will thing this is nothing, but it gives me a starting point from which to progressively improve my system. I'm just amazed that 250mW into earth electrodes 20m apart can be heard Q5 at 0.4km with a 19 inch whip handheld.

More fun next week...

73s
Roger G3XBM

On 18 July 2010 17:14, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

This is the very beginning of my journey onto 136kHz....

For anyone very very close to Burwell, Cambs, JO02DG, I'm putting a QRP 10wpm keyer-generated CW message (later to be changed to QRSS3) out on 136.96kHz CW into my earth electrode antenna. Power from the TX is about 500mW, so ERP is just a few microwatts at most. 

I'd appreciate reports, but be amazed to get any until I start to run some more power into a real antenna.

73s
Roger G3XBM


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G3XBM    GQRP 1678      ISWL G11088

-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088