Congrats Stefan!
Impressed by your DFCW TX a\t 8 kHz.
Do you use a ground ant at 2970 also too?
73
Roman
> Here is a spectrogram showing the 2970 Hz signal in 3.8 mHz as received
> on the tree. The carrier reached an S/N of 27.57 dB in 166.7 uHz, -10.22
> dB in 1Hz, -44.20 dB in 2.5kHz
>
> 73, Stefan
>
> Am 01.09.2018 21:33, schrieb DK7FC:
>
>> Hi Markus and Paul,
>>
>> Thanks for the efforts to watch out for the signal. I'm surprised that
>> the signal appears at Bielefeld since the 900m ground loop antenna in
>> JN39WI does not really point there, it rather points directly to Paul.
>> No trace in Todmorden? The gain of the loop is on your side! :-)
>>
>> Markus, can you decode a '*' message from the exportet FFT data? 8 dB
>> in 167 uHz could be fine.
>>
>> It was an interesting test of the new equipment. After the 100 minutes
>> at 265 W power consumption from the battery, the display still shows
>> 70 % rest capacity for the next experiment which will follow soon. The
>> H bridge PA stays cool during the transmission. The PA can work from
>> 30 Hz to 9 kHz. I could add another 3 dB by running more power. Since
>> i have to 'wait' during the transmission i can't run a 24 hour
>> transmission :-) It will always be less than 2 hours but i can run
>> more power so we can search for the signal in a higher bandwidth which
>> could be an advantage.
>>
>> 73, Stefan
>>
>> Am 01.09.2018 20:33, schrieb Paul Nicholson:
>>
>>> After cycling through some combinations of filter and
>>> blanker settings, Bielefeld (DL4YHF) is now showing
>>>
>>> http://abelian.org/vlf/tmp/180901b.gif
>>>
>>> About 3.8 sigma, needs another couple of dB.
>>>
>>> --
>>> Paul Nicholson
>>> --
--
73!
Roman, RW3ADB
|
