TNX Marco!
> ehm... Roman
>
> Stefan just mistyped drone instead of done ;-)
> 73 Marco IK1HSS
>
> ----Messaggio originale----
> Da: [email protected]
> Data: 27-giu-2019 11.50
> A: <[email protected]>
> Ogg: Re: ULF/VLF: amateur stair case / carrier transmissions
>
> Gut Abend Genosse Funkamateur Stefan!
>
> Do not understood exactly - whats model of drone? Quadrocopter?
> 20 min so little time, of course.
> We are discuss about transmit power for copter by wires from the ground, not
> batteries.
>
> 73!
> Roman
>
>> Hello Genosse Funkamateur Roman,
>>
>> I'm sorry, the 'drone' was just a typo. I simply meant 'done' instead.
>>
>> 73,Stefan
>>
>> Am 26.06.2019 10:58, schrieb Roman:
>>
>>> Guten morgen Genosse Funkamateur Stefan!
>>>
>>> Congrats with your success!
>>>
>>> Let us to know more details about drone antenna?
>>> We are discuss about that way in 2011 on 136.su forum.
>>> Very interesting!
>>>
>>> 73!
>>> Roman
>>>
>>>> Hi all,
>>>>
>>>> Today, some 20 minute long carrier transmissions were drone from JN39WI
>>>> again. The main intention was to calibrate my local RDF spectrogram
>>>> (still to be done) in the range below 16.4 kHz (JXN) and above 82 Hz
>>>> (ZEVS). So that was a amateur radio ULF/VLF staircase somehow, despite
>>>> the weak signal strength relative to commercial transmitters.
>>>>
>>>> It was a hot day! Far> 30 C here. I started early in the morning and
>>>> enjoyed the fresh air in the forest.
>>>>
>>>> The DC resistance of the 1130m ground loop increased to 73.2 Ohm
>>>> (measured at 1 A) due to the dry soil. It confirms the dependency shown
>>>> in the last year! In 2018 i saw the resistance rising up to 94 Ohm in
>>>> late October, then it dropped to 57 Ohm (-40 %) in just 2 months.
>>>>
>>>> It was interesting to see that the antenna current is much higher at
>>>> lower frequencies (always at resonance | the PA output voltage is nearly
>>>> constant). This effect was very clearly expressed.
>>>>
>>>> IF of interest for other stations (having a data storage):
>>>>
>>>> Frequency/Hz Start time/UTC Antenna current/A
>>>> 970.005 2019-06-25_08:36:20,+20m 2.26
>>>> 2970.005 2019-06-25_08:13:30,+20m 2.19
>>>> 5170.005 2019-06-25_07:51:00,+20m 2.09
>>>> 8270.005 2019-06-25_07:23:00,+25m 1.85
>>>> end of the official part.
>>>>
>>>> BTW, since a few days, the VLF RX site at DL0AO has a 3 axis VLF
>>>> receiver recording data from a Octo-soundcard and a Raspberry pi 3,
>>>> saving data to a 4 TB HDD so there is one more station that won't miss
>>>> anything from now on (for example unannounced transmissions by SAQ).
>>>>
>>>> Some spectrograms may be shown later.
>>>>
>>>> Evetually there was a problem with the sample rate correction due to the
>>>> upheating car, which caused a high deviation of the tracked sample rate.
>>>> The max allowed range of 10 ppm was left in the end of the experiment
>>>> but this was noticed a bit late, maybe.
>>>>
>>>> 73, Stefan
> --
> 73!
> Roman, RW3ADB
--
73!
Roman, RW3ADB
|
