To: rsgb_lf_group@blacksheep.org
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From: N1BUG <paul@n1bug.com>
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Message-ID: <7d6287ac-11fc-bcaf-8880-7d4a468b1dcf@n1bug.com>
Date: Sat, 8 Sep 2018 17:12:53 -0400
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In-Reply-To: <5B94344B.3030503@posteo.de>
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Subject: Re: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
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Reply-To: rsgb_lf_group@blacksheep.org

Hi Stefan,

I think the problem with the 4 character locator could be WSPRnet.
You may have to do some work to get the 6 character locator into the
system. You can read more about this here:

http://qrp-labs.com/images/appnotes/AN002_LT.pdf

But I don't know what kind of confusion having two different
locators for the same call sign may cause in the system.

Higher QRN at night? I often receive stations during the day that I
cannot hear (or with lower S/N) at night but this only happens
during nights with significant QRN.

I have been watching your reports on WSPRnet...

73,
Paul


On 09/08/2018 04:42 PM, DK7FC wrote:
> Thanks to the many stations beeing RX-active on LF WSPR tonite.
> 
> It is very strange, the SNR reported by the stations below 500 km 
> distance was very good in daytime but now at night there are not more 
> stations receiving me, except 2 reports by 2E0ILY.
> Also the software just reports JN39 instead of JN39WI.
> Maybe some reports are not uploaded or shown on the database, because of 
> conflicting locators for the same callsign?
> I can hardly imagine that nothing comes through at night. Very odd.
> Does someone have an explanation what can cause these good results 
> during the day and such bad results at night?
> 
> 73, Stefan
> 
> PS: My QRG is 137.425 kHz and starts each xx:x0 (each 10 minutes). Maybe 
> someone can see somethning on the waterfall display?
> 
> 
> Am 08.09.2018 19:57, schrieb g3kevmal@talktalk.net:
>> Only M0DSZ decoded on 136
>>
>> -----Original Message----- From: g3kevmal@talktalk.net
>> Sent: Saturday, September 8, 2018 4:24 PM
>> To: rsgb_lf_group@blacksheep.org
>> Subject: LF: Re: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
>>
>> Nil to report at my QTH ur QRG 136 USB ie 137.425 RF FREQ
>> 73 GL MAL/G3KEV
>>
>>
>> -----Original Message----- From: DK7FC
>> Sent: Saturday, September 8, 2018 1:45 PM
>> To: rsgb_lf_group@blacksheep.org
>> Subject: Re: LF: RE: 137 kHz WSPR-2 on a 900m long ground loop, this 
>> weekend
>>
>> RR,
>>
>> Now, since 12 UTC the TX is in its final position and runs each 10
>> minutes. It will run for 24 hours or so.
>> So far the results are quite satisfying, for just 10 watts. With 100 W,
>> we could have a CW QSO in the groundwave range. Did you expect that?
>>
>> Let's see what the night brings. Also the radiation pattern will be
>> interesting...
>>
>> More reports from more stations are welcome :-)
>>
>> 73, Stefan
>>
>>
>>
>> Am 08.09.2018 14:02, schrieb Clemens Paul:
>>> Hi Genosse Stefan,
>>>
>>>   2018-09-08 11:56   DK7FC   0.137425   -17   -1   JN39   1   DL4RAJ 
>>> JN68kj   449   103
>>>   2018-09-08 11:56   DK7FC   0.137425   -11   0   JN39   1   DL0AO 
>>> JN59vk 349   89
>>>   2018-09-08 11:08   DK7FC   0.137425   -10   0   JN39   1   DL0AO 
>>> JN59vk 349   89
>>>   2018-09-08 11:56   DK7FC   0.137425   -22   0   JN39   1   PI4THT 
>>> JO32kf 306   359
>>>   2018-09-08 11:08   DK7FC   0.137424   -22   0   JN39   1   PI4THT 
>>> JO32kf 306   359
>>>   2018-09-08 11:56   DK7FC   0.137429   -18   0   JN39   1   DC0DX/RF 
>>> JO31lk   218   0
>>>   2018-09-08 11:56   DK7FC   0.137425   -26   0   JN39   1   DC5AL-R 
>>> JO31lk   218   0
>>>
>>> 73
>>> Clemens
>>> DL4RAJ
>>>
>>>
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: owner-rsgb_lf_group@blacksheep.org
>>>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
>>>> Sent: Saturday, September 8, 2018 1:18 PM
>>>> To: rsgb_lf_group@blacksheep.org
>>>> Subject: Re: LF: RE: 137 kHz WSPR-2 on a 900m long ground
>>>> loop, this weekend
>>>>
>>>> Genossen!
>>>>
>>>> I just matched the antenna and run some WSPR-2 transmissions
>>>> on 137.425 kHz.
>>>>
>>>> I'm getting 260 mA antenna current at 10 W RF power. So the
>>>> overall loss
>>>> resistance should be 150 Ohm (the wire has about 30 Ohm). For
>>>> resonating
>>>> i need about 2.5 nF in series to the wire.
>>>> So the feed point impedance is Z = 150 Ohm + j450 Ohm, still
>>>> behaving as
>>>> a loop. Quite a comfortable managable impedance. I had to wind
>>>> an output
>>>> transformer on a "RIK20" core (Reichelt!), which works very well. The
>>>> secondary number of turns was unknown at the beginning ;-)
>>>>
>>>> Regular transmissions will start in an hour or so.
>>>>
>>>> 73, Stefan
>>>>
>>>> Am 08.09.2018 12:07, schrieb Clemens Paul:
>>>>
>>>>> Hi Genosse Stefan,
>>>>>
>>>>>
>>>>>
>>>>>> Will someone catch the signal at all? At least i'm already
>>>>>> asking for RX
>>>>>> stations!
>>>>>>
>>>>>>
>>>>> I've just resonated my antenna aa inverted L on 137.5kHz (with 502µH)
>>>>> and wil be ready to receive in WSPR-2 as soon as you start.
>>>>>
>>>>> 73
>>>>> Clemens
>>>>> DL4RAJ
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: owner-rsgb_lf_group@blacksheep.org
>>>>>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
>>>>>> Sent: Friday, September 7, 2018 1:49 PM
>>>>>> To: rsgb_lf_group@blacksheep.org
>>>>>> Subject: LF: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
>>>>>>
>>>>>> Genosse Roman, LF,
>>>>>>
>>>>>> Yesterday i built a small LF PA providing 10 W at 50 Ohm. It
>>>>>> consumes 1
>>>>>> A at 12 VDC. I intend to run an over-night WSPR-2
>>>>>>
>>>> transmission (20% TX
>>>>
>>>>>> rate) on saturday night, using the ground loop or earth antenna in
>>>>>> JN39WI. The signal generator is a Raspberry Pi running on a
>>>>>>
>>>> separate 7
>>>>
>>>>>> Ah lead gel accu. The PA has its own 7 Ah accu. The PA can
>>>>>>
>>>> switch from
>>>>
>>>>>> 2.5 W to 10 W :-)
>>>>>>
>>>>>> Will someone catch the signal at all? At least i'm already
>>>>>> asking for RX
>>>>>> stations!
>>>>>>
>>>>>> I'll carry some measuring equipment there, like my M0BMU LF tuning
>>>>>> meter, some Cs, a T106-2 and some wire, also a small ferrite core to
>>>>>> build a transformer if necessary.
>>>>>> What could the feed point impedance be? I have no idea! My modified
>>>>>> MFJ-259B covers LF but i expect it will be overloaded with strong
>>>>>> signals on the antenna, so i try to match the antenna with the
>>>>>> transmitter.
>>>>>>
>>>>>> More soon :-)
>>>>>>
>>>>>> 73, Stefan
>>>>>>
>>>>>> PS: Oh, i'm also going to connect two anti-parallel LEDs to
>>>>>> the antenna
>>>>>> to see if they shine. It is all a big game for old children!
>>>>>>
>>>>>>
>>>>>> Am 05.09.2018 23:54, schrieb Roman:
>>>>>>
>>>>>>
>>>>>>> OK Stefan.
>>>>>>> Try it to do. may be wonderful results.
>>>>>>>
>>>>>>> Roman
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Hello Roman,
>>>>>>>>
>>>>>>>> Yes maybe i'll build a quick PA tomorrow for LF and will
>>>>>>>>
>>>>>>>>
>>>>>> transmit on LF
>>>>>>
>>>>>>
>>>>>>>> for 24 hours, each 10 minutes, WSPR-2. I have no idea at
>>>>>>>>
>>>>>>>>
>>>>>> all how this
>>>>>>
>>>>>>
>>>>>>>> antenna performs on 137 kHz. Is it still a loop or rather a
>>>>>>>>
>>>>>>>>
>>>>>> dipole or a
>>>>>>
>>>>>>
>>>>>>>> mixture? At least it has about the length of a full size
>>>>>>>>
>>>>>>>>
>>>>>> dipole for 137
>>>>>>
>>>>>>
>>>>>>>> kHz. I would TX at 10 W RF power only, so that a small accu
>>>>>>>>
>>>>>>>>
>>>>>> covers some
>>>>>>
>>>>>>
>>>>>>>> hours. But i'm not yet sure if i can find the time to do it
>>>>>>>>
>>>>>>>>
>>>>>> tomorrow.
>>>>>>
>>>>>>
>>>>>>>> 73, Stefan
>>>>>>>>
>>>>>>>> PS: If the antenna acts as a dipole, then it is beaming to
>>>>>>>>
>>>>>>>>
>>>>>> Russia directly.
>>>>>>
>>>>>>
>>>>>>>> Am 05.09.2018 21:42, schrieb Roman:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> Congrts, Stefan!
>>>>>>>>>
>>>>>>>>> We are follow by your success!
>>>>>>>>> Listen, do you planning to operate 136 kHz, I hear, tell
>>>>>>>>>
>>>>>>>>>
>>>>>> me pse - do you planing try to TX with that ant on 477 kHz and 160M?
>>>>>>
>>>>>>
>>>>>>>>> I will be interestin to hear about results.
>>>>>>>>>
>>>>>>>>> 73!
>>>>>>>>> Roman
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>> ---
>>>>>> Diese E-Mail wurde von AVG auf Viren geprüft.
>>>>>> http://www.avg.com