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: [email protected] 
>[mailto:[email protected]] On Behalf Of DK7FC
>Sent: Saturday, September 8, 2018 1:18 PM
>To: [email protected]
>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: [email protected]
>>> [mailto:[email protected]] On Behalf Of DK7FC
>>> Sent: Friday, September 7, 2018 1:49 PM
>>> To: [email protected]
>>> 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
>>>
>>>      
>>
>>    
>