From: "Clemens Paul" <cpaul@gmx.net>
To: <rsgb_lf_group@blacksheep.org>
References: <5B8FD14A.2080403@posteo.de> <14564361536176528@iva5-e9a4c5420a84.qloud-c.yandex.net> <5B904C48.9000302@posteo.de> <13745221536184440@sas1-0a6c2e2b59d7.qloud-c.yandex.net> <5B926595.4090705@posteo.de>
In-Reply-To: <5B926595.4090705@posteo.de>
Date: Sat, 8 Sep 2018 12:07:15 +0200
Message-ID: <106526A3B629406BBA15C3AA514D9EA7@Clemens0811>
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Subject: LF: RE: 137 kHz WSPR-2 on a 900m long ground loop, this weekend
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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
>>>>
>
>
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