Hi, Stefan.
Not see you last night in WSPR-2.
73, Spiros/SV8CS

Sent: Saturday, September 8, 2018 10:07
To: [email protected]
Subject: LF: RE: 137 kHz WSPR-2 on a 900m long ground loop, this weekend

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

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