Dear LF/VLF,
Today i saw the first time a flag from Norway on my VLF Grabber (http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html). I would be very fascinated if my signal would be copied in LA/SM/OH (of course, in all countries it would be very fascinating :-) ). Are there any stations, reading the reflector, from there who have the ability to receive on 8.97 kHz (or even 6.47 kHz) with a sensitive and stable RX frequency in DFCW-600 mode?
This would be one of my wishes for this period! One. ;-)
For this weekend i planned the next VLF experiment with the 200m vertical on 8.97 kHz but the wind forecast is not too promising :-( Maybe things look better tomorrow. I have to inform the air traffic control to give out a NOTAM (http://en.wikipedia.org/wiki/NOTAM), 48 hours befor i can start...
I will announce tmw, if i will carry out the next test, if.
The signal would be once again the strongest i've ever radiated. About 50 mW ERP is the goal.
My planned tests for this year on VLF (kite antenna):
- CW QSO to DF8ZR (16 km distance) on 9 / 137 kHz
- Copying my signal on 8970/6470 Hz in Heidelberg in CW (40.0 km, audio recording and later analysis)
- Beeing visible in DFCW-120 in UK
- Beeing visible on the grabber of Renato Romero on 8970/6470 Hz
- Becoming QRV with the 300 m vertical antenna on 8970/5170 Hz, radiating 100 mW ERP at 8970 Hz
- Beeing visible in Russia and at all interested RX stations :-)
- Maybe a TA contact?
vy 73, Stefan/DK7FC *Dreaming...*
24 Sept 2010
More sub-9kHz experiments
Just received this from Stefan DK7FC:
21 Sept 2010
148km on 137.5kHz WSPR!
WSPR reports on 137kHz 21.09.10 |
G3YXM's screen showing my weak signal on 137.471 kHz |
Possible progress on a worldwide MF allocation at WARC 2012
Info on the ARRL website suggests the USA authorities are supporting an amateur allocation at MF. See Secondary Amateur Radio Allocation at 461-469 and 471-478 kHz
Labels:
500kHz
20 Sept 2010
The loop works well on 500kHz TX
Unique reports on 500kHz WSPR this evening |
Loop antenna on 500kHz
My vertical loop antenna (about 80sq m area) made with 1mm diameter wire (tuned with a capacitance decade box) performs quite well on 500kHz judging by reports. Yesterday I lowered the bottom wire to run along the ground, increasing the loop area from about 70 to 80sq m. Reports from M0LMH (223km) and M0BMU (69km) are pretty good with my 1mW ERP signal at M0BMU up to -5dB S/N on WSPR, which is as good as I've ever had and he's not in the best direction for the loop. Also, PA3EGO was up to -2dB S/N on receive. Results on 500kHz are much easier to obtain than on 137kHz although this is explainable by the much lower ERP (probably 20dB less than on 500kHz).
19 Sept 2010
Increasing interest in 137kHz WSPR
WSPR LF activity lunchtime Sept 19th |
Why NOT to use QRO on 136kHz
Andy G4JNT was testing a 600W RF WSPR beacon on 137kHz today when he noticed burning from the plastic shed used to house the ATU. When he opened the door he saw the plastic shed and shelf melting and flames everywhere which he quickly extinguished. LF at high power can be dangerous stuff and one reason why I've restricted my activity to QRP.
Labels:
g4jnt
18 Sept 2010
New all-band SDR from Funk Amateur
SDR transceiver PCB assembly |
The German magazine Funk Amateur has a new all-band 1W SDR transceiver kit in the October edition. This will sell for around $170 US and looks a very interesting project. More details from the link above.
Labels:
sdr
137.5kHz WSPR - best DX now 61km with less than 20uW ERP
137.5kHz WSPR reports so far today - with <20uW ERP! |
From Michael Rainey's blog
http://aa1tj.blogspot.com/2010/09/verweile-doch-du-bist-so-schon.html
Michael Rainey AA1TJ has an excellent blog in which he covers a range of subjects. This post (see link) is about a tiny pocket watch made almost entirely from wood and other organic materials that Michael came across in a museum in Vienna.
Michael Rainey AA1TJ has an excellent blog in which he covers a range of subjects. This post (see link) is about a tiny pocket watch made almost entirely from wood and other organic materials that Michael came across in a museum in Vienna.
Labels:
aa1tj
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