.1. LF News
.3. LF links
.6. Build a TX
.9. The Matrix
.11. /P Diary
-LF news past....2006.
21/12. New firmware for the ZL1BPU
exciter. Murray has added a number of new features to version D6b which is
now available from his
website. The DDS can now reference to the 1pps o/p from GPS, has 32 bit
resolution and sends new modes.
20/12. LF operator detects Gamma Ray
Burst? Markus Vester DF6NM has set up a GPS referenced
grabber which is proving to be a very sensitive indicator of
conditions. Recently markus noticed a "glitch" on the Scandanavian chain on
17th which was unexplained by any solar event on NOAA. Alan Melia posted a note
to the Brit Astronomical Association Radio Astromomy Group who immediately
responded with news of a Gamma Ray Burst near that time. Although the times
don't correlate there may be some connection, these events are very rare and
quite difficult for amateur radio astronomers to detect. Read about Markus'
12/12. Swedish station on 505kHz.
From LWCA: Dr Frederick Raab W1FR reported on 11 December: "Gus, SM6BHZ,
(Bernt Gustafson) called me today and said that Sweden's Posts and Telecomms
has given him permission to operate on 500 kHz!" Parameters include a frequency
range of 505.0 - 505.2 kHz with a whopping 20 W ERP. The authorisation runs
until November 30, 2007. SM6BHZ is in Gothenberg, on the west coast of Sweden.
11/12. SAQ on Christmas eve. SAQ
will transmit on Christmas Eve, Sunday 24th December 2006 at 08:00 UTC on
17.2kHz. More info at http://www.alexander.n.se. SM6LKM
has written a sound-card receiver program for SAQ (or any VLF station up to
22kHz), download it here.
4/12. Wavs for SD radio tests.
For anyone that needs to generate or analyse audio files for testing
Software Defined Radios and similar, G4JNT has placed a number of wav file
synthesis and analysis progs here. The file:
WAVDSP.ZIP contains; a programme to up-convert multiple source files into one
large wide-bandwidth stereo I/Q (complex) file, a PSK31 generation utility, CW
message to audio generation, FSK and QPSK, tone generation, parallel tone
testing plus .wav file and I/Q file analysis. Further details are given in
WAVDSP.TXT, included in the archive.
4/10. PA6Z/LX report. Dick
worked about 17 stations from Luxembourg, the best QSO being with RU6LA at over
2,400km. Read his diary here.
3/10. MB2HFC. The RSGB "HF"
Convention is taking place this coming weekend in Crawley, West Sussex
(IO91VC). The LF station will be active at various times from late afternoon on
Friday 6th October 2006 through to around 12.00 UTC on Sunday 8th October. They
may use a new design of TX by Jim M0BMU or an old Decca TX. The signal is
usually very good and they will be active in CW and QRS.
28/9. LX/PA6Z This week. All is
on course for the PA6Z contest group trip to Luxembourg this weekend. Dick
hopes to be active from Saturday evening and will listen for QRS or DFCW around
137.72 and CW around 136.5kHz. Callsign on slow modes will be given as LXPA6Z
to save time. More info at http://www.pa6z.nl
22/9. First amateur 500kHz contact.
The QSO was between Conard, WD2XSH/11 in TN (EM76ge) and Dex, WD2XSH/10 in
NC (EM95tg) a distance of 293 miles. Conard's signal was 339 at first with
QRN/M but improved during the 10 min QSO to 459 with QRN. It would have been
good Q5 copy with lower QRN. Dex's signal peaked 549 at the end of QSO. Conard
was using 100W into a 160m dipole fed as a vertical and Dex was running only 5W
into an inverted L.
15/9. U.S. 500kHz permit issued.
Warren, K2ORS, currently holder of 136kHz permit WD2XGJ, is now one of the
holders of a WD2XSH permit which allows him to use 505 to 510kHz at 20W ERP.
Each station signs WD2XSH/xx where "xx" is their unique identification number.
Warren's is /23, Dex (WD2XKO on 136) is /10. Check the 600 metre group web-site
at http://www.500kc.com/ for more
info. We still await the UK equivalent..
12/9. New utility TX on-air. The
new transmitter near Budapest is currently on-air with tests. Some modulation
schemes cause strong sidebands in the lower part of the 136kHz band. Today the
station is radiating a plain carrier on 135.43kHz. Hopefully it will settle
down to be like the Burg transmission with only occasional
12/9. LX-pedition scheduled.
Dick PA4VHF and the PA6Z contest group will be in LX from September 30th to
October 7th. Callsign will be LX/PA6Z in normal CW & LXPA6Z in QRSS and
DFCW. Normal CW freq 136.5kHz +/-QRM, QRSS/DFCW (3-5 sec/dot) on around
137.720kHz. Dick will try to be QRV around noon (10-11utc) and in the evenings
after 17utc or so. Updates at http://www.pa6z.nl
10/8. Portable pole. Spiderbeam
have just released a
60ft telescopic fibreglass pole. It packs away to under
6ft long and weighs 15lbs. They claim it will support wire aerials and can be
"walked up" by one person. Ideal for a bit of LF portable work!
8/8. Coil calculator. Jim M0BMU
has written an Excel coil calculator to help you design a loading / matching
coil for your LF aerial. Find it on the features
4/8. Lighthouse activity soon.
During the ILHW weekend on 19th and 20th August there will be CW activity
by members of the radio club Voorne Putten around136.540 from 08.00 to 10.00
UTC with the call sign PI4VPO/LT. They will run 120 watts into a 50m toploaded
vertical from the lighthouse NET 074 in Ouddorp on the isle of Flakkee abt
40Klm SW of Rotterdam. Reports are very welcome via e-mail;
7/7. New LF utility TX near band.
The German EFR (Europäische Funk-Rundsteuerung) are to broadcast
control signals for utility companies on 135.6kHz from a site near Budapest.
Although this looks like a potential cause of QRM in the band, the present
sites at Mainflingen (129.1kHz) and Burg (139.0) are mostly plain carrier with
occcasional bursts of data and are fairly benign. The English PDF, linked to
above, shows the new TX service area but gives no other information. The German
version quotes it as 100kW with a 280m mast, similar to Mainflingen in erp.
Info from HA6PX.
29/6. SAQ this weekend.
SAQ, the vintage Alexanderson alternator transmitter will be
on 17.2kHz again this Sunday. Listen at 0830 and 1230 utc.
26/6. MF allocation for UK?
Discussions are progressing on an RSGB proposal sent to Ofcom in 2004. It is
hoped that the RSGB's first choice of 501 to 504kHz may be granted.
There is also the possibility of 500kHz itself being designated a maritime
memorial frequency, but this would be dependent on the length of time certain
countries continued to use 500kHz as an emergency maritime
2/6. 440kHz "Beacon on-demand"
Geri DK8KW has connected his 440.040kHz beacon DI2BO to a telephone line.
If you have a spare moment and want to see if you can hear it, just give it a
call and it will transmit for you. Details on Geri's web-site at
2/6. PA0 expedition tests. Dick
PA4VHF will be testing his 136kHz poratble set up at the club field-day site
over the weekend of June 10/11. This is in preparation for the LX expedition
later this year. Look out for PA4VHF or PI4ZUT that weekend on 136kHz, all
2/6. SAQ this weekend. The last
of the recent series of SAQ transmissions takes place this weekend.
Transmissions start at 1000 on June 5th on 17.2kHz.
25/5. First amateur LF QSO from
Yukon. "J", VY1JA worked Steve VE7SL this morning. They started on QRS60
but signals were so good they ended at 12wpm. J was only running about 30W RF.
He plans to increase this considerably over the next few
21/5. RSGB reflector back
on-line. The RSGB LF reflector at blacksheep.org wasn't working yeaterday
but it came back on line this afternoon. Thanks to the guys at blacksheep for
sorting it out.
17/5. SAQ in CT. Jay Rusgrove
W1VD had a good copy of SAQ this morning despite static.
Hear SAQ at
10/5. SAQ Schedule.
will be transmissions from the Grimeton Radio/SAQ alternator on VLF 17.2 kHz on
the following dates:
1. May 16th at about 09:30-10:30 UTC
2. May 17th
at about 09:30-10:30 UTC
3. May 18th at about 09:30-10:30 UTC
5th at 10:00 UTC 5.
July 2nd is "Alexanderson Day", more details
Info from Lars Kalland
5/5. New 440kHz station. Joining
Walter and his "DI2AG" experimental station is Holger ( Geri ) Kinzel, DK8KW
near Peine, North Germany. He has been granted callsign DI2BO to test
propagation from his more northerly location. No QSOs are allowed but no doubt
reports will be welcome. More news of times and exact frequencies
4/5. "MP" back on 137kHz. Mitch
has his 137k station back on air after the delay in issuing the permit meant he
had to QRT. His loop is working well. QRG 137.7767
29/4. SP0TPAX was active again
over the holiday weekend. The station was activated this time to celebrate the
80th anniversary of an amateur QSO with the USA (U1AAO) from Poland, by Tadeusz
Heftman in April, 1925. He was using callsign TPAX.
27/4. Digital modes for Russia.
Ed Lenichy RU6LA informs us of a change in the regs for Russian LF
operators. From today they can use digital modes such as PSK and Wolf in
addition to CW and QRSS. They still have the 100W TX limit.
24/4. Clicklock! After Peter
G3PLX laid down the guantlet, two programs using his "clicklock" technique for
receiver/soundcard GPS synchronisation have become available. One is "Phase
Scope" by Scott VE7TIL available
the other is " Clicklock2"
from Con, ZL2AFP. For the transmit end, Murray ZL1BPU has incorporated a GPS
lock facility into his
design, look near the bottom of the page.
22/4. ON7YD Aerials page. Whilst
looking for design info on 136khz loops I used Rik's excellent aerials page for
info. Unfortunately the QSL.net servers are so slow that it took five
minutes to download! I asked Rik if I could host a mirror of the page here
on our shiny new servers and he said OK. So here it is. If anyone else would like LF
info hosted on wireless.org.uk I'd be happy to do it.
19/4. TX loop trials in GM.
During my recent visit to New Galloway I tried an "Ashlock loop" and worked
7 countries. Read all about it!
9/4. News from Spain. Manolo,
EA4BVZ has been beaconing in QRSS30 on 137.250 recently and has been received
around Eu. See info on his station here. If you want to
find out what's going on in the Spanish LF scene there is a Yahoo group which
you can read here. To subscribe,
mail email@example.com - it's in Spanish but most members can
read English. Lastly there is Spanish LF news site here and a grabber here.
Thanks to Eduardo, EA3GHS
for the information.
8/4. LF allocation for Greece.
Costas Kralis reports that the Greek Ministry of Transport and
Communications and the Ministry of Defence published the new frequency
allocation tables for Greece last week. As well as positive changes to 80m and
23cm allocations there is reference to amateur use in the zone 130-148.5
6/4. No ZL QSO this time.
Conditions took a dive today so the last chance for VA7LF and RU6LA to make
a trans-Pacific QSO passed without success. A lot of effort was put in by the 3
teams in ZL, UA6 and VE but it all comes down to conditions on the day. ZM2E
was copied by VA7LF and VY1JA in SW Canada yesterday morning and at last
VA7LF's signal was seen in ZL but no QSO was made.
4/4. ZL tests in progress.
Signals from the VE7 end of the tests have been seen around the US and
Canada. We wish them luck. Update
5th. VA7LF will be trying for crossband CW QSOs outside ZL test
times so listen 137.780 from 2000 to 2230 PDST (0300-0530UTC) and reply on 3536
or 7077kHz CW. Daylight tests will take place today (Wednesday) from 1400 hours
through 1600 hours PDST, same frequencies.
3/4. EW6GB QSOs. The first LF
QSOs with Belarus took place recently when EW6GB came on from KO45CN. So far he
was worked by G3KEV, RA3YO, OH1TN, RU6LA, OK2BVG and DL2HRE. I have updated
The Matrix. If you have any "firsts" that are
not recorded please let me know.
2/4. "MP" shut down. Mitch,
VE3OT has been operating experimental 137kHz station "MP" from his Ontario QTH
for the past five years. Unfortunately his permit hasn't been renewed for
another year, probably held up in layers of beaurocracy. It may surface
eventually but until it does MP is silent on 137.
2/4. ZM2E's last chance QSO? The
team is being readied at Quartz Hill near Wellington for the QSO attempts with
VE7LF and R6L starting on Monday. If you want to eavesdrop, frequencies for VE
are 137.7890/137.7886kHz and for RU 137.7886/137.7882kHz. ZM2E's days could be
numbered however, as a huge wind farm with 70 3MW turbines is planned for the
area and the aerials will have to go.
29/3. W5JGV.com updated. Ralph
informs us that his web-site has been updated with new downloads including more
equipment manuals, valve data and surplus equipment info. Link:
27/3. Trans-Pacific tests next week.
VE7MM, VE7TIL, VE7BDQ and VE7SL will regroup at South Pender Island from
3rd. They promise a bigger and better antenna and plenty of RF from a new TX.
They will use a different calling sequence this time, consisting of short (15
minute) calling sequences from both ends, until some propagation is seen then
they will try for a QSO. Frequencies will be the same as last time. (info from
26/3. We're back. On a new
server. Sorry about the delay but normal service is now resumed and we will
have more space to play with. If you find any dead links or things that were
there before but aren't now, please let me know!
24/3. Wolf in"stereo". WD2XES
radiated two simulaneous Wolf signals tonight, one at 5b/s and one at 10b/s.
Both were copied by VE2IQ.
19/3. Disruption of service. I
am changing hosting company for wireless.org.uk so this site may be unavailable
from time to time over the next few days. If you are accessing this via
picks.force9.co.uk it will cease to work altogether. Please re-bookmark
11/3. Asia test success. UA0AET
in NO66la was copied in QRSS20 by Hartmut Wolf in Northern Germany last night.
This is a land path of over 5000km. UA0AGC also took part but only traces were
3/3. Mercury rising. Mike
Staines WM1KE has just released the latest version of his "Mercury" software.
For those who may not know, Mercury is a program that allows you to monitor
other people's Argo sessions over the Internet. It includes many controls to
manipulate/enhance the data.
19/2. SAQ on air. SAQ came
on-air as promised on 17.2kHz between 0845 and 0945utc this morning. Signals
here were 40dB above the noise using Spectrum Lab's "SAQ receiver" preset mode
and an E-field probe fed into the sound card. Further session at 1300. Reports
of good reception from Jay Rusgrove in Connecticut and from W2AMI. W4DEX in
North Carolina could see the signal but not read the CW . Link:
17/2. WD2XNS trans-Atlantic.
Jay's new station made it across the pond last night with good signals into
G3YXM and to Hartmut Wolf in North Germany.
12/2. Good conditions continue.
Trans-Atlantic conditions have been excellent for the past few weeks with
T/A signals being seen every night. Conditions were so good on Saturday that
Hartmut Wolf copied VO1NA's 5wpm CW by ear.
1/2. RU6LA this weekend. Ed will
be active from Machta (KN97LN) over the weekend, Feb 3rd to 5th on QRSS and,
after 2100, CW on 136.6kHz. Between 1300 and 1900 utc on 4th (sunrise in KN87LN
is 1425z) Ed will TX on two HF frequencies, 14.350 and14.212295, beaming to
central Europe in the hope of creating a kind of "Luxembourg effect" difference
signal to be generated at 137.705kHz. Mode will be QRSS 30 - "RU RU RU RU ..."
27/1. SAQ on-air again. The
historic station at Grimeton in Sweden will transmit again on 17.2KHz at 0900
& 1300 UTC on Sunday 19th February. Each transmission will be about half an
hour in length. SAQ is the world's only remaining operational Alexanderson
Alternator Transmitter and has a distinctive note which is well worth listening
for. Link: http://www.alexander.n.se/
24/1. G3XDV makes it to the states.
Mike got his first US report from Jay Rusgrove W1VD last night. Mike was
running 500W RF and estimates his erp is now up to 200mW or more after recent
aerial work. The distance is 5433km. Link:
23/1. 7S6SAJ, the story.
Christer Andersson SM6PXJ and others, have put up a web-site detailing the
story of 7S6SAJ in 2000. They used the big old long wave antenna in Kraak, near
Karlsborg and had 58 QSOs with 13 countries. Link:
21/1. G/VO1 QSO. VO1NA worked
M0BMU (and nearly G3YXM!) last night. VO1NA was using QRSS30 and M0BMU using
13/1. QRP Canadian crosses the pond.
Station "MP" from London Ontario was received by Hartmut Wolf in Germany
tonight. MP is operated by Mitch VE3OT and it only runs 80W to a 50ft
tree-supported vertical. The mode was QRSS60 on 137.777, the distance is
10/1. WD2XDW closes down.
Laurence KL1X is moving again, this time just across town but it means that
he will have to get WD2XDW's Part 5 licence modified (which often takes
months). Another problem will be radiating such a good signal from the new QTH,
WD2XDW has been received from DL to ZL.
9/1. WD2XKO T/A on QRSS3.
Hartmut Wolf has done it again. This time he copied WD2XKO on 3 second
QRSS. He couldn't hear the CW ID though...
4/1. WD2XNS. Jay Rusgrove, W1VD
has at last been granted his Part 5 permit to operate on the 137kHz band. Jay
already has a "Lowfer" beacon (VD) and is a keen listener on LF. We hope to be
seeing signals from him soon. His QTH is Burlington CT, FN31IS.