Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

SOTA activation FL/VL-101 Tour Malakof

For the first time in 2 years I did a SOTA activation again. "Tour Malakof" at 311 meter.

I made 6 QSO's on 40m SSB and 1 QSO on 20m SSB. Conditions were not that good. I was using the mcHF SDR with 10 Watts output. A sloping half wave antenna on 40m, and a vertical half wave antenna on 20m. On a 10 meter fiber pole.

Spot me in the picture below!




Date: 16-07-2021
Summit: FL/VL-101

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

New QRP SDR transceiver!

A few weeks ago I ordered a new transceiver. The mcHF. It's a SDR QRP HF transceiver. It's a kit. There are two kinds of kits. One with all pcb's and components and one with the SMD components already placed on the pcb.

I ordered the kit with all SMD components already placed on the PCB. After a few hours of building the transceiver was ready for the smoke test! It worked. No smoke. There was only one push button that caused the transceiver to power off. After some searching I found a short between two pins of the mpu.

The mcHF worked perfectly after fixing the short. There was just one thing that concerns me. In receive mode the current was 410 mA at 13.8V. The linear regulators where getting very hot. I mounted them on a heatsink but they where still getting very hot. Most of the current is draw at the 5V regulator that is in serie with the 8V regulator. The current at the 8V line was only about 16mA. So if you multiply 0,410 x (13.8-5) is about 3,6 Watt of heat disipation. The transceiver itself uses only about 2 Watt (0,410 x 5 V) .

So why not replace the 5V linear regulator with a switched regulator? Noise?!? I bought a drop-in switched regulator (Wurth 5V/1A Farnell: 173010578) and connected it with a few wires to the mcHF board. It worked. The current dropped to 163 mA. (That is less then a KX3!) After connecting a dummy load there was no increase in noise. So that looks good. I still have to build it in the mcHF enclosure and find out if there is still no increase in noise. But so far so good. The mcHF is now a really cool transceiver!

Note:
It is not a simple modification as a simple drop-in replacement. The thing is you want the input of the switched regulator connect to the DC power input (12-13.8V) of the mcHF not to the 8V regulator. If you do that the 8V regulator still heats up and the improvement is minimal. But if you connect to the DC input there is no way to turn the mcHF off. I think I need something with a pnp transistor to switch the 5V rail off when the 8V rail is off.

Update 28-06-2017:
Today I put the switching regulator inside the mcHF and the noise level increased to about S1. But worse I found some spurious here and there. With stronger ones every 300kHz (the switching frequency). So I think I have to say: Nice try but it didn't work! :-(
So back to the linear regulators. At least I have something to warm my hands on a cold SOTA summit.

More info about this great open source project:
http://www.m0nka.co.uk/

Comments

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Activation summit PA/PA-005 and PA/PA-006

Today I activated two summits in PA. PA/PA-006 Signaal Imbosch 110m and PA/PA-005 Galgenberg (Terlet) 102m.

Both in SSB with a new home brew 50 Watt amplifier. On PA-006 it output was 15 Watt and on PA-005 30 Watt. Reports on PA-005 where indeed a bit better. I used the Yaesu FT-817nd on a 3 cell lithium 3100 mAh battery. The amplifier had its own 3 cell lithium 5200 mAh battery. As with most of my activations I used a End Feed Half Wave antenna on a 10m pole with a home brew tuner.

We walked from a parking place to the two summits and back. Total of 20 km. Nice wetter and beautiful nature.








Date: 11-06-2017
Summit: PA/PA-006

Date: 11-06-2017
Summit: PA/PA-005

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Antarctica 13778 km !

I just made a contact with RI1AND in Antarctica! On the 30m band in JT65 mode. That is a distance of 13778 km!

I used 25 Watt and a 2 x 7 m dipole at 6m above ground. The band seems dead but with JT65, signals can be seen in the waterfall screen and can be decoded. This is so amazing! :-)

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Activation summit F/VO-073 Le Haut Koenisbourg 733m

The first summit in France this year. I went here by bicycle. 16km from the camp site. Climbing the last 8km to the top. Climbing about 500m in altitude.

Because of the terrorist threat and the chatteau attracts a lot of tourists, there were some military police with heavy automatic guns checking everyone's bags. I didn't come for the Chatteau on the summit so they didn't check my backpack with all the wires, batteries and electronic stuff what just might be A home brew explosive. (with some imagination). The 10m fibre mast looks like A riffle! But all went well.

Not many QSO's because after 15 minutes it started to rain. Also my internet connection didn't work so I could not spot my self on sotawatch. But after this activation I figured out how to spot via SMS.






Date: 04-08-2016
Summit: F/VO-073

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Comming SOTA activations

From 4 august till 14 august 2016 I try to do some SOTA activations. I'm in France in the Alsace/Vosges.

I will be QRV in CW on 40m around 7.032 MHz. As I am still a beginner CW OP please be gentle with me. 12-15 wpm with a little more space between the characters will do :-) Please no pile-ups hi!

My equipment:
- Yaesu FT-817ND 1 - 5 Watt output
- 10 meter fibreglass pole
- End feed half wave sloping antenna for 20-30-40m
- QRP Long wire tuner for EFHW antennas
- Internal FT817 battery
- 1900 mAh 10 x AA NiMH battery
- Inline microphone compressor

If 40m doesn't work I will try 30m CW on 10.118 MHz +/- QRM.

Hope to work you!

SOTA sites:
www.sota.org.uk
www.sotawatch.org
www.sotamaps.org

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Flying Pig Rig

Finally I finished building the "Flying Pig Rig" after being in a drawer for years. A 40m 5 Watt CW transceiver kit from Kits and Parts dot com!

It's a single frequency QRP CW transceiver that will fit into a small box. It is lightweight and very power economic. It receives and transmits on 7030.7 kHz. The Flying Pig Rig has a build in keyer. I will use it with my LiPo batteries. With 12.3 volt the output power is 4 Watts! It draws 25mA on receive and 630mA on transmit. Compare that for example to the Yeasu FT-817nd which will draw 300mA on receive and 1.9A on transmit!

I plan to use this QRP rig on some SOTA activations later this year.

More info
www.kitsandparts.com

Comments

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

This weekend SOTA activations

This weekend (1-2 march 2014) I will try to activate some SOTA summits in Belgium. Depending on the wetter and other activities I will try to activate ON/ON-001, ON/ON-010, ON/ON-011 and ON/ON-013.

I will be QRV in CW on 30m around 10.120 MHz. As I am still a beginner CW OP please be gentle with me. 15 wpm with a little more pause between the characters will do :-) Please no pile-ups!

I'm using a Elecraft KX3. 5 Watt output. 10 meter fibreglass pole. End feed half wave sloping antenna. 5000 mAh LiPo battery. QRP Long wire tuner.

If 30m doesn't work I will try 40m on 7.032 MHz.

Hope to work you!

SOTA sites:
www.sota.org.uk
www.sotawatch.org
www.sotamaps.org
www.adventureradio.de

Update:
Things didn't work out as planned! In the car, on the way to the holiday park, my wife told me she had booked a different park then what I thought the holiday park would be! (Amazing isn't!) The park she had booked was more to the west of Belgium. There was only one sota summit with more then one point. So no high score that weekend :-( But still a lot of fun :-)

The summit I activated was ON/ON-006 La Croix Scaille. It was 55 km driving. Walked about 2km. After 30 minutes transmitting it started to rain. I had to quit. The new KX3 worked great!

Date: 01-03-2014
Summit: ON/ON-006

Comments

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Ik heb een prijs gewonnen!

Ik heb een prijs gewonnen! Een aanmoedigingsprijs voor meedoen aan de Marathon van de Benelux QRP Club. Met een score van 58712 eindigde ik op de vijfde plaats (van de zes). 10 Euro!!!

De wedstrijd heet Marathon omdat hij een heel jaar duurt. Van 1 juli tot 1 juli. De bedoeling is dat je zoveel mogelijk verbindingen maakt met een zo laag mogelijk vermogen en met zoveel mogelijk verschillende landen. Nu kijken of ik daar het komende jaar overheen kan komen.

Comments

Deprecated: Function strftime() is deprecated in /home/internet/www.pa7n.nl/pa7n-utils.php on line 107

Reverse Beacon Network

Een poosje geleden had ik al eens een Magnetic Loop antenne in elkaar geknutseld. Die was toen gemaakt van koperen buis. Maar nu heb ik er één gemaakt van 15mm coaxkabel. Ik had hem vandaag even binnen staan en aangesloten op de FT-817. Even een paar keer met 2.5 Watt op de 20m band CQ geseind en via het Reverse Beacon Netwerk gekeken of ik ergens te horen was. En inderdaad, dat bleek het geval. De eerste rapporten kwamen uit Europa maar toen ik de antenne een kwart slag draaide verscheen er ook een rapport van VE2WU. Dat is Canada! Ongelooflijk toch! Zo'n kleine antenne, binnen op zolder tussen de rommel en muren. En met slechts 2.5 Watt.
Hiernaast de foto's van de Magnetic Loop antenne. Diameter is 0.8 meter. Het inkoppellusje is een zogenaamde afgeschermde- of Faraday lus. Volgens de berekeningen zou deze loop een rendement moeten hebben van 35%. De bandbreedte zou dan 12 kHz moeten zijn. Ik meet echter dat de bandbreedte 22 kHz is. Het rendement zou dus nu rond de 15% zijn.

Links:
http://www.reversebeacon.net/

Comments