Wsprlite antenna testing – Rex G4RAE 6371 km

This week we have been testing Rex’s 1/2 G5RV,  East / West, height less than 20ft.

The wsprlite classic was set to transmit late on Saturday afternoon, a tuner and MFJ analyser were used to tune to the 40m band. Rex confirmed that stations receiving the signal reflected the spread of QSO’s he had made over many years.

Note the time of the signal being received in America.

above indicates the variable propagation; note that from Jan 7th at 21.00 the propagation is rising and is more stable.

and finally a map of the received signals taken from http://wsprnet.org

 

 

Outside Amateur Radio

Last week Mike G0JMD spoke about a few radio related topics that while not directly amateur related  provided some good talking points.

He talked about how he first came across Amatuer Radio while in the army.

Other subjects included scanners, CB and ADSB recieving.

Mike showed some of the kit he has used over the years and talked of others that he had which caused some interesting discussions and memories from other members.

Thanks Mike for a good evening.

WSPR lite antenna testing update Average distance: 2195 km

map of stations hearing M0hfh from our club 40m dipole for the last 24 hour period

The Dx10 table note the max distance 3683 km

Dx10 graph  indicates changing propagation sunrise today Bristol  8.14am

Pick a time for your long range Transmission to win the club competition!!

Think we need more data and a plan for that. comments appreciated.

John

 

 

WSRPlite antenna test resumes

After a small setback (a flat battery) we have resumed transmission using a mains power supply. I have included the DX10 table showing the  best 10 (in terms of range) . The DX10 table gives you a snapshot of the system performance. However it does more as it identifies the time ranges for the spots so that you can identify the best times for DX openings.

DX10: M0HFH – 7 MHz – 200mW

Distance (km) Call Spots count Last seen
2720 EA8BFK 4 2017-12-20 21:42 to 2017-12-21 10:06
2047 OF5C 4 2017-12-21 07:50 to 10:08
1817 OH8NW 2 2017-12-21 07:36 to 10:06
1644 HA7MAC 2 2017-12-21 04:46 to 05:16
1546 SM0BYO 1 2017-12-21 09:46
1538 SM5EPO 3 2017-12-21 08:04 to 09:02
1480 HG5ACZ 2 2017-12-20 22:54 to 2017-12-21 01:20
1405 SM4JST/RX1 9 2017-12-21 05:06 to 09:02
1398 OE3BUB 3 2017-12-21 01:06 to 05:06
1384 OE6PWD 1 2017-12-20 23:04
Average distance: 1698 km

 

the map below shows the spots in a more visual form and comes from http://wsprnet.org

using filters M0hfh on 40m for the last 24 hours

 

 

Wsprlite test of the club 40m dipole under way

Today at around 4.pm I connected my wsprlite antenna analysis system to the club 40m Dipole after completing the 40m low pass filter. It is now transmitting at 200mw and here is the first image from the spots map. The test will continue for 3 days, i will publish data as the test progresses.

for info on the system :-

https://www.sotabeams.co.uk/wsprlite-classic

Arduino workshops

Last week was the second week with Paul m0zmb  showing  some of his experiments using the Arduino open source electronics platform.  We looked at a full colour LCD display from Tony G0WMB and my (John m0hfh) experiments to link the Arduino and a AD9850 dds module to give a variable sine wave output with a variable frequency from a few kilohertz to 30mhz; a very useful VFO. We stayed later than we should  to test the output using the club radio on 3.5mhz and 7.2mhz  and the circuit achieved our first goal, and a signal was detected at approximatly 4m distance using very crude wire antennas.

Railways On The Air at Vale of Berkeley Railway

On Saturday 23rd September 2017 the club will be running a special event station for ROTA at Sharpness. Setup from about 09:00 with aim to be on air by 10:00.

If you are planning on coming please bring a handheld and call GB4VBR on 145.500 to gain access as some parts of the site are restricted due to the nature of what they do there.

Please do not park in front of the houses on either side of the road, if you come along.