Museums on the air GB4TDM 16/17th and 23/24th June 2018

TSGARC will be operating from Thornbury and District Museum on Saturday 23rd June 2018. see :- http://www.thornburymuseum.org.uk
The Nov and registration for the event are completed.
http://www.radio-amateur-events.org/IMW/index.htm our IMOTA reg no 5311

we will be operating 2m ssb cw and FM . Plus HF and will have a table outside of the museum to welcome members of the public.

2m Mobile Fox Hunt Test Beacon

Today 4th and tomorrow 5th  June 2018 between 19.00 hrs and 21.00 hrs at a  frequency of 144.450 Mhz I will be have a propagation beacon running at 5 watts CW QRS < 10wpm

The message is repeated at less than one minute intervals.

location :-

Longitude : -2.52344 W (-2° 31′ 24” W)
Latitude : 51.61649 N (51° 36′ 59” N)
QTH locator : IO81RO

Useful for testing your equipment and map reading skills for the mobile fox hunt on Wednesday evening. Please leave a reply on the page if you pick up the beacon at your location also practise reading the Morse code sent.

Club Dipole – WSPR To the Antarctic 13597 km

In preparation for tonight’s talk on WSPR experiments, the club antenna has been transmitting at 200mw (20dbm) so that live data from DX explorer is available. Band conditions during the early hours were good and a signal was received by DP0GVN in the antarctic at 04:04 am. sn ratio -28dbm around 0.001mw .

John m0hfh

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

 

 

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.

Field Day Antenna’s

We have erected Two antenna’s and some tuning is underway,

The first is a ZL7 2-2m 7 element special Yagi on lone to us by Andy ( G7OPB) from Berkeley; on Sunday we measured the resonant frequency  144.4 to 145 bandwidth of approx 600khz however the swr at best was 1.5 and the antenna resistance at resonance was approx 75 ohm.We are in the process of making up a 1/12th wavelength coaxial matching feed to reduce the swr below 1.5.

This antenna will be linked to the club 2m all mode.

the second antenna is a ZS6BKW similar to the g5rv with modified dimensions; we have carried out some initial tests and linked this to the club manual ATU which gave us the following bands for use:- 80m, 40m,20m,15m,10m.

12m and 17m band could not be tuned. Test qso to St. Albans and Coventry gave us 599 on 10w.

This antenna will be linked to The Club Yaesu 450d and we will check that the internal ATU can match the bands as above.

Any other antennas which are erected would be welcomed for comparison.

All members are welcome to use the club rigs during field day.