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 .
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
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.
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
||2017-12-20 21:42 to 2017-12-21 10:06
||2017-12-21 07:50 to 10:08
||2017-12-21 07:36 to 10:06
||2017-12-21 04:46 to 05:16
||2017-12-21 08:04 to 09:02
||2017-12-20 22:54 to 2017-12-21 01:20
||2017-12-21 05:06 to 09:02
||2017-12-21 01:06 to 05:06
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
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 :-
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.
qrz log1 gb4vbr
qrz log2 gb4vbr
A short days operating from a low G5rv and 100watts using mainly club equipment yielded 8 countries see qrz.com for full details. Thanks to all club members who turned up, and participated in a fun day operating from the Berkeley Vale Railway offices supporting railways on the air.
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.
The commonweath contest is one of the longest running contests on HF.
TSGARC will be sending CW this Saturday as part of the commonwealth contest organised by the RSGB. We will be testing a directional 80m loop as darkness approaches on Saturday evening. All welcome to attend and help or take part. Organised by John M0HFH and Rex G4RAE.
After last nights excellent and informative talk by Gary on Network systems in which a 5G was mentioned, there is a talk at the RSGB meeting in Redland on Monday 28th November by Prof Andrew Nix (University of Bristol) on the 5g network being tested in Bristol.The Network uses Rediffusion infrastructure in the form of underground cabling bought by Bristol University for experimental purposes many decades ago.
Please see the Link to the event below