Uk Antennas End fed half wave

Thinking about a suitable antenna for use with a kite i decided to purchase UK antennas multi band end fed.

end-fed-antenna-with-mounting-bracket-80-40-20-17-15-12-10m

It seemed sensible to test the antenna matching before attaching it to a kite however the half wave for 80m was too long to put up at my QTH so i swapped it out for a half wave on 40m and attached it to the matching unit; using a mini VNA and MFJ 259B  i set about matching the radiator. The starting point indicated resonance at 6.6mhz so trimming the length i slowly brought it to resonance at 7.04mhz with vswr of 1: 1.2. To achieve this i had to attach a counterpoise of 3m, my only criticism being there was no attachment point for a counterpoise.
The screen shot shows the WSPR test at 200mw from my QTH on the 09/08/2020.
A  CW QSO into Kazakhstan at 50 watts was also achieved, it seems to work well.

Conclusion
Great antenna IP65 rating with good mounting clamp setup will report back when i test the full 80m half wave antenna supplied with the unit at field day.

John m0hfh

2m Fox Hunt

The fox hunt on Wednesday evening turned into a damp affair and was attended by Mike g0jmd, Paul m0znb , Garry g7nvz and John m0hfh. Peter Barnes m0swn was the fox who had gone to ground in the Mundy Playing fields accompanied by Brittany M6LVB. First hound to see the fox was John m0hfh using body shielding and a hand held, second was Garry g7nvz and Paul m0znb bringing up the rear. We had a cream cup cakes as our prize and returned to rock street around 9.15, a fun evening.

End fed Resonant Half wave project

To help with construction a Photograph of the Primary and Secondary connection.

If you are using a single connection box keep the primary at one end and the capacitor used in the Tank circuit at the other.

Keep the connecting wires as symmetrical as possible

Boxes suitable for this project Screwfix.com  Part no. 33991 and 35121

80m ARDF testing Tonight

Weather is not great for this event however the Mundy playing fields has a car park. The 5 watt Transmitter will be operating from 19.00 hrs this evening, 3.568mhz CW and can be received in Alveston at 599 so try your receivers on the way over and report the distances. The second transmitter will be <1 watt @ 3.579.3 Mhz cw and will be at the Mundy playing fields in Thornbury;decode the Identifiers for both signals and report your findings via qrz or the website or to John m0hfh.

Both transmitters send the club callsign initially G4ABC , with a short message for just over a minute which is repeated at approximately 30 second intervals.

thanks

John

Chirp and Drift

The Fists CW club have some competitions (NOT CONTESTS)  organised for the bank holiday week and weekends 22nd to 27th of May.
www.https://fists.co.uk/activitiescalendar.html
If you have a vintage radio and would like to Chirp and Drift or warm it up for a few hours Rex and I will be around to help send or receive some slow morse.

How about some AM (amplitude Modulation) ! pre- arranged as its not a popular mode.
The 2m refresher looks interesting, 2 hours per day finishing at 9 pm, Rex and I will be operating from the ridge or Rex’s QTH with a beam for that event.

Let us know if you would like to join us for a cw qso 5 wpm or as slow as you can manage.

perhaps some practise at club on Wednesday.

Smiths Charts, Practical Application of mathematical RF matching

For The past 2 weeks you may have noticed some activity at the top of the room , with instruments, a 2m copper tube dipole multiple VNA’s and computers.
I am planning a project and talks on the practical application of smiths charts method of mathematically matching RF loads. There is some way to go before we are in a position start the talks, feel free to ask questions. On Wednesday evening we will be running a capacitor workshop again making values to implement a match created by smiths chart calculations.

2m ARDF Practise Night 25/07/2018

This evening two beacons will be operating from 19.30pm to enable testing of 2m ARDF equipment for the Pedestrian fox hunt on the 1/8/2018.

Beacon 1 will be low power < 0.5 watts from the Chantry Gardens Frequency 144.525 mode A1A. Tx every minute.

Beacon 2 operating at 5 watts mode A1A from IO81RO NNW of TSGARC club.

TX every 30 secs. reported 599 in Alveston 3 miles away.

If you identify the call sign and unique identifier please leave a reply.