Amateur radio blog by Adrian Leggett – Newark – England
This post shows the step by step process of calculating the distance as the crow flies between two points using latitude and longitude of both points. I have used this calculation in logging software I have been continuously developing the last three years.
This post shows the step by step process of decoding a Maidenhead locator code to calculate the latitude and longitude at the centre of a square. I have used this calculation in logging software I have been continuously developing the last three years.
Last year I purchased a Solent 23cm Amateur Television (ATV) transmitter. Although working, it needed a bit of a tidy up. Whilst tidying things up I decided to make a few modifications and place the transmitter in a new case too.
Click the continue button to see more.
Tonight I took part in 144MHz UKAC contest (AR category) using my Yaesu FT-736R transceiver (25w), EA270ZB13 2m / 70cm Yagi made by EAntenna. The antenna is 5 elements on 2m (10.8 dBi) and 8 elements on 70cm (11 dBi).
With the mast at full height, my antenna is 220ft ASL.
Tonight I took part in UKAC contest (AR category) using my Yaesu FT-736R transceiver (25w), EA270ZB13 2m / 70cm Yagi made by EAntenna. The antenna is 5 elements on 2m (10.8 dBi) and 8 elements on 70cm (11 dBi).
With the mast at full height, my antenna is 220ft ASL.
In October 2018 I started using a Comtech 23cm transmitter for my ATV operations. Rather than use the 8-way dip switches to tune the transmitter, I decided to work on a project to develop a rotary LCD tuner using an Arduino Uno as the micro-controller. This article shows how I did it, including the code.
For 23cm Amateur TeleVision (ATV) I am using a Comtech 23cm transmitter powered by a 13.8V power supply.
This article tells why and how I replaced the voltage regulator.
I made these test cards for my Amateur Television (ATV) station on 11th October 2018 using Adobe Photoshop and Camtasia Studio 2018.
Back in May I installed my Tennamast and dual band EA270ZB13 2m / 70cm Yagi made by EAntenna. The antenna is 5 elements on 2m (10.8 dBi) and 8 elements on 70cm (11 dBi).
With the mast at full height, my antenna is 171ft ASL. Tonight I took part in my first ever UKAC 70cm SSB contest.
On 19th January 2017, I started the process of making a printed circuit board for my 23cm amplifier project. I was extremely pleased with the results so thought I would write an article and make a video that shows how I did it.