Saturday, 7 April 2018

Bat Call Logger: full-spectrum analysis

With the recent step change in the weather, I was able to run the system last night and capture bat calls for the first time this year.


It looks like my modifications to the system are paying off.


I'm now getting full-spectrum (ultrasonic) recordings which are much easier to analyse than the previously used Frequency Division recordings.

Saturday, 31 March 2018

Radio Caroline: visiting the Ross Revenge

Over the Easter weekend of 1964, the M.V. Caroline dropped anchor a few miles off the Essex coast and started broadcasting popular music.


A certain 12 year old, super-glued his ear to the family wireless, and within 3 weeks was joined by 7 million other listeners. Within a year, there were over 20 million of us.


Who would have thought that 12 year old would still be listening to Radio Caroline 54 years later?

Friday, 23 March 2018

BBC Radio iPlayer: download & convert to MP3

If I'm going on a long drive, I like to be able to listen to radio "plays" to ease the journey.


As BBC PodCasts give way to iPlayer Radio, this is becoming increasing difficult.


So now I have to use get_iplayer to download a programme, and ffmpeg to convert it to MP3.

Thursday, 22 March 2018

BirdBox 2018: time-lapse video

For 2018 I thought I'd try to gather periodic snapshots from my Maple tree bird box.


The idea is to make a series of time-lapse videos.


I'm hoping to capture nest building and maybe show the chicks growing from tiny naked blobs to fully feathered birds.

Saturday, 17 March 2018

Hantek 6022BE on Lubuntu 17.10: OpenHantek

My Hantek USB oscilloscope was supplied with Windows software, but how can I run it on Linux?


There are a couple of FOSS options for Linux including OpenHantek and Sigrok.


I have tried both Sigrok (with pulseview) and OpenHantek, but I much prefer OpenHantek.

Thursday, 15 March 2018

Radio Caroline on 648kHz: great coverage with just 1kW

When I first heard about Caroline's plans to transmit on the Medium Wave, I was skeptical.


I couldn't see the point in running a community type radio station on just 1kW of power to cover a limited coastal region of East Anglia.


But I've changed my mind   ...Now I get it!

Sunday, 4 March 2018

Bat Camera: just a wild idea!

What if I triggered a camera from my bat detector?


I'm not looking for prize winning bat photos, just a possible aid to identification.


Would the system capture anything recognisable?

Friday, 2 March 2018

ZeroLiPo: Pi push-button battery power control

The ZeroLiPo is a Lithium-ion Polymer battery power manager for the Raspberry Pi from Pimoroni.


It does not handle battery charging, it simply converts the LiPo 3.7Volts to 5Volts, and provides a low voltage alarm.


Although I've had one of these for ages, I've only just considered using it, possibly for my Bat Call Logger.

Monday, 26 February 2018

Nature with Tech 2018

Although we have had some very bright, sunny days during February, it has also often been very cold.


And it looks like we have some seriously cold days to come during early March.


However, there are still some signs that our garden birds are thinking about nest building...