Tuesday, 13 February 2018

Bat Call Logger: implementing pre-capture

My bat call logger uses a very simple/crude means to trigger recording.


This seems to work, but a few recordings are blank, as if the triggering signal has stopped before the recorder kicked in.


By having a pre-capture function, I should be able to capture a sequence before the trigger takes affect.

Wednesday, 7 February 2018

Bat Call Logger: Wolfson audio card frequency response

Having got my Wolfson Audio card working happily with a Raspberry Pi 2, I decided to try and check the frequency response.


As this card is described as a 'audio card' and the only figures I've seen relate to the audible range, I didn't have high expectations regarding its use in my Bat Call Logger.


Anyway, to find the answer, it was just a question of setting up some test gear and running a few checks.

Thursday, 1 February 2018

Bat Call Logger: recording ultrasound

My bat project has been on the back-burner for the last few months, as I understand that bats don't venture out much during the winter.


However, the Weather Man on BBC's Winterwatch did say he had seen them flying around on a few mild evenings during January!


So maybe its time to do a bit more work on my Bat Call Logger and check if there are any out there.

Sunday, 14 January 2018

Putting Radio Caroline back on 199 metres

Having refurbished our Bush VHF 54 valve wireless to a point where it is now a working radio, I have discovered that the Medium Wave band is a bit of an electromagnetic desert.


The strongest station in our area is something called Talk Sport, which mostly features two guys talking utter cobblers.


So if this old wireless is going to be more than just a piece of furniture, I need to establish my own radio station.

Thursday, 11 January 2018

Bush VHF 54 refurb: some new valves

A few spare parts arrived this week, so I made some progress with refurbishing this wireless.


Its now a working set, although there is a lack of sensitivity on all wavebands.


However, I can tune in stations on all three wavebands and the tuning scale is now nicely illuminated.

Tuesday, 9 January 2018

Browser Hijack: safety-us.s3.amazonaws.com

I recently came across a smart phone in the throws of a browser hijack.


The user was stuck with a message on the screen and couldn't seem to back out of it.


But as far as I could see, there was a simple way out.

Saturday, 6 January 2018

Ethereum: Help! I've been mugged!

So in the early hours of 27th December I was mugged, and the assailant got away with goods worth over £5,000.


The good news is that I was fast asleep at the time, and nobody was harmed.


However, I probably need to back-track and work out what went wrong with my security measures.

Sunday, 31 December 2017

Bush VHF 54: thermionic valve primer

The next step in refurbishing my Bush VHF 54 wireless is to have a sniff around the valves.


I guess that anyone starting a career in electronics after about 1970 has never had to study (or work with) valves.


So here is a quick and simple primer.

Thursday, 28 December 2017

Bush VHF54: rewiring

Some of the rubber coated wiring in our family wireless was so badly perished that it just snapped and dropped off the wire when moved.


There was a real danger that one of these bare wires would come into contact with one of its naked neighbours, possibly causing damage to the set.


Therefore I just had to remove and rewire the main wiring loom to make our wireless safe.