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...

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.