27 May 2013

3v7 pocket heater

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E verything was looking fine while trying to revive a single 3.7V Li-ion cell with my probably safe(*) method. Cell and voltage regulator w...
21 May 2013

Anatomy of a laptop battery pack

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Three packs at different stages of dismantling A fter successfully reviving 7 out of 8 Li-ion cells (3.7V, 2200 mAh), while waiting for ...
15 May 2013

First experiences with Li-ion cells

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I have been curious for a while about Lithium based rechargable batteries, and how I could get to play with them without investing ...
08 April 2013

23cm biquad and coax

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A fter a long a careful theoretical planning, I moved the 23cm RX-only biquad antenna in a more permanent location, not obstructing the vi...
23 March 2013

UV-3R and external power sources

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W hen a charged battery is inserted into an UV-3R, the radio powers up automatically. This doesn't occur when the battery is inserted, r...
21 March 2013

New Italian prefixes

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T hose of you that spend time on the air will, sooner or later, notice an increase in IU nxyz stations. While it is not a brand new prefix...
26 February 2013

A container for 23cm biquad antenna

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T here is a bit of local activity on 23cm and the RTLSDR dongle allows me to receive that HAM band. An improvised indoor dipole brought in ...
13 February 2013

RTLUSB in VirtualBox virtual machine

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Months ago I was advocating the creation and distribution of a Linux virtual machine image with pre-installed software for RTLSDR work (driv...