29 August 2011

Design engineers still playing with 2nd harmonics (article)

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O ne of the weekly newsletters I receive mentioned an interesting application note from Maxim: Adapting Low-Band ISM Transmitters for High-B...
19 August 2011

Bad luck with an UV-3R

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I have read recently of HAM operators that got out of trouble during a mountain excursion because they had a VHF handy with them. My Standa...
16 August 2011

FT-817 remote "F" button - first picture

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H ere is how my I.F.R. firmware development board looked like once I added the code to show current A/B/C functions: This modification ma...
12 August 2011

FT-817/FT-857/FT-897 CAT emulator

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W hat do FT817, FT857 and FT897 have in common? The documented CAT protocol, for remote control of some functions of the radio. What have ...
08 August 2011

FT-817 remote "F" button - proof of concept

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W hile showing both the Keypad and the IFR to a local HAM, he suggested that it would be useful to have a way to remotely press the "F...
31 July 2011

Reading date/time from GSM network

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S till playing with the serial GSM modem to send SMSes, I investigated a way to obtain a timestamp from the network. Just in case I want to ...
27 July 2011

Differential signal path in transceiver designs (article)

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I n July 2011 issue of AD's Analog Dialogue I spotted this article on RF design: Differential Interfaces Improve Performance in RF Trans...
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19 July 2011

DS18B20 self-heat

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I have been playing with a DS18B20 1-wire temperature sensor, with its default factory configuration: 12-bit resolution, meaning about 0.75...