28 April 2009

Empirically obtain the vertical radiation pattern

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H ow would you study the vertical radiation pattern of your omnidirectional antenna? You'd need a signal source flying over the antenna ...

SRI QRT

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I f you were having a CW QSO with me and received a sudden "SRI QRT", as SP3DGV got last night, it means I had to run off to the y...
22 April 2009

FT817 keypad - April 2009 update

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I have added support for a status LED (green), that is ON when the keypad is in the main menu/idle. For single key press functions (such as ...
17 April 2009

First attempts at AO-51

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I had wanted to check how easy are today HAM sats for a long time, until I decided to give them a go few days ago. AO-51 looked like a good...
07 April 2009

WSPR: Beginner's Luck?

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I had to confirm my MP3 WSPR assumptions with an on-the-air test. With the family permission I erected the antenna (base loaded horizontal ...
06 April 2009

MP3 WSPR

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S timulated by a post on the soldersmoke blog and a direct email from Bill N2CQR about simple transmitters for WSPR, I have done some real-w...
01 April 2009

Distributing 12V in the shack

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A ll my RTX and accessories work at 12V. Since I have only one high-current PSU, I had to find a solution to distribute power amongst device...
31 March 2009

Lazy battery pack, an update

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Following the previous post, I have done some measurements. First of all, the DC cable to FT817 does not show unusual impedance. Not the cul...