A portable Softrock V9 receiver
I decided that I wanted to take my Softrock V9 portable, so I put it in a diecast box, along with an SLA battery and a simple active antenna. I fitted a telescopic whip, a bnc socket for an external antenna, and a charging socket. When the switch is off, the charging socket is connected to the battery and the battery is completely disconnected from the radio.
The switch on top is for the active antenna, and the mini-din socket on the front is for the usb and audio connections to my laptop.
This unit, along with my laptop, forms a complete 900KHz to 30MHz HF receiver with a panadaptor display covering +/- 48KHz and the ability to instantly tune into a signal anywhere in that range with the click of a mouse.
If you are interested in this fascinating aspect of ham radio, there is a yahoo mailing list and a number of excellent web sites on the subject.
Here are some links that may be useful:-
The home of WB5RVZ and the main Softrock resource pages
Craig Crozier, AB9IV, has collated Rob's links into two pdf files to make downloading easier. Click on these links to download them- Lite_Xtall_RX-V9_0_Assembly.pdf and BPF-Assembly.pdf
Clifton Laboratories- some very thoughtful information on sound cards and a very good high-isolation rf buffer amplifier
The home of Rocky, in my opinion the easiest sdr program to start with, this is the one I use.
More excellent information on sdr and Softrock
Everthing you ever wanted to know about Digital Signal Processing
And when you are ready to take the plunge, this is where to order your kit from.