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Thursday 3 July 2014

SDR improvement, an update

I have taken delivery of the two connectors needed to fit to the top of the lid of the metal container that will hold the RTL-SDR stick and the coolant (which will be vegetable oil), and have set up the USB port to be a type B on the outside of the case, in line with USB specifications and to allow the connector of the RTL-SDR to connect.

The next job I have to do is drill two holes in the lid, one to accommodate the USB connector (which turned out to be a little smaller than I initially thought) and the BNC connector, these will be sealed up with silicone sealant to stop oil escaping through the connectors, the RTL-SDR stick will then be placed inside the can, connected to USB and antenna first, then the can will be filled with oil as far as possible, the lid fitted, and the edges sealed up to prevent leaks.

As I plan to upgrade the motherboard in the machine to a more recent model the shack computer will be used, the board swap will mean a port change and reinstallation the drivers for the stick, this is not a problem for me, I have at least 3 compatible antennas for this new setup, or 4 depending on how you look at it, these are my Nagoya NA-771 2/70 antenna, 2 Intek KA-520 antennas (one is a bit bent but I think it works), and the stock antenna of the Midland 42 (I do not know the manufacturer's designation for it).

The RTL-SDR should run cooler after this and should not drift or require the offset to be changed, also reception without an antenna should be either heavily reduced or eliminated.

so, I can start to get this thing built and will try and order the parts to upgrade the shack computer this weekend, which I have already chosen.

73 de 26CT730

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