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Some info of my mept, the main ingredient is a qrp2000 kit that can generate a signal from 3,5Mhz to over 200Mhz,
its controlled from a computer through usb interface with a program called USB_Synth
that makes it possible to generate a qrss or other signals and repeat those signal at a defined cycle, usuly 10minute for qrss.

As the si570 synthesizer cant go below 3,5Mhz I aded a 1/4 divider that makes it possible to operate the 160m band,
it�s based on a 74HC4040 with a small buffer amp, found an kitsandpart schematic that works well.

The BPF is modified by doubling the filters serial capacitor by adding another similar cap in parallel and thereby doubling the extremly narrow bandwith

This box is intended to be used in other experiments as well,
there is a small typo in the jpg, the LPF is 15m.

The kits are available at http://sdr-kits.net and www.kitsandparts.com