开云体育

Can anyone let me know what this small green pcb is between the 49'r kit and the DDS-VFO??

See it in this image link.. http://www.farrukhzia.com/k2zia/40m-modular-CW-TRX.jpg

			http://www.farrukhzia.com/k2zia/40m-modular-CW-TRX.jpg
			View on www.farrukhzia.com	Preview by Yahoo

Looks to be some sort of balun or filter.. neverthe less what is the purpose and is it available somewhere??

Steve NS3L