markt@hpiacla.HP.COM (Mark Thompson) (02/18/88)
In an article mentioned here "Building the 2 meter cube radio" in which a RS weather radio is converted to recieve 2 M it was mentioned that a crystal filter in the front end would be a nice inprovement. My question is this; has anyone seen or does anyone know of such a filter for a 2M reciever. Any advice on how to design or lift such a circuit would be appreciated. I have built made the changes to that cube and it was quite satisfying but the selectivity was not to great. I assume that the purpose of a crystal filter would be to make the reciving band more narrow and thus more selective. Thanks in advance for your help.