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Title: Bc-604/FT-241 Xtal for SDR Conv Post by: KB3DKS on July 09, 2011, 02:29:02 AM I'm probably missing something here but could you use one of the 4XX KC BC-604 Xtals for mixing down the 455kcIF into a sound card?
Also wondering about using the 50KC IF from a Halli receiver, SX101? directly? This sounds too simple to work. Bill Title: Re: Bc-604/FT-241 Xtal for SDR Conv Post by: G3UUR on July 09, 2011, 06:37:58 AM Bill,
I don't see why it shouldn't work. The only problem might be the "black death" which plagued plated FT241 crystals and acoustically damped them so much that many now won't oscillate, even in pretty vigorous oscillators. Dave. Title: Re: Bc-604/FT-241 Xtal for SDR Conv Post by: w3jn on July 09, 2011, 03:07:21 PM Believe most of the Softrock designs use a Johnson counter to provide the necessary LO phases - so you need a xtal 4X the injection frequency.
Title: Re: Bc-604/FT-241 Xtal for SDR Conv Post by: G3UUR on July 10, 2011, 04:51:24 AM You're absolutely right, John. I was only thinking of converting 455kHz down to 50kHz, and not what the sound card needs in the way of I and Q channels for SDR. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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