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On Fri, 18 Mar 2005 06:36:33 GMT, "Pete KE9OA"
wrote: I would go directly from 45MHz to 455kHz..............this is typical in HF receivers. An NE602 mixer can be used for the 2nd mixer and a 44.545MHz crystal used with the on-board oscillator allows you to derive your 2nd I.F. Alternatively, you can use a TDA1572 as the 2nd mixer/I.F./ demodulator. This is also a good system and it will give you fairly good strong signal handling capability. Pete it is almost like the gunnplexer RX units we made around 1978-80, wonder if the pcb's still exists for such receivers? JM --- J. M. Noeding, LA8AK, N-4623 Kristiansand http://home.online.no/~la8ak/c.htm |
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