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
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J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm