[1000mp] 70 MHz IF tap

[marditti at dslextreme.com]

Tod,

There is another item to consider.
At 70 MHz, the loading by any cable at the tap point may be an issue. 
Therefore, it is necessary to look at some detail at the circuit.  I would
think that any tap must include a buffer with high impedance, low capacity
input.  In addition the buffer should have adequate bandwidth for the
task, but not be to wide band.

Mort, KB6BSN



Tod -ID
> I am looking into tapping the 70 MHz IF signal prior to the entry into the
> roofing filter. The objective is to get a signal which can then be down
> converted to an IF frequency that can be received by one of the single
> board
> Software Defined Radios. There is now available 'free' software that will
> generate a "Bandscope" display on a computer screen using the output of
> such
> single board radios.
>
> If someone has already done this I would be interested in their
> experiences
> before I make my effort to do it. If anyone has ideas on how to do it;
> warnings about potential problems (a) changing the characteristics of the
> original FT1000X or (b) challenges in down converting and/or selecting an
> IF
> frequency to use for the SDR or any other advice I would appreciate their
> comment.
>
> Tod, K0TO
>
>
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