[hpsdr] Alex - Do I need it

[Phil Harman]

Hi Gordon,

Have a look at the Mercury document on the Wiki since this answers your 
question.

In summary it depends on your local situation ( how many strong local 
signals are there) and what natural selectivity your antenna system 
provides.

Many users find no external filtering is required but it depends on 
individual configurations and circumstances.

It's a different story in Europe given the massive strength of the SW 
stations there - I've seen 0dBm at the antenna socket before!

Generally if the ADC Overload indicator is not lit then you are not 
going to see any improvements by adding a front end filter.

If you are going to use Penny to drive a linear amplifier, and it does 
not provide any LPFs of its own e.g. Pennywhisle, then you will need 
the Alex LPFs or something similar.

73's Phil...VK6APH


Quoting Gordon & Lois Duff <glduff at bellsouth.net>:

> ***** High Performance Software Defined Radio Discussion List *****
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