[hpsdr] ADC Overload

[wully]

Hi Jeff, All

I agree completely with you. In my own software TRX for HPSDR, I am also 
switching the mercury
to -20db Attenuation, when starting TX on pennylane, because I do also 
get sometimes Overload signals
when not doing the attenuation. Since this is a very simple software 
measure, why not do it that way?

73, Alfred, hb9epu
> Date: Sun, 16 Sep 2012 21:31:01 +0100
> From: Jeff Cook<jeffrie at talktalk.net>
> To:hpsdr at lists.openhpsdr.org
> Subject: [hpsdr] ADC Overload.
> Message-ID:<50563705.3080809 at talktalk.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Dear All,
>
> Lately, and for reasons I know not what of, I've  been plagued with RF
> getting back into Mercury via its antenna input, causing the ADC warning
> to show.  I've noticed that when I run in tx mode with Mercury's
> attenuator switch set at -20 dB the problem ceases to exist.  Would it
> be possible to write into the software the instruction to hold Mercury's
> attenuator switch at -20dB whenever Penelope is tx-ing, and to release
> that instruction when back in receive mode?
>
> Now I know what you will say, and that is, why don't you sort out the
> problem you've got yourself rather than ask a software engineer to find
> a way around it for you?  Believe me I've tried, and to no avail, cable
> layout, station element positions etc.  I'm no engineer of any sort, but
> it seems to me that to turn off Mercury's preamp when transmitting would
> probably be good practice in any event, or am I talking rubbish?
>
>
> Jeff Cook, G0AFQ.