[hpsdr] Hermes

[Warren C. Pratt]

Hi Tony,

As Joe has suggested, the most robust configuration includes filters.  
Some have found them absolutely necessary to avoid overload from strong 
stations nearby.  In my case, I live in a rural area on a mountain top.  
I have several transmitting towers in sight; however, they are about 15 
miles away.  In several years of operating, I've only seen ADC overload 
from on-air signals one time --- that was from a neighbor who is a ham.  
So, the message is that "your mileage may vary."

If you're thinking of purchasing a Hermes and trying to decide about 
filters, you should consider your situation relative to strong nearby 
stations.  Alternatively, if you think you most likely won't need 
filters, you could get the Hermes first and then decide.

Unless you are in an "ADC overload" situation, the filters won't do 
anything to make the reception better --- I believe you'll find Hermes 
quite enjoyable, by the way.

73,
Warren  NR0V

On 2/21/2014 12:32 PM, Tony Hagen wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Hello Joe,
> That means its recommendable to use a HPF or in other words Alex
> Thanks
> 73s
> Tony
> *From:* Joe Martin K5SO <mailto:k5so at valornet.com>
> *Sent:* Friday, February 21, 2014 11:49 PM
> *To:* Tony Hagen <mailto:prosdr at gmail.com>
> *Cc:* hpsdr at lists.openhpsdr.org <mailto:hpsdr at lists.openhpsdr.org>
> *Subject:* Re: [hpsdr] Hermes
> Hi Tony,
> Yes, certainly.
> But of course you won't have any HPF or LPF filtering for the input in 
> that case.
> If you're using the stand alone Hermes as an IF for a converter that 
> has some image filtering ahead of it it works fine like that.  If, on 
> the other hand, you connect directly to an antenna then you are 
> susceptible to ADC overloading from out-of-band strong signals that 
> may be present at your location anywhere in the 0-60 MHz range, 
> regardless of where you have the Hermes tuned, that's all.  It'll work 
> fine but keep in mind that your Hermes ADC is converting signals for 
> everything in the 0-60 MHz range at your location and strong 
> out-of-band signals will affect you much more so than if you had 
> filtering ahead of the Hermes.
> 73, Joe K5SO
> On Feb 21, 2014, at 10:26 AM, Tony Hagen wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi,
>> Is the Hermes Board standalone is capable to receive without the Alex 
>> Interfaced
>> 73s
>> Tony
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