[hpsdr] ADC Overload

[Steven Doyle]

Hi Mike,

Thanks for the info, thats probably exactly whats happening, I should have 
realized that !

thx

Steve
G1YLB
----- Original Message ----- 
From: "Mike Stevenson" <mike.g8als at ntlworld.com>
To: "Steven Doyle" <steve_doyle at o2.co.uk>; "Graham / KE9H" 
<KE9H at austin.rr.com>
Cc: "HPSDR discussion list" <hpsdr at lists.hpsdr.org>
Sent: Friday, March 13, 2009 9:13 AM
Subject: Re: [hpsdr] ADC Overload


> Hi Steve
> This happens to my setup with an antenna connected due to MW stations, 
> about -18dBm.
> If I insert an ATU to act as a HPF or use a HF beam, all is OK.
> You just need some filtering ie. ALEX.
> Production code did not have the overload indication but but you maybe 
> able to hear the cross modulation due to overload, I can.
>
> Mike G8ALS
>
> ----- Original Message ----- 
> From: "Steven Doyle" <steve_doyle at o2.co.uk>
> To: "Graham / KE9H" <KE9H at austin.rr.com>
> Cc: "HPSDR discussion list" <hpsdr at lists.hpsdr.org>
> Sent: Friday, March 13, 2009 8:52 AM
> Subject: Re: [hpsdr] ADC Overload
>
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Graham,
>>
>> It only happens when I connect to the antenna I think.
>>
>> I reverted back to the production version of the mecury FPGA code, 
>> recalibrated with the XG2 at 50uV(-73dB) and everything worked as 
>> expected. Tonight I will try again with Mecury26, maybe I screwed up the 
>> calibartion, though I don't think so.
>>
>> regards
>>
>> Steve
>> G1YLB
>>
>>
>> ----- Original Message ----- 
>> From: "Graham / KE9H" <KE9H at austin.rr.com>
>> To: "Steven Doyle" <steve_doyle at o2.co.uk>
>> Cc: "HPSDR discussion list" <hpsdr at lists.hpsdr.org>
>> Sent: Thursday, March 12, 2009 11:59 PM
>> Subject: Re: [hpsdr] ADC Overload
>>
>>
>>> Steve:
>>> Does this happen when connected to an antenna, or does it also happen
>>> when hooked to 50 Ohm load, or to the level calibrator?
>>> --- Graham
>>>
>>> Steven Doyle wrote:
>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> Hi,
>>>>  I'm currently running mercury firmware 26 and the latest PowerSDR 
>>>> 28Feb2009. I notice that whenever the pre-amp is on, powerSDR indicates 
>>>> an ADC Overload, this happen on all bands. Probably some setting I have 
>>>> overlooked. For information I performed a level calibaration using 
>>>> Elecraft XG2.
>>>>  Any ideas ?
>>>>  cheers
>>>>  Steve
>>>> G1 YLB
>>>> ------------------------------------------------------------------------
>>>>
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>>
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>
> 


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