[hpsdr] Latest Software

[Kjell Karlsen]

Hi Hans.

I found one fault I had done when I did the calibration: Alex was not  
selected when I did the calibration. After calibration with Alex selected,  
there is still one problem left: When on 0 dB, the -70 dBm signal shows  
-70 dBm, when only the 20 dB attenuator on Mercury is selected, the signal  
shows -97 dBm. At 10 dB attenuation signal is -70 dBm and for all further  
settings the signal shows -70 dBm.

If I calibrate without Alex selected and RF input to the RX directly the  
result is the same with 20 dB attenuator.

I have tried with both my Mercury boards, no difference.

Does anyone else have this problem?

73, Kjell





På Sat, 17 Dec 2011 17:47:40 +0100, skrev h-hartfuss at t-online.de  
<h-hartfuss at t-online.de>:

> Hi Kjell, Doug,
> I've just checked that on 80, 40, 20m with v2.2.3 (W5WC - 11/30/11) and
> Alex included:
> signal level (S-meter reading) stays constant within 1dB when going
> through the settings between 0 ... -50dB, corresponding to the various
> combinations of Mercury and Alex attenuators. From my point of view all
> works fine.
> Attenuator switching problem with your Alex ??
> 73, Hans, DL2MDQ.
>
>
> -----Original Message-----
> Date: Sat, 17 Dec 2011 11:33:58 +0100
> Subject: Re: [hpsdr] Latest Software
> From: "Kjell Karlsen" <la2ni at online.no>
> To: hpsdr at lists.openhpsdr.org
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Dough.
>
> I have tested the latest software and it works very fine.
>
> There is a difference from before in the calibration: After a
> calibration,
> a -70 dBm signal showed -70dBm with and without the 20 dB attenuator. In
> the new software, the signal strength drops to -97 dBm with the 20 dB
> attenuator. For the rest of the attenuation steps the drop is according
> to
> the settings.
>
> I think the principle from the original calibration should be kept. It
> is
> very convenient to read the real signal strength at all the attenuator
> settings.
>
> 73, Kjell
>
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