[hpsdr] Hermes board trouble/question

[Kjell Karlsen]

Hello Glen.

I did the same test as you except I have no extra RX. And with the Signal  
Generator set to -100 dBm, the S meter shows -100 dBm at all the  
attenuator settings, only the base level rise. This is how my Hermes has  
always been.

Dumb question; have you done a Level Calibration lately?

73, Kjell, LA2NI


På Sat, 20 Feb 2016 21:00:46 +0100, skrev Glen <glenk4kv at mds-ham.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello,
>
> I am trying to finish up my version of Alex for my two Hermes boards.
>
> I am noticing the exact same thing on two different Hermes, and thought
> someone might
> comment on it.
>
> Under configuration, I have the step attenuator enabled for either  
> Hermes.
>
> I have a rx splitter with a K3 on one side, the Hermes on the other,  
> direct
> into the
> Hermes, bypassing the Alex.
>
> I find a S5-S9 signal on a band, and set both the K3 and Hermes up to the
> same signal.
>
> I see no difference in S meter reading on the step-attenuator setting  
> until
> I reach 16db,
> then it does start to attenuate.  With no preamp on the K3 the S meter
> readings are identical
> with the Hermes, and readability is virtually the same until I hit the  
> 16db
> mark.  Raising the
> attenuator from 0db just raises the G-line on the display, with no  
> effect on
> the signal.
>
> It was my understanding that the Hermes always has a 20db preamp on, so,  
> to
> compare apples
> to apples with the K3,  the attenuator should be set at 20db to show no
> preamp.  If I set it to 20db
> the K3 is probably two S units better than the Hermes.
>
> I think I have the latest Hermes code (3.1)  and PowerSDR 3.3.6 with W10
> with a fast computer.
>
> Whatever is happening is happening on BOTH Hermes, which I thought
> eliminates the hardware...
>
> Can anybody speculate as to what might be the trouble???
>
> 73's
>
> Glen K4KV
> Moultrie, GA
>
>
>
>
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