[hpsdr] strong signal performance for HERMES +ANAN-10

[Helmut, DC6NY]

Hi Peter,

With FW 2.0 it's possible to operate the 31 dB-step attenuator (must be
enabled in the setup and double click on ATT). This S-ATT works correct
indicating the real signal value at the antenna plug. The well-known -20dB
fix attenuator shows a reduced value at the display not indicating the true
signal value.

73, Helmut

 

-----Ursprüngliche Nachricht-----
Von: Peter n Di [mailto:pedroj at bordernet.com.au] 
Gesendet: Montag, 17. Dezember 2012 12:48
An: 'Helmut, DC6NY'; 'Kjell Karlsen'
Cc: hpsdr at lists.openhpsdr.org
Betreff: RE: [hpsdr] strong signal performance for HERMES +ANAN-10

Hi Helmut, Richard and Kjell.

 On Sunday I loaded the V2.0 firmware onto my HERMES to ensure it was up to
date (was v1.8 from TAPR) now the spikes from the local 50.315 MHz beacon
were there _before_ the update but now they are quite a bit smaller in
amplitude ( -20db maybe on some of them ).

I cannot explain this reduction, the antenna has not changed or moved in
azimuth but the simple act of updating the firmware has improved my strong
signal performance, even when pointing straight at the beacon transmitter.

I did have to open up my enclosure to get to the jumper for bootloader but
other than that it is unchanged.  I might have to see if I can revert to
v1.8 and see if they come back.

Regards,
Peter, vk5pj

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Helmut, DC6NY
Sent: Sunday, 16 December 2012 12:59 AM
To: 'Kjell Karlsen'
Cc: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] strong signal performance for HERMES +ANAN-10

***** High Performance Software Defined Radio Discussion List *****

Hi guys,

I don't think that this is an IM issue on the TX side as Richard mentioned.
You can detect the spurs with a single test signal and I did the same test
with my Mercury/Metis  configuration on Atlas. What a surprise, I also found
spurs of the testsignal, but another 20 dB down( totally - 80 dB). Same test
with Mercury/Ozy configuration: no spurs!
Meanwhile I do not preclude mixing products together with the harmonic of
the 25 MHz clock of the Ethernet controller.
Can anybody verify my observations?

73, Helmut, DC6NY



 1355746902.0