Loading ...
Sorry, an error occurred while loading the content.

67468Re: [softrock40] Re: Chnd:ghosdr3-Alex in Ubuntu controlling Softrock Ensemble II

Expand Messages
  • Sid Boyce
    Aug 9, 2012
    • 0 Attachment
      Not surprisingly, that's why I was recommending a 12V battery test as ground loops are difficult to avoid when multiple grounds form a PC, PS, etc. are present.
      73 ... Sid.
       
      On 09/08/12 14:16, John Tucker wrote:
       

      Mike,
       
      I put a 12V, 1A wall wart power supply on the softrock and the Harmonics decreased drastically. So that seemed to be a big help.
       
      Thanks.
      John
      N8MDP
       
      Sent: Tuesday, August 07, 2012 10:42 PM
      Subject: RE: [softrock40] Re: Chnd:ghosdr3-Alex in Ubuntu controlling Softrock Ensemble II
       
       

      If you disconnect the antenna ... do the "harmonics" go away?
      If not, its USB noise and the soundcard needs better filtering of its regulators .... or you have a ground loop.
      Mike KC7NOA


      To: softrock40@yahoogroups.com
      From: ars_n8mdp@...
      Date: Wed, 8 Aug 2012 02:15:15 +0000
      Subject: [softrock40] Re: Chnd:ghosdr3-Alex in Ubuntu controlling Softrock Ensemble II

       
      Sid,

      I put a choke on the 12V input line. Didn't make much of a difference. The harmonics are still there. For now, I will make the LO offset 12000 vs. 9000. At least you can listen without the annoying tone.

      By the way, are you hearing audio from my SDR? One of my buddies down the road has a son that just got their license and is a Linux guru. He installed QtRadio and he is not getting any audio from my stream. Just wanted to confirm if you were hearing anything from my radio.

      Looks like I got the Softrock calibrated properly. The system appears to be working as I had hoped. Now I need to move on to getting the tablets running to my expectation and then get jmonitor working on my website.

      More work in progress!!
      Regards.
      John
      N8MDP

      --- In mailto:softrock40%40yahoogroups.com, Sid Boyce <sboyce@...> wrote:
      >
      > As it's a RX you could try a 12V battery which would isolate it from any
      > induced noise from the PS or ground.
      > 73 ... Sid.
      >
      > On 07/08/12 22:52, n8mdp wrote:
      > >
      > > I shifted the LO offset to 12000. That moves the receive area both for
      > > LSB and USB away from the harmonic noise for now. Nice clean audio.
      > > Will still check the power supply.
      > >
      > > --- In mailto:softrock40%40yahoogroups.com
      > > <mailto:softrock40%40yahoogroups.com>, "n8mdp" <ars_n8mdp@> wrote:
      > > >
      > > > That can be checked relatively quickly. I never thought about that.
      > > I am using a combo 5V/12V power supply. I can try my 13.8V supply for
      > > my Kenwood to see if that makes a difference.
      > > >
      > > > Radio is back on the net. I have to re-calibrate the radio as I
      > > can't pick up the local AM radio stations and the SDR seems to be off
      > > by 4.8Khz on the low side.
      > > >
      > > > Work in Progress!!!!
      > > >
      > > > John
      > > >
      > > > --- In mailto:softrock40%40yahoogroups.com
      > > <mailto:softrock40%40yahoogroups.com>, David Turnbull <dturnbull@> wrote:
      > > > >
      > > > > On Tue, Aug 7, 2012 at 1:57 PM, n8mdp <ars_n8mdp@> wrote:
      > > > > > I did that. It is very clear to me that the solid line and tone
      > > I see and hear are harmonics at +/- 9kHz of the local oscillator Freq.
      > > > >
      > > > > That could be from a switching power supply.
      > > > >
      > > > > 73 David AE9RB
      > > > > http://AE9RB.com/
      > > > >
      > > >
      > >
      > >
      >




      -- 
      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
      
    • Show all 63 messages in this topic