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2402RE: JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade

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  • graham787
    Nov 8, 2013

       If you select  sent /rect    anyone   opera  thats  as  good as it  gets , activity varies  a  lot  , but  if you  set up and  send , there is  a  web linked  beacon that  alerts  other  users  and places  you  on the  map


      ---In o_p_e_r_a_@yahoogroups.com, <bcarling@...> wrote:

      So far I see a bunch of flags and callsigns and what frequency they are listening on, but it doesn't say OPERA for most.

      On 6 Nov 2013 at 14:05, g0nbd@... wrote:

      To:                            <O_P_E_R_A_@yahoogroups.com>
      From:                         <g0nbd@...>
      Date sent:                  06 Nov 2013 14:05:21 -0800
      Subject:                     [O_P_E_R_A_] RE: JA1ODJ &gt;&gt; KL7L Alaska 3461 Miles 136 KHz ,  -37 dB s/n 5%Fade
      Send reply to:             O_P_E_R_A_@yahoogroups.com


      Originally it was provided to  give a  over  view  of  psk data  mode  activity , but  its now evolved  to show  all  modes  on all  bands , use the  pull  down menus to select  mode /time  etc  , for  a  general over view , ensure  you  have  selected  'anyone'  in the  call  option  


      there is  a data  base that can be  searched  by  SQL via the  web , this recovers  a  excel  spread sheet file

      Just set the parameter senderCallsign=xxxxx rather than receiverCallsign=xxxxx

      callsign=xxxxx does both send and receive reports



      ---In o_p_e_r_a_@yahoogroups.com, <bcarling@...> wrote:

      Thanks. I am ready to try it but didn't understand some of that . First of all, what is "psk-reporter?"

      Bry Carling

      On Nov 6, 2013, at 4:00 PM, <g0nbd@...> wrote:


      No the  mode is  in use  from  audio to  light  , usage  may be  tracked  with the  psk-reporter , usage on the  lower  bands is  notable as  the  on/off keying  and  low  s/n  offers a alternative to the  traditional qrss system , and  provides  accurate s/n (average) and  fade pattern as  % along the  time  lime . OP32 lower decode limit is  round  -40 dB s/n [ref to path-sim] with the  advent  of the  73Khz  band  OP64  -43 s/n  was  added  to the  range and  linked  to the  psk-reporter  as  4000 meter's,

      A combination of  AFC/FEC  and  noise limiting  provides  excellent results  in difficult  circumstances , using  only  'normal'  Ham band  equipment   , the  shorter 30 second / 60 second  modes  provide good  scatter  propagation  on vhf/uhf  , the  afc  tracking  aircraft Doppler 

      136 activity increases during  the  winter  months (northern) at the  moment  Pacific stations are achieving
      quite  substantial range  with  limited power levels  and  Ae  systems , the  modes  immunity  to Doppler  spread  makes it  very suitable  for propagation via   polar path    where spreading  disrupts  mfsk/fsk 

      Question - is OPERA only used on the 136 kHz band?

      On 4 Nov 2013 at 14:15, g0nbd@... wrote:

       Up to  -32 dB  now  !

      Rx at Mon, 04 Nov 2013 13:19:46 GMT
      From JA1NQI in Japan
      Loc QM05DV by KL7L
      Distance: 3444 miles bearing 272°
      Frequency: 0.136 MHz (2200m), OPERA, -32dB

      Dont think you  can  do  much better  than  a  mini-whip , its all  down to  local noise , I think  some  of the  JA stations  have  remote systems , the  other  view is  all  that  wire  could  be  radiating  on 136 , by  coupling  ?

      Hi G,
      TNX  for the links. Lots of interesting equipment at LFengineering. I'm wondering about there preamp for VLF/LF. This is what I'm thinking. Build the DK7FC VLF active E probe circuit and use their preamp or simply use their preamp and add a 4 to 1 audio transformer for second output connection to a sound card for the Dreamers Band RX? I'm wondering  if this setup would be any better then DK7FC  circuit?
      Are you kidding me...? I Hope the JA  station picture is just an optical allusion. Look at all those mains wires. I would be afraid to stand next to his tower much less climb it. How on Gods green earth does he hear anything @ 136 KHz? You go dude..!

      From:  "g0nbd@..." <g0nbd@... >
      Sent: Friday, October 25, 2013 3:49 PM
      Subject:  RE: Re: [O_P_E_R_A_] RE: JA1ODJ  >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade
      Tx station  details 

      Carrier 200W  specifies  power  as 100W (50% duty cycle). 

      Good contact  with  manageable  'safe' power levels  !


      I wonder what kind of antenna he's using?

      From: "g0nbd@..." <g0nbd@... >
      Sent: Friday, October 25, 2013 12:24 AM
      Subject: [O_P_E_R_A_] RE: JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz , -37 dB s/n 5%Fade

      JA1ODJ >> KL7L Alaska 3461 Miles 136 KHz ,  -37 dB s/n 5%Fade F irst JA/USA decode  using  OP32 on 136KHz ,  [no details  of tx station yet] 73-G,

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