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2391RE: Re: [O_P_E_R_A_] RE: Sub 9 KHz

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  • graham787
    Nov 3, 2013

      Word  back  from  dk7fc , is he  used  a  separate  primary coil   on this   set up , quite a  few  volts  on the  top  I would  think !



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

      Hi Rich,

      I have attached 2 files which I have based 8kHz matching on & seem to work OK for commercial audio amps. I used a valve guitar amp with good results into dummy load.

      The example is used by a U.S ham for LF but it should give you some help.

      73, Gary - G4WGT.

      On 03/11/2013 15:43, Rickfordg wrote:
      Hi G,
      If you remember a wile back you and others were talking about using off the shelf audio equipment to TX an 8KHz signal. This is the rout I decided to take. I don't think a loading coil will help if I wrong PLS someone let me know. What I want to try is build an antenna and feedline that presents the 4 Ohm (at DC) load that the PA wants for full power out. I'm thinking that a loop antenna will work. What I need to come up with is a feel line other then RG6. I want the feed line to have low resistance at 150 feet such as 10 or 12 Ga wire and put up as much 16 Ga electric fence Aluminum wire to make the loop and feed line present 4 Ohms to the amp. Will this work? Hell if I know...HI HI. Is it fun to try? You Bet...!
      I believe that it could be possible to roll your own 1:1 audio transformer and use the secondary to feed a flying antenna.
      I'm really interested in hearing from Sig. I would like to hear more about his plans.

      From: "g0nbd@..." <g0nbd@...>
      To: O_P_E_R_A_@yahoogroups.com
      Sent: Sunday, November 3, 2013 2:26 PM
      Subject: [O_P_E_R_A_] RE: Sub 9 KHz

      All  the  'dx' worked  on 8K  in EU has  been by the  use of  balloon or  kite   supported  wire  Ae's , with loading  coils  the  size of  40 gallon  drums , can  use  the  ground  as  well  , with  wide  spaced  rods

      ---In o_p_e_r_a_@yahoogroups.com, <wd4rbx@...> wrote:
      Hi Sig,
       First the test was a failure. No signal heard at 6 miles well at least none that I could see on the waterfall . I plan to try another test some time Monday with better RX antenna and a laptop computer.
      From what I understand the weak signal I'm TXing should be over the air. I have plans to put up a multi turn loop but haven't started the project yet.
      I would like to hear about you complete setup for TXing but maybe we should take the conversation off of the OPERA list. If you wish you can Email me direct at  wd4rbx@...

      From: siegfried jackstien <siegfried.jackstien@...>
      To: O_P_E_R_A_@yahoogroups.com
      Sent: Sunday, November 3, 2013 9:14 AM
      Subject: AW: [O_P_E_R_A_] Sub 9 KHz
      6 miles???Hmmm now the question is ... how does 9 kc signal travel that way??? Is it coupling in the power lines?? Through the air??? Or through ground??? Even if you battery power tx and rx ... it coukd couple in anything metallic ... even the fences around your property ... etc. ... I was thinking of using a big fence as antenna (3 turn loop and around 2000 feet each turn ... maybe 2 of them)Dg9bfcSigi
      > -----Urspr√ľngliche Nachricht-----
      > Von: O_P_E_R_A_@yahoogroups.com [mailto:O_P_E_R_A_@yahoogroups.com]
      > Auftrag von Rickfordg
      > Gesendet: Donnerstag, 31. Oktober 2013 13:33
      > An: O_P_E_R_A_@yahoogroups.com
      > Betreff: Re: [O_P_E_R_A_] Sub 9 KHz
      > Hi Andy and all,
      > I will be running another test this morning. I have to go over to W4LES
      > house that's 6 miles as the crow flies. I will be taking my RX setup I
      > tested yesterday with me.
      > It's amazing what can be used for a RX antenna at these frequencies. Many
      > years a go I used a pine tree and well placed ground rod to RX one of the
      > Russian Alphas. I know it sounds crazy but it works. The pine tree antenna
      > was fed directly to my sound
      card and I used Spectrum Lab software for the
      > receiver. The same thing applies here except use OPERA.
      > Rich
      > From: Andy - KU4XR <ku4xr@...>
      > To: O_P_E_R_A_@yahoogroups.com
      > Sent: Wednesday, October 30, 2013 8:32 PM
      > Subject: Re: [O_P_E_R_A_] Sub 9 KHz
      > On Wed, 10/30/13, Rickfordg <wd4rbx@...> wrote:
      > After finding the proper orentation for the loop antenna I was able to
      > copy my
      > Dreamers band signal. I did this just to be sure I was not RXing cross
      > talk
      > amoung the coax or audio cables in the hamshack and was truley
      > a signal. The loop antenna and recorder were placed 100 feet from the
      > shack
      > and 200 from the antenna.
      > Rich
      > WD4RBX
      > __________________________________________________________
      > Question for those who might know: From the experiments done so far; what
      > has been the farthest an 8 KHz signal has been aurally radiated, and
      > received ?
      > No real US activity has been done that I am aware of.. Some talk about it,
      > and
      > one operator did go so far as to build a loading coil, but I have not
      > heard any more..
      > Rich is 104 miles / 167 Km from me, and even if I had the lowest noise
      > receive
      > setup in the world; ..... well, let's just say that I have my doubts at
      > reception..
      > 4 Hours is a Looooooong time..
      > 73: Andy - KU4XR

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