6M

  

Below is a picture of my 6M antennas (M2 6M7 - 7 elements @ 85', homebrew 6 element Yagi's
which I call a 6M6HA's on a different towers at 66' and 78', and a 6M7JHV which was converted to
a 6M7HA @ 95' with a higher impedance and marginally higher gain and directivity than the JHV):

I've built a new power divider for all four Yagi's, peaking the gain through field strength tests by adjusting the phases of the RF feeding the Yagi's. Changing the direction that the entire array is pointed requires moving four separate rotators. Due to the wide spacing between the Yagi's, the gain is high while the azimuth pattern is a bit unusual:

  With the unusual separation of my 6M Yagis, phasing them properly
  hasn't been easy. My mentioned peaking field strength readings via
  phase adjustment was intially done in steps, making specific changes.
  To make this process easier I've constructed three phase adjustment
  circuits for receive level signals. One of those is shown at the right.
  It can provide 0 - 262 of phase delay. When a larger delay is required
  I add a transformer wired for 180 phase inversion to the coax line.
  The circuit uses a Mini-Circuits JSPHS-51+ IC to make the phase
  changes. See: JSPHS-51+.pdf   After I know what's proper for
  receive level signals I construct a circuit for transmit power. To hear
  how this circuit works, the local N0LL/B beacon reception was nulled
  via the JSPHS-51+ with just two Yagis used. Adding 180 delay to
  the second Yagi provides near optimum reception. To hear switching
  that 180 in and out go to N0LL/B.mp3 N0LL/B is mostly via multi-path
  when nulled via the JSPHS-51+.
  

    
  
  This is a picture of my new RF power divider control
  head and HF/6M amplfier. The power divider also
  allows switching from 0 degree phasing between
  all four 6M Yagi's for maximum gain or adding 180
  degrees phase delay on two for elevation null fill
  and higher elevation lobes. Due to my unusual Yagi
  placement, it's also needed for different Yagi phases
  being required at different azimuths. A third Yagi can
  also have its RF delayed 0, 90 or 180 degrees.
  Just two Yagi's can also be fed with the other two
  being connected to a different output from my RF
  amplifier for switching between two different pairs
  of Yagi's pointed in different directions. The switches
  control RF relays which are located in another
  enclosure.
  
  
  

BV2DQ had a good signal on 6M on 17 June 2013 at 0049 GMT. To hear how he sounded hit: BV2DQ.mp3
Since he didn't send his call after sending me the report, I included a recording of his call while I was using a different filter.
To read Ran's report on the QSO see: The Magic Band on 6M - BV2DQ

During the June 2011 ARRL VHF Contest the 120 degree phasing option on two Yagi's surprisingly brought stations in the 2, 3 and 8 call areas from at, or just below the noise level to 10 - 20 dB above the noise on Sunday morning and afternoon. The number of QSO's per hour during that time period were:

    1500 - 1559z     107 Q's
    1600 - 1659z     142 Q's
    1700 - 1759z      80 Q's
    1800 - 1859z     126 Q's
    1900 - 1959z     126 Q's
    2000 - 2059z     101 Q's
    2100 - 2159z     37 Q's   (I had lunch during that hour)
    2200 - 2259z     102 Q's
The number of QSO's per grid during the entire contest were:
Please click on the picture above to see a full size image of it
You'll have to see the full size version to make much sense of my QSO's per U.S. Call Area per Half Hour Charts:
Please click on the picture above to see a full size image of it

The July 2011 CQ VHF Contest had an opening to K2's, 3's and Virginia similar to that mentioned above where my reception was better with 120 degree phasing of two Yagi's rather than the typical 0 degree. I thought that I'd document a bit of that. The following recording has 120 degree phasing during most of the QSO. However, for a short period of time while the other station is sending the report, I switch to 0 degree phasing between the two Yagi's. The decreases in amplitude in the station's audio is caused by that change. CQ VHF Test 2011.mp3
      2010 was an excellent year for 6M Es propagation to Japan.
      I had a total of 196 JA QSO's.
      The number of QSO's per grid are shown to the right:
      For a short version of what it sounded like after one QSO,
      listen to: JA PileUp.mp3
      It was not unusual to have that many JA callers. A weak
      signal was generally not the reason that it took me a
      couple of transmissions to copy some complete calls. Other
      signals required repeats due to excessive fading. One
      example of this was JF6TAC's signal from his PM43 location
      near Sasebo, Nagasaki, Japan: JF6TAC.mp3

                 JF6TAC's QSL
      To review JE1BMJ's expanation of a possible propagation
      mode between Japan and Nebraska see: SSSP
      KH6/K6MIO & W3ZZ explored 6M propagation modes
      in a report at a Central States VHF Society Conference
      using my 2010 JA QSO's for part of their analysis.
      This can be viewed at: Extreme Range 50 MHz Es.pdf
      Other similar reports are at: 6M Propagation


  
How much power is required to work Japan from Nebraska on 6 meters via Es+ propagation during the summer? I thought that I could gauge that using the 6M QSL's that I've already received from some of the Japanese stations that I worked this summer (2010). I compiled a list of the equipment shown on their cards. Using that information I calculated the approximate effective radiated power (ERP) which they used. As a reference, I included their distance away from me in kilometers. Also listed is the number of 6M QSO's made with each station since 2007. I added one contact not made this year--the furthest JA that I've worked. That was my 6M contact with JR6SVW on 7 July 2009*.

K0HA - JAPAN 2010 6M QSO's
     Call      Distance ERP # Q's      Call      Distance ERP # Q's      Call      Distance ERP # Q's
  Kilometers Watts     Kilometers Watts     Kilometers Watts  
JL3MCM's Signal 10,092 810 1 JI1RAK's Signal 9,735 3,245 1 JA7QVI's Signal 9,442 12,275 11
JA1BWD's Signal 9,700 890 2 JF2MBF's Signal 9,912 3,560 1 JA1OVD's Signal 9,680 16,300 1
JA8BP 8,974 890 1 JA1PVI 9,687 3,560 2 JH6VXP's Signal 10,345 16,300 2
JA6TEW's Signal 10,365 930 2 JA8CJY's Signal 8,990 4,480 1 JA3EMU's Signal 10,015 17,800 2
*JR6SVW 11,244 1,120 1 JF2TAR 9,896 4,910 1 JF3DRI's Signal 10,026 17,800 1
JG2NLN's Signal 9,931 1,120 1 JA1DIC's Signal 9,565 5,600 1 JN1NDY's Signal 9,736 17,800 8
JK6MXY 10,532 1,120 1 JH6CDI's Signal 10,491 5,600 1 JN4MMO's Signal 10,079 17,800 1
JH8SIT's Signal 8,988 1,230 1 JF6TAC's Signal 10,485     5,600     1 JE2OVG's Signal 9,904 22,400 1
JJ3JHP's Signal 9,965 1,230 1 JA0EOK 9,806 6,080 1 JG2AJK's Signal 9,904 22,400 4
JO3DDD's Signal 9,976 1,230 2 JH0BBE 9,612 6,150 3 JH3QNH's Signal 10,001 22,400 2
JA6WFM's Signal 10,480 1,630 1 JH0INP's Signal 9,683 6,150 5 JI2EVL's Signal 9,923 22,400 1
JH7XRZ 9,273 1,630 2 JA9SSB's Signal 9,792 6,320 2 JL8GFB's Signal 8,969 22,400 6
JF2IWW's Signal 9,968 1,780 2 JE6AZU 10,546 8,150 3 JA6GCE's Signal 10,474 24,550 1
JH8NBJ's Signal 8,974 1,780 1 JA3FYC's Signal 9,964 8,900 6 JO7HAM's Signal 9,554 24,550 1
JI1LET's Signal 9,686 1,780 1 JF2VNV's Signal 9,883 8,900 2 JF1LXO's Signal 9,679 24,550 3
JE1CUS's Signal 9,764 2,240 5 JA3JTG's Signal 10,0005 9,310 2 JH4ADV's Signal 10,131 25,120 2
JA6QGG's Signal 10,419 2,455 2 JK1AFI's Signal 9,660 9,310 7 JA9SJI 9,759 36,310 2
JH2GZY's Signal 9,882      2,460      3 JA7WSZ 9,469 9,750 5 JA4DLP's Signal 10,126 37,240 3
JO3QDQ's Signal 10,028 2,460 1 JA3RQ 10,055 11,200 2 JA1RJU's Signal 9,647    49,000    5
JH4IUO's Signal 10,220 3,160 2 JA9LSZ's Signal 9,862 11,200 2 JR6EXN's Signal 10,424    49,000    3

It looks like 1,000 watts ERP minimum is required to be ready for more than a rare opening. Plus, running 6,000 and above sure helps. But, when things are right, a much smaller station is adequate. I've copied the JA6YBR/B beacon 10,509 km away from me. It's running about 50 - 100 watts ERP.
My station produces an ERP of 10,840 watts. I think that my signal is further aided by more ground reflection gain than many others experience. Besides the above stations, many additional Japanese stations were worked this summer on 6M that I don't have QSL's from or enough information to calculate their ERP.
To hear any station's signal in a box above, just left click on their call. While not all stations were recorded, many more than those above were also recorded.

  
While also a good summer into Europe on 6M in 2010, it wasn't quite as good as last year. Among those worked this summer was LZ2CC:

  
Late on August 18, 2009 the Canary Islands were still good copy in Nebraska EN10. To hear how EA8AK and EA8CQS sounded around 2240z hit: EA8AK & EA8CQS.mp3

  

          There was another excellent 6M opening to
          Japan on late August 8 / early August 9, 2009.
          I made some late in the season 10,000+ km
          QSO's. To hear one with JH4IUO in PM64
          hit: JH4IUO.mp3

  

               Here are some of the 6M QSLs from Japan
               received already for summer 2009 QSOs:

                 
                             
                 

2009 JA QSLs
Please click on the picture above to see a full size image of it

  

  July 11/12, 2009 has replaced July 30, 2008 as having the best
  6M opening to Japan. The map to the right shows the JA grids
  worked on 6M late on July 11 / early July 12, 2009.

  I worked JA0RUG at the start of the opening. After our QSO
  Toshi started recording me. Magically that's when I began
  recording as well. My next QSO was with JH0HZO, also in
  Toshi's PM97 grid. So, I had audio from nearly both sides
  of that QSO. I combined the recordings to include my copy of
  JH0HZO along with JA0RUG's copy of me working JH0HZO.
  To hear that QSO hit: JH0HZO-K0HA.mp3

  JA0MVW later called me at different times with different
  power levels and antennas (he used his club call JA0YUD for
  one report). Having recorded all of his transmissions, I
  combined parts of each transmission in the order of our QSO's:

    2336z JA0MVW 600w to 2 x 8 ele @ 20M
    2347z JA0YUD 100w to 5 ele @ 6M
    2356z JA0MVW 10w to 2 x 8 ele @ 20M

  To hear that audio hit: JA0MVW.mp3

  

             The map shows the JA grids worked on 6M
             late on July 6 / early July 7, 2009
             To hear what JE6AZU, JL3IQE, JA4DLP, and
             JA3APL sounded like then press - JA.mp3
             Each of the recorded JA's are about 10,000 km
             or further away from my EN10 location.

       

  

       For more information on 6M go to: More 6M

  

.mp3 Recordings
JA6TEW JF2HEV
SV1DH CU8F
OX3LX IK5MEJ
SM7BAE 5T5SN
OX3OX VP2E
VP5/K7BV OX3VHF/B
VE8BY/B 7Q7SIX
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