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 - 262º of phase delay. When a larger delay is required
I add a transformer wired for 180º 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 the proper delay
is 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
180º delay to the second Yagi provides near optimum reception.
To hear switching the 180º in and out go to N0LL/B.mp3
N0LL/B reception is mostly via multi-path when nulled via the
The lower picture to the right shows my Fluke 96B Scopemeter's
display comparing the phase shifter's output with its input with
the JSPHS-51+ set for the typical phase difference shown.
BV2DQ had a good signal on 6M on 17 June 2013 at 0049 GMT. To hear how he sounded
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:
| 2010 was an excellent year for 6M Es propagation to Japan.
I had a total of 196 JA QSO's. If you want to hear what
the openings sounded like, see my YouTube video. It has
It has almost 50 JA 6M signals recorded on it. To see
the video go to: CQ 6M JA 2010 de K0HA
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
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|
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:
I've belatedly produced a new CQ JA video. It includes recordings of 6M JA contacts made during the summer of 2009. I only chose from contacts made on either July 6-7, July 11-12 or August 8-9, 2009. I starts with a sweep of contacts through all ten of the JA call districts. To see it hit: CQ JA 2009 de K0HA
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
Here are some of the 6M QSLs from Japan
July 11/12, 2009 has replaced July 30, 2008 as having the best
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
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
|More 6M||NDB Page|
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