Hooyah
Cleared hot for Reddish Knob in the NRQZ. Four Thousand Four Hundred Feet of
FM Nirvana where the squelch is zero, the noise is zero, the take off angle is
zero, the blockage is zero for 360 degrees and the EM & EN grids are line of
sight. September is going to be KATG, Kick Azz Take Grids.
More to follow.
73
John
KM4KMU
Sent from AOL Mobile Mail
From: Paulette Woody <pwoody@nrao.edu>
Date: Thursday, August 9, 2018
Subject: RE: Requested Information from John Young KM4KMU for September VHF UHF
Contest. - NRQZ ID 11549
To: nosigma <nosigma@aol.com>
John,
The following have been approved.
11549 Reddish Knob 52
11549 Reddish Knob 146
11549 Reddish Knob 223
11549 Reddish Knob 446
11549 Flagpole Knob 52
11549 Flagpole Knob 146
11549 Flagpole Knob 223
11549 Flagpole Knob 446
Paulette
From: Paulette Woody
Sent: Tuesday, July 31, 2018 11:33 AM
To: 'nosigma@aol.com' <nosigma@aol.com>
Subject: RE: Requested Information from John Young KM4KMU for September VHF UHF
Contest. - NRQZ ID 11549
John,
Thanks for the additional information.
I will be back in touch soon.
Paulette
From: nosigma@aol.com <nosigma@aol.com>
Sent: Sunday, July 29, 2018 8:52 AM
To: Paulette Woody <pwoody@nrao.edu>
Subject: Requested Information from John Young KM4KMU for September VHF UHF
Contest.
Paulette,
I hope the attached power point slides (beam widths and operating bearings)
along with the frequency and band width information below is what you were
looking for. Let me know if I missed something.
Antenna Height & Beam Tilt Angle
The booms of the Yagi antenna's are 23 feet above ground level. The booms are
angled upwards approximately 3 degrees. I find that I get flatter take off
angle by getting as close to a sharp drop off as possible to avoid knife edge
diffraction (scatters energy downwards) from local terrain. A slight upward
angle also seems to help with propagation over near by ridge lines. The last
picture in the attachment shows the system set up on Reddish Knob from last
year when Sugar Grove didnt respond before the contest.
Frequencies & Band Width
Amateur Radio FM band width is 16KHz.
Frequency ranges (in MHz) to be used
6M: 52.525 center frequency. Covering 52.517 to 52.533
2M Primary: 146.520 center frequency. Covering 146.512 to 146.528
2M Secondary: 146.535 center frequency. Covering 146.527 to 146.543
1.25M: 223.500 center frequency. Covering 223.492 to 223.508
70cm: 446.000 center frequency. Covering 445.992 to 446.008
Beam Patterns
The attached power point shows the beam patterns for 3 of the 4 antenna's.
Source of beam pattern plot is provided. M2 did not have a pattern for the
440-18 70cm antenna and I could not find one modeled on the web. I could spend
a day modeling it up on ENZEC4 but its the same exact design as the M2 222-10EZ
and should have close to the same side and back lobe patterns as teh 10-EZ
just lower levels as is the main beam gain.
Maps of Beam Pointing During Contest
Two maps are provided. The first is a detail showing Reddish Knob. It has an
overlay of the 30 and 60 degree beam widths centered on Sugar Grove. The
second map shows Reddish Knob, Flagpole Knob, Sugar Grove and Green Bank
Observatory along with the beam pattern overlays AND all contacts made from
either Reddish Knob or Flagpole Knob. Note that only 5 of the 200+ contacts
are inside the 60 degree beam width overlay centered on Sugar Grove. The same
60 degree overlay centered on Green Bank has only 3 contacts in it.
I spend very little time with the antenna's pointed towards either Green Bank
or Sugar Grove. The 8 stations that lie inside a 60 degree cone over both
sites are all scheduled contacts. They are so hard to reach due to terrain
that we arrange a time in advance to make a contest exchange (Grid Squares and
Call Signs, not a rag chew). In other words I dont sit on those bearings
calling CQ. Its not productive when I could be working up and down the
Shenandoah Valley along I-81 where there is a much bigger population or up into
eastern PA, DC and Philly.
If there is any additional information I can provide I will be happy to do so.
73
John Young
KM4KMU
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