Portable masts-reply
KT6V at aol.com
KT6V at aol.com
Sat Sep 30 12:40:03 EDT 1995
Tnx to the many for your responses. Several requested that I post the
results; I will do that after checking everything out. Tnx to LL and RP for
two very original ideas. 73 Tom
>From Ed Gilbert <eyg at hpnjlc.njd.hp.com> Sat Sep 30 17:22:29 1995
From: Ed Gilbert <eyg at hpnjlc.njd.hp.com> (Ed Gilbert)
Date: Sat, 30 Sep 1995 12:22:29 -0400
Subject: Shooting Tower Guy Points
Message-ID: <199509301618.AA126867926 at hp.com>
> I was musing about how one goes about getting the guy points at the exact right
> angle. The Rohn book shows a tolerance of plus/minus 0.1 degree in this matter.
> That's not a lot of room for error.
How bad does it get if you're off by more than 0.1 degree? The
worst case guy wire tension occurs when the wind comes from a
direction that bisects the angle between 2 guys. Take the case
of the 100' tower from the Rohn catalog. The top set of guys
bracket at the 95' level and the anchors are 80' from the tower
base. Let's say that the horizontal force at the guy bracket due
to wind loading on antennas and tower is 1000 lbs (at 80 mph this
is a 39 square foot load). If the guy points are sited at
perfect 120 degree angles, the tension in each of the two guy
wires sharing the load, including the 400 pounds of static
tension that Rohn recommends, is
1000 sqrt(95^2 + 80^2) 1
tension = ------- x ------------------ x --- + 400
cos(60) 80 2
= 1952 lbs
Now let's say you're WAY off siting one of your anchors and you
end up with 130 degrees between 2 of the guys (instead of 120).
The guy tension in this case is
1000 sqrt(95^2 + 80^2) 1
tension = ------- x ------------------ x --- + 400
cos(65) 80 2
= 2237 lbs
I'm not saying you should ignore a 15 percent increase in guy
wire tension, but asking for 0.1 degrees tolerance on the guy
anchor siting doesn't look reasonable to me.
-- Ed WA2SRQ
>From Charles Epps <epps at netcom.com> Sat Sep 30 18:35:38 1995
From: Charles Epps <epps at netcom.com> (Charles Epps)
Date: Sat, 30 Sep 1995 10:35:38 -0700 (PDT)
Subject: WRTC-96 Press Release #4
Message-ID: <Pine.3.89.9509301040.A5541-0100000 at netcom5>
WRTC-96 PRESS RELEASE #4
Redwood City, CA
September 30, 1995
The World Radiosport Team Championship (WRTC-96) will pit up to 52
two-operator teams in a head-to-head competition in the San Francisco Bay
Area during the IARU HF World Championship the weekend of July 13-14,
1996. Forty-five teams are allocated to 27 Invited Countries, one team
to the defending champions from WRTC-90, and six teams to Wild-card
entries which may come from any country. Entrants are responsible for
their own transportation to San Francisco where the WRTC-96 Committee
will provide them housing, meals, local transportation and access to
station locations.
The WRTC-96 organizers seek team members who have won recent major
contests and who are capable of competing on both CW and SSB at the level
of the very best contesters in the world. The selection process begins
with the naming of Team Leaders, who then choose their own Partners.
Each national Team Leader will select a Partner from the same country and
Wild-card Team Leaders will select from the same continent.
The Invited Countries have been allocated a number of teams determined by
the number of logs submitted from those countries in recent international
contests. The actual selection of teams in each country will be managed
in that country by contest clubs, contest managers or other respected
individuals in the contest community. For example, based upon ranking
and point totals in major contests, the WRTC-96 organizers invited ten
USA contest clubs to select the ten USA Team Leaders. Wild-card teams
will be chosen later from among direct applicants to the WRTC Team
Selection Committee.
TEAM ALLOCATIONS BY COUNTRY
Bob Cox, K3EST, Chairman of the WRTC-96 Technical Committee, described
the method used to allocate teams to the Invited Countries. "The number
of teams a country may have is based upon the number of logs submitted
from each country for the 1993 and 1994 CQWW and ARRL SSB and CW
contests. Using the number of log submissions gives an indication of the
'seriousness' of a country's commitment to contesting. Based upon the
available number of operating sites we expect to have, the WRTC-96
Technical Committee required at least 50 log submissions for a country to
qualify for a team. We limited the maximum number of teams that any
country can have to ten."
SELECTION OF TEAMS
Each team will consist of a Team Leader and a Partner. The selection
process begins with the naming of the Team Leaders who then choose their
own Partners. Each national Team Leader will select a Partner from the
same country. To emphasize that these are national teams, not part of an
interclub competition, and to extend the opportunity to compete to
contesters who are not members of the selecting clubs, the WRTC-96
organizers will require that USA Team Leaders not choose Partners from
the same contest club.
Individuals wishing to compete in WRTC-96 should make their interest and
qualifications known to those who have been invited to select the Team
Leaders for each country. In the order of total log submittals, these are:
Country Teams Selected by
United States 10 Frankford Radio Club (1 team)
Mad River Radio Club (1)
North Coast Contesters (1)
North Texas Contest Club (1)
Northern California Contest Club (1)
Potomac Valley Radio Club (1)
Society of Midwest Contesters (1)
Southeastern DX Club (1)
Southern California Contest Club (1)
Yankee Clipper Contest Club (1)
Japan 4 WRTC-96 Team Selection Committee
Germany 2 Rhein-Ruhr DX Association (1)
Bavarian Contest Club (1)
Spain 2 Spanish CQ Magazine c/o EA1AK
Italy 2 ARI c/o I2UIY (all I prefixes)
Poland 2 SP DX Club
Russia 2 SRR c/o UA3DPX (Europe and Asia)
Canada 2 Radio Amateurs of Canada c/o VE2ZP
Ukraine 1 Ukrainian Contest Club
Sweden 1 SSA c/o SM3CER
Czech Republic 1 CRK c/o OK2FD
Finland 1 OH2MM
United Kingdom 1 RSGB c/o G4BUO (all G prefixes)
France 1 - pending -
Argentina 1 Grupo Argentina CW
Brazil 1 PY5EG
Norway 1 NRRL HF Contest Manager c/o LA5QK
Slovenia 1 Slovenian Contest Club
Netherlands 1 - pending -
Denmark 1 Danish DX Group
Lithuania 1 LRD c/o LY2IJ
Slovak Republic 1 OM Contest Manager c/o OM8AB
Yugoslavia 1 SRJ c/o YU1RL
Australia 1 WRTC-96 Team Selection Committee
Belgium 1 UBA c/o ON4UN
Hungary 1 Hungarian DX Club
Bulgaria 1 LZ1JY
Subtotal 45
Returning champs 1
Wild-card teams 6
Total teams 52
The WRTC-96 Team Selection Committee will issue a supplemental press
release announcing the selecting entities for France and The Netherlands
as soon as arrangements for those countries are finalized.
According to K3EST, "We first tried to find one or more national contest
clubs in each country to name its Team Leaders. In some cases we
identified an individual instead, generally the IARU society's HF Contest
Manager or some other respected individual in the contest community.
We're looking for team members who have won major contests at the world,
continent, country or zone level. They will be up against many of the
best contesters in the world and should be capable of competing on both
CW and SSB at that level."
WILD CARD TEAMS
Wild-card teams provide an opportunity for contesters who are not
residents of Invited Countries, and for residents of Invited Countries
who are not otherwise selected, to participate in WRTC-96. Applications
for the Wild-card Team Leader positions, along with a statement of the
applicant's qualifications, must be sent directly to the WRTC-96 Team
Selection Committee. Wild-card Team Leaders will select Partners from
the same continent. The Wild-card selection process will begin after the
national selection process is completed.
DEADLINES
Contesters interested in participating in WRTC-96 have the opportunity to
be selected as a national Team Leader or Partner or as a Wild-card Team
Leader or Partner.
For Invited Country teams, the WRTC-96 Team Selection Committee should be
notified of the selection of each Team Leader by December 15, 1995,
including name, call sign, mailing address, e-mail address (if available)
and telephone number. Each Team Leader must notify the WRTC-96 Team
Selection Committee of the selected Partner's name and other information
by January 15, 1996. If team information is not submitted by these
deadlines, the country may lose the allocation which then would revert to
the Wild-card pool.
Wild-card team applications must be sent directly to the WRTC-96 Team
Selection Committee and be received by February 1, 1996. Wild-card Team
Leaders will be named by February 15, 1996 and all applicants will be
notified. Each Wild-card Team Leader must notify the WRTC-96 Team
Selection Committee of the identity of the Wild-card Partner by March 1,
1996.
The mailing address for the WRTC-96 Team Selection Committee is P. O. Box
1, Los Altos, CA 94023-0001, USA, or via e-mail to wrtc at maspar.com.
For additional information about WRTC-96, contact Rusty Epps, W6OAT at
651 Handley Trail, Redwood City, CA 94062, USA or via e-mail at
epps at netcom.com.
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