[CQ-Contest] IARU log checking report
jimsmith at shaw.ca
Thu Jun 10 00:49:56 PDT 2010
I have a solution to this which I think makes sense technically but
which may never get off the ground politically.
Call them IARU zones instead of ITU zones.
This specifically makes IARU the arbiter of zone boundaries for ham
purposes and makes any reference to ITU documents irrelevant.
73, Jim Smith VE7FO
On 6/6/2010 3:30 PM, Michael Keane, K1MK wrote:
> Yeah, this topic aperiodically resurfaces as it is confusing. Bottom
> line is what we refer to as ITU zones in amateur radio, are not the
> official ITU HFBC CIRAF zones.
> The history behind this is that the official ITU zones (formally the ITU
> HFBC CIRAF zones) as found in the ITU Radio Regulations and the FCC
> Rules, are a set of zones originally defined at the 1947/1948 ITU HF
> Broadcasting Conference held in Mexico City. These zones are used in
> defining reception target areas for scheduling and frequency
> coordination in the HF Broadcasting (HFBC) service. They are known as
> CIRAF zones because CIRAF is the acronym for Conferencia Internacional
> de Radiodifusión por Altas Frecuencias... Spanish for International
> Conference on HF Broadcasting.
> The zones specified at that Mexico City conference are a set of
> latitude/longitude vertices which are connected by rhumb lines i.e.,
> straight lines on a Mercator projection. The boundaries of these CIRAF
> zones do not follow any national borders (except by serendipity). That
> makes sense given that the purpose for defining these zones was to
> create a coarse grid for calculating HF coverage plots using propagation
> prediction programs of the day, the predecessors of what evolved to
> become VOACAP, etc.
> AFAIK, the amateur radio version of ITU zones came about when someone
> grafted the ITU HFBC CIRAF zones onto an amateur radio context. (Anyone
> know who first did this and when? Was it the IARU? Was it the Radio
> Amateur Callbook?) In the process of doing that, a number of changes
> were made. The biggest changes being that the amateur radio version of
> ITU zones have boundaries that are in many cases coincident with
> national, political borders, but certainly not in all cases.
> The IARU Region 1 HF Managers Handbook contains in its Chapter 10.10 a
> table entitled "ITU Zones, when used in the amateur service". That is
> probably the best way to think of these zones as they have relatively
> little in common with the official ITU definitions except the name.
> The amateur radio modified set of the "ITU zone" definitions shown in
> the R1 HF Managers Handbook, the ARRL Opearting Manual and elsewhere has
> been what's been used in the IARU HF Championship and the preceding IARU
> Radiosport Championship since the first running of the latter contest in
> Given that it's quite easy to confuse "ITU zones" (ITU HFBC CIRAF zones)
> with "ITU Zones" (ITU Zones as adapted for use by amateur radio
> operators in contests) one can expect this topic to resurface again in
> the future :-)
> Mike K1MK
> On 6/5/2010 9:46 PM, David Gilbert wrote:
>> It appears that EI8IC waded through that swamp several years ago, with
>> the general conclusion that ITU zones for ham radio purposes are
>> whatever the contest sponsor says they are.
>> Dave AB7E
>> On 6/5/2010 3:22 PM, Doug Grant wrote:
>>> I got curious, and went to the ITU site to confirm Joe's statement
>>> that part of Wisconsin is in Zone 7 instead of 8.
>>> The Official ITU CIRAF Zone map can be found here:
>>> He's right.
>>> A quick look shows that the boundaries do not fall cleanly on
>>> call-area, state or even national borders. There are lots of
>>> part-of-Wisconsin-in-Zone-7-not-8 boundary cases. Half of Belize is in
>>> Zone 10, half in 11. Part of Maine (I think W5WMU/1's QTH is in that
>>> part) is in Zone 9 (generally all Zone 9s are assumed to be Canada).
>>> Parts of Washington State are in Zone 2. The U.S.-Mexico border
>>> wanders back and forth across the line, so some U.S. guys are really
>>> in Zone 10, and some XEs are in zone 7.
>>> In fact, the resolution of the official map is not particularly great,
>>> so it may be tough for a lot of people to figure out what zone they
>>> are really in.
>>> Seems to me that the ITU CIRAF zones were drawn with straight lines in
>>> an attempt to as closely as possible match assorted political
>>> boundaries. The intent was probably to match them exactly, but there's
>>> no obvious record I could find on the ITU site that said that. I found
>>> a text document that defines the (I think) the corners and centers of
>>> various quadrants within each zone for the purposes of monitoring
>>> signal strength of HF broadcast stations here:
>>> Kind of a drag that country/state boundaries don't fall cleanly on
>>> latitude/longitude lines, eh?
>>> So you can give out whatever zone you can reasonably assume the ITU
>>> wants you in...as long as you send the same zone the whole contest.
>>> And good luck to the log checkers!
>>> Doug K1DG
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