Bill,
As Peter has responded, there are two JA windows; 1810-1825 and
1907.7-1912.5 .
Until a few years ago the JA hams only had the upper 1907.7-1912.5
allocation. Because the band was segmented in much of the world most
international contacts on 160 Meters were done split frequency.
From here in the USA the common method was for US stations to transmit in
the 1.820-1.830 area where their narrow band TX antennas were resonant and
listen for the JA stations in the above 1.9 MHZ JA allocation. The JA
stations would do the opposite, TXing above 1.9 and listening down low.
The method of contacting each other was not random. When you CQed, you
added at the end the couple of digits that indicated where you were
listening in the other fellows band. For example, I would CQ CQ de N5IA
N5IA r83. What this meant to the JA stations that I was listening on
1.908.3. We did this both for casual DXing and in the contests.
Since the new, wider allocation to JA at the 1.810 to 1.825, to my knowledge
all contest contacts are done simplex in that portion of the spectrum. If
you want to work JA on 160 Meters you have to be within that window also.
I don't know for a fact, but I suppose the above 1.9 MHZ allocation is
probably used by JA for local, in country contacts. Anyone out there know
how that portion of the spectrum is now used in JA?
I hope this helps you and perhaps others, Bill.
73 and good evening de Milt, N5IA
-----Original Message-----
From: Bill Cromwell
Sent: Wednesday, December 05, 2012 1:21 PM
To: Milt -- N5IA
Cc: Bill and Liz ; topband@contesting.com
Subject: Re: Topband: DX WINDOW
On Wed, 2012-12-05 at 11:47 -0700, Milt -- N5IA wrote:
All JA stations worked called me on my Run frequencies within the 'JA
Window'.
CU all in the SPDC.
73 de Milt, N5IA, op at N7GP
The JA window?
73,
Bill KU8H
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