[OK, here is the post I composed earlier today and then decided not to
prolong this sad thread.]
My interpretation of Joe's advice is for RTTY operators to be aware of
likely operation of other digital modes in well-specified portions of the
digital sub-bands. At a glance, we RTTY ops may not notice the presence of
some other digital signals, especially in the heat of the contest when our
brains are over-loaded with RTTY diddles.
Operationally, the safest thing to do is simply avoid these small, known
areas. If there is no other place to operate on the band, then we need to
take the time to carefully discern if there is on-going operation in those
areas before assuming the bandwidth is clear and then claiming it
temporarily for our RTTY transmissions.
Why not just avoid those frequencies for RTTY contesting as a first-level
approach? Seems like common sense for sharing frequencies. Even if these
areas are not in use, potential users will complain anyway. Or,
self-appointed frequency police will complain even if they have no intention
of operating there at the time. Many of the complainers are confused about
FCC/other country regs, band plans, centers of activity, etc. I recommend
only using these areas for RTTY as a last resort and then only after taking
the time to be very certain they are not already in use. But, be prepared
for a hassle.
Ed W0YK
____________________________________________________________________________
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Joe Subich,
W4TV
Sent: Monday, January 05, 2015 11:43
To: ardnaras@gmail.com; RTTY
Subject: Re: [RTTY] Lids running RTTY on the JT65 Frequency
> If a RTTY user is on a frequency you want to use > then QSY or wait
until its clear
It isn't a matter of JT65/JT9 operators waiting on the RTTY op - just the
other way around. The RTTY operators *DO NOT LISTEN* for the other modes -
which have a 48 second transmit/72 second receive cycle. The RTTY
contesters fire up *on top of* existing QSOs - typically during the 72
second time when one station is listening for the other.
RTTY contest participants need to be taught about the characteristics of
other data signals and avoid those narrow centers of activity rather than
simply hit F1 on any frequency that shows no activity in the last 100
milliseconds.
73,
... Joe, W4TV
On 2015-01-05 10:27 AM, Liam liam wrote:
> hi The bands are shared
> If a RTTY user is on a frequency you want to use then QSY or wait
> until its clear,,,during CW or PSK tests contesters operate well
> into the
> frequencys normal used by RTTY ops Most RTTY ops understand
> and either give away a few points in the test mode or QSY to a WARC
> band
>
> Liam
>
>
> On Mon, Jan 5, 2015 at 3:05 PM, Joe Subich, W4TV <lists@subich.com> wrote:
>
>>
>>> Like it or not, the bands are shared usually based on bandwidth of
>>> the signal (depending on your country).
>>
>> While that is true, IARU recognize the "center of activity" concept.
>> The JT65/JT9 "center of activity" is x.076-x.080 *and that does not*
>> *change* just because there is a RTTY contest - any more than the
>> PACTOR autobots leave 14.095-14.0995/14.1005-14.115 and PSK31/63
>> abandons xx.070-xx.074 for the duration of the contest.
>>
>> RTTY contesters need to learn if the dial reads less than xx.0805
>> they are causing *intentional QRM* to other modes and find another
>> frequency or band. I was frankly disgusted by the number of *big
>> guns* who should know better coming up on top of existing TJT9 and JT65
QSOs all weekend.
>>
>> It is time that RTTY contest sponsors make a strong effort to educate
>> their participants about other digital activity below xx.080 (between
>> xx.070 and xx.080) particularly on 20 and 15 meters.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 2015-01-05 9:34 AM, Michael Walker wrote:
>>
>>> Like it or not, the bands are shared usually based on bandwidth of
>>> the signal (depending on your country). If you want channelized
>>> operation you may have to look elsewhere--just not ham radio.
>>>
>>> Be very happy we have this flexibility.
>>>
>>> Mike va3mw
>>>
>>>
>>> On Sat, Jan 3, 2015 at 9:04 PM, Lynn W. Taylor, WB6UUT <
>>> KX3@coldrockshotbrooms.com> wrote:
>>>
>>> I'm just guessing, but didn't someone on the list say there was an
>>> RTTY
>>>> contest?
>>>>
>>>> Isn't it fairly common for contesters to get a bit "enthusiastic"
>>>> and overlook things, especially when the op is a contester, and not
>>>> necessarily on RTTY at any other time?
>>>>
>>>>
>>>> On 1/3/2015 5:39 PM, Harry Yingst via Elecraft wrote:
>>>>
>>>> What up with all the Lids running JT-65 right over the top of
>>>> existing
>>>>> JT65 QSO's
>>>>> Haven't they ever head of Listen before you transmit?
>>>>> Better Yet have they heard of a Band Plan?
>>>>>
>>>>>
>> _______________________________________________
>> RTTY mailing list
>> RTTY@contesting.com
>> http://lists.contesting.com/mailman/listinfo/rtty
>>
>
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|