There is another very good reason for split operation, and I've seen
the VP6DX ops doing this successfully as well.
With, for example, the 20-, 40- and 75/80-meter allocations being
different for hams in the various parts of the world, it's not unusual
at all to see the DX station calling from whatever their particular
mode's sub-band might allow, and attempting to work ops in other parts
of the world that are restricted to a different frequency range. It's
also very common to see a DX station purposely working split from a
sub-band that is restricted to higher-class licensees just to keep
down the on-channel QRM, staying, for example, in the less-crowded
Extra CW bands.
A week ago, I worked VP6DX on 40 meters SSB late at night. The German
op was calling on 7095, which is restricted to non-voice modes in most
of the non-Pacific US, announcing he was listening on 7265, or
wherever the broadcast QRM was the lightest. Interestingly, since
traffic was quite light, he announced that he was also listening on
7087 for EU hams. He ping-pong'ed us all back and forth, taking one
from 7265, then one from 7087.
On 15 meters, VP6DX was transmitting on 21002, in the Extra portion of
the band, and listening on 21027, where non-Extras could call, etc.
73,
Dave K7DAA
http://www.k7daa.com
On Feb 22, 2008, at 2:51 PM, Richard HIll wrote:
Which brings us to The Complete DXer. OK, coming from a novice--the
sport
of breaking a pile up is listening to the DX, identifying who just got
called, finding that op's frequency, and then learning how the DX is
moving
after the contact, and being in the right place so be called next.
The pileup gets spread out by the DX moving his RX frequency after
each QSO
(keeping his TX frequency constant). You could just sit on one
frequency
and call till the DX goes home or you get lucky, or you could take
Bob's
advice and develop skills described quite well in the book.
Being a new ham and new to DXing, and having read Bob's book--it was
a real
thrill to make one call contacts in major pileups with 100 watts
from an
IC-718 and a low dipole. Even better with a K2 or K3, but I did not
know
better then (2002-3, near the top of the solar cycle)<grin>.
Also helps to understand a bit about propagation and pick your best
chances.
Rich
NU6T
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Tom Hammond
Sent: Friday, February 22, 2008 2:14 PM
To: Brett Howard; [email protected]
Subject: Re: [Elecraft] Split DX
Hi Brett:
I've heard frequencies where it seems like nothing is going on and
then all
of the sudden 10 stations light up. I'm assuming that this is a
split DX
and I'm only hearing half of it.
That's almost certainly what you're hearing... the end that the DX
station is listening to... called 'the piluep'...
But anyway it doesn't make much sense to me. So granted a station
can
listen to both frequencies at once and I'm sure transmitting
station is
probably only listening when he's not transmitting (unless he has two
separate radios and two separate antennas). This just seems like a
waste of bandwidth especially if he's not doing full duplex.
It's a matter of the DX station being able to BE HEARD once a pileup
of
callers has grown.
If the DX station is working everyone 'simplex' (e.g. on his transmit
frequency), it won't take long before many of the calling stations
start
(0r continue) calling the DX station long after he has already
picked out
a station and is attempting to complete a contact with that station.
However, due to the fact that a number of callers continue to call
ON TOP
of the DX station, no one can hear the DX station, or at least can't
hear
him well enough to complete the QSO... so everyone continues to call
and
the DX continues to try to work (or pick out) a single station from
those
calling ON HIS FREQUENCY.
If however the DX says he's listening "UP 5", "UP 10", or "Up
wherever",
he then is able to move the callers (the pileup) off of HIS transmit
frequency, so that all the callers can hear him when he responds to a
calling station. Additionally, the pileup will naturally spread out a
bit (generally around a central listening frequency) so the DX
operator
will be able to tune through the pileup, picking out individual
callers
and (generally) working them at a much faster rate.
There have been really excellent ops in the past who could 'handle' an
on-frequency pileup as swiftly as those working split, but those ops
are
few and generally far between.
The next effort for the DX operator is to not allow his pileup to
become
1) too unruly, and 2) too widely spread out such that it covers too
wide
an amount of the spectrum. Most times, a goos CW op can keep his
pileup
mostly contained within 5-7 kHz without too much difficulty. The
exception
sometimes being when it's a really rare country and there are
(literally)
several hundred, or more, callers all screaming at once.
Is there a common split distance so that one may easily find the
other
half or do people usually just go digging till they find it?
Generally "UP 5" is a very commonly used split. I believe the VP6DX
crew
is using WIDE splits in order to keep THEIR signal well out of any QRM
from callers, and to keep it from being too close to the upper band
edge
of the US extra class bands. They have been specifying splits which
allow
all classes of licensee to call them... the calling split freq being
just a few kHz above the bottom of the General Class band segment.
73,
Tom Hammond N0SS
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