[Elecraft] K3_JT65_Digi mode

[Ken Roberson]

Lance,

Thanks , that was a very good Expiation .
We have many times on 6M ssb and 2M eme,
However we have not worked 6M EME , after
I rework my 6M antenna ill look for you
on 6M eme .
73 CUL Ken K5DNL
---------------------------------------------


--- On Wed, 1/14/09, Lance Collister <w7gj at q.com> wrote:

> From: Lance Collister <w7gj at q.com>
> Subject: Re: [Elecraft] K3_JT65_Digi mode
> To: kwroberson at yahoo.com
> Cc: elecraft at mailman.qth.net
> Date: Wednesday, January 14, 2009, 10:18 AM
> Ken Roberson wrote:
> > Hello All,
> > 
> > The K3 has been working flawless on digi modes.
> > About 2 years ago we started using JT65 on HF,
> > It the same that we use for EME weak signal
> moon-bounce .
> > With low power and a dipole we are able to work
> > EU almost every day.
> > Before I built the K3 I was using a homebrew 4 watt
> rig .
> > JT65a is part of the WSJT software package, It's
> free software.
> > The call freq on 20 Meters is 14076, we operate + or -
> abt 600 hz from 14076.
> > Check it out , In the day time u can hear the tones of
> JT65A on 14076.
> > In the morning EU is coming in and in the afternoon -
> evening JA and VK Land .
> > http://physics.princeton.edu/pulsar/K1JT/index.htm
> > 73 all good dx Ken K5DNL
> > 
> > 
> > 
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> > 
> Good point, Ken!
> 
> Since most of the folks here are K3 users (with built-in
> digital mode capability on 6m) I will add this to Ken's
> comments... I have worked stations as small as 100w using 5
> element yagis on 6m EME using the very sensitive JT65A mode.
>  There was no signal audible from such small stations, but
> the message sequences were successfully decoded and the
> signal trace is very easily observed on the SpecJT waterfall
> screen while JT65A mode is running.
> 
> And I'll bet you had heard the 6m band was dead!  The
> secret to working 6m EME with JT65A is:
> 
> 1) Set up a schedule with a large 6m station and run the
> schedule for the hour that the moon is closest to the
> horizon at your QTH, so it will pass through the ground gain
> antenna lobes that provide the extra gain when your antenna
> is aimed at the horizon.
> 
> 2) Choose a good time of month when conditions for 6m EME
> are optimum (there are good and bad days every month,
> depending on where the moon is in its orbit around the
> earth).
> 
> 3) Transmit and monitor EVERY minute of the schedule. 
> Signal peaks on 6m EME can be very short, and everything
> must be exactly right for you to decode the very weak EME
> signals.  For example, two of the factors are that the
> polarity of the signals continually rotates, and the setting
> (or rising) moon must happen to be passing through one of
> your antenna's narrow but high gain ground gain lobes.
> 
> 4) On top of everything else, it is very rare for both
> stations to copy each other at the same time (due to the
> polarity changes), so the standard EME exchanges and
> protocol need to be followed.  These messages are
> automatically generated by the user in JT65A mode, and the
> procedure is explained there (press F5 when running JT65A
> mode).
> 
> If anyone is interested in learning more about JT65A mode
> or 6m EME, more information is available on my website:
> 
> http://www.bigskyspaces.com/w7gj/Welcome_to_6m_EME.htm
> http://www.bigskyspaces.com/w7gj/JT65.txt
> 
> Gud luck and DX to all!  VY 73, Lance
> 
> -- Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN,
> WA1JXN/C6A, ZF2OC/ZF8)
> P.O. Box 73
> Frenchtown, MT  59834  USA
> QTH: DN27UB
> TEL: (406) 626-5728   URL: http://www.bigskyspaces.com/w7gj
> 2m DXCC #11, 6m DXCC #815