[50mhz] JT44 EME Power Point Presentation by K2UYH

[Lance Collister]

Hello Rein,

Thanks for sharing this presentation with everyone!  A power point presentation
on JT44 is a great idea.  I have currently worked over 2 dozen DXCC countries on
6m using EME (almost a third of my current total country count on 6m), and most
of these contacts have only been possible because of the power of JT44!  I also
am VERY interested in seeing more single yagi 6m stations and DXpeditions around
the world try JT44 EME as an option.  

By the way, I also was fortunate enough to work the ES8X group last year on JT44
via 6m EME (the only way I can reach EU on 6m from my QTH) using their 5 element
yagi aimed on the horizon over salt water for ground gain.  JT44 on EME is also
responsible for my contact with the 6m CY9DH DXpedition last year.

I have only a few corrections/comments regarding the information presented on
the web page (and hope that they can be corrected so people visiting there will
receive the proper information):

Page 7: The proper spelling of the island is "KIHNU".

Page 10:  The word "have" should be changed to "half".  Although they do sound
similar in English, the meanings are entirely different, and non-English readers
may have difficulty making sense of this type of printed error.

Page 11:  JT44 seaches for the signals to be between -1 second and +4 seconds of
the correct UTC time - this is to allow for the time delay involved with EME
echoes.  (The slide showed +1 to -4 second period (?), which implies that JT44
signals travel faster than the speed of light!)

Page 17:  The slide indicated that JT44 requires PTT control via the parallel
(LPT1) port. The standard program provides the option of allowing transmitting
control either by VOX or via a SERIAL port.  Of course, on EME (with amplifiers,
coaxial relays and preamps), VOX control is not an option.  I would be
interested in learning of any available software to re-direct the JT44 program's
serial port commands to a laptop's parallel (LPT1) port.

Thanks again for all your effort publicizing this amazing new tool for weak
signal communications!  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/FAX: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj

"Rein A. Smit" wrote:
> 
>     Hello All,
> 
>     K2UYH has been presenting a Power Point presentation on JT44 in EME for
>     smaller EME stations in particular. ( at CSVHF and other meetings )
> 
>     Al has earned his scores and awards in EME. He has been active and promoting EME
>     for decades and is a very credible player, technically as well as a
>     radio amateur.
> 
>     It is highly significant, I believe, that someone with this record is promoting
>     JT44 as a means to increase EME activity and to bring EME QSO's within
>     a larger number of those interested in VHF/UHF weak signal work.
> 
>     As many of us experience it is harder and harder to run large stations
>     in terms of ERP. JT44 and other DSP based techniques offer possibilities
>     to negate some of these factors to a certain extent at least.
> 
>     The presentation shows even a few examples of EME in the field.
> 
>     JT44 is certainly not a method for the so-called dumb-down hams, often
>     referred to, in certain circles
> 
>     Of course we are all free to select methods and techniques according to
>     our views and resources.
> 
>     The power point file is about 2MB large and requires MS Power Point software.
> 
>     I have also extracted the individual pages for viewing without power point.
> 
>     http://www.nitehawk.com/rasmit/jt44_50.html
> 
>     At the bottom of he page are some links to detailed info on JT44.
> 
>     73 Rein W6/PA0ZN
> 
-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL/FAX: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj