[Moon] 4U1ITU 28/09/2018

[charlie at sucklingfamily.free-online.co.uk]

Hi Zdenek

Thanks for the QSO last night.  It was good that we were able to test with
lower spreading than was the case later in the evening.

A few stations seemed to want to try JT4 when QRA64 would have been
better.  Page 10 of the linked article by Rex and I has a graph to assist
in choosing which mode to use. The crossover between QRA64D and JT4F is
about 170-180Hz.  Below that QRA64D is preferred.  Sometimes even a little
above the crossover QRA64D may be better as it is much more immune to
false decodes that JT4 at marginal levels.

The other point to make is that it is the value of the mutual spreading
that determines the choice (DxWid in Astro window).  Local spreading
(Width) does not matter.

One other point - while QRA64E might look attractive at higher spreading
values, our on-air experience is that it doesn't seems to work as well as
expected, but that testing has not been exhaustive.

Link:

https://drive.google.com/file/d/0B116IwQIUFNTX3YxYTllTVdDc2M/view?usp=sharing

73

Charlie




>
> Hi EME gang, last night we were QRV 24 and partly 10 GHz. Both bands were
> clear and I have finally joined silent bands, off of all QRM. On 24 GHz we
> have completed 4 QSOs with OK1KIR, G3WDG, OZ1LPR and LX1DB. QSO with LX1DB
> was amazing. So loud signal, aurora effect due to spread :-) and worked
> CW.
> Willie has seriously great setup. We did not complete QSO with JA1WQF, PA0
> BAT, DL7YC, W5LUA even all stations were perfect copy here and fully
> decoded
> in QRA64 or JT4. Problem was very high spread which during QSO with W5LUA
> reached 425 Hz (and my low portable power, but for next expedition it will
> be better :-). In this case I had tuning tone 1000 Hz from Al as fat line
> on
> the screen and of course speaker copy. Pity that I do not have bigger
> power.
> But test that 24 GHz on portable and expedition is usable was successful
> for
> me.
>
> 10 GHz was easy. I exchange TRV for 10 GHz between waiting Al W5LUA on 24
> GHz. Worked were OK1KIR very strong signal, OZ1FF, OK2AQ, OK1CA, DF1OI by
> QRA64D and F1PYR, OK1KIR, OK1CA CW easy.
>
> Thank you to all for patience and QSOs.
>
> Plan for tonight. Main interest between you was repeat 23cm. So in the
> 3,2m
> dish we will have 1296 MHz gear as second option. Main band will be 10368
> MHz  Look for us on HB9Q where we will announce changes between bands. We
> start with 10 GHz.
>
> Plan for Moon pass from 29-30.09.2018 is 2320 MHz main band and focus to
> ARRL EME MW contest
>
> Plan for Moon pass from 30-01.10.2018 is 5760 MHz main band and focus to
> ARRL EME MW contest
>
>
>
>
> Best regards from 4U1ITU and see you via Moon
>
> --Â 
> Zdenek - OK1DFC
> www.ok1dfc.com
> QRV EME 144 MHz - 10 GHz
> WAC 432 - 1296 - 2320 MHz
> WAZ #9 - WAS 432 #29
> DXCC 432 - 1296 MHz
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