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Tropo of 11/12/13 September 2017




The general situation :

1-AIS RX  
FR-ais-3 days-coverage-during openning zs-station954-Durban-ais-3 dyas coverage

FR-AIS-distance FR-AIS-1 year coverage


AIS  best qrb was some 2500kms or so.



2-The Hepburn predictions 

With my own maps to compare.





3-The troposphere profile

Unfortunatly, no data from station 68592-FALE-King-Shaka
61980 FMEE Saint-Denis Observations at 12Z 11 Sep 2017 61980 FMEE Saint-Denis Observations at 12Z 12 Sep 2017 61980 FMEE Saint-Denis Observations at 12Z 13 Sep 2017
68842 FAPE Port Elizabeth Observations at 12Z 11 Sep 2017 68842 FAPE Port Elizabeth Observations at 12Z 12 Sep 2017 68842 FAPE Port Elizabeth Observations at 12Z 13 Sep 2017



4-The surface pressure charts
 
They can be found here


5-The visible or IR maps - NRL






6-The airmass pictures "copyright (2011) EUMETSAT"

For analysis of airmass maps see : http://oiswww.eumetsat.org/IPPS/html/bin/guides/msg_rgb_airmass.ppt

Just for pleasure : EUMETSAT_MSG_RGBNatColour_SouthernAfrica-2017-09-13-11z.jpg


7-The reports and some comments

11/09/2017 : ZS5HV JT -19  ; ZS5LEE JT -21
12/09/2017 : ZS5DJ ssb 57/57 (morning) ; ZSHV JT -5 and 57/57 ssb
13/09/2017 : ZS5DJ ssb 44/43 (morning)

After that conditions dropped and band was closed.


8-Equipment at FR5DN :

On 2m:
In "beacon mode", 70-80w out into 17el F9FT-13dbd yagi at 6.5m above ground.
Old PC dedicated to the 2m station for digital modes and AIS receiver (modified FT-2500M).
For qso, i can use up to 120w out max in shack
Mast mounted LNA with BF981 feed through coax, no measurement on NF.
Coax is a  low loss rigid coax  LCF12-50, with some ecoflex 10.
I use separate TX and RX lines, which make things much more flexible, RX line is standard RG-213.
RX is Kenwood R-5000.
TRX for beacon and qso is dedicated Kenwood TR-9000.


On 70cms:

I run a now 4x21 el yagi at 2,5m above ground (lowest antennas)
Low loss coax, mixed length of hardline 7/8 and some length of lcf12-50 and LCF14-50.
Power 40w in-shack, higher if needed.
Mast mounted LNA 33db gain, 0.3db NF. Loss before LNA is around 0,9db.
RX is separated rx : LT70s converter with FT-990, 28Mhz IF.


The antennas used for the qsos:





Tks to All, and see you next opening !

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