Wednesday, May 27, 2015

what happened to M(a)y Es?

We had few days with total radio blackout  only earth path decodes on 10m
But now 10m recovered a bit  with VK2KRR decodes

 weather turned back to early spring gray sky cold

some spotty ES   5Z0L  was worked today in JO33 but not by me ..
I was not at the radio at the best time when  reported iby 4X1RF  I had WSPR running
Later in evening good ES at 70MHz several CT EA7 strong   EA8 and ZB2 was reported but not heard at 4M
At 50Mhz strong EA IT9 LZ    D4C/B  at 50.034 heard 4X4SIX/B 50080
then 50.104 heard 5Z0L  cqcq strong up 1  easy worked..  but never heard such strong East Africa
a slim?  5Z0L home frequency is 50.102 up 1
Ironic to work a slim I can't work real dx it seems.
5Z0L_6.mp3 slim easy to work!
Changed  the HF/4ele 6m to HF + 5 ele 6m
2 new directors 12 and 10mm tapered elements
from left over 4/6 yagi experiments
I did not solder the 10/12mm Aluminium  but instead forced  the pieces 2-3cm in each other to make a good joint. Applying some WD40 first and heating the joint while hammering.
But that worked better  using copper-grease the WD40 triggered the smoke alert.
Without grease it is very hard to press the tubes in each other 10mm at-most but greasing and heating it 3cm is possible that's is enough for a good electrical contact and a strong joint.
Soldering can weaken the alloy Aluminium ST50 to much
So this way its easy to construct tapered elements.

Used DK7ZB 5el 6m dimensions as starting point.
Did modify  the  6m reflector to radiator distance to 142cm   the HF dipole is at  120cm from the 6m Reflector element and i wanted to place the 6m radiator in front of the HF radiator thinking that it could be not so good for the shorter element behind the HF dipole but have to test that too.
After converting to 5 ele matching was unchanged  very good almost 1:1.1
f/b   is real good at least 3 S units als as before.
The gain most important and difficult to determinate  I hope with the  3 new directors  will be improved. With the  4 ele  the 2 directors where to short 265 and 261cm
now d1=270 d2=269 d3=264

I was questioning the gain I could not decode W7GJ EME signal in 2 nights
Only once last year 1 decode seen.
Few years before with the 7 ele DK7ZB  I had  -13dB copy
Also with the 7ele LFA  and the 9ele from the pre computer age had made a 2-way with Lance


Now hoping for some improvement at 6m
The best way to find out about the "gain"  or effectiveness is to try to decode W7GJ EME signal
But also the WSPR reports of known terrestrial 6m signals give some indication

some wspr DX this morning
    
and just when writing this  LA5TFA JP99 decoded at 6! but ant to S-E...
5 ele 4m and 5 ele 6m /HF multiband


 2015-05-27 09:06  PA0O  50.294474  -18  0  JO33hg  1  4X1RF  KM72ls  3201  124 
 2015-05-27 09:42  PA0O  50.294474  -22  0  JO33hg  1  4X1RF  KM72ls  3201  124 
 2015-05-27 03:56  PA0O  50.294512  -21  0  JO33hg  1  DK8NE  JN59fw  455  143 
 2015-05-27 03:32  PA0O  50.294512  -25  0  JO33hg  1  DK8NE  JN59fw  455  143 
 2015-05-27 04:10  PA0O  50.294512  -28  -1  JO33hg  1  DK8NE  JN59fw  455  143 
 2015-05-27 03:20  PA0O  50.294512  -19  1  JO33hg  1  DK8NE  JN59fw  455  143 
 2015-05-27 03:14  DK8NE  50.294466  -13  -1  JN59fw  10  PA0O  JO33hg  455  326 
 2015-05-27 02:20  PA0O  50.294510  -18  0  JO33hg  1  DK8NE  JN59fw  455  143 
 2015-05-27 08:54  PA0O  50.294466  -19  -4  JO33hg  1  OZ7IT  JO65df  428  57 
 2015-05-27 08:30  PA0O  50.294466  -18  0  JO33hg  1  OZ7IT  JO65df  428  57 
 2015-05-27 02:20  PA0O  50.294506  -22  -3  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 04:10  PA0O  50.294508  -17  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 02:08  PA0O  50.294508  -13  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 05:46  PA0O  50.294510  -17  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 03:32  PA0O  50.294509  -19  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 12:56  PA0O  50.294507  -16  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 03:20  PA0O  50.294509  -15  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 03:56  PA0O  50.294508  -14  0  JO33hg  1  DB0ZDF  JN49cx  382  163 
 2015-05-27 12:56  PA0O  50.294469  -26  -1  JO33hg  1  DL1KAI  JO42vj  234  113 
 2015-05-27 09:40  DK1QG  50.294508  -21  0  JO43sx  10  PA0O  JO33hg  208  249 
 2015-05-27 09:42  PA0O  50.294471  -25  0  JO33hg  1  DK1QG  JO43sx  208  67 
 2015-05-27 03:56  PA0O  50.294493  +4  0  JO33hg  1  NL8992  JO32fl  89  187 

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