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28MHz S.A. FT8

short opening just after dinner came in and saw the FT8 screen  28MHz is alive sometimes
and with FT8 this season  could be busy on 10 and 6 ...


 Other subject

My "WSPR Laptop"  Dell D420  that was running a few years 24-7  did not want to boot W7 anymore after i switched it off for a few months
The Battery was no longer detected by the system and the low battery lamp is blinking continuous.
It boots until the W7 flags start to wave  BT is activated then minutes nothing but HD flikkering  then the blue screen of death for split second and the cycle starts over again
I have no image of this system a big mistake.
With an USB bootable W7pro  version tried al possible repair actions  no result.
Chkdsk found no serious disk errors.
It is an OEM W7pro install no product key label on the PC
But the W7 Product key was found with  Produkey  prog
I thought to use this key for a new installation of W7 
But this  registration key failed  although it was registered before.

I got a bit nervous about that this can happen anytime... 
Now trying to make a recovery backup of this Laptop W7 Thinkpad i7
But the windows backup service was switched off  for unknown reason
I switched it on again for what reason would one switch this service off anyway??
But then the big struggle again with Windows backup
Instructions found on internet stopped at step 1 
click on ...  non  existing etc etc
 someone suggested Macrium software so i did ,a relief  a good and logical user interface woow!
Image is saved to a file i will use this  and forget Windows backup
 

 

 







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SPF5189z Low noise preamp 23cm

14-4-2018 updated


Above the low noise  preamp 50 - 4GHz    ebay  6€

Tested  2 small porto antennas
1 Baofeng UV antenna left   2nd best signal on PI2NOS
2 eBay DIAMONDSRH805S  wide band 144/432/1200  it works for its size as expected
3 piece of wire :   best signal in the setup...

Unit under test at workbench.
It was stable  50mA  at 5V   few days,  but sudden the current went up to 100mA
And i could  no longer adjust it with the negative bias Voltage.
The - Voltage went to zero and the SPF input port became low Z.
This SPF5189z was broken  no oscillations, no input overload just it broke while i was receiving the PI2NOS 430.125 using a small antenna at the workbench.

The specs of  SPF5189z  say it has an internal circuit  regulating the bias current.
Replaced . again   with an other of the 5 spare SPF i have.
The new one again could be adjusted at 50mA  5V 
The current raises to 150mA  when removing the  negative gate voltage.
Where is that internal bias circuit ?
I suspect  eBay …

2011-01-22 DIAMOND X30 2m 70cm 1m30 Colinear inside

Having relative poor signals on the local 70cm / 2m channels using this Diamond collinear 70/2 combi antenna at a height of 25m. I needed to investigate what could be wrong.
Measuring the cable only 3W is left for the antenna of the 10W 435MHz output from a IC451E
The cable is 30m type H100 Z50 10mm outside diameter it is semi air-spaced but has an impossible 4mm² solid CU inner conductor not much air left. I preferred the H43 Z75 cable having lower loss and mechanical better ratio in conductor size but it is no longer selling i think. This H43
3W should be enough for a comfortable noise free FM signal. But only 27km away at PA0A the signal is weak too weak something must be wrong? I made a simple reference dipole of 2x17cm CU wire.
With this dipole the signals where totally worse. So the Diamond does work?
I got curious to look inside. Maybe moisture penetration degraded the antenna.
This  antenna is rainwater close in its normal vertical mounting position. But take care if your mast can b…

Nice opening10m and 12m to S.A.

SFI  low 70 a 16 K3  still 10m opened up in afternoon to N-Italy EA5 F JN33
F/PD0OHW/M in JN33 decoded 150mW

VP8LP  12m    2-way with GP 7m ag swr 1:3


60m 5,362 open to ZL every? morning