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All Asia * RUS RTTY * FD

The problems I had with N1MM  and the Prolific USB-serial on my W7  Laptop suddenly seem to have cured themselves ???
I did try again N1MM on the Lenovo W7 Laptop  + USB-serial Prolific to see how long it would run without problems this time.
But strange  all was working normal  200 RTTY QSO's in the RUSIAN Radio RTTY  went okay.
And  Al Asian and  Field day  no problems.
I did not change anything in the meantime  but it worked okay! before it would always start to loose the connection with the K3 with wild  frequencies on the logging screen.

Only I had a few times when switching from 1 log to another  in N1MM  an error pop-up message about not finding the database and switching to the ham.mdb came.
Then it crashed all screens disappear like if N1MM was closed. But you can not restart N1MM because a message comes:  "N1MM is already running"  No visible instances on the taskbar however. Only the task-manager shows that N1MM is still in memory.  After manual killing CWIF and N1MM  logger  a restart is possible the database was found again healthy no data lost...

I could make my Trust headset RFI free by placing a 22nF C over the electret element.
I had tried with ferrite clamps with poor result, sometimes  okay but sometimes feedback rumble.
Now I wanted to work AA-dx SSB on 15m with the K3 100W but that was not possible to much feedback
I tried an other PC headset  same RFI problem.  An  old hand microphone was clean. So the problem was located in the Headset itself.  Then the simple 22nF did the job. The ferrite clamps could be removed they have a marginal effect if you can not wind at least 4 or 5 times over the core.

Also I am using a logitech MK250 wireless keyboard/mouse  that one is ham proven. So far no problems with wild running mouse cursors or  R-K pop up menu's everywhere on the screen when TX-ing...

Now I must not forget to move all screens back to the Laptop screen before disconnecting the 2nd Monitor because then the program screens will be lost in cyberspace....
An annoying Video/windows  problem when using 2 screens.


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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