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10M wide open

map shows only my spots  today from 10 UTC  not even with the SR to VK
1W Tx
West coast USA
1558 -11 -0.2  28.126107 -2 KE7A EM12 37
 1658  -4 -1.0  28.126089  0 K7UEB DN06 37
1718 -15 -0.1  28.126091  0 W6PI CM87 37
2012-09-23 17:00  PA0O  28.126129  -23  0  JO33hg  1  N6RY  DM13id  8991  315 
WA6LIE  CM96eq  8842 
20120923 0800  28010.0 CW   PA0O         539  NH7O            559                    
20120923 0808  28019.0 CW   PA0O         559  KH7Y            599 Fred               
20120923 0826  28028.1 CW   PA0O         599  VK9CS           599                    
20120923 0836  28496.0 USB  PA0O          59  TJ3AY            59                    
20120923 0846  28554.9 USB  PA0O          55  JE7JIS           59 hiro    sendai     
20120923 0854  28550.0 USB  PA0O          58  3DA0NJ           58                    
20120923 0858  28540.0 USB  PA0O          59  TA7I             59 Oskan              
20120923 0904  28511.1 USB  PA0O          59  OD5PY            59 marwan             
20120923 0916  28472.9 USB  PA0O          59  TB5ZND           59 nico    pd1dk Anamur km66mc
20120923 0936  28458.1 USB  PA0O          59  PD1DX            59 Erik    Terneuzen  
20120923 1147  28510.0 USB  PA0O          55  P29FR            57              


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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