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28Mhz today

 Call signWorkedDate/TimeBandModeFreqQSL
DetailsPA0OEA4HGR2020-05-16 10:38:0010MFT828.07512SPAIN
DetailsPA0OR9JAC2020-05-16 10:33:0010MFT828.07512 
DetailsPA0OR1AV2020-05-16 10:29:3010MFT828.07512EUROPEAN RUSSIA
DetailsPA0OBH4QYX2020-05-16 10:27:3010MFT828.07512CHINA
DetailsPA0OBG5EEF2020-05-16 10:21:0010MFT828.07512CHINA
DetailsPA0OEA5WP2020-05-16 10:17:0010MFT828.07512 
DetailsPA0OR1AP2020-05-16 10:15:0010MFT828.07512 
DetailsPA0OJH3QMF2020-05-16 10:12:0010MFT828.07641JAPAN
DetailsPA0OPA2DX2020-05-16 08:17:0010MFT828.07474 
DetailsPA0ORA1AMX2020-05-16 08:12:3010MFT828.07474 
DetailsPA0OR2AW2020-05-16 07:58:1510MFT828.07474 
DetailsPA0OOH7AWS2020-05-16 07:55:1510MFT828.07474FINLAND
DetailsPA0OUA9CQV2020-05-16 07:53:1510MFT828.07474 
DetailsPA0ORX9WN2020-05-16 07:52:1510MFT828.07474 
DetailsPA0ORA9J2020-05-16 07:46:4510MFT828.07474 
DetailsPA0OPA0AER2020-05-16 07:39:4510MFT828.07474 
DetailsPA0OR9HAK2020-05-16 07:38:4510MFT828.07474 
DetailsPA0ORA1AMX2020-05-16 07:36:1510MFT828.07474 
DetailsPA0OOG2A2020-05-16 07:31:4510MFT828.07515 
DetailsPA0OBD7BS2020-05-16 07:22:4510MFT828.07638CHINA
DetailsPA0OF5HNQ2020-05-06 08:44:4512MFT824.91573FRANCE
DetailsPA0OSP6EFY2020-05-06 08:36:3017MFT818.10073POLAND
DetailsPA0OSK0TM2020-05-06 08:34:3017MFT818.10073 
DetailsPA0ORC9YD2020-05-06 08:28:3017MFT818.10073 
DetailsPA0O4J75P2020-05-06 08:16:3017MFT818.10073 


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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