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

Having relative poor signals on the local 70cm / 2m channels using this X50 Diamond collinear 70/2  1m 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. My antenna uses SO239 connector UHF type semi air spaced isolator.  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 n...
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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 adjuste...
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WSJT-x multiple instance

I am testing with 2 instances  WSJT-x  latest version. Using N3IZN notes on gougle.groups.com/forum/#topic/2-meter-wspr/oONMxyALMTO This is simple using  2 shortcuts to WSJT-X   with  command line  option --rig-name=xxxx This command line option creates separate program environments with different configurations. 2 (or more)  rigs can be used simultane with WSJT-x  at the same PC A second instance of WSJT-x  for the 2nd Rig  and the logging is needed \ The shortcuts to WSJT-x  have to be modified to accomplish this. to add a second separate working instance for WSJT-x make a copy of the first shortcut to WSJT-x rename the shortcut to rig2       rig2  is the name you want to use for your rig r-click on this WSJT-x rig2 open properties change the target name to C:\WSJT\wsjtx\bin\wsjtx.exe --rig-name=rig2 ( 1 space between wsjtx.exe. and --rig-name=rig2    and rig-namem m...
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