Skip to main content

Hello 28MHz a bit recovered

listening  3512kHz  for ZK2C  nothing heard this morning
Might have been the last chance  this  FB expedition  ends 17-2-2012
Bad luck all the earth magnetic disturbances   since the good 80M copy of VP6T  it has not got good again.

heard very clear 539/549 signal  ZL3NB  working G's  at 3505
 RX loop direction  S-W  long path
On the TX antenna hardly detected in the noise

WSPR 28 this morning

2012-02-16 10:04  PA0O  28.126166  -17  0  JO33hg  1  VK3XPT  QF22nd  16426  78


2012-02-16 09:12  PA0O  28.126178  -1  0  JO33hg  1  A45WT  LL93  5462  106 
 2012-02-16 09:24  PA0O  28.126176  -20  0  JO33hg  1  UA9XSS  LP63tn  2885  48 
 2012-02-16 08:18  UA9XSS  28.126085  -25  2  LP63tn  10  PA0O  JO33hg  2885  269 

Some improvements to the 70MHz   BLF177  done  now  "easy 150 out in the dummy load"
Had to replace  the middle LP coil section with a longer one  that helped a lot.
The unwanted feedback at 28MHz seems to be fixed also.
Also the used brown 500V silver mica Sprague  C  have some loss at these frequency   replaced one by
an ARCO 462


Comments

Post a Comment

Archive

Show more

Popular posts from this blog

70MHz IARU contest 19 20 Juli

 26 QSO in CW USB. Op zaterdag wat zwakke signalen uit Engeland, in de avond haast geen signalen meer. Dit was geen FT8 dat was duidelijk...  Op 70MHz is men in Engeland heel actief , voor een grote contest zoals deze IARU R1 24uur zoekt men daar goede locaties op zoals hier M0ICK/P IO84SA ik had QSO nr 4 Michael al 41! . Maar ook op de activity avonden op de Dinsdag avonden van de de maand zijn veel Engelse stations actief . Zo kon ik op de 2e dinsdag  van juni op 1 avond in een paar uur tijd 100QSO's op 70cm 432 MHz in CW USB hoofdzakelijk G's maar ook SM7 6 OZ SP OK DL   zoek  voor de agenda op : https://vhf-uhf.veron.nl/contesten/contestrobot/       Pas op Zondag later in de ochtend ging de band open eerst 9H1PA  daarna vrijwel heel Spanje ,het geduld werd beloond.  gemiddelde  haast 1200km  Ook EA op 70.200 in FM , helaas wel te dicht op USB waardoor een QSO haast niet mogelijk was.   4M station de IC7100 me...
Post a Comment
Read more

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...
8 comments
Read more

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...
11 comments
Read more