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Showing posts from July, 2017

1296.500 MHz JT65 and FT8 test

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Today  digimode  JT65 and FT8   was tested at 23cm for first time here
with Ole OZ2OE and Thorben OZ3ZW

Signals strong but fast  QSB and Airplane scatter on top.
FT8 seems to handle the fluttery signals best
almost 100%  decoding in FT8 mode  while JT65 had some not decoded frames.

                                                     JT65

RF_AMP 45W EBAY

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Very well designed, high quality PCB all parts neatly packed. With the correct diagram relative easy to build. The newest PCB is June 2016 documentation pictures shown at Ebay are outdated  incredible  value for money 14$ Although could not yet test with RF  due too high bias Q2 0.6A - 0.7A even with shorted B-E  0.6A flowing Considering the very low prize  the supplied 2SC1971 might be a fake Mitsubishi does not longer produce this or replacements TO220 medium power RF transistors?  If someone could give a hint which eBay  2SC1971 good quality original Misubishi   is a working one That would be much appreciated 
I doubt that it will perform real good at 28MHz with the IRF530 in the final But if it comes even close to the stated specs below it would be great
3.500MHz  54W 7.050MHz  56W 10.000MHz 57W 14.270MHz 55W 21.400MHz 41W 24.000MHz 37W 28.100MHz 25W 29.600MHz 20W
Not yet found the  correct  PCB parts layout  of  latest PCB version 2016 06 21 Using the actual diagram it will not present d…

JT65

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several JA decoded this morning in JT65    signals too weak for FT8


WSJT-X V1.8 first tests

Sunday AURORA 70MHz  recording GM4ZUK/P
http://www.qsl.net/pa0oos/2017/GM4ZUK_4MAU.mp3

Installed the latest WSJT-X V.1.8.rc1 beta version

on a W7 32b DELL D420 notebook

It crashed few seconds  after start  several times  need to force stop with p.m.

After rebooting PC it was ok with CAT to the K3

In between i started V1.6 again
Frequency settings of  V1.6  where lost and needed reset to default.
these setting are removed by V1.8  and vice versa.

Then i had the first FT8 mode contacts  LX1JX groundwave dial 50.313
only ground wave with some MS enhanced scatter are possible in the present propagation dip.

The frequency dial settings are depending to the selected  region  ,  1 2 3 or all
They are different to   version 1.6        WSPR 50.293  JT65 50.276
Set to Region1  was  USB 50.310 as default JT65 not 276
in the band selection list box there are 3 6m entries when  regions "all"  is selected
the first is the usual 50.276
80m WSPR no spots freq. must be modified 3.592600  it …

IC706 classic repair

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IC706 classic  was damaged by high RF at 144 input I use this old but very good rig as 146-148  i.f for 1296MHz  XVTR Receiving Graves at 143.050  pings and scatter i forgot to disconnect the VHF antenna   ( 3 band 6,4,2) when transmitting at 6m with the 7 el just underneath so it became very quiet at 23 / 144.. 144-148 /VHF input circuit part with 3-PIN antenna switch  and MA862 band switch that switches between 2 input filters. TOP = 60-200 MHz  down is 144-148 bandpass preselection in front of the    uPC1658G  wide band preamp


MA862  bandswitch fried by high 50MHz signal at 144 /VHF input SO239

replaced by 2 BA891 bandswitch diodes Ebay 


above temporary jumper to select 144-148 band pass filter without the bandswitch diodes the IC706 does not switch to the VHF filter when tuning outside the 144-148 range  a solution without bandswitch But the burned out  MA862 protected the IC706 preamp against further serious damage So it is better to have  bandswitch diodes placed there 4 pole t…

50MHz wijd open typisch ná het weekeind

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very good 6m opening Monday 3 Juli 2017

many DX heard sorry not all heard DX resulted in 2-way because of  JT65 slow QSO rate
Briefly  check of CW part but no promising sounding signals.

wsjt log to search your decode

( 6m)  dx rules:
1 best DX is not during weekend's
2 good openings never repeat next day

Als vanouds ná weekend  op maandag ochtend 6M band  open  voor DX Japan Korea China
in het weekend was het dacht ik niet veel soeps.

Antenne moet toch wel echt op QTF 030 voor JA
Korea 3 stations  veel JA   China 2 stations , de 1e keer dat ik hier zelf China op het scherm zie.
Nu lukte het met BA4SI   al vaak super zacht in CW gehoord  nu met JT65  wel.

Heel vroeg open 07 UTC al eerder deze week heel vroeg rond 05 UTC  diverse USA gezien
raar tijdstip voor USA  beste was Alabama en KC0  in EM25   ander  pad moeten zijn
lange pad kan toch niet vanuit noord Nederland?


Druk met 23cm  reparatie alweer vocht in de voeding boven.
Corrosie  door water indringing bij een vorige lekka…