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Showing posts from January, 2020

Chinese connectors N-SMA , 23 January tropo

I wanted to test my 23cm LNA  MMC SKY67151
https://vhfdesign.com/lna/lna-23cm-sky67151.html
Like picture below but N connector version .
The older type below has a bandpass 100MHz / -3db  exellent results low noise
high gain no self oscillation no more 4G interference.
The newer type has 20MHz bandpass a HAM friend wanted my old to use it for 23 ATV
And i got a new in return
Needed   N-SMA adapters since my tiny XVTR box at the dish uses SMA type relay
The pre-amp / XVTR is direct at the dish.
I got 2 "Chinese" N-SMA with it
The measure crew at the noise figure stand told me right away you can throw this N-SMA in the bin...
But please measure first and judge then..
It was found that the suspect adapter is not bad at all
 adding about only 0.1dB to the noise figure.
That is a normal insertion loss for a connector.
A brand adapter Amphenol  offered 10€ used but gave no less noise then the suspect.
Then another brand type was found Teleg√§rtner, new the seller accepted 2€
That o…

Band hopping 630/2200m over night

Automatic hopping had result last night
At  2200m the best heard DX sofar
630m no  t.a.  decodes this night

TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz 2020-01-24 06:34  K3RWR  0.137482  -28  0  FM18qi  1  PA0O  JO33hg  6279  45  2020-01-24 05:52  K3RWR  0.137482  -27  0  FM18qi  1  F4GUK  JN18gt  6190  52  2020-01-24 05:40  K3RWR  0.137482  -29  0  FM18qi  1  ON5KQ  JO10os  6157  49  2020-01-24 02:16  K3RWR  0.137482  -27  0  FM18qi  1  ON5KQ  JO10os  6157  49  2020-01-24 08:28  K3RWR  0.137482  -28  0  FM18qi  1  LA2XPA  JP33wi  6000  34  2020-01-23 23:22  K3RWR  0.137482  -31  0  FM18qi  1  EA8BFK  IL38bo  5809  81  2020-01-24 05:16  K3RWR  0.137482  -31  0  FM18qi  1  2E0ILY  IO82  5689  49  2020-01-24 08:28  K3RWR  0.137482  -25  0  FM18qi  1  EB8ARZ/2  IL18uk  5609  82 

TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz# Spots 2020-01-23 18:12  VK3MI  3.570043  -26  0  QF22ne  5  PA0O  JO33hg  16423  312  5  2020-01-24 03:02  TI4JWC  3.570128  -24  0  EK70wb  0.5  PA0O  JO33hg…

136kHz receiving noise in WSPR window at nights

Darrin KE9NS did release  P-SDR Version 2.8.0.149  supporting the MCP23017  I/O expander.
Big thanks great job!
Automatic bandpass selecting / hopping now also works for the "XVTR" bands 2200m and 630m.
The Flex1500  needs external Bandfilters for 137 / 475 kHz  i.e. below 482kHz the bandfilter section is bypassed.
2200m and 630m are added as XVTR bands and use the  BNC port XVTX/C for external bandfilters and antenna. in TX the output is about 0dBm over the XVTX/C port
The I2C flexwire is connected to MCP23017 I2C i/o expand band switching

The MCP23017  external slave address lines: A0=A1=1(Vcc) ,  A2=0
Then 474kHz /630m band    GPIO A0=low  A1=high = 3.2V
and 136kHz /2200m band  A0=hi    A1 =low
The GPIO are active high in on state so the circuit can be kept very simple.
Only output A0 is used
To switch the small relays of my dual bandfilter only an TUN o.c. is needed
GPIO A0  active high 3.2V  4k7k at the base of o.c. TUN to select band pass filter 2200m




MCP23017 Ali Exp…

2020 with beam

overnight LF rx
TimestampCallMHzSNRDriftGridPwrReporterRGridkmaz# Spots 2020-01-06 06:58  K3MF  0.137405  -28  0  FM19sr  1  PA0O  JO33hg  6162  46  3  2020-01-05 22:32  N1BUG  0.137438  -24  0  FN55mf  1  PA0O  JO33hg  5297  52  55  2020-01-05 22:52  OE3EMC  0.137433  -26  0  JN78jo  0.001  PA0O  JO33hg  772  315  20  2020-01-05 22:40  G8HUH  0.137450  -23  0  IO81mg  0.1  PA0O  JO33hg  688  67  1  2020-01-06 05:56  F4GUK  0.137456  -27  0  JN18gt  0.2  PA0O  JO33hg  572  28  2  2020-01-05 22:20  DL7NN  0.137440  -2  0  JO60it  1  PA0O  JO33hg  498  306  45  2020-01-05 22:20  G6AVK  0.137570  -20  0  JO01ho  0.05  PA0O  JO33hg  447  63  3


NAC 28MHz ... Boreal Activity Contest

Thursday evening Nordic Activity Contest
NAC 28MHz  or should it be the Boreal Activity Contest (...)
a good test for the Steppir  on a "dead"band

several OH SM signals seen at 28074   ...  in the FT8 window  .. where else ;-)
this time i tried to start WSJT-x  from out N1MM

Normally i start WSJT-x first then N1MM and click away the CAT error popups
N1MM is running the back round
This way WSJT FT8 QSO are also logged in N1MM  general logging data
Provided N1MM   WSJT UDP  setting is checked
 a bit complicated but it works

starting WSJT-x from out N1MM  integrated WSJT-x
gave Rig  Control Error after closing N1MM   WSJT-x  now called   WSJT-x-ForEW1
 runs  i guess i have to modify the configuration to run both simultane


Need to close N1MM  to run now called WSJT-X - ForEW1
Contest mode  config  automatic logging checked
It runs in a new ForEW1 user domain so the existing WSJT is unchanged

the last hour of this test



WSJT-x crashed  when mixing up 2 QSO OH2OT and SM5EPO and PD…