It seems to be related to FIR Filter from PlutoSDR options:
It will work only for bandwidth under 2Mhz.
Try to set RX filter to 10% and zoom out to see full bandwidth. You will see that only about some signal will pass (middle).
Probably TX works similar and might be important for spurious emissions or DATV.
At least, this is what I could figure it out. I hope I'm not wrong.
73,
Petronel
YO8SEP
How do you setup so it log the correct band (13cm) and set Freq_rx to 10GHz?
Wsjtx/JTDX log QSO in adif format with 3cm band and no RX split data because sdr console and pluto doesn't provide VFO B with 2.4GHz info.
My Pluto with SDR console and WSJT-X is working ok, displaying the RX frequency 10.489.540.000Hz.
But the generated adif log from WSJT-X has band:3cm and it should be 13cm and RX on 3cm.
Is there a way to setup WSJT-X or Log4OM to create the proper adif file ?
73,
YO8SEP
Today I made my very first QSOs (FT8) on QO-100 with a temporary setup, almost portable.
Adalm-Pluto (0,5ppm TXCO and metal case) + CN0417 (20db) + 3 turns Helix + 60-65cm Offset in a portable setup.
SDR Console with beacon lock for RX.
I will try Poty soon and hope to move everything to final location.
Next week I might try to activate "KN14".
THANK YOU all for QSOs
vy 73,
YO8SEP
Petronel
I will remove the Quartz and the 2 capacitors. Remove solder from one of the F connector and add 25Mhz. Can you give me more details about the ferrite bead transformer ?
73 Petronel
YO8SEP
This weekend I got an 60cm offset and a LNB and did some RX tests.
As expected, the temperature drift makes it unusable for digital modes. This LNB uses RDA3567 and has 2 outputs, so it will be possible to mod it to add an external reference. One other option is to replace the 25MHz quartz with a TCXO.
73 Petronel
YO8SEP
Hi,
I'm YO8SEP and I've started building my setup for QO-100.
I've started this thread to keep track of my progress and problems I encounter.
It will be based on Adalm Pluto with 0.5ppm TXCO + CN0417 driver + attenuator + (later) SG Lab 20w PA feeding a Poty or Helix (depending on local materials).
Antenna will be a 90cm offset + LNB PLL (txco or sdr-console locked) + BiasT. I might add later a 740Mhz band pass filter and/or attenuator if needed.
vy 73,
YO8SEP
Petronel
I equipped my rev.C. pluto with a similar, more simple circuit.
OS commands for switching between external and internal clock work only if the rev. resistor is modified accordingly.
Can you give more details about your circuit ?
Thank you.
73,
YO8SEP
Looking at ADALM-PLUTO details, I can't find if external CLK_IN should be sine or square-wave.
iu4gav what TCXO are you using ?
Sorry for resurrecting an old thread.
I'm new to QO-100 and I've just ordered an Adalm Pluto. I plan to replace the TXCO with TG2520SMN 40.0000M-ECGNNM3.
This will be enough for digital modes FT8/FT4 ?
Because this TXCO doesn't have an E/D pin, I will loose the option to switch to external reference using CLK_IN u.fl connector.
Is there any option (cheaper than using a LeoBodnar GPSDO) for a 40Mhz ref in ? I have a 10Mhz OCXO and I can try to get 40 or 50MHz, but phase noise is what worries me.
vy 73,
Petronel
YO8SEP
