Hi,
The obvious question is if this "mode" is permitted in QO100 and if yes if it must be any rules for it. This "mode" maybe can be very useful in an emergency where time is critical.
Hi,
The obvious question is if this "mode" is permitted in QO100 and if yes if it must be any rules for it. This "mode" maybe can be very useful in an emergency where time is critical.
Hi,
I have a proposal for a "new" operational mode for NB.
The traditional QSO using USB in all frequencies is half duplex. This is due to the fact that is impossible to Rx during Tx. Using USB is possible two stations or more to talk at the same time without interfering each other.
The proposal is that two or more stations talk together like a telephone conversation. Of course callsigns must told every few minutes according to ham radio laws.
This will provide a more "natural" mode of communication that is impossible to implement with out QO100.
Good point George, but you still have to be compliant with the regulations in your country and according to your license.
Regards
Matthias
This is mandatory.
The question is what is the added value of us as ham radio to science and society today. Are we just operators and consumers?
Hi,
A SDR based system must use the capabilities of software based solutions in order to do things that can not be done or is very complicated to do with hardware. All of us try to replicate hardware solutions into the software solutions and not think what new features can be implemented.
Hi George,
This is off topic, but you are very experienced in GNU-Radio:
Do you know of a ready to use model in GNU-Radio for testing a simple RX/TX repeater using a Pluto or LimeSDR? Could be NBFM or linear.Want to try 23cm or above.
73 Gerhard
Can you explain what exactly you want to do?
Hi,
10.000 hop per second with 150 KHz bandwidth archived.
Rename the mp3.txt to mp3.
In practice is 10.000 sweep per second!!!...
Hi Gerhard OE3GBB,
In practice what is important is the degradation in performance. I have to use as much power as I can. I use the WB transponder in the 1st section. I have noticed that degradation exists when others use the WB transponder. I continusly change flowgraphs experimenting. I must try USB modulation as it will permit me to hear the difference and not just degradate the FreeDV performance that I have now.
QO100 opened a wonderful window of experimtation in high frequencies and digital communications!!!
Hi,
Thanks DO4FB & DK2TX for QSO with portable NB station.
Hi,
Portable station just before putting into the box.
Hi,
One similar situation was caused by loosely 75 ohm connector in my case.
Hi,
10 MHz OCXO, 74HC74 dividing by 2, xtal filter selecting 5th harmonic (25 MHz), MAV11, splitter driving Pluto and one more MAV11 driving LNB.
Hi,
This syntax works :
fw_setenv ad936x_ext_refclk_override "<25000000>"
Hi,
Just another Pluto with Ethernet, Rev D now, in a more compact box.
Hi,
I have a LimeSDR USB. It is supported?
Hi,
Also is possible with IGMP Proxy.
Hi,
It was implemented finally the capability to display receiving video of a minitioune receiver to VLC and change settings via LiveTune via a WAN of Mikrotik routers using PIM.
Hi,
10.000 hop per second with 150 KHz bandwidth archived.
Rename the mp3.txt to mp3.
Hi,
Frequency hopping tests begin at WB between 10.492.750 - 10.494.750 according to previous guidelines. FreeDV 1600 is used with GNURadio. A 80 cm dish with 3 Watt and Pluto is used. The hopping is not random, is saw-tooth. The photo is from one hop per second with 300-400 KHz spread bandwidth. Maximum frequency hopping bandwidth of 500 KHz can be archived. Recovering the signal is done now manually, using variable delay. Rename the mp3.txt to mp3 to listen to it.
Hi,
Using LimeSDR-USB a 3.7 GNURadio flowchart is created for displaying MER and exact frequency.
QPSK and 1500,1000,500,333,250,125 kS are supported.
Frequency step is fixed at 250 KHz, according to band plan.
External clock for Lime is not yet supported in flowchart.
Python code is attached (you have to remove the .txt).
Hi,
For portable operation a 13.8V power bank using 4*2 surplus matched 18650 is used.
Specs:
13.8V, 3A max (limited) output.
5 hours @ 500 mA discharge time.
V&A meters @ battery.
Charging current 1.5 A (750 mA for each 18650)
Charging input voltage 4-30V.
LEDs charging indication
Anderson 30A output connector.
S4 Lithium protection unit.
Teflon cables.
Electronic 3A fuse at charging input.
Dimensions : 150*110*50 mm.
Weight : 820 gr
Update: a non plastic material, heat resistant, replace the white plastic 18650 insulation separator .