maybe something to review here, It wouldn't show the constellation window for some strange reason
Turned out a volume mixer issue, still the performance under W7 is nothing compared to hsmodem running under W10, the 5 files and the html were transferred successfully on W10 but not on W7.
Works on Win7 here, so should work on your pc too.
maybe something to review here, It wouldn't show the constellation window for some strange reason
Display MoreHi Ernst,
Go to "SETUP", select the audio device carrying RX audio (VAC in your case).
Bring the volume up to about the level shown in the picture below.
Tune your rx to make the signal fill the "Tuning Window", with the leftmost peak centered in the "Ref" column. The circle should show a constellation like in the picture.
Go to "File", wait for the button " Open received HTML file" to show up. Click on it and have your browser display incomming data.
73, Martin
On windows 7 this will not work, that was my other problem 
Display MoreHi Ernst,
Go to "SETUP", select the audio device carrying RX audio (VAC in your case).
Bring the volume up to about the level shown in the picture below.
Tune your rx to make the signal fill the "Tuning Window", with the leftmost peak centered in the "Ref" column. The circle should show a constellation like in the picture.
Go to "File", wait for the button " Open received HTML file" to show up. Click on it and have your browser display incomming data.
73, Martin
Will try it, thanks
Display More
Modem sees a VAC signal, but what next, RX sync stays orange. Instructions are a bit cryptic.
Some observations:
--... ...-- . .-. -. ... -
Display More<DISCLAIMER> My knowledge about FT-8 is very limited. I once was a member of a small team operating as TO5M from FP, Saint Pierre & Miquelon. My teammates showed me which button to push now and then to keep the program going. So i sat there for a few hours and watched the contacts coming in , filling the logbook. I haven't worked FT-8 from home (not beyond a few test-qso's). <DISCLAIMER>
While i agree with Ernst, PA1EJO, for the most part of his mentioned article, i disagree that FT-8 is a low power mode. If you need the extra 10dB to make a contact on shortwave, why not crank up the power to a kilowatt? Just set everything right to put out a clean signal, or - at least - try do do so. On satellite, you usually have a dish to add the missing dBs to your signal.
No, it is a LOW SIGNAL Mode.
Now that i said that, i really don't understand why most of the FT-8 signals i can see on the satellite are beacon level or even above. There is no real reason for that. Correct me if i'm wrong.
I suspect many FT-8 users on QO-100 just can not monitor their signal because they can not receive while they transmit. They will never know they triggered Leila, because their transmit cycle is longer than the warning signal coming from Leila. Even if they hear or see Leila, most people on QO-100 think "some 1D10T triggered Leila, but not me". <polemic on>This also applies to many SSBers.<polemic off>
Flamesuit on.
73, Martin
There is spectral density, dB/Hz, and this is with low power a high number because of the bandwidth of the FSK signal. Price to pay is that you need time to convey the message.
I just wrote this on FT8 on QO100: https://pa1ejo.wordpress.com/2…/working-in-ft8-on-qo100/
PA1EJO, we (PE1GLX and me) liked your 12 to 24v converter, and we just bought this as well. Our transverters are finished, no space left, so we will use it as an outside box.
Kijk anders even op mijn website of de Electron van Nov 2021, suc6
Display MoreAt 13V I measure around 5.5 Watt CW output.
I do not know how accurate my meter is.
Has anyone tested the sglabs PA at 12/14/16/18/20/22/24/26/28 volt?
Thanks, Henk
You can take it to 28 Volt, I run it at 24 Volt.
Noticed that the frequency offset (the -70 Hz) has shifted upward by about 20 to 30 Hz. The early morning PSK beacon goes now to positive a few Hz, it used to be 30 Hz negative. Is this deliberate, is there any information?
Did a test last night with the Leila system, what I think is that the warning system is triggered by narrow banded signals in the SSB 2700 Hz window. Narrow banded in this context means that Leila performs the power measurement over a much narrower part in the window than the 2700 Hz (or so) that we use for SSB.
The consequence is that you can transmit with the same power, but that a poor equalization of the transmitted power will trigger Leila. Too much bass or treble and Leila goes off, Equalize the same power and Leila stays silent. Whistle in the microphone and Leila becomes active. Insert a CW tone with the same transmit power and Leila is triggered again.
I fully understand that we should stay at acceptable power levels but in the current implementation Leila is more of a power density monitor than a power meter. Power metering should consider what we use for SSB in my opinion. Otherwise you are penalizing users for poor modulation rather than excessive transmit power. What did the makers of the Leila system want to achieve? Where is the pass-band aspect in your power measurement? What does it mean, stay below the level of the beacon, in an acceptable SSB band or in a different band, what width are we talking about? Or did you also want to warn users that they are splattering?
Please don't start the full duplex discussion again, yes I do that myself in both my permanent and my portable setup. We see Leila and act and this is how you find out how we believe Leila works.
PA1EJO The satellite LEILA beacons are injected from AMSAT-DL HQ in Bochum.
This confirms my suspicion because of the factor 0.814 that I mention in the blog. I get the best match between my own Doppler frequency offset measurements and the PSK beacon frequency offsets when I apply the 0.814 to both the PSK beacon measurement and my own Doppler measurement. In other words, the PSK and beacon signals must go through the same 2.4 GHz uplink in the same way as I do the roundtrip measurement. My last point is, why not apply the approx -70 Hz offset on the ground so that you only get to see the Doppler from the satellite?
This is why I make my own ground stations where I insert a signal splitter and a isolator in the receive line, the second signal of the splitter goes into a SDR and SDRconsole on a laptop, the first signal of the splitter goes to the transceiver
This thread is ancient, but nevertheless: You can monitor frequencies of the satellite oscillator yourself with a round trip measurement experiment. I found this: https://pa1ejo.wordpress.com/2…00-satellite-transponder/ My verdict is : -63.7 Hz bias for the satellite oscillator and -6 Hz for relativity. The rest of the frequency offsets correspond the Doppler effect due to satellite orbit dynamics and some maneuvering which you get from the TLEs. The satellite beacon is according to me an injected signal from Doha in Qatar, and I think there is a reason to keep the total Doppler and oscillator effect negative, so that you can't have a confusion on the sign of the correction.
I just completed a new grounstation with the SGlab amplifier and their upconverter, works like a champ in my opinion, see also: https://pa1ejo.wordpress.com/2…ble-set-up-for-oscar-100/
Display MoreHi,
UG570 says:
The AD9361 Rx and Tx RFPLLs use the DCXO or external clock as their reference clock as well. For this reason, it is extremely critical that the crystal or clock source have very low phase noise. The recommended phase noise specification is shown in Figure 2.
73 Detlev
When you specify phase noise, at what offset frequency do you want the -90dBc/Hz?
If you add more beacon SNR data and locally observed relative humidity then the relation becomes more clear. Two pictures from an updated article on my blog. https://pa1ejo.wordpress.com/2…3/beacon-signal-strength/
Hi together,
last days we had extreem rain about 40lit in 1 hour. No TV-Rx with 80m dish from Astra. The upper beacon from qo100 falls down about 7dB.
73 Wilhelm dl6dca
Wow! We can get a lot of rain in the Netherlands but 40mm in one hour is really exceptional.
Spotted the first rain cell anomaly when a weather front passed over my station. Conclusion is that the signal normally varies by +/- 0.5 dB which seems related to relative humidity, and that during severe rain (you need pouring rain of several mm per hour) results in 1,5 dB signal loss.
