DL1GNM On a similar dish i receive the PSK beacon with abt 25db over TP noise, on your picture i estimate you have abt 20db there. So there is room for improvements.
73 de DB8TF
Posts by DB8TF
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Has somebody already modified/tested this Amp on 2,4GHz?
vy73 DB8TF
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Another unusual 150ks Transmission this time from DJ4ZZ
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Yes they do.
But if you use the SW drift correction then no problem at all.
There are also RTL-SDRs with 0,5ppm TCXOs available for a few bucks.
73 DB8TF
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The HD Line BP2 was the worst wobbling LNB i ever had in my hands.
Total trash.
Link > Receiving system not based on Octagon LNB
Maybe the wobbling on this LNB is caused by using only one xtal for 2 mixer/PLL ICs?
vy73 DB8TF
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oe7dbh : could it be possible to remove the "weak" output BPF on the older models (like mine here) to increase output power?
After my final PA i use a good interdigital filter so maybe this BPF is not needed anymore?
vy73 DB8TF
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BTW kann man einen LNB auch mit Einkabellösung an eine externe Referenz (GPSDO/TCXO/OCXO) im Shack anbinden:
Link > Pollin LNB GM201
Geht auch mit anderen LNBs, hier ist z.B. ein "alter" Octagon OTSLO über eine Leitung an einen TCXO im Shack angebunden.
Durch die (hoffentlich) deutlich stabilere Temperatur im Shack ist die resultierende Drift deutlich kleiner als mit TCXO im LNB.
Vy73 DB8TF
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@MarKro: just playing around with the settings to get better decoding
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Just received a rather seldom Transmission with unusual SR 166ks and H.265 from PE2JKO.
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SWL-Oliver : Ich wünsche viel Erfolg beim erlangen der Lizenz, sonst bräuchtest du ja keinen Upconverter
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here is a mod on another LNB with a similar RDA IC (with ES suffix)
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Well, a Picture says more than 1000 words
It's a RDA3565S PLL/Mixer IC inside.
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da der auch einen 27MHz Quarz enthält wird der Umbau ähnlich dem alten Octagon OTSLO sein. Der Quarz ist auf der Unterseite der PCB. Diese lässt sich jedoch nach dem Ablöten der F-Buchsen leicht herausnehmen um die beiden Leiterbahnen vom Quarz auf der Oberseite zu finden. Bei interesse kann ich hier morgen mal den LNB öffnen, Bilder machen und den vermutlichen Anschlusspunkt beschreiben.
VY73 DB8TF
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IU2KAC :
click on the faint line in the waterfall to center the signal.
increase loop gain to about 2 and decrease loop damping to ca 0.002
also short disable and enabling of the carrier recovery checkbox could help
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@Markro: working good but one Thing is still annoying (not on every Signal!):
If i tune to some Signals (with carrier recovery enabled) i can't get the 4-Dot constellation, only the "ring".
After disabling and enabling the carrier recovery instantly the correct IQ constellation appears.
And maybe the brightness of the waterfall could be adjusted separately from the BB gain ?
Here the Decoding is best when the Signal is dark blue and because of that barely visible.
Keep up the good work
VY73 DB8TF
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Wenn ich mir die PCB (Bild) anschaue dann vermute ich dort den TFF1015 Mischer/PLL zu erkennen.
Mit diesen TFF Typen hatte ich immer Wobbeln. Dafür lassen die sich sehr weit ziehen in der LO.
Mein Tip: Opticum AX Black Buster Twin
Spielt neben den "alten" Octagons hier am besten
Gruß DB8TF
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@IK1HGI: I don't think we are talking about the same thing.
I mean a scanning function which looks on predefined frequencies on the WBTP with the "usual" SRs and if a signal is found then automatic lock an decoding it.
Looks like:
tune to 10.4955 and look if there is a signal with 1Ms if yes > decode
if no> tune to 10.49475 and look if there is a sig with 500Ks if yes > decode
if no> tune to 10.49525 and look if there is a sig with 500Ks if yes > decode
and so on...
Maybe i got you wrong but lets wait what MarKro says.
73s DB8TF
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@SWL-MarKro:
Maybe another nice feature would be a programmable scan function?
So you can set some frequencies (maybe in a .cfg file) with SR and your SW could scan this frequencies and if it finds a Signal within a defined time (maybe 5sec) then it locks to it and VLC starts playing.
Just a idea..
73s DB8TF
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Try 9.749,95MHz downconverter freq and zoom out the lower window.
You have zoomed in to about 4kHz, which is way to less.
Also important is that you set the double Digit on the GHz Position > 99GHz in Settings
and then adjust your rx freq up to 10.489,675MHz.
Normally then you should see the PSK beacon in the lower window.
Vy73 DB8TF
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Just repaired my "small" Andrew MRF21045 PA which quits working after the first few minutes on QO100 on 12.02.19
A broken SMD resistor on the gate was the cause of the failure.
Now its a little bit improved by 1dB and delivers about 15W when excited with the 500mW from the BU500.
VY73s DB8TF
