What PC performance is in use?
Posts by DD4YR
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The total gain is therefore 24.86 + 10 = 34.86 dB ?
no, the gain of the dish and the helix can not be added. The gain over all is 24.8 dB.
The starting point of the windings should be in the focus of the antenna.
73 de Robert
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Hello Claudio,
the left one has the better (not correct) shape. Can be better with a rolloff 0.25, what is usual for DVB-S2.
The right one is result of a overdriven power amplifier, maybe a Class-C type. On the bottom you can see
the intermodulation, what happens, when the pa is overdriven and the distance between intermodulation and useful signal is not large enough.
A DATV PA may only be operated with at least 6 dB less than the possible CW power, the quiescent current must be designed as Class A/B.
This excample shows the Intermodulation Diagramm.
Its a 180 Watt CW-PA. You can see, on DATV is only 6dB less (abt. 45 Watt) possible.
On higher power the IM rises up..... And finaly you can see shoulders of the
signal over the TP
This is a shape with rolloff .25 and clas A/B power amplifier. IM distance is on tx side 35dB.
73 de Robert, DD4YR
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Sieht Watt32 v4.64 ähnlich:
Hier am Beispiel meiner 1,8m PF Sendeanlage:
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Sind Daten aus dem Programm .... Hab das nur so übernommen.
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Hi,
for example with QuickWatt
I´m on the save side
73 de Robert
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I have already tried with horizontal and also vertical polarization.
Did the narrowband level change if you switch to horizontal ?
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At 739,500 MHz. can see the signals of the narrow band. At 741,500 MHz. (where there is datv beacon) there is nothing.
Yes, this is ok if you do not switch from Vertikal to Horizontal polarisation ....
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Hello Rudy,
firmware v0.31 is from AnalogDevices basicly firmware for the PLUTO, not from F5OEO, Evariste. Did not support DATV on UDP
You have to add a pluto.frm from F5EOE to run DATV on UDP.
After installing start pluto.php
With this script you can adjust all the DATV settings on the PLUTO.
What hardware Version is your PLUTO ?
73 de Robert
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there is no control of the LNB power supply.
this is correct.
The MiniTiouner Express layout has no support for software control of LNB power.
The DC voltage is sourced directly from the tuner input DC power. Since the tuner itself will operate from a +8 to +24VDC source, the preamp voltage requirements dictate the tuner supply voltage.
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try ebay with "bird wattmeter slug ghz" in search ....
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Thomas, egal von welcher Richtung man aus drauf schaut, die Linksdrehung bleibt immer gleich. Wie bei einer Gewindestange, egal von welcher Richtung man drauf schaut, das Rechts oder Linksgewinde bleibt immer gleich.
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No, this is LHCP .... all ok
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Benötigt die REV C/D keine weiteren Modifikationen, wie z.B die USB Mod?
Grundsätzlich nicht.
Die USB Modifikation ist nur notwendig wenn die Masse / Erdungsverhältnisse am Aufstellort unsauber oder undefiniert sind.
Die von Analog Devices realisierte Trennung der Potentiale ist ja als Schutz für das Gerät gedacht ...
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Hi Wilhelm,
the right pic is a original pic from CT1FFU (dx patrol), not from EI2EJB !?!
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i see a serious mistake in picture #1.
I don´t think that this are mistakes.
The original from dx patrol looks like picture #1 and works.
Try first to use correct cable and connections.
73 de Robert
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First you have to check the SMA connectors. There are two types, with which you can make a failed connection
[Blocked Image: https://www.copter-forum.de/wcf/attachment/1351-sma-connector-jpg/]
And this type of connection will never, never work on 2,4 GHz ....
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What shows the SWR indicator if connected to a dummy load? All ok? (with the same cables) Maybe a SMA type fail
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