Also so wie Markus mir sagte, werden die verbauten LSP-02G vor dem Aufbau handverlesen und auf Wobbeln geprüft.
Möglicherweise kann BaMaTech Dir ja ein Feed mit Deinem LNB anfertigen...
Also so wie Markus mir sagte, werden die verbauten LSP-02G vor dem Aufbau handverlesen und auf Wobbeln geprüft.
Möglicherweise kann BaMaTech Dir ja ein Feed mit Deinem LNB anfertigen...
Hallo Joachim,
daran bin ich leider auch gescheitert. Ich konnte nicht herausfinden, wie die Anordnung zusammen gebaut ist.
Der LNB scheint vorne abgestochen und rundum abgedreht zu sein. Keine Ahnung, ob der 2,4GHz Feed eine Passung ist, die nur durch "heiß/kalt-Montage" zusammengesteckt wurde.
Sei jedenfalls vorsichtig mit Drehen, die Gefahr ist hoch, dass Du die SMA-Buchse für den 2,4GHz Feed abreißt.
Möglicherweise müsstest Du da mal Markus von BaMaTech direkt kontaktieren...
73, Thorsten
What is the type of the camping dish ?
Tnx, Rudi - ON7CL
Question addressed to me?
A Megasat offset camping dish (35/40cm)...
@IW5BNL
Hi David,
Is it a realistic number with so small dish?
For my reception experiments I use a 35cm camping dish on a tripod on the ground, a TCXO modified OPTICUM LSP-02G and a NOOELEC RTL-SDR with a 10dB attenuator at the input.
I have the beacon peak at about 25dB over noise floor (see attachment).
73, Thorsten
Hallo Peter,
danke für den Hinweis.
Ich bin am Wochenende tatsächlich auch über diese Webseite gestolpert.
Leider habe ich keinen Zugriff mehr auf CST-Studio.
Ich muss mal "weiterforschen" und schauen, ob man mit 4NEC2 was aus einem mit dem Geometry Designer erstellten Modell machen kann.
Aber das wird ohne einen grafischen Editor wahrscheinlich ganz schön knifflig...
73, Thorsten
Hallo zusamnen,
hat hier jemand schon einmal eine Offset Parabolantenne für NEC2 modelliert?
Vielen Dank.
73, Thorsten
Finally, I am sleeping well again
Here is a guide for modifying the OPTICUM RED LSP-02G and ROBUST with a TXCO:
http://www.dl9sec.de/download/…TCXO_Modification_1V0.pdf
73, Thorsten
Gibt es das Filter noch irgendwo?
Gruß, Thorsten
Thanks for the reply
Sounds great, thank you for your efforts...
73, Thorsten
Connecting to a rtl_tcp server seems currently not possible, isn't it?
G4IUG No issue, Dave.
Just want to be sure not to blow the D4202 until i know if the TFF1015H PLL runs with that TCXO.
I couldn't find anything about a modification of that "new" LSP-02G or a TCXO modification with a TFF1015H.
DL5CN gave some hints with a similar two-chip solution and it seems to work and the D4202 can supply another 50mA. So i can go ahead with a better, less power dissipating modification as you suggested...
73, Thorsten
Ok, after finishing the modification...how to test if it was successful without climbing on a roof or buy another dish?
I discussed this with my former student colleague Jochen DG1SFJ and he told me about some 24GHz experiments and a similar problem. He found a very simple but very good idea at https://ea4eoz.blogspot.com/2012/10/24ghz-old-way.html?m=1.
A common 1N4148 as a multiplier to generate a 10GHz signal. So the 23th harmonic of 437,069792MHz should generate a signal at 10489,656MHz and at the LNB IF output at 739,675MHz.
So i took my good old FT-817 at 1W output, a 20dB attenuator and a LL4148. The attenuator matches the RF output of the FT-817, and the diode gets about 10mW which should be enough to make it scream at 10GHz (see the pictures).
And....TADAAAAA....the expected signal only a few kHz aside.
So i assume, that the modification was successful so far. I did the same test with an unmodified LNB and the signals are compareable.
Now it can go on
Edit: Should be the 23th harmonic...
Hallo Peter,
vielen Dank für die Antwort.
Ok, Satlex kenn ich natürlich. Mir war nicht bewusst, dass ich den gleichen Skew wie von BADR 4/5/6 auch für QO-100 verwenden kann. Auch gut
73, Thorsten
"When the hurlyburly's done..."
So finally the TCXO is stacked and in place (see the attached images). The PCB fits snugly into the housing again. There should be a millimeter or so between the highest point of the stack and the cavity's edge.
Inspired by DL5CN i omitted a coupling capacity between the TCXO and the PLL. I don't know the internal architecture of the oscillator driver circuit, so i used XO1. Good to hear, if XO2 will work too, so there is a plan B
Attached you'll find the final modification block diagram with some details around my TCXO.
Next, I'll check if my "FrankenLNB" could be revitalised. Keep your fingers crossed
73, Thorsten
I agree. This will be an option for me, when the new AMSAT downconverter is able to deliver a reference clock for the LNB. In this case i will modify a second LNB-PCB with that resonant clock feed which will suit perfect to the existing cavity of the LNB.
In the meanwhile i will use the more or less good solution with an internal TCXO. Currently this gives me the most flexibility with a suitable result
Thank you for the hints. Is the clock fed to XO1 (pin 12)?
I expext a similar internal oscillator design at the TFF1015HN...
Thank you Heiner. Unfortunately the datasheet gives no information about the maximum output current of the 5V PLL supply. If the 4202 could deliver additional 50mA, a much smaller 5V/3V3 low droupout regulator could be used instead of the fat SOT89...
Display MoreDL9SEC...
maybe it is easier to ask the HAMs which have modifications done ..which really work...
JUST a note...
73 de dg0opk
??
Hi,
it never happens as you expect....
In the last week of August i got my "DuoBand-Feed 2,4 / 10 GHz - LNB" from BaMaTech (https://www.bamatech.net/anten…-feed-2-4-10-ghz-lnb.html). A real great piece of hardware.
Before buying, i asked Markus for the LNB type to know how to modify for a TCXO and he told me, he uses a Opticum Red LSP-02G.
So i was happy so far, the LSP-02G seems to be easy to modify. All parts on top, everything accessible and well known (see http://www.pabr.org/radio/lnbl…lnblineup.en.html#LSP-02G).
Then the parcel arrived and i opend the LNB housing which was labeled "LSP-02G". But something was wrong, the LNB doesn't look like a "LSP-02G"....Damn! (BTW: i don't blame Markus for that, just my bad luck!)
I opened the LNB housing and removed this flimsy LNB-PCB which was sealed with silicon rubber and....teared off the pad where the F-connector was soldered. So this PCB couldn't be modified anymore.
I analyzed the PCB and it seems, that Opticum now sells the Opticum Red "Robust" as "LSP-02G" (see http://www.pabr.org/radio/lnblineup/lnblineup.en.html#Robust).
The differences of the both boards was the solder mask (green at the LSP-02G instead of black of the Robust) and the code marking of the transistors. The block diagram can be found at the attachments.
The LNB is a "two chip" design with an integrated power supply chip D4202 from Silicore for all LNA stages including a 22kHz detector and a NXP TFF1015 PLL/mixer. Unfortunately there is no datasheet for the D4202 available. Hopefully the external clock can be fed through XO1 of the TFF1015.
The modification of this type of LNB seems to be really hard. The is only a little cavity on the bottom side where the crystal is soldered, where modification parts can be placed.
So i decided to order two Robusts and give it another try to do a TCXO modification.
The silicon seal can be removed very good with "SOUDAL Silicon Remover". If everything has been cleaned (PCB, housing, ...) the crystal has to be removed carefully.
I put some kapton tape at the area of the crystal and placed a STM L78L33ABU there. The supply can be connected to a via near this area.
Next i will place the TCXO on top of the regulator and connect it via a 1nF capacitor to the crystal pad which leads to XO1 (the block diagram of the modification isn't that detailed!). In progress, stay tuned...
The crystal cavity of the LNB housing is isolated with kapton tape to avoid short circuits of the extra parts with GND.
As an intermediate result i would say, that it would be possible to modify this LNB for TCXO usage, but it is nothing for the feint-hearted. You need a good microscope, good tools and a steady hand.
It would be easier to insert a series resonant circuit for external clock sourcing (which I do not prefer) or to use an external correction.
The modification hasn't finished yet, so I am curious, if the LNB will work again.
Just for your information...be warned
73, Thorsten