Posts by PY1SAN

Quote from s21rc

Update:
60cm DTH offset antenna, unmodified 25MHz Xtal LNB - SDR Console locked to beacon.

Receive S9++ signal from my location (NL53er, elevation 14.9 degree). Monitored some station. Very clean signal (Leila was activating too frequently).

Now waiting for the TX parts and TCXO to arrive. Meanwhile will make the Helix antenna and keep it ready.

73, S21RC

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Congratulations Fazlay s21rc .

PY1SAN

GG77SN

Quote from PY3PK

As an update, I was able to feed directly 10MHz into my Rev. C/D Pluto. I used a 0.9Vpp square signal from a ENE3311B. Had to run, as per https://wiki.analog.com/university/tools/pluto/devs/booting:

Code

fw_setenv refclk_source 'external'
fw_setenv ad936x_ext_refclk_override '<10000000>'
pluto_reboot reset

This way, 10MHz was enabled from the external input.

Congratulations PY3PK .

Does it work fine with 10 MHz?

PY1SAN

Resende - Rio de Janeiro.

GG77SN

Quote from s21rc

Hello OM,
Greetings from Bangladesh. I have been gathering as much info I get about activating QO-100 - very interesting, I have the following two questions, can anyone please advise:

1: Minimum Antenna dish size for receiving QO-100? (off the self Ku Band 80cm DTH antenna would be easy to stealth as DTH).

Info: From my location the antenna elevation angel is 15 degree - almost at the boarder of sat footprint. Please see attached.

2. SDR or Icom UHF radio (by modifying LNB PLL frequency)? Which one would give better receive?

My plan is to RX first, if all works then will work with TX.

Thanks in advance, 73, Fazlay, S21RC

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Hi Fazlay.

1: Minimum Antenna dish size for receiving QO-100? ?

The elevation here (Brazil) is around 10 degree and many stations work with antennas between 60 and 90cm.

I worked portable in GG88HG (Juiz de Fora - MG) inside the hotel with 75cm dish:

[Blocked Image: https://cdn-bio.qrz.com/n/py1san/HH88HG.jpg?p=ded797c9461a578420de6931737016b4]

2. SDR or Icom UHF radio (by modifying LNB PLL frequency)? Which one would give better receive?

I prefer SDR. I like "see" all the NB Transponder spectrum.

73 !

PY1SAN

SANDRO

GG77SN

Congratulations Florian.

73 de PY1SAN

Quote from DD1US

Hello Pedro,

the Pluto will most likely not work properly with a 10 MHz reference. A friend tested 4 or 5 Plutos and only one of them worked properly with reference frequencies of 20 Mhz and below. Therefore it is advised to use reference frequencies higher than 20 MHz, 40 MHz or even 50 MHz is strongly recommended.

If you generate your reference by using frequency doublers e.g. 40 MHz out of 10 MHz you will loose the same amount of phase noise performance as running the PLL with a lower reference frequency. Of course this is only true if the doubler is ideal and also the PLL.

In a latest design Kurt DJ0ABR has developed a simple unit using a 100MHz OCXO and 2 dividers :2. With this we generate 50 MHz for the Pluto and 25 MHz for the reference frequency of the LNB. Simple and very good. The circuit of Kurt allows also to lock the OCXO additionally to a GPSDO. I have buil this up and it works very fine. The GPSDO is not really needed as the OCXO is very stable.

Kind regards

Matthias

http://www.dd1us.de

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Hi Pedro.

Great project !

Link:

https://projects.dj0abr.de/doku.php?id=en:sat:plutolnb

73!

PY1SAN

Quote from DC7KG

Hi Sandro,

I've just got the data sheet of the RTL203004. It is a TCXO with 3.3 V supply voltage.

73, Detlev

Very interesting.

73 !

Sandro RIbeiro

PY1SAN

Quote from DC7KG

Hi Sandro,

I suppose you can't reach the recommended phase noise values with a clock multiplier. I am waiting for a 40 MHz OCXO (KVG RTL203004) from eBay.

73 Detlev, DC7KG

Hi @DC7KG  Detlev.

I haven't experienced with 40 MHz OCXO. I use the ENE3311B here. 10 MHZ output. I hope very successful for you.

73 !

PY1SAN

Quote from DC7KG

Hi,

today I've used the OSC101 as external clock. It is completely useless. I transmitted on 2.4 GHz with the internal clock (image left) and with the OSC 101 as external clock (image right).

73 Detlev

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Thanks @DC7KG  Detlev.

Very interesting.

73!

PY1SAN

Quote from SWL-Muhammad Irfan

Ok thank u ddius

What about this given pic ocxo ix this work . It printed from back side some kind of multiplication. And is any coding required in putty for external clk

Hi Muhammad.

This link below have some info about this module (use ICS512 or NB3N502):

Thread

External reference from ICS512 (PLL CLOCK MULTIPLIER)

Hello All,

FYI - some results of testing the formation of the 25 MHz reference signal for the LNB PLL and 40 MHz reference (for the VHF SDR ADALM Pluto) based on the ICS512 chip (PLL CLOCK MULTIPLIER) at http://www.ra3apw.ru/proekty/ics512_reference/. Please use Google translator.

The 10 MHz OCXO with phase noise -154 dBc / Hz @ 10 kHz acted as the main source of the reference frequency.

As a result: 25 and 40 MHz signals are formed, stability is good but the phase noise value (-99 dBc/Hz @ 10…

ra3apw

Apr 10th 2020

73.

PY1SAN

Sandro Ribeiro

Quote from VU3WTJ

I brought a prime focus dish (120cm diameter; photo attached) and a KU band LNB with four ports [Solid Dilos Ku-Band Universal Quad LNBF]. (Photo of LNB is attached). My grid location is NL06lt (India). Please guide me on following points:

1) How to focus or position the dish antenna?

2) How to adjust the skew of LNB?

3) Any instrument or method to measure proper azimuth, elevation and skew angle?

4) Any TV channel at my region can be taken as reference?

5) Which port of this LNB can be used for WB and NB?

6) How to know the IF frequency of my LNB? Which can be fed into SDR console for initial setup

Please help me on these. I think many newbie will get help from this doubts. 73

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1) https://eshail.batc.org.uk/point/.

2)https://eshail.batc.org.uk/point/.

3) I used one very cheap SDR. Sorry. 2019 methode: RE: Es'hail-2 beacon frequency (non-amateur)

4) I know only the TP WB & TP NB. Sorry. 2019 methode: Es'hail-2 beacon frequency (non-amateur)

5) I used only the voltage methode NB <18v>WB.

6) Generally is 9750 MHz.

Welcome the best TP amsat !

Quote from 2E0ILY

....set and a TX offset of 6089.5MHz set. Is this TX offset correct please?

The TX offset is 8089.5 MHz.

Quote from ON7CL

Hello,

Some time ago I did read a nice article from a pluto boxed for qo100, it was a German ham I don't remember his call and I can't find the article. Anyone knows where to find ?

I tried via search but nothing.

Thanks in advance.

Rudi / ON7CL

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Hi Rudi.

I use a aluminum box enclosure in my Adalm Pluto.

Link:

Adalm Pluto Mods

73

PY1SAN

Quote from PA3FYM

Feng showed me the inside of his LNB. It has an RDA3566 chip, which doesn't have a 'symmetrical oscillator' (aka kalitron), so 'balanced' feeding does not work. It works perfectly for the NXP chips like I revealed/published in 2019 (or so).

For the RDA-chips there is an 'input' and 'output' pin (where injected levels differ around +20 dB (relative to the input).

I tested this balanced method only this year. Here the chip is RT320M.

Have you changed the TCXO of your Pluto ?

Quote from s21at

what brand and model of band pass filter is required after the pluto sdr?

also is there any suggestion for bias-t?

any tested models for buck converters as I am afraid of high noise or is that something not concern?

Some SAW BPF:

73 ! PY1SAN

Tnx @SWL - markro92 !

Quote from DB2OS

Hi Bert,

I use Airspy R2 SDR, SSB SP-200 Preamp and ANjo Eggbeater.

It's only a very simple setup at the moment to run the SatNogs software, but it works very well to see what's going on in the 2m satellite band.

73s Peter

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The signals recorded on your station's SATNOGS are strong. Impressive for a simple Eggbeater. Very good signals.

Tnx Marcel !

Unfortunately here dont have fleamarket with SSPA! I thinks in the future is possible. I buy some things of others countries.

Great !