Posts by PY1SAN

Quote from df2et

Dear Ops,

DG2YCB has released a test version of WSJT-X improved which supports full-duplex i.e. decoding of downlink signals during TX phase. This way you can control and correct your own uplink signal. Transmitted and re-received own transmissions are shown in the same color (default yellow) as on the TX page right. Its still a test version and may be buggy but Uwe and team are looking foward to feedback.

The code can be downloaded here:

https://sourceforge.net/projec…iles/WSJT-X_v2.7.0/Tests/

The full-duplex functionality is enabled in "Decode" menu. See screenshot attached.

vy73 de Florian DF2ET

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Great news df2et .

73 de PY1SAN

GG77

Rio de Janeiro

Quote from M0AGP

Apologies - it looks like this question doesn't fit into any of the obvious forum categories!

I was wondering if it would be practical to build a CW-only transmitter for 2.4 GHz?

I'm hoping it would be reasonably easy to do (obviously not as easy as on HF!).

Maybe a lower power 2.4 GHz amplifier could be made to oscillate in a clean way using a tuned circuit?

I expect this is a very naive question...

Thanks for educating me!

73

Mike M0AGP

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Hi Mike.

CW QO-100 Transmitter:

Thread

QO100 CW QRP TX

Hello all, we (OM2JU, OK1CDJ) have developed simple CW QRPP (450mW) TX based on 2.4GHz LoRA module.

• Paddle input -IAMBIC keyer
• Straight key input
• Change frequency, power, keyer speed by rotary encoder
• Frequency callibration
• Beacon mode
• cwdaemon compatible UDP server on port 6789
• WiFi client or AP mode
• Web interface for WiFi config
• Web interface for tuning, change speed and power

More info: https://github.com/ok1cdj/SX1281_QO100_TX

forum.amsat-dl.org/cms/index.php?attachment/7149/

OK1CDJ

Nov 5th 2021

73!

PY1SAN

GG77

Rio de janeiro

Hi Simon.

XW4KV worked some grids in Laos (https://f4bkv.net/xw4kv.html) recently (Dec 2022).

According to the website https://f4bkv.net/station.html, he used a 120 cm antenna and only 2 watts.

My friend Gustavo CX/PR8KW operated Uruguay in Locator: GF37ei

with portable small antenna, low power with < 0.2° elevation with excellent signals.

73 de PY1SAN

GG77

Rio de Janeiro

Quote from AI5GW

The ICS512 and similar devices have never been great performers in regards of phase noise. To my knowledge, these ICS-chips are also no longer manufactured. Renesas offers much better clock generators / jitter attenuators, like the 5P49V6975 or RC22504A. I actually just ordered a bunch of both devices a few weeks ago. Since they have multiple, independent outputs, I'd like to experiment with a versatile 10 MHz to some other frequencies translator prototype. It might be possible to use these devices to generate all the different frequencies one might need for a QO-100 set-up with just one device.

Great!

PY1SAN

GG77sn

Rio de Janeiro

Quote from DC7KG

The YouTube Videos from PY1SAN are very interesting, they show his oscillator ADF 4351 and the mixer.

Detlev

Hi DC7KG and lz2ilr .

Yes, it's an easy project. It uses off-the-shelf boards.

I've built a few Up Converters using simple components (or some modified stages).

LINK : https://hackaday.com/2021/07/3…ot-be-impossible-to-make/

Any questions, please contact me.

Sandro Ribeiro

PY1SAN

GG77SN

Quote from PA5Y

Does anyone have a datasheet for the YP 242084 amplifier and the YS 1802 regulator used in this PA?

I know only Innotion YP242034:

https://forum.amsat-dl.org/cms…ionyp242034datasheet-pdf/

Post

RE: AMSAT-DL 2.4 GHz / 6W Power Amplifier für QO-100 mit ADALM-PLUTO

Hallo,
das wäre wirklich eine tolle Ergänzung für den Pluto. Aber gibt es bereits Messwerte bezüglich Intermodulationsverzerrungen etc. bei voller Ausgangsleistung von 6W? Ich habe gerade kurz das Datenblatt vom SKY66292-11 überflogen und konnte auf der Schnelle (außer Gain) keine wesentlichen Vorteile gegenüber dem YP242034, der wohl in den oft kritisierten chinesischen "4W" bzw. "8W" WiFi-Boostern verwendet wird, erkennen.
73 de Roland


https://www.skyworksinc.com/-/…0/SKY66292_11_203282E.pdf
…

DM5RM

Aug 24th 2020

PY1SAN

GG77

Quote from YO8SEP

I will remove the Quartz and the 2 capacitors. Remove solder from one of the F connector and add 25Mhz. Can you give me more details about the ferrite bead transformer ?

73 Petronel

YO8SEP

Hi Petronel.

Thread

Other method to inject external REF into LNB!

Bought a second hand Triax110 dish with three LNB's for 20 Euro's total. Two LNB's were Inverto 'Red Extend' (never heard of this type). After opening it, it seemed that they contain a 25 MHz crystal, so a good candidate to submit to a novel external REF injection method.

Now both xtal pins are fed with the REF signal with opposite phase.
A friend of mine says this improves phase noise of the PLL.

Just tested the modified LNB and it works excellent! Look also here.

…

PA3FYM

Aug 3rd 2019

There are others threads too.

73!

PY1SAN

GG77

Quote from IK8OZV

Renauld,

Thanks for your description of the problem but what i cannot understand is why the issues does not pop up also

when i use an external PSU?

Please can you tell me with which one you have substitute it maybe also with a photo of it?

Thanks a lot

Enzo

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Hi Enzo.

You probably have some RF feedback on the power supply line at its T Bias. When you use external power supply you isolate this way. In the Bias T +12 VDC try:

- Use some ferrite (bead, core or choke).

- Use some capacitors for RF decoupling (or feedthrough capacitor).

- A shielded cable for power supply.

73 de PY1SAN

GG77SN

Quote from OE5PLN

Hallo, es gibt inzwischen die Variante im Alu Gehäuse mit 10GHz. Hat jemand die Software dafür (WIN 10!)

73 Peter

I tested a model of up to 10 GHz.

This one I have the software.

py1san at hotmail.com

Quote from St2nh

Hi all and seasons greeting . I'm looking for the last version link for DVB-S demodulator   . Thanks & 73

Hi St2nh Nader. The link is (page 40 this thread):

73 !

Version 2.1.0

Download: http://v.1337team.tk/dvb-s_gui_amsat.zip

Changelog:

• Added support for 16APSK and 32APSK modcodes
• Fixed demodulator using wrong modcodes in ACM/VCM mode
• Fixed a crash occuring while cleaning up buffers on program exit
• Fixed wrong scaling of TCP input samples using the F32 format
• Fixed IQPlot imaginary axis being flipped
• Removed QCustomPlot dependency

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 !