Posts by PY1SAN

  • Variable gain amplifiers and band pass filters for TX

    Hi VA2SZM


    It's very good to have new colleagues at a club.


    The output of SDRs are low power, and generally don't have many filters at the input or at the RF output. This makes it flexible in terms of use (works on multiple bands), and at an affordable price.


    We avoid using relays or solid switching devices, as they have a lot of losses, noise, and cost a lot of money.

    The idea of switching the input, output, bypass generates many problems. In other words, having multiband equipment at a few GHz is unfeasible for a low-cost assembler.


    Ham prefers to assemble separate amplifier pallets. One for each band. These amplifiers have amplification stages, as needed P1dB, IP3, and have band pass filters within the desired frequency. Due to power levels, filters are separated for each stage and desired band.


    An comercial HAM equipment (below 1 GHz) is most often built with an output power between 5 and 100 watts. For VHF and UHF satellites with 5 to 50 watts.

    With 1 watt and depending on your location, you will make local contacts.


    The input and output of an amplifier is a reference to the RF signal.


    The variable gain amplifiers that I know of are for use in laboratories (generally under 10 watts) and cost a few hundred dollars. We generally calculate the gain of our antennas (VHF and UHF satellites we use directional Yagi antennas with at least 10 dBs of gain), the cable losses, and use a larger amplifier than necessary. Some commercial radios have adjustable power (0 to 100%) or programmed levels (5, 25, 100 watts).


    Sandro Ribeiro

    73 de PY1SAN

    GG77

    Rio de Janeiro - Brazil

  • WSJT-X improved supports full-duplex

    Great news df2et .


    73 de PY1SAN

    GG77

    Rio de Janeiro

  • Building a CW-only transmitter for 2.4 GHz

    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


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    73!

    PY1SAN

    GG77

    Rio de janeiro

  • External reference from ICS512 (PLL CLOCK MULTIPLIER)

    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

  • EP-AB003 linearity

    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


    PY1SAN

    GG77

  • My setup progress (YO8SEP)

    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


    There are others threads too.


    73!

    PY1SAN

    GG77

  • Richtkeule von Wendel und Potys

    Great !


    PY1SAN

    GG77SN

    Resende - Rio de Janeiro - Brazil

  • Loosing RX while Transmitting

    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

  • Leistungsmesser, Milliwatt- Wattmeter von 10MHz bis 10GHz

    Hi !


    I tested this equipment some months ago:


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    I sent personal mensage with the driver + software (dg0opk, DL3ED, DL2SBA).

    If you have problem to receive the mensage, please let me know.


    73 !

    PY1SAN

    Sandro Ribeiro

    GG77SN

  • Chinese RF Power Meter

    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.

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    This one I have the software.

    py1san at hotmail.com

  • Software DVB-S demodulator

    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

  • S21RC QO-100 station build from scratch - discussion and help

    Congratulations Fazlay s21rc .


    PY1SAN

    GG77SN

  • Does it make sense to multiply 10MHz reference?

    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