Portable QO-100 Transceiver

    Hi all,

    A few months ago I started a Portable QO-100 transceiver project. I already presented it on Opensat Cubesat Workshop 2020.

    The project is going on very slow but there are some improvements that I wanted to share here so we can maybe continue on the project with all your help.


    A brief description about the project can be found in the following presentation :

    https://github.com/barisdinc/S…reOSCW2020_barisdinc.pptx



    Now here is a working demo for the reception part.

    https://youtu.be/ttV4EAqNRC4


    73's de TA7W/OH2UDS

    Baris



    And this is the second video with ADF4351 as a 1.1GHz Local Oscillator...


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    My goal for this weekend is to have it all in a tiny box....


    Baris

    OH2UDS/TA7W

    Yess... and i am back again..

    Last night I did some experiments for the transmission part of out tiny project.

    I was able to accomplish a CW QSO with DF2ET df2et


    My setup was

    - an arduino + lcd + a keypad

    - adf4531 frequency generator

    - SKT65xx 1W amplifier

    - 30Meters of RF cable

    - a poty with dish

    - an arduino sketch based on F1CJN and Guido's (uSDX) code


    Current capabilities

    - Can generate 2.4GHz uplink signals (1Khz steps for now, can go below as well)

    - Have memory save/recall capabilities (10 channels)

    - Have 10 CW message memory tha t you can shoose from menu and transmit

    - 1 watt (guestimate) output

    - works with 5V USB


    Later to come soon:

    - port GUIDO's SSB approach from uSDX and si5351 to ADF4531



    73's de OH2UDS / TA7W

    Baris

    Hi Baris,


    thank you for the CW QSO. Was a little drifty with a 500Hz CW filter but I managed to follow your transmission with small adjustments. Found your signal accidentially while browsing the waterfall. You were in the middle of the SSB part of the bandplan. I think if you called in the CW part 505-540 you would have had a few more callers :) The CW skimmer might have detected your there and spotted.


    vy73 de Florian DF2ET

    Yes, I know that I was in the SSB part, because I was trying to show my friends from TA there I can get on to the bird with a minimal station.. Then while having the QSO with you I implemented the CW messenger on the radio (arduino).... I was not using a keyer but arduino code to transmit.. That's why I was late answering your.. Each reply I sent you, I had to compile it into the code and retune to the frequency...


    after your QSO I implemented/completed the CW message memories and storing/retrieving memory channels :)



    best regards and 73's

    de OH2UDS / TA7W

    Baris

    Hi Baris,


    alright then. I was slow in switching back to SSB and re-tuning. I think Kadri TA1D was there in SSB trying to call me in the meantime. But when I was ready he/you had switched to Turkey and I did not call :)

    But interesting that I had a QSO with a pre-compiled machine :D Nevertheless it worked perfectly. The signal was absolutely 599 with some drift as I said. I should have used a wider filter instead I guess.


    vy73 de Florian DF2ET