Equip the LNB and the converter / transverter with a GPS reference (not essential even if recommended) Adjust the receiver filter, if possible, to 2.8kHz or better to 3.1kHz, as with high speeds the VARA modem requires more bandwidth Adjust the audio level of the analog receiver or the SDR so that the VU meter of the VARA SAT modem is in the first green segment after the initial yellow segment, around -30dB of signal, to avoid false decoding
Install always the last version of the Winlink Express program: Install always the last version of the modem VARA: Today also Michael DG0OPK has tested the system even if with low speeds because the VARA SAT modem was not registered and therefore without enabling high speedsĪfter several tests these are the suggested configurations to achieve good connection results:
With the new modem VARA SAT 3.0.4 of Jose EA5HVK and with AFC of +/- 150Hz max, you can manage quite well also transverters drifts not equipped with GPS reference and this is very important, even if with a slight decrease of performance. These are the screenshots reported from Oscar DJ0MY:Īll these tests are of great importance and give the idea of how the system can work even with a simple configuration. This evening after the excellent results of email transfer with large attachments obtained with Gustavo PR8KW from Brazil with system without GPS and light drift in transmission up to 100Hz after about 10 minutes, another excellent result with Oscar DJ0MY with station equipped with GPS, that has transferred 10k of attached in 2 minutes and with a constant speed of 2000bps with the new 3.0.4 VARA SAT modem registered.
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