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| Sorry for the blurry photo. The modem is inside the white box beneath the FT-817. Nice and tiny. |
This are the results so far on 20m with 1W on the base antenna which is a coppertape vertical at 9m high.
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| Red spots are received, green spots are sent |
Tuesday, April 18, 2017
Preliminary portable digi tests
Unfortenately I'm not a fulltime experimental radio researcher. Wish I was and could do that for a job. Just experimenting with antenna's, setup, power, supplies etc. ect. Unfortenately the real world is different. I have my 45 hour a week job and besides that my family which are both very important. The 5 or 10 minutes left are for radio experiments and writing articles for this blog is done in the evening or at lunchbreaks on my job.
Since a light weight portable activation is upcoming I'm trying to have my portable radio package as small and light as possible. I already downsized my power supply. I now had to downsize my soundcard modem and yes, you can buy things. But I still had my unfinished prototype of Julian G4ILO's design VOX modem. I decided to take that and finish it. I already had a case to build the print in and after a first test it seems to work reasonable. Only problem was a much too high input and output signal which I solved with 5K trimmer potentiometers in the line. Now I have a decent signal in the waterfall and can transmit without ALC reading on the radio. I left the test setup running as duty called, actually I forgot it till next day. The problem always is that I have to leave my shack during experimentation as there is always something more important to do.
This are the results so far on 20m with 1W on the base antenna which is a coppertape vertical at 9m high.
Software is JTDX 17.6.1 which is doing fine on my old XP laptop. So far I only made one short QSO on PSK63 with FLdigi. I then noticed I should sort out the macros for transmitting. Time to do some more tests if there is still time left.
This are the results so far on 20m with 1W on the base antenna which is a coppertape vertical at 9m high.
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4 comments:
Hallo Bas, interessant en vooral een leuk item wat mij ook tot denken zet. Ik vraag mij af waarom de VOX en niet een standaard CT-62 kabelinterface ertussen. Audio kun je zo doorkoppelen, e.v.t met 2 scheidings-trafootjes.Ik ben zeer benieuwd. 73 Hans, PE1BVQ
Wat doet een CT-62 kabel interface? Dan moet ik dat weer kopen. Dit project had ik nog liggen en voldoet prima. Scheidingstrafo gebruik ik niet in dit prototype, misschien in het volgende bouwsel. 73, Bas
Hopi Bas, een CT62 kabel met interface kost bij Hamshop ca. 36 euro maar op internet zie je ze al voor 15 -20 euro incl. shipping. Voordeel is dat je met o.a. HRD of met FT817 Commander de FT-817 kunt besturen etc. Maar als jij de spullen er al voor heb liggen om alleen maar digimodes via VOX te werken dan kan ik dat wel begrijpen. 73 Hans, PE1BVQ
Hallo Hans, ik hoef niet persé de FT-817 te kunnen besturen. Het gaat mij er om dat ik op zijn minst WSPR kan doen. Kan zelf wel aan de set draaien naar de juiste freq. Misschien dat ik in de toekomst wel wat anders koop. Maar dit kost me niets want ik had alles al een paar jaar liggen. Daarnaast is het ook leuk om zelf wat te prutsen. Voordeel van VOX is dat je niet met COM poort instellingen zit te rotzooien om de FT-817 uberhaupt te laten zenden. 73, Bas
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