The reason many people don't work full duplex is because there is no radio that can work full duplex. For example: 9700 and so on... But WebSDR is a great tool to check your downlink. I always check my signal with WebSDR at the start of the first transmission.
Posts by BG0AUB
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LNB REF signal (TCXO inside the LNB & Ref fed by the duplex) has an effect on the output signal.
Recently, I measured and compared the spectrum of the output signal of LNB using different REF modes.
First measure the TCXO installed inside the LNB.The signal looks clean.Low base noise, good signal-to-noise ratio
The measurement then provides a REF signal to the LNB through a diplexer.
The output signal becomes very noisy.The signal-to-noise ratio is significantly lower.Has anyone done the same measurement?
I hope everyone can see what I post with translation software
73 DE BG0AUB -
I think the forgotten CN ：) on the form。de BG0AUB
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Using in4148 to do RX/TX switching, the isolation degree is about 24DB insertion loss of 6db... A special microwave switching diode might be better.
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-18db？As long as you receive good enough.No problem.18 db in the waterfall of websdr visible..
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If I don't get it wrong then yes;After connecting the bridge, perform 1: short circuit 2: open circuit calibration at the reflection port.Then I was asked to measure the same 915MHz antenna for comparison.The results are as follows:
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My bridge has a sealant can that won't open the case.But I think the internal structure is shown here.
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Again comparing with the results of the 50 ohm false load measurement, the results of the material measurement seem to be reliable...
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I bought a bridge about two years ago, and now he should be somewhere in the workshop, using him with PLUTO and theoretically measuring antenna return loss... Well, there seems to be a need for user calibration procedures
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Very good project.I used it to test a 2.4g cavity filter.There was little difference between the results and those measured by kc901.
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Seems this is agood starting point for qso's. Mny tnx Zhaofeng for FT4 QSO. He reportet 100mW , me still with 400mW. Zhao used a 60cm Dish. Mine is 90.
Was so dissapointed destroying my pa and at the end had so much fun.
Tnx guys.
73 Oliver
The next day I actually measured the final power reaching the antenna.Only 5-6 DBM...
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I posted this a year ago.Now a whole year has passed quickly.During this time I have completed 626 qos through QO100.158 grid Also completed the QO100 QSO in China. Also learned a lot of knowledge.Thanks to the warm-hearted friends who have helped me.
Sincerely hope more people appear on QO100 transponder...
73
zhaofeng BG0AUB
2020-02-24
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Some new work has been done recently.MRF21085 13 cm PA OUT: 40W
Traditional architecture upstream and downstream frequency converter.Can work at UP/DW 28/145/430
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With the coming of winter.Outdoor aerial need to quick and convenient way.I put my 60 cm antenna modified for ease of use.
LNB support bar can be folded, it is more convenient to transport and use and fast
The last piece of PA carefully debugging.Output 20 w +, including frequency converter in a waterproof container, CATV cast aluminum.
May be able to increase a through feeder power supply scheme.24 v3a power supply...
Now I have 4 sets QO100 earth station equipment (frequency converter + pa), I will send them to the interested in QO100 HAM friends around me.As soon as possible to help them more in the repeater.
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