MY QO100 SETUP

    Quote from SV1BDS

    Hi,

    Bad news, when I try to do it ad9364 it display Bad crc,using default environment and when reboot failed to get ready any more. Any ideas ???

    DD0KP I finally put the Pluto in DFU mode and upload pluto.dfu without success but when upload uboot-env.dfu it boots !!! Now it has 0.31 & modification. I hope that it will continue to work. Thanks again for your help !!!

    HB9SKA Hi, I plan to buy one more at least and I want to verify quality before promoting more this LNB. It looks like very promising. I was using until now LSP04H from Globo and I want to ask you if it is the same as mine as I have seen that you have a same model from Opticum. Have you opened yours ? If yes is it the same as mine inside ?

    • Official Post
    Quote from SV1BDS

    HB9SKA Hi, I plan to buy one more at least and I want to verify quality before promoting more this LNB. It looks like very promising. I was using until now LSP04H from Globo and I want to ask you if it is the same as mine as I have seen that you have a same model from Opticum. Have you opened yours ? If yes is it the same as mine inside ?

    No, I don't open it. But it's possible that's the same LNB. Products with same model name can be distributed under different brands. I googled this one.


    73

    PA3FYM

    4957 14 31244 871 Locked 11 5143 250 125 31327 803 1022 -1 65535 65535

    4958 1 31244 865 Locked -13 5142 250 125 31327 797 1023 -1 65535 65535

    4959 13 31244 871 Locked 12 5142 250 125 31327 804 1024 -1 65535 65535

    4960 3 31244 870 Locked -10 5141 250 125 31327 799 1025 -1 65535 65535

    4961 12 31244 877 Locked 9 5141 250 125 31327 804 1026 -1 65535 65535

    4962 4 31243 873 Locked -8 5140 250 125 31327 800 1027 -1 65535 65535

    4963 10 31243 873 Locked 6 5140 250 125 31327 807 1028 -1 65535 65535

    4964 4 31243 872 Locked -6 5139 250 125 31327 802 1029 -1 65535 65535

    4965 11 31243 881 Locked 7 5139 250 125 31327 808 1030 -1 65535 65535

    4966 1 31243 877 Locked -10 5138 250 125 31327 801 1031 -1 65535 65535

    4967 11 31243 881 Locked 10 5138 250 125 31327 808 1032 -1 65535 65535

    4968 2 31243 878 Locked -9 5137 250 125 31326 801 1033 -1 65535 65535

    4969 11 31243 885 Locked 9 5137 250 125 31327 811 1034 -1 65535 65535


    TNX !!!

    SV1BDS Perfect , did you calibrate it with h1 = 0 and h1 = 65535 ? From that you can calculate the gain of the algorithm.


    Your x10 looks nominal , just in the middle of the ADC range ( 0 - 1023 / 2 = 512 * 10 = 5120).


    Admit, that 12 U$ OCXO isn't bad at all, isn't it?

    PA3FYM The internal resistance of ocxo is small and load the high Z output so I add a opamp buffer. I calculate the gain but I will recalculate it as I have to do some minor improvements.

    Yes very good equipment for this price !!!

    I am thinking of designing a PCB for this.

    If you want beta testers of your Lars improvements software it exist one more.

    TNX again !!!

    SV1BDS My implementation of the Lars GPSDO is fed with 220V.


    A small 10V transformer -rectified, blah blah- goes into a 7808 (decoupled etc).


    The Arduino is connected to that 8V point, as well as the Ublox Neo 7M fed from 8V with a capacitance multiplier (with resistor divider in the base). The OCXO has a separate capacitance multiplier (with resistor divider in the base and the cap is 1000 μF, so the effect of the cap will be 100000 - 200000 μF or so). With a capacitance multiplier the capacitance of the elco is multiplied by the Hfe (or β) of the transistor and therefore denoising the power supply, which improves stability and/or phase noise.

    PA3FYM It seems that its working ...

    11974 -21 33582 985 Locked 14 4804 1500 750 30197 853 102 0 0 0

    11975 -4 33582 1019 Locked 17 4805 1500 750 30197 864 103 0 0 0

    11976 -18 33582 989 Locked -14 4805 1500 750 30197 855 104 0 0 0

    11977 -17 33582 1006 Locked 1 4805 1500 750 30197 856 105 0 0 0

    11978 -32 33582 982 Locked -15 4805 1500 750 30197 847 106 0 0 0

    11979 -46 33582 1001 Locked -15 4804 1500 750 30197 839 107 0 0 0

    11980 -55 33582 970 Locked -9 4804 1500 750 30197 830 108 0 0 0

    11981 -57 33582 968 Locked -2 4803 1500 750 30197 833 109 0 0 0

    11982 -58 33582 989 Locked -1 4803 1500 750 30197 830 110 0 0 0

    11983 -54 33582 971 Locked 4 4802 1500 750 30197 832 111 0 0 0

    11984 -49 33582 969 Locked 5 4802 1500 750 30197 834 112 0 0 0

    George, I filled in your contact form on your website, i.e. check your mail ; -)


    What gain factor did you determine with your OCXO?


    Edit: Made a screenshot of my contraption a while ago, see below. Note the large TC (941 s), an indicator that the stability is good, which is confirmed by a non varying DAC value (in my case the DAC apparently converged to 24029).


    PA3FYM I did not received your email , even in spam , PLS send to call at y@h00.c0m.

    With h1 and h65535 I get (without order) 850 & -750. So I set 42.

    I stop increasing TC to 1500 not because I loose lock but in order to test other thinks. The DAC is varying no more than 2-3 . I archive this using a red one NEO6M that costs me 2.5 euro ...

    Yes, the cheaper the GPS module, the better it works ;; -)


    With the normal software, when you have a long TC initially , then it takes ages for a lock.


    What I do is the following:


    1 warm up time = 10s (i.e. short)

    2 initially TC = 16 and wait for lock (usually few minutes)

    3 if lock, check every TC if there is a lock

    4 if lock and DEMA of nanoseconds is below certain value, increase TC with TC>>4 and goto 3

    5 if DEMA is above certain value, decrease TC with TC>>4 and goto 3

    6 if system once locked but lost lock (for whatever reason) halve current TC and go to 3


    DEMA = Double Exponential Moving Average (of the nanoseconds variable, i.e. differnece of the system vs GPS PPS

    Lars says that had problems with red ones , I do not have at least with this one ...

    I hope is not the same as the LNB ... The first one is good ...

    Also I do need to use the NEO7.

    Yes at takes ages I was disapointed but I use a procedure similar to yours.

    I noticed that current of OCXO is high for about 2.5 min. It stabilizes the frequency at 5 min. So I put warm up time to 5 min. I begin also with TC 16. When the second field is takng positive and negative values alternative in the last about 10 values I try to increase TC. If it is success I leave it If it fails I return to the previous value and it locks. I have not loose lock yet. I increase in smaller increaments than you. When TC is bigger it takes more time to be ready for increament. If I loose 1 PPS or 10 MHz I start from the begining (TC=16). I noticed that as time passed it can accept bigger TC as far as the DAC value is stable. I want to test with a high TC to close the aircondition to see if it will loose lock ... I have not read the source code but I believe that such mods are relative easy to applied - I think you have allready done this.