Posts by ON4CJQ

    Hi Thomas,

    You are right in some way, yes, i agree to use full duplex on sats which is easier to compensate the doppler shift; you can do it also on semi-duplex, but harder to make qso's.

    But QO-100 is geo-stat sat without doppler. So i don't see any problem not hearing your own signal.I have different setups for working this sat, since i'm active from the first day, all to be used in a different way, but have 1 favorite,hi.

    73's Jerry

    Ok Robert,

    To bad from CMO, but a lot of suppliers have troubles since the pandemic started.BTW,never got complaints about working simplex. Once your signal is ok, it doesn't make a difference to be on air in any way.And needing to hear yourself,hmm, that's why a lot of stations have echo's when transmitting and delayed reception at the background.I don't think you listen to your own signal too when working split on HF? I guess not.

    When using your trx's, a suggestion: dx patrol tx board+ampli with 10m IF using 7300, and for RX a simple modified lnb injected by a ref signal between 25-26MHz (if internal xtal is 25MHz) to receive directly at 439MHz on IC-7000, antenna feed could be a helix in front of the lnb(cost effective). Or Kuhne Electr if money is not a problem. For rx see, has a G0MRF rx board directly from lnb into 2m and 739MHz(sdr-stick)

    73's, Jerry

    Hello Robert,PC5E

    Why not thinking about PE1CMO? Simplex with IC-7000 on 70cm? NEVER problems for tuning uplink and downlink, you only need a 10MHZ for locking. That's all!! Most easy working setup on QO-100. Now a lot of people are still tuning around while tx-ing to their receiving part,because they just don't know how much the offset is between their rx part and receive part. It is very much annoying.

    Such a schematic looks messy due to all different part which need to be used. For some it's fun for building it all together, others like it more straight forward and easy to use. If you like some pictures, i can sent some to you. At first i was using duplex station also, but to much equipment etc was used. But of coarse, the price may be an issue. Try to make a stand-alone station, completely works best. That's my opinion.


    VQlog from EA6VQ, very good for logging all, but mainly here for VHF and up and SAT qso's. Easy for uploading to LOTW, EQSL...

    Don't forget to use SAT as propagation mode, and the right sat-name and tx freq band, like 13cm on QO-100, and not the IF freq.

    73's, Jerry

    I also upload on eqsl and LOTW, easy to do. But on eqsl, i reject more then 30% of received qsl's because a ot of people log SAT qso's as a simple band qso, and that is a big difference. At eqsl you can see all received qsl's, even if those which are not logged as sat qso; on LOTW you can't see uploaded qsl's if the don't match with your uploaded log. I don't accept for example a QO-100 qsl if it just logged as a 13cm contact, neither from the LEO-sat contacts.

    It is also important to use the TX freq for logging a sat qso, and not the RX freq; RX freq is used by SWL's.

    A lot of qso's aren't confirmed yet, i guess not that much people use LOTW, but morelikely EQSL...or just nothing.

    73's, Jerry

    How about the dozens of ham's who use the web-SDR as receive system, because their own system isn't working that good on rx or even don't have an rx setup, isn't this remote too?

    73's Jerry

    This is my portable setup, the only thing you don't see on the picture is the FT817 and dc supply.

    35cm with well tuned helix 5.25t and with 6W only, i have 3dB less sig in peaks then upper beacon some weeks ago,so before the wider bandwidth we have now on the transponder.

    It's working better then the patchfeed. I have made a comparison list with different antennes for uplink, i will post it here later.

    Hmm, looks file is to big, need to change size first.


    you can make a mall on a foam plate, calculating X and Y axis values and write them down on the foam. You will get a nice parabole and cut it out carefully. Check the shape off your dish and use the mall for resizing your dish to a bigger reflector. Also the position of the feed changes. When using mesh on 3cm, theory says 1/10(3mm) but that is too big. In practice 3mm*3mm is maximum use on 3.4GHZ. Try to use 1mm*1mm or smaller. Also the shape of the complete dish surface must be within 1.5mm.

    I made a mall for a mesh dish extension from 1.90m to 2.7m,but doing the extension will be in a few weeks when it's getting warmer.

    73's Jerry

    As far as i know, i thought 3A is not allowed above 70cm for amateur use, or am I wrong?

    If it was allowed, i would be activated last september by one of our clubmembers.

    But i could be wrong.


    I now assume that the LSP-02G is meant for center fed dish ?

    I don't think it's for a prime, seen at the shape off the horn. Prime use more the Chaparral design.

    Anyone has an image of a seperated lnb from its Bamatech waveguide?

    It should be easy to change the lnb into another brand, but i'm not sure.I don't have a Bamatech.

    Mine is DC5GY duoband feed with modified lnb on the back off the waveguide.

    Hello Jan,

    I have a modified octagon on my dualband feed too, but never leave it powered on. No problems when powering on, in less then 2min all is stable here. Even in weekends, i just switch the power on for the complete station when i want to work the sat. Good luck and welcome to the transponder.

    73's, Jerry

    Logging sat-qso's: Use TX freq instead of RX-freq. An SWL uses the RX freq for logging.

    So band is S/X and not X/S and on LoTW QO-100 and not QO100 as satellite, mode SSB or..., propagation SAT.

    When confirmation is poor, there could be a few reasons: wrong parameters used by 1 or both stations when uploading; not much OM's are using LoTW

    73's Jerry

    I fully agree to work in split when DX is on the sat, because some stupid ham's still love to use too much power to get over the pile-up. In split, also weak stations have a bigger chance to work the dx, and as DL5RDI mentioned, you allways hear the DX station talking.

    What is, in my opinion, the benefit of working full duplex? There is no need to here yourself. Just working simplex here and never had any problems, no need to hear my own voice. Worked also in split with the FT817, 2m as IF TX band, 70cm as RX. Just check only once the freq offset between up and dwnlink, allways right afterwards.

    It's irritating that people still need to tune on the right freq, giving an echo on their modulation when they go on air because in the background some sdr-stuff's volume is too high.


    I received the downconverter (completely build in box) without any problems, no taxes etc. I think it is just the way how the package is sent to you, meaning what is written on the paper on the package; and the price of the goods. Best is to ask him first and tell him that there could be a problem with taxes etc in your country.




    Not the first time i sent some personal emails to operators who were having a signal which was too strong, 6-12dB above PSK bcn.

    Some do understand, others just blew away the comments.

    Let's make a public list with stations who do have such stronger signals then the beacons.

    Especially when a new dxcc is in the air, a lot of stupid op's use suddenly too much power to be the strongest in a pile-up.

    Why why why? Just follow the rules and enjoy the sat, even in a pile-up.

    Hear you all,

    73's de Jerry