OM0AAO (OM0A)

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  • Forum Replies Created: mcHF IMD and signal purity #15088
    OM0AAO (OM0A)
    Participant

    I was intrigued, because I think the receiver is excellent + options, provided by the SDR (filters, spectroskop) are definitely welcome. If it was clean, I could imagine supplementing mcHF with PA, thus creating a very competitive TCVR for conventional equipment.

    I don't know if it's a specific setting or a design feature…

    Forum Replies Created: mcHF IMD and signal purity #15086
    OM0AAO (OM0A)
    Participant

    But I only have the opportunity to measure over 21MHz airspi mini key, it's definitely not a very nice signal 🙁 It can't just be a setting?

    Forum Replies Created: mcHF IMD and signal purity #15083
    OM0AAO (OM0A)
    Participant

    TNX, Tono! I have already looked at the measurements on your website and also the experience of OM6IN http://om6in.blogspot.com/ (I have already looked at the measurements on your website and also the experience of OM6IN). I have already looked at the measurements on your website and also the experience of OM6IN, I have already looked at the measurements on your website and also the experience of OM6IN.

    I have already looked at the measurements on your website and also the experience of OM6IN (I have already looked at the measurements on your website and also the experience of OM6IN) I have already looked at the measurements on your website and also the experience of OM6IN 3 I have already looked at the measurements on your website and also the experience of OM6IN (I have already looked at the measurements on your website and also the experience of OM6IN, I have already looked at the measurements on your website and also the experience of OM6IN).

    Forum Replies Created: VHF antenna for home QTH for confinement #15080
    OM0AAO (OM0A)
    Participant

    so you won't have to list this. so you won't have to list this, so you won't have to list this.

    so you won't have to list this (GW4CQT, F9FT, so you won't have to list this, so you won't have to list this×3/7/8/9the. so you won't have to list this, YU7EF) so you won't have to list this. so you won't have to list this “so you won't have to list this”). so you won't have to list this https://om0a.cq.sk/amaterske-radio/yu7ef-yagi-ef0206-na-144mhz/

    Forum Replies Created: Source for TRX #14547
    OM0AAO (OM0A)
    Participant

    Every switched source produces interference. Sometimes it is already noticeable during reception in the form of recordings, growlers, the forest.

    It's worse when broadcasting, where the drawn current is larger and unwanted impulses are directly delivered to the PA power transistors. In this way, we will transmit interference through the antenna to the airwaves. The explanation is in the state 7:http://www.ok2kkw.com/qrm2vpz.htm

    I definitely recommend a classic transformer source with good stabilization. The cheaper ones are usable http://www.rmitaly.com/index.php/en/products/linear-power-supplies after adding a cooling fan.

    Forum Replies Created: N O R K O V V S A D E B O L #14619
    OM0AAO (OM0A)
    Participant

    Aktuálne som hospitalizovaný v nemocnici s obmedzeným prístupom k internetu, PSE QRL. Vybavím po prepustení z liečby.

    Forum Replies Created: Labor Prophet – headphones #14093
    OM0AAO (OM0A)
    Participant

    I agree, Once upon a time Jirko Ok5im recommended Koss SB-40 and are really good. The coloring of the sound is Hifi, but above all sitting well on my head and I don't feel after an hour, that I have to put them out of my head down

    http://om0a.cq.sk/?p=701

    Forum Replies Created: OM LOW POWER VHF CONTEST 2014 #14082
    OM0AAO (OM0A)
    Participant

    Po PD 😉

    Forum Replies Created: 80m + 40m antenna for the garden #14029
    OM0AAO (OM0A)
    Participant

    TNX Mirko, Martine… however, a half-wave dipole simply does not fit into 20x10m. He would only go in at an angle – center on the roof, arms towards the ground to the width of the garden 10m…

    The antenna should be part of the SO2R workplace, where the first has an excellent inv.V at 80m and GP 1/4 on a tin roof plus a tribander for the upper bands.

    This workplace will have a hexbeam for upper bands at a different height. The question is the two lower bands. I would consider it advantageous to have a different type of antennas at this workplace, but it is not a condition.

    W3DZZ in vertical version has half the height, approx. 16m. Another alternative is the two-band vertical DJ0IP http://www.dj0ip.de/vertical-antennas/80-40m-on-18m-pole/ The third alternative is two antennas, inv.L at 80m separately and inv.V at 40m under the hexbeam.

    Radials are currently winning it, are already being implemented, HI.

    Forum Replies Created: 80m + 40m antenna for the garden #14028
    OM0AAO (OM0A)
    Participant

    TNX Mirko, Martine… however, a half-wave dipole simply does not fit into 20x10m. He would only go in at an angle – center on the roof, arms towards the ground to the width of the garden 10m…

    The antenna should be part of the SO2R workplace, where the first has an excellent inv.V at 80m and GP 1/4 on a tin roof plus a tribander for the upper bands.

    This workplace will have a hexbeam for upper bands at a different height. The question is the two lower bands. I would consider it advantageous to have a different type of antennas at this workplace, but it is not a condition.

    W3DZZ in vertical version has half the height, approx. 16m. Another alternative is the two-band vertical DJ0IP http://www.dj0ip.de/vertical-antennas/80-40m-on-18m-pole/ The third alternative is two antennas, inv.L at 80m separately and inv.V at 40m under the hexbeam.

    Radials are currently winning it, are already being implemented, HI.

    Forum Replies Created: 80m + 40m antenna for the garden #14027
    OM0AAO (OM0A)
    Participant

    TNX Mirko, Martine… however, a half-wave dipole simply does not fit into 20x10m. He would only go in at an angle – center on the roof, arms towards the ground to the width of the garden 10m…

    The antenna should be part of the SO2R workplace, where the first has an excellent inv.V at 80m and GP 1/4 on a tin roof plus a tribander for the upper bands.

    This workplace will have a hexbeam for upper bands at a different height. The question is the two lower bands. I would consider it advantageous to have a different type of antennas at this workplace, but it is not a condition.

    W3DZZ in vertical version has half the height, approx. 16m. Another alternative is the two-band vertical DJ0IP http://www.dj0ip.de/vertical-antennas/80-40m-on-18m-pole/ The third alternative is two antennas, inv.L at 80m separately and inv.V at 40m under the hexbeam.

    Radials are currently winning it, are already being implemented, HI.

    Forum Replies Created: switching over the internet / GSM #14014
    OM0AAO (OM0A)
    Participant

    Can be done, I tried it when building a remote station…

    If you are building a remote station, are properties, which are absolutely important (and they are often forgotten). In my concept, it is also the ability to turn everything off at any time and from anywhere, because it helps to protect against static. At the same time, it is an emergency switch, if e.g. the transmitter remained broadcast in TX.

    If your internet goes out, DDNS server goes down, link na remote station, is the problem. It happens here sometimes, telephone lines are pulled through the air 🙄

    Therefore, I would rather use the Ethernet switch for something less important, e.g.. PA control

    First attempt remote station: http://om0a.cq.sk/?p=560
    Klient remote station: http://om0a.cq.sk/?p=587
    A sample of a different client configuration: http://om0a.cq.sk/?p=713

    Forum Replies Created: switching over the internet / GSM #14012
    OM0AAO (OM0A)
    Participant

    I use a GSM switched socket GS300 http://www.mikrovlny.cz/cz/produkt/11 . A plus is the wide possibility of configuration, feedback, temperature sensor, input for the sensor,… The disadvantage is of course the price.

    In the first phase of the remote station, I made a switch from an old Nokia. Disagreement or withdrawal of consent may adversely affect certain features and functions, but the switch made both the ringtone and the SMS.

    Ethernet switches are OK, of course, when connecting outside the local network, you need a fixed IP address.

    Forum Replies Created: Portable APRS digipeater / tracker s T3-Micro #13997
    OM0AAO (OM0A)
    Participant

    Very clever design!

    Forum Replies Created: Prenent solar spa 12v/7.2ah #13991
    OM0AAO (OM0A)
    Participant

    Very nice realization and usefulness for Ham radio!

Viewing 15 posts - 1 through 15 (of 204 total)