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    S tou přílohou se asi něco nepovedlo.<br>
    Plánované kroky jsou:<br>
    1. Koukněte, tady máme krystalku, takhle nějak se to dělalo před 100
    a něco lety, ... bohužel to obnášelo i poněkud velkou anténu, jdeme
    vypustit balón.<br>
    2. Pak se začaly používat různé zesilovací prvky, ... dáme tam
    tranzistor a už stačí ta malá anténa co vede tady 10 m od okna.<br>
    3. Pak máme různé složitější konstrukce, které zesilují mnohem víc
    ... feritová anténa<br>
    4. Teď si zkusíme i jak před 100 lety vysílali, společně s dalšíma
    pokusama pro zájemce o elektronky.<br>
    <br>
    Poznámka: Nápad jenom nahradit nedostatečnou anténu vlastním
    vysílačem jsem zavrhnul, když mě napadlo použití balónu. Teď by se
    jenom hodil nějakej orientační výpočet, jak silnej signál z tý
    antény můžu očekávat.<br>
    <br>
    PH<br>
    <br>
    <div class="moz-cite-prefix">Dne 04.10.2023 v 8:47 Jan Kuba
      napsal(a):<br>
    </div>
    <blockquote type="cite"
cite="mid:CAD8qwROZrHXMa=qxA8TdciJhjU2X-d-8WtX64fNwGz6SCnjZoA@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      Schéma je v příloze... 
      <div>Ta GU5O je hezká, ale zase zbytečná komplikace. Ten
        tranzistor dá stejný výkon a bez dalších komplikací s
        napájením... <br>
        <br>
        úterý 3. října 2023 Pavel Hudeček <<a
          href="mailto:edizon@seznam.cz" moz-do-not-send="true"
          class="moz-txt-link-freetext">edizon@seznam.cz</a>>
        napsal(a):<br>
        <blockquote class="gmail_quote" style="margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">
          <div> O tom jsem uvažoval taky, ale po zkušenostech s "radami"
            jak strašlivé zlo je vysílač na 100 MHz o výkonu pár mW jsem
            se neodvážil zmínit:-)<br>
            <br>
            Ale jestli teda najednou jo a hned i s PA, tak co se týče
            replikace historických věcí, mám i nějaké elektronky, z nich
            asi nejlepší pro SV by mohla bejt GU50. Zapojilo by se to
            podle nějaké historické knížky, které mi tam leží.<br>
            <br>
            U toho článku o PA mě zaujala zmínka, že ty IRF.. jsou
            V-MOS. To jsem myslel, že se používá jen ve speciálních
            případech a od obyčejných IRF bych čekal, že jsou to
            obyčejné laterální MOSFETy. Jak to teda je?<br>
            Jo a taky asi nějak blbě koukám, že nemůžu najít schéma.<br>
            <br>
            PH<br>
            <br>
            <div>Dne 03.10.2023 v 22:46 Jan Kuba napsal(a):<br>
            </div>
            <blockquote type="cite">
              <div dir="ltr">Jo a vůbec bych se nebál to posílit někam
                na 10 - 30W nějakým obyčejným IRF530...
                <div><a href="https://cq.sk/cs/lacny-kv-pa-s-irf530/"
                    target="_blank" moz-do-not-send="true">https://cq.sk/cs/lacny-kv-pa-<wbr>s-irf530/</a></div>
                <div>Ono vyzářit na takovém kmitočtu jenom zlomek toho
                  výkonu není až tak jednoduché, pokud je krátká anténa.<br>
                  <div><br>
                    <table style="border-top:1px solid #d3d4de">
                      <tbody>
                        <tr>
                          <td style="width:55px;padding-top:13px"><a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail"
                              target="_blank" moz-do-not-send="true"><img
src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif"
                                alt="" style="width:46px;height:29px"
                                moz-do-not-send="true" width="46"
                                height="29"></a></td>
                          <td
style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Neobsahuje
                            žádné viry.<a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail"
                              style="color:#4453ea" target="_blank"
                              moz-do-not-send="true">www.avast.com</a></td>
                        </tr>
                      </tbody>
                    </table>
                  </div>
                  <br>
                  <div class="gmail_quote">
                    <div dir="ltr" class="gmail_attr">út 3. 10. 2023
                      v 22:34 odesílatel Jan Kuba <<a
                        href="mailto:honza.kuba@gmail.com"
                        target="_blank" moz-do-not-send="true"
                        class="moz-txt-link-freetext">honza.kuba@gmail.com</a>>
                      napsal:<br>
                    </div>
                    <blockquote class="gmail_quote" style="margin:0px
                      0px 0px 0.8ex;border-left:1px solid
                      rgb(204,204,204);padding-left:1ex">
                      <div dir="ltr">Ještě je tu jednodušší varianta
                        krystalky "bez vodíku"
                        <div><a
                            href="https://ok1if.hamqth.com/Pellmell21/Projekt%20Krystalka.html"
                            target="_blank" moz-do-not-send="true">https://ok1if.hamqth.com/<wbr>Pellmell21/Projekt%<wbr>20Krystalka.html</a><br>
                        </div>
                        <div>Myslí, že je to správná cesta jak to dětem
                          přiblížit.</div>
                        <div>Když to podmalujete ještě tou správnou
                          atmosférou, že je to pirátské vysílání,</div>
                        <div>zážitek bude lepší než anténa na balónu.</div>
                        <div>Mimochodem ta stejně nefunguje, neboť vítr
                          to unáší a je z toho horizontální
                          anténa...která se připlete někde do vedení.</div>
                        <div>Někde na webu je krásný popis, jak to někdo
                          realizoval a pak volali ČEZ, aby vyměnil
                          pojistky v trafostanici.</div>
                      </div>
                      <div><br>
                        <table style="border-top:1px solid
                          rgb(211,212,222)">
                          <tbody>
                            <tr>
                              <td style="width:55px;padding-top:13px"><a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail"
                                  target="_blank" moz-do-not-send="true"><img
src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif"
                                    alt=""
                                    style="width:46px;height:29px"
                                    moz-do-not-send="true" width="46"
                                    height="29"></a></td>
                              <td
style="width:470px;padding-top:12px;color:rgb(65,66,78);font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Neobsahuje
                                žádné viry.<a
href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail"
                                  style="color:rgb(68,83,234)"
                                  target="_blank" moz-do-not-send="true">www.avast.com</a></td>
                            </tr>
                          </tbody>
                        </table>
                      </div>
                      <br>
                      <div class="gmail_quote">
                        <div dir="ltr" class="gmail_attr">út 3. 10. 2023
                          v 20:54 odesílatel Pavel Hudeček <<a
                            href="mailto:edizon@seznam.cz"
                            target="_blank" moz-do-not-send="true"
                            class="moz-txt-link-freetext">edizon@seznam.cz</a>>
                          napsal:<br>
                        </div>
                        <blockquote class="gmail_quote"
                          style="margin:0px 0px 0px
                          0.8ex;border-left:1px solid
                          rgb(204,204,204);padding-left:1ex">
                          <div> Bylo by to jednoduché, kdybych měl
                            vlastní nádobu vhodných parametrů, byl
                            vybaven na přepouštění plynů a lahev od
                            dodavatele a zpět by šla poslat Zásilkovnou,
                            nebo dodavatel měl prodejnu za rohem.
                            Jelikož není splněna žádná z podmínek, je
                            tato varianta zbytečně nákladná.<br>
                            <br>
                            Elektrolyzér naopak potřebuju i na jiné
                            pokusy, kde je vyžadována směs, nejlépe
                            přesně taková, co z něj přirozeně leze a
                            všechny komponenty se dají koupit bez
                            komplikací s dopravou.<br>
                            <br>
                            PH<br>
                            <br>
                            <div>Dne 03.10.2023 v 17:20 Jan Kuba
                              napsal(a):<br>
                            </div>
                            <blockquote type="cite"> Už to tu někdo
                              psal, nebylo by mnohem jednodušší si
                              koupit tu flašku s nejšpinavějším
                              vodíkem? 
                              <div>Nebo si dojet k pumpě v Neratovicích
                                a natlačit si ho do svý flašky?
                                Samozřejmě vybaven příslušnou redukcí z
                                pistole...? <br>
                                <div><br>
                                  úterý 3. října 2023 Pavel Hudeček <<a
                                    href="mailto:edizon@seznam.cz"
                                    target="_blank"
                                    moz-do-not-send="true"
                                    class="moz-txt-link-freetext">edizon@seznam.cz</a>>
                                  napsal(a):<br>
                                  <blockquote class="gmail_quote"
                                    style="margin:0px 0px 0px
                                    0.8ex;border-left:1px solid
                                    rgb(204,204,204);padding-left:1ex">
                                    <div> Hoffmanův přístroj je školní
                                      demonstrační přístroj s naprosto
                                      nevhodným poměrem průřezu
                                      elektrolytu a vzdálenosti
                                      elektrod. Nevhodný pro získávání
                                      větších objemů. Na ty se hodí
                                      deskové, nejlépe vícečlánkové
                                      konstrukce. Bohužel je u nich zas
                                      složitější separace plynů.<br>
                                      <br>
                                      Mám takový malinký, krabička asi
                                      100 ml a udělá s 3A zdrojem litr
                                      směsi H2+O2 za několik minut.
                                      Chystám se udělat větší, protože
                                      tenhle je limitován malým objemem
                                      roztoku (desítky ml) a špatným
                                      odvodem tepla. Takže naplní třeba
                                      20litrovou PETku od vody, ale 50l
                                      barel už ne. Navíc po několika
                                      incidentech s přehřátím už špatně
                                      těsní. Novej bude z 0,5l krabičky
                                      na jídlo a dostane ještě víc
                                      článků, aby to bylo tak na 24-30
                                      V.<br>
                                      <br>
                                      Zajímavá otázka je, jestli můžu
                                      vnitřní nosnou konstrukci
                                      vytisknout z PETG, zda dlouhodobě
                                      (roky) vydrží působení (občas
                                      horkého) NaOH.<br>
                                      <br>
                                      Je fakt, že použití nového
                                      elektrolyzéru by byla dobrá
                                      alternativa na ten balón. Pak by
                                      to ale chtělo upgradovat víc, aby
                                      uvnitř bylo aspoň 500 ml roztoku.
                                      Nosnost H2+O2 je o třetinu horší a
                                      spotřeba vody je něco pod ml/l.<br>
                                      <br>
                                      PH<br>
                                      <br>
                                      <div>Dne 02.10.2023 v 20:29 <a
                                          href="mailto:ahorna@seznam.cz"
                                          target="_blank"
                                          moz-do-not-send="true"
                                          class="moz-txt-link-freetext">ahorna@seznam.cz</a>
                                        napsal(a):<br>
                                      </div>
                                      <blockquote type="cite"> Dobrý
                                        den,
                                        <div><br>
                                        </div>
                                        <div>kyselina solná železo
                                          rozpouští, možná to jen půjde
                                          pomaleji než v případě zinku.
                                          S hliníkem reaguje také, ale
                                          hlavně zpočátku to trvá,
                                          protože je přirozeně
                                          zapasivovaný oxidem hlinitým.</div>
                                        <div><br>
                                        </div>
                                        <div>Další možností je použití
                                          hydroxidu sodného nebo
                                          draselného s hliníkem nebo
                                          zinkem, jak už bylo uvedeno.
                                          Nevím už kde, ale na netu
                                          někdo vzpomínal na vodíkový
                                          balón, možná právě kvůli
                                          anténě, který vypouštěl jako
                                          kluk někdy za socialismu. Při
                                          prvních pokusech se mu v hrdle
                                          nádoby s HCl a Zn/Al něco
                                          zaseklo a nastal výbuch a on
                                          skončil s prožranou bundou,
                                          takže později používal už jen
                                          hydroxid s hliníkem.</div>
                                        <div><br>
                                        </div>
                                        <div>Při elektrolýze by se mohl
                                          uplatnit vodný roztok kyseliny
                                          sírové, elektrolýzou se
                                          kyselina koncentruje, stačí
                                          doplňovat vodu, viz Hoffmanův
                                          přístroj.</div>
                                        <div><br>
                                        </div>
                                        <div>S pozdravem</div>
                                        <div>Aleš Horna</div>
                                        <div><br>
                                          ---------- Původní e-mail
                                          ----------<br>
                                          Od: Vláďa Anděl <a
                                            href="mailto:vaelektronik@vaelektronik.cz"
                                            target="_blank"
                                            moz-do-not-send="true"><vaelektronik@vaelektronik.cz></a><br>
                                          Komu: <a
                                            href="mailto:hw-list@list.hw.cz"
                                            target="_blank"
                                            moz-do-not-send="true"
                                            class="moz-txt-link-freetext">hw-list@list.hw.cz</a><br>
                                          Datum: 01.10.2023 20:45:22<br>
                                          Předmět: Re: OT: countryradio
                                          na 639 KHz<br>
                                          <br>
                                          <blockquote><br>
                                            <div>Nebude nakonec ten
                                              signál u vás ještě<br>
                                              lepší, než ze Zbraslavi?
                                              pro 639 KHz vychází 3/4
                                              lambda 352m a ty<br>
                                              stožáry mají 355m. Nejsem
                                              sice odborník na antény,
                                              ale mám takové<br>
                                              tušení, že 3/4 lambda
                                              soustředí signál víc do
                                              vodorovné roviny.<br>
                                              Nevím sice o kolik, ale
                                              něco to určitě přidá. Pak
                                              ty stožáry jsou<br>
                                              dva, takže můžou čarovat
                                              se směrovou
                                              charakteristikou. Mám
                                              dojem,<br>
                                              že prvotní záměr byl, aby
                                              to bylo slyšet i na
                                              Slovensku. Což po<br>
                                              oddělení Slovenska padlo.</div>
                                            <br>
                                            <div><br>
                                              <br>
                                            </div>
                                            <br>
                                            <div>Ohledně toho vodíku -
                                              žere vůbec<br>
                                              kyselina solná železo?
                                              Zinek jo a mám dojem, že i
                                              hliník. Spíš<br>
                                              bych se zaměřil na
                                              elektrolýzu vody. Ale tam
                                              je potřeba oddělit<br>
                                              kladnou a zápornou stranu
                                              tak, aby to pro ionty bylo
                                              prostupné a<br>
                                              nesmíchal se kyslík s
                                              vodíkem. Ale když to
                                              zvládli Němci při<br>
                                              plnění vzducholodí, tak to
                                              snad takový hi tech
                                              nebude.</div>
                                            <br>
                                            <div><br>
                                              <br>
                                            </div>
                                            <br>
                                            <div>Anděl</div>
                                            <br>
                                            <div><br>
                                              <br>
                                            </div>
                                            <br>
                                            <div>Dne 01.10.2023 v 14:10
                                              Pavel Hudeček<br>
                                              napsal(a):<br>
                                              <br>
                                            </div>
                                            <br>
                                            <blockquote><br>
                                              <br>
                                              Školní rok zase začal a mě
                                              zase chybí možnost ukázat
                                              dětem na<br>
                                              kroužku krystalku.<br>
                                              <br>
                                              Liblice jsou dál než
                                              Zbraslav, ERP stejný, to
                                              teda nic moc.<br>
                                              <br>
                                              Liblice: 35,7 km - východ<br>
                                              <br>
                                              Zbraslav: 18,1 km - jih<br>
                                              <br>
                                              <br>
                                              <br>
                                              Ale zrovna před pár dny mě
                                              napadlo zajímavé řešení:<br>
                                              <br>
                                              Místo komplikací s trvale
                                              umístěnou horizontální
                                              anténou, která je<br>
                                              potřeba 1 za rok si jednou
                                              za rok udělat anténu na
                                              jedno použití<br>
                                              ... a to za použití
                                              balónu.<br>
                                              <br>
                                              <br>
                                              <br>
                                              1 mol vodíku má 1 gram a
                                              objem 11,23 litru.<br>
                                              <br>
                                              1 mol železa má asi 55
                                              gramů a v podobě drobných
                                              hřebíčků je v<br>
                                              železářství levný<br>
                                              <br>
                                              1 mol HCl má asi 36 gramů
                                              a shodou okolností se
                                              prodává v<br>
                                              koncentraci číselně
                                              podobné, takže cca 100 g,
                                              což je taky v<br>
                                              drogerii za pakatel.<br>
                                              <br>
                                              <br>
                                              <br>
                                              Vzduch má 1,25 g/l, vodík
                                              98 mg, takže jeho nosnost
                                              je asi 1,15<br>
                                              g/litr.<br>
                                              <br>
                                              <br>
                                              <br>
                                              Zajímavá otázka je, kolik
                                              váží nejlehčí běžně
                                              prodávaný 120l pytel<br>
                                              na odpadky<br>
                                              <br>
                                              a druhá, kolik váží 100 m
                                              balíček nejtenčího
                                              neizolovaného<br>
                                              vázacího drátu.<br>
                                              <br>
                                              <br>
                                              <br>
                                              Ale i kdyby tohle
                                              "instantní" řešení
                                              nevyšlo, dá se vzít třeba<br>
                                              pruh myllaru 2,4x0,6 m,
                                              dvě kolečka o obvodu 2,4
                                              m, 6 m izolepy a<br>
                                              je poněkud neforemný balón
                                              o objemu přes 200 litrů.<br>
                                              <br>
                                              <br>
                                              <br>
                                              To by znamenalo 20 molů
                                              vodíku a tedy i
                                              ingrediencí, tzn. kilo<br>
                                              hřebíčků a dva litry
                                              kyseliny, což není zas tak
                                              hrozné. Drogerie i<br>
                                              železářství mám při cestě
                                              a celé se to vejde do
                                              košíku na<br>
                                              koloběžce:-)<br>
                                              <br>
                                              <br>
                                              <br>
                                              Vodík je samozřejmě trochu
                                              nebezpečný, ale není
                                              problém, aby od<br>
                                              začátku až po uvolnění
                                              odvíjení u toho nikdo
                                              nebyl a na závěr se<br>
                                              provede dálkově ovládaná
                                              autodestrukce:-)<br>
                                              <br>
                                              <br>
                                              <br>
                                              Otázky:<br>
                                              <br>
                                              1. Lze nějak odhadnout,
                                              jaký výkon poleze ze 100 m
                                              vertikální<br>
                                              antény v lokalitě Praha 6
                                              Podbaba?<br>
                                              <br>
                                              Poznámka: Prakticky bude
                                              anténa vyčnívat jen pár
                                              desítek m nad<br>
                                              úroveň "hřebene"
                                              Hanspaulka-Matěj-Baba. Ten
                                              je v podstatě<br>
                                              rovnoběžný se směrem na
                                              Zbraslav a kolmý ke směru
                                              na Liblice, což<br>
                                              by zase pro ty Liblice
                                              byla asi výhoda.<br>
                                              <br>
                                              2. Nějaké tipy na levné
                                              železné, či zinkové
                                              piliny, nebo jiný kov<br>
                                              dobře žratelný HCl? Nebo
                                              jiný levný zdroj vodíku?<br>
                                              <br>
                                              3. Nějaké tipy na dlouhý a
                                              lehký drát vhodný pro daný
                                              účel?<br>
                                              <br>
                                              4. Nějaké další poznámky k
                                              tomuto plánu na
                                              jednorázovou anténu?<br>
                                              <br>
                                              <br>
                                              <br>
                                              Díky,<br>
                                              <br>
                                              PH<br>
                                              <br>
                                              <br>
                                              <br>
                                              <div>Dne 01.10.2023 v 9:19
                                                Vláďa Anděl<br>
                                                napsal(a):<br>
                                                <br>
                                              </div>
                                              <br>
                                              <blockquote><br>
                                                <br>
                                                <p><font face="Times New
                                                    Roman">Zaznamenal
                                                    jsem, že se našlo<br>
                                                    využití pro náš
                                                    největší AM vysílač
                                                    (stožáry mají výšku
                                                    355<br>
                                                    m), který už chtěli
                                                    bourat. <br>
                                                    <br>
                                                  </font></p>
                                                <br>
                                                <p><font face="Times New
                                                    Roman"><a
                                                      href="https://www.oviradio.cz/stredni-vlny-praha/"
                                                      target="_blank"
                                                      moz-do-not-send="true">https://www.oviradio.cz/<wbr>stredni-vlny-praha/</a></font></p>
                                                <br>
                                                <p><font face="Times New
                                                    Roman">Sice mají jen
                                                    20 KW a ten<br>
                                                    vysílač měl v době
                                                    své největší slávy
                                                    1,5 MW, ale aspoň
                                                    mají<br>
                                                    konečně pořádný
                                                    kmitočet a nebudou
                                                    muset na noc
                                                    snižovat<br>
                                                    výkon. Co jsem tak
                                                    hledal, střední vlny
                                                    zase postupně<br>
                                                    ožívají, nejvíc
                                                    vysílačů snad má
                                                    rádio dechovka.
                                                    Někde z<br>
                                                    Budějovic se snad
                                                    dokonce vysílá v
                                                    DRM. Kdyby
                                                    countryradio z<br>
                                                    Liblice vysílalo v
                                                    DRM, myslím že by v
                                                    pohodě pokrylo celé</font></p>
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