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Sunday, February 5

  1. page PImp edited ... Therefore I have taken power from two connections, one from battery (this powering point is ac…
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    Therefore I have taken power from two connections, one from battery (this powering point is actually connected on the connection of orange-red wires explained below) and another powering point is near connector of external DC in (electronically connected directly to +-wire of DC-connector). These connection points are isolated from each others with two diodes. Also two 3A fuses are on powering lines before regulator.
    I use 12V to 5V "buck-converter". Generally linear regulator cause less trouble with radio interference, but are wasting power. I use cheap "JTRON" regulator, stated as 3A max output power and cost about 6 euro at dx.com. Yet I have not find any trouble with interferences. Will report more later when I get more experience.
    ...
    remote desktop. There is no isolation between soundcard and "Data in" connector on rig, just bare wires.
    Modification to release battery switch to be used as power switch for Pi
    Yaesu FT-897 have room for two battery to be installed in "stomach". After installation of Pi, there is room left only for one internal battery inside FT-897. It is natural approach to use battery select switch as power switch for Pi.
    (view changes)
    10:18 am
  2. page PImp edited ... Connecting regulator to input power of FT-897 FT-897 have internal relay which selects if pow…
    ...
    Connecting regulator to input power of FT-897
    FT-897 have internal relay which selects if power is taken from battery or from external DC connector. It of course shuts battery power off is external power is available. We could take power for regulator after that relay, but problem would be that Pi would not turn on with battery power if rig is off.
    ...
    diodes. Also totwo 3A fuses
    I use 12V to 5V "buck-converter". Generally linear regulator cause less trouble with radio interference, but are wasting power. I use cheap "JTRON" regulator, stated as 3A max output power and cost about 6 euro at dx.com. Yet I have not find any trouble with interferences. Will report more later when I get more experience.
    Also I have not saw interference from Pi itself. I bet key factor is that there is not much wires connected to Pi, but it is used via remote desktop. There is no isolation between soundcard and "Data in" connector on rig, just bare wires.
    (view changes)
    10:12 am
  3. page PImp edited ... Connecting regulator to input power of FT-897 FT-897 have internal relay which selects if pow…
    ...
    Connecting regulator to input power of FT-897
    FT-897 have internal relay which selects if power is taken from battery or from external DC connector. It of course shuts battery power off is external power is available. We could take power for regulator after that relay, but problem would be that Pi would not turn on with battery power if rig is off.
    ...
    power from totwo connections, one
    I use 12V to 5V "buck-converter". Generally linear regulator cause less trouble with radio interference, but are wasting power. I use cheap "JTRON" regulator, stated as 3A max output power and cost about 6 euro at dx.com. Yet I have not find any trouble with interferences. Will report more later when I get more experience.
    Also I have not saw interference from Pi itself. I bet key factor is that there is not much wires connected to Pi, but it is used via remote desktop. There is no isolation between soundcard and "Data in" connector on rig, just bare wires.
    (view changes)
    10:11 am

Monday, January 30

  1. page PImp edited ... It seems red charge indicator led on FT-897 will illuminate when battery back sends +5 V signa…
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    It seems red charge indicator led on FT-897 will illuminate when battery back sends +5 V signal on middle terminal on battery connector. This led is also independent of power state of rig, it will turn on regardless if rig is on or off. Therefore it is suitable for this use. Pi is powered with +5 V so you only have to connect same power to this middle terminal on battery connector (battery "B" connector on my case). I actually put 1k resistor here, because I think led is quite brigth and why waste power.
    It seems green led could be used also, drawback is it depends of power state of rig, In other words, if rig is off, led stays off too. For me red led is anyway better, because it is warning. Pi can start transmission anytime it is on, so warning red light makes sense.
    Connection between sound card and Yaesy
    Connection is really simple. This is data-connector of Yaesu. Picture is from user's manual:
    {FT897dataConnectgor.png}
    And this look like sound card dongle I use with Pi. (Only I have removed case to save space).
    {usb-sound-card.jpg}
    .
    I have connected output from sound card (marked with little headphone symbol in sound card case) to "data in" pin throw capacitor. Capacitor value is not critical, I used o.1 uF if I remember right. (But do not use electrolytic capacitor) I have soldered connections directly to pc-board of dongle, but you can use jack connector also. Jack connector is of course stereo output. Just connect left or right to capacitor, and choose the working one on software side, whatever you use.
    {Interface2.png}
    I have used this also without capacitor, but I suspect it caused signal degrading on long transmission, perhaps some dc-buildup.
    Sound card "mic" input is connected to "Data out 1200 Bps" pin on Yaesu. It is only wire, nothing else.
    Also you need to connect ground of sound card audio connectors and Yaesu data connector ("GND") together.
    On Yaesu side of cable, I took connector jack from old keyboard.
    One more hint: you have to use "digital VOX" on Yaesu, not the one meant for microphone. Read user manual carefully. I bet it is done with Google translator :D It is not very clear about VOX settings or is it just my English skills...?

    (view changes)
    12:18 am

Sunday, January 29

  1. file Interface2.png uploaded
    11:57 pm
  2. file Interface.png uploaded
    11:56 pm
  3. file Interface.png uploaded
    11:54 pm
  4. 11:41 pm
  5. 11:36 pm

Friday, December 16

  1. page GeegyLittle Machine edited ... This is currently at early stage. Here it transmits some THOR, with function described at THOR…
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    This is currently at early stage. Here it transmits some THOR, with function described at THOR from AD9850. Exactly same function works here and on General Learning Machine.
    Next generation:
    ...
    better usability outdoors,outd
    {someIdeas} oors,
    and lower
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    working really bad...badly... I kind
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    explains my feelings.Currentlyfeelings.
    Currently
    this is
    ...
    still protohack.
    {someIdeas}

    What I really want to do, is a pair for GLM: GLM working as base station and this on field. Maybe some day. When writing this, GLM is under total rebuilding, I think it is third time now rebuilding GLM. So that one day will not come soon.
    As you may quess, this have something to do wit KISSB.

    (view changes)
    3:36 am

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