Loading ...
Sorry, an error occurred while loading the content.

Re: T2-301 Power Supply Voltage Tolerance

Expand Messages
  • k7ybz
    All the info you need is here: https://www.argentdata.com/catalog/product_info.php?products_id=110 or here:
    Message 1 of 7 , Aug 29, 2011
    • 0 Attachment
      All the info you need is here:

      https://www.argentdata.com/catalog/product_info.php?products_id=110
      or here:
      https://www.argentdata.com/catalog/product_info.php?cPath=22&products_id=112&osCsid=613b8d16fc0cb210f695835b0b986f95


      Larry
      K7YBZ

      --- In tracker2@yahoogroups.com, "seerdman" <seerdman@...> wrote:
      >
      > Great advice and a great reminder to consult the FC-301 manual as part of the overall documentation for the T2-301. Thank you!
      >
      > --- In tracker2@yahoogroups.com, "zl1vfo" <zl1vfo@> wrote:
      > >
      > >
      > >
      > >
      > >
      > > --- In tracker2@yahoogroups.com, "seerdman" <seerdman@> wrote:
      > > >
      > > > I want to set up my commuting bicycle for APRS and use a rechargeable battery, and of course spend as little $ as possible. :o)
      > > >
      > > > I have a couple of 14.4V DeWalt power tool rechargeable batteries laying around that I can adapt for this purpose, but at full recharge, they read 16.3V unloaded and the T2-301 is spec'd at 15V.
      > > >
      > > > The question is - is there a safe way to know or predict what the battery's voltage may drop to when loaded with the T2-301, or should I really add a diode in series to drop the supply ~1V? Not a big deal to add the diode, but then wouldn't I always be losing a little kick on the TX power level?
      > > >
      > > > Steve, KF7MXS
      > > >
      > >
      > >
      > > Looking at the schematic for the T2 part, it would handle the extra voltage OK, although the radio side may not appreciate it. The manual says 12V nominal, meaning 12V, so 16 volts may cause damage to the RF output stage, at a guess. It's usually the high stress bits which are likely to pop first.
      > > As the batteries that you have are designed to supply a cordless drill, which tend to suck oodles of current (like 10 - 30 Amps under heavy load for some I've measured) , I don't think that the 1.5 Amps on transmit for the T2-301 is going to dent the supply voltage much.
      > >
      > > So yes, it'll probably be a good idea to reduce a bit with a pair of diodes in series, or alternatively, some form of "Pre-regulator" - perhaps a 2 Amp, 15V, LDO version.
      > > Alternatively, you could remove a cell from the battery pack and link out the gap, although what the battery charger would think of this is unknown - depends on what type of charger it is, and what it's expecting.
      > >
      > > 73,
      > > Ian ZL1VFO
      > >
      >
    Your message has been successfully submitted and would be delivered to recipients shortly.