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Re: L5,L7 L4,L8 in MTR

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  • jonesr_99
    Jerry, Thanks for the info, it is greatly appreciated. I did peak the signals using a signal gen and an O scope. Ron W9RCJ
    Message 1 of 13 , Apr 19, 2013
      Jerry,

      Thanks for the info, it is greatly appreciated.
      I did peak the signals using a signal gen and an O scope.

      Ron
      W9RCJ

      --- In AT_Sprint@yahoogroups.com, "jgaffke" <jgaffke@...> wrote:
      >
      > Ron,
      >
      > Yup, I'm saying the schematic on page 22 is incorrect.
      > Of course, it was very late, and I've been wrong before.
      >
      > Builders that followed the build instructions and
      > made self consistent choices for Band1 and Band2
      > should be fine. It's OK if Band1 is 40 meters,
      > but most builders are making Band1 20 meters.
      >
      > If you followed the schematics while building (hey, you're
      > thinking too hard!!), you probably want to swap L7 with L8,
      > and L5 with L4.
      >
      > If you don't do that, you may have trouble getting the
      > receiver to peak on the desired signal. That might be
      > difficult to know since those trimmer caps have no stops
      > at min and max. What you might think is a proper peak
      > on 40 meters could turn out to simply be the trimmer cap
      > at its maximum value.
      >
      > I suggest you flip the switches to the 40 meter side, then
      > follow the traces to see which receive filter inductors
      > are connected in. If built correctly, the color code
      > should be brown,gray,black,gold for 18uH on those two
      > inductors. The 47k band select resistor for 40 meters
      > should also be selected by switch S5.
      >
      > On a related note, in message 10988 I suggest you add 100k
      > 0805 resistors over the top of any 47k band select resistor
      > for 40 meters and 100k over the top of any 22k band select
      > resistor for 30 meters. Those resistors are at R3 and R4.
      > Most builders are not having trouble with the MTR as kitted,
      > but some are. Especially those with other than the standard
      > 20/40 meter band selection.
      >
      > Jerry, KE7ER
      >
      > --- In AT_Sprint@yahoogroups.com, "jonesr_99" wrote:
      > > I built my MTR according to schematic on page 22,
      > > so you are saying this is incorrect? What problems
      > > will I have if this is incorrect? Ron W9RCJ
      >
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