Re: L5,L7 L4,L8 in MTR
Thanks for the info, it is greatly appreciated.
I did peak the signals using a signal gen and an O scope.
--- In AT_Sprint@yahoogroups.com, "jgaffke" <jgaffke@...> wrote:
> 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