The Ensemble II HF Rx has 4 "superbands" implemented as 4 bandpass
filters that are switched in and out the antenna signal path to the
quadrature mixer.? The filters switching points are, by design:
- Superband 0: 0 -? 4 MHz
- Superband 1: 4 -? 8 MHz
- Superband 2: 8 - 16 MHz
- Superband 3:16 -? ¡Þ MHz
They are switched automatically by the ATtiny? 85 microcontroller
. The switching points can be changed? but not recommended,
invoking the configuration utility clicking on ExtIO button,? ABPF
tab.? Be sure that the Enable Filter box is ticked, if not it
could give the symptoms that you have.
If the configuration is ok, then there is a problem with the
filters for the 2 upper bands, either there is a problem with a
coil solder or the IC switches are not working, it can be caused
by a bad solder, a bad switch or an bad optoisolator.? If you are
comfortable using a voltmenter you can measure the continuity of
the signal path through the coils and check the signals that drive
the switches.
Regards,
Ignacio EB4APL
On 04/04/2014 2:05,
tng5737@... wrote:
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?
I recently purchased an assembled ensemble II HF Rx.?? It
seems to function below 10Mhz but not at all above that.?
In other words, anything above 40m.? I have tried both a
Hustler 6BTV and a general discone and get the same
results.? Has anyone else seen this problem?
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