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Yaesu FR-DX400 (= Sommerkamp FR-DX500)
I recently got the subject receiver in good conditions. I have =
re-checked everything (including tubes) and accurately tuned it. It works very well on all band up to 20 meters. On 15 meter and 10 = meters it works fine, but it is comparatively less sensitive. When = tuning trimmers and coils one can see a clear signal peak, so it does = not seem to be a problem bound to a resonating circuit off resonance. I measured that the signal injected by the conversion crystal oscillator = into the first mixer gets much lower on the higher frequency bands, but = I do not suspect a bad crystal as the problem is the same for the = 15-meter band and the four 10-meter segments. Could it be just a design problem? I wonder whether someone had a similar experience with that receiver. 73 Tony, I0JX |
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