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561lpftr [2016/06/08 13:08] n1eu created |
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| + | ====== Corsair II - Troubleshooting Weak Receive on higher bands ====== | ||
| + | **From the Ten-Tec Reflector June 8, 2016** | ||
| The problem typically presents with these symptoms, as Marco IS0KYB described: | The problem typically presents with these symptoms, as Marco IS0KYB described: | ||
| - | "on some bands (mostly from 15m upwards) I noticed a weak reception when I use the main antenna input. The problem goes away if I switch to the RX antenna. | + | On some bands (mostly from 15m upwards) I noticed a weak reception when I use the main antenna input. The problem goes away if I switch to the RX antenna. |
| No, it doesn't seem to be the RX ant switch :) I cleaned it and operated it 100 times... it doesn't even scratch. | No, it doesn't seem to be the RX ant switch :) I cleaned it and operated it 100 times... it doesn't even scratch. | ||
| - | I believe that the culprit is a faulty switching diode among D1-D6 in the rx/tx switch." | + | I believe that the culprit is a faulty switching diode among D1-D6 in the rx/tx switch. |
| Rick VE3ORY responded to Marco's post: | Rick VE3ORY responded to Marco's post: | ||
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| Like Marco I suspected the problem to be diodes related to T/R | Like Marco I suspected the problem to be diodes related to T/R | ||
| switching, however the problem turned out to be in the High Pass Filter | switching, however the problem turned out to be in the High Pass Filter | ||
| Line 53: | Line 54: | ||
| 3. R6 had been changed from 150 ohms to a 47ohm resistor. | 3. R6 had been changed from 150 ohms to a 47ohm resistor. | ||
| + | {{:565lpf-tr.jpg?1000}} | ||
