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516tcxo [2007/04/09 22:18] n5na created |
516tcxo [2007/04/09 22:20] n5na |
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| **From the Ten-Tec Reflector March 7, 2003** | **From the Ten-Tec Reflector March 7, 2003** | ||
| - | This morning, I decided to attempt a TCXO alignment on the ArgoV....it's a very simple and straightforward process. Please review | + | This morning, I decided to attempt a TCXO alignment on the ArgoV....it's a very simple and straightforward process. Please review these instructions in their entirety prior to proceeding with the first step below. |
| - | these instructions in their entirety prior to proceeding with the first step below. | + | |
| -Remove the 5 Phillips-head screws from the case (one on top, four on the sides). DO NOT remove the cover at this time. | -Remove the 5 Phillips-head screws from the case (one on top, four on the sides). DO NOT remove the cover at this time. | ||
| - | -Power-up the Argo V and let it warm-up for one or two hours. While you're waiting for the unit to warm-up, locate a small | + | -Power-up the Argo V and let it warm-up for one or two hours. While you're waiting for the unit to warm-up, locate a small jeweler's screwdriver and have it handy. |
| - | jeweler's screwdriver and have it handy. | + | -While you're waiting for the warm-up, tune to WWV at 15 or 20 MHz. Try to use 20 MHz for best accuracy at all lower frequencies. If you can't get a decent 20 MHz signal, use WWV at 15 MHz. |
| - | -While you're waiting for the warm-up, tune to WWV at 15 or 20 MHz. Try to use 20 MHz for best accuracy at all lower frequencies. | + | -Also while waiting, go to the CW mode, and menu though the front panel keyer button until the side-tone becomes audible. You should now hear WWV beating against the Argo's internal CW side-tone. You may leave it this way during warm-up. |
| - | If you can't get a decent 20 MHz signal, use WWV at 15 MHz. | + | |
| - | -Also while waiting, go to the CW mode, and menu though the front panel keyer button until the side-tone becomes audible. You | + | |
| - | should now hear WWV beating against the Argo's internal CW side-tone. You may leave it this way during warm-up. | + | |
| -After the warm-up period, remove the top case cover. You should have removed the top cover screws in Step 1. | -After the warm-up period, remove the top case cover. You should have removed the top cover screws in Step 1. | ||
| - | -The TCXO module is immediately recognizable as a rectangular silver metal can on the top circuit board. It is located near the | + | -The TCXO module is immediately recognizable as a rectangular silver metal can on the top circuit board. It is located near the center of the circuit board...just a bit to the right. The TCXO is designated as U9. |
| - | center of the circuit board...just a bit to the right. The TCXO is designated as U9. | + | |
| -You'll see a small straight-blade screw-adjustable capacitor visible through the TCXO's metal case. | -You'll see a small straight-blade screw-adjustable capacitor visible through the TCXO's metal case. | ||
| - | -Adjust the TCXO's capacitor in small increments with a jeweler's screwdriver until you have attained "zero-beat" against the | + | -Adjust the TCXO's capacitor in small increments with a jeweler's screwdriver until you have attained "zero-beat" against the sidetone oscillator. __Note: the capacitor's stator appears to be at ground potential and there's no need for an insulated screwdriver. As the screwdriver is removed, zero-beat should not change.__ |
| - | sidetone oscillator. * Note: the capacitor's stator appears to be at ground potential and there's no need for an insulated | + | |
| - | screwdriver. As the screwdriver is removed, zero-beat should not change. * | + | |
| -Replace the top cover using its 5 screws that were removed in Step 1. | -Replace the top cover using its 5 screws that were removed in Step 1. | ||
