Differences
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1254pbigelow [2007/03/27 16:46] n5na |
1254pbigelow [2007/03/27 16:48] n5na |
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| **Quirks noted and possible remedies:** | **Quirks noted and possible remedies:** | ||
| - | - Lots of birdies and display induced signals on the lower half of the AM broadcast band. | + | * Lots of birdies and display induced signals on the lower half of the AM broadcast band. |
| - | * Remedy: Have attempted to shield out the multiplexing emissions by spray painting a graphite EMI/RF shield to the inside of the front cover. It helped a little bit. | + | *Remedy: Have attempted to shield out the multiplexing emissions by spray painting a graphite EMI/RF shield to the inside of the front cover. It helped a little bit. |
| - | - Reduced sensitivity on the lower half of the AM broadcast band. | + | * Reduced sensitivity on the lower half of the AM broadcast band. |
| - | * Remedy: Put a jumper across R72, eliminating that input filter. | + | *Remedy: Put a jumper across R72, eliminating that input filter. |
| - | - FM intermod from strong FM stations. Just add 90 (2* 1st IF) to the received frequency | + | * FM intermod from strong FM stations. Just add 90 (2* 1st IF) to the received frequency |
| to detetmine offending frequency. | to detetmine offending frequency. | ||
| Line 39: | Line 39: | ||
| * Incorporated FM trap (from Radio Shack) in the antenna lead. | * Incorporated FM trap (from Radio Shack) in the antenna lead. | ||
| - | - The rotary Encoder loosens up with use causing the frequencies to jump around (sometimes) when tuning from one step to another. | + | * The rotary Encoder loosens up with use causing the frequencies to jump around (sometimes) when tuning from one step to another. |
| * Possible Remedy (have not tried yet): Sandwiching a large, black, felt washer between the tuning knob and the tuning knob recess to reduce play. | * Possible Remedy (have not tried yet): Sandwiching a large, black, felt washer between the tuning knob and the tuning knob recess to reduce play. | ||
| - | - Hum from the power supply. | + | * Hum from the power supply. |
| * Possible Remedy (have not tried yet): Install a 15V IC regulator in the power supply. | * Possible Remedy (have not tried yet): Install a 15V IC regulator in the power supply. | ||
| - | - Deafening thump upon turning on the 1254 when using headphones. REALLY LOUD. | + | * Deafening thump upon turning on the 1254 when using headphones. REALLY LOUD. |
| * Remedy: None yet although I suspect a large capactior may resolve this one. | * Remedy: None yet although I suspect a large capactior may resolve this one. | ||
| - | - A little bit of "thumping" due to slow synthesizer lock. Not too bad, really, considering | + | * A little bit of "thumping" due to slow synthesizer lock. Not too bad, really, considering |
| the price. | the price. | ||
| Paul | Paul | ||
