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588relaynoise [2007/08/19 03:58] n5na created |
588relaynoise [2007/08/21 15:52] n5na |
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Paul, W9AC | Paul, W9AC | ||
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+ | **August 19, 2007** | ||
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+ | I received several private replies concerning this mod. First, previous Omni transceivers also used nearly-silent reed relays for | ||
+ | T/R switching -- in addition to the loud amplifier PTT key line relay. You may have thought your Omni used solid-state T/R | ||
+ | switching, but if you were to listen closely, you would hear the slight "ticking" of the reed relay during T/R transitions. | ||
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+ | The Omni VII uses a HV transistor for amplifier switching, leaving only a small signaling relay for the T/R switching function. But | ||
+ | this relay is a bit noisier than RF reed relays I've used in the past. | ||
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+ | The Aromat/Matsushita relay I purchased for the project is a model RSD-12V. There's a guy on the popular Internet auction site that | ||
+ | sells them for about $11 each. Also, AG6K sells them. These are superb RF relays that switch in ~ 1.0 ms without the addition of an | ||
+ | accelerator circuit. | ||
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+ | The 22 AWG flexible silicone wire was purchased from Trossen Robotics: | ||
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+ | http://www.trossenrobotics.com/store/p/5224-22AWG-High-Strand-Count-Silicone-Wire-Combo-Pack-25-ft-.aspx | ||
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+ | Paul, W9AC | ||
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