For all you electronic buffs out there, I have a 121.5MHz transmitter, and for those of you who don't know 121.5MHz is an emergency frequency, used in ELT's. ELT, is an Emergency Locating Transmitter, they are used in planes, boats, and sometimes hiker's use them, when ever a plane takes a few G's, it turns on, as with a boat, it sinks and the ELT floats to the surface and activates, of course they can all be activated manually.
Being in the Civil Air Patrol (US Air Force Auxiliary) I take part in the search for these devices, most are false alarms, battery going bad, or some bloke activates it accidentally. When ever we find ELTs in a boat, we usually confiscate them, so we currently have a hand full of them at our disposal.
I have taken apart an ELT and removed the 121.5MHz crystal, I'm looking to put in a 121.775MHz crystal, but I have only been able to find one vendor who supplies them, I Email him, but no word back yet.
One more thing to add is that the ELT I'm working with transmits on both 121.5, and 406.0, but there is only one crystal, so I'm assuming the 121.5 is doubled (terminology?) to 406.0, and if my calculations are correct the 121.77 replacement crystal would be doubled to 406.92MHz, do you think that it will bleed over to 406.0? If it does it will be useless, because 406.0MHz is also an emergency only frequency.
I have attached a picture of the crystal, does anyone know where I can buy another?
Being in the Civil Air Patrol (US Air Force Auxiliary) I take part in the search for these devices, most are false alarms, battery going bad, or some bloke activates it accidentally. When ever we find ELTs in a boat, we usually confiscate them, so we currently have a hand full of them at our disposal.
I have taken apart an ELT and removed the 121.5MHz crystal, I'm looking to put in a 121.775MHz crystal, but I have only been able to find one vendor who supplies them, I Email him, but no word back yet.
One more thing to add is that the ELT I'm working with transmits on both 121.5, and 406.0, but there is only one crystal, so I'm assuming the 121.5 is doubled (terminology?) to 406.0, and if my calculations are correct the 121.77 replacement crystal would be doubled to 406.92MHz, do you think that it will bleed over to 406.0? If it does it will be useless, because 406.0MHz is also an emergency only frequency.
I have attached a picture of the crystal, does anyone know where I can buy another?