Posted: 2/5/2011 4:02:52 AM EDT
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I just installed a new yaesu FT 8900R rig in the car for mobile work. I also want to use the cross band repeat feature while camping etc.
1. I can't figure out how to configure the HT to x band repeat. 2. When I open the door to my car the power to the rig cuts off the rig. How can I configure the mobile rig to remain powered on so I can use xband repeat over a weekend camping trip. 3. Won't leaving the rig powered up drain the battery? |
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Quoted:
I just installed a new yaesu FT 8900R rig in the car for mobile work. I also want to use the cross band repeat feature while camping etc. 1. I can't figure out how to configure the HT to x band repeat. we sorta need to know what HT you have to help out here. you need a 70cm capable handheld for legal cross band repeat; the HT TX's on 70cm to the FT8900, and the FT8900 TXs on 2m to the world. see http://www.cvarc.org/tech/crossband.html Quoted:
2. When I open the door to my car the power to the rig cuts off the rig. How can I configure the mobile rig to remain powered on so I can use xband repeat over a weekend camping trip. this has nothing to do with the rig and everything to do with how you have it powered from teh vehicle. the 12Vdc power leads from the radio should terminate directly on the vehicle battery. based on your issue description above, this is clearly not the case. how is your FT8900 connected to your vehicle electrical system? Quoted:
3. Won't leaving the rig powered up drain the battery? yes. during receive the radio draws about 0.5A. during transmit, depending on the output power setting, the FT8900 can draw up to 10A. these power consumption numbers are covered in your manual on the specifications page. the current draw, therefore, is a composite of how long the radio is in RX mode, and how long it is in TX mode. (by the way, this is a good reason to re-read the link above and determine how "locked-band" (simplex) repeating works, since it will save you at least half the transmit time and therefore a ton of power). a typical automotive battery has a "reserve capacity" of about 80AH at 25A discharge rate. such a battery will supply 8A for around 500minutes, or about 6 hours. you do not want to completely discharge the battery of course, as this will make starting the vehicle difficult AND potentially damage the battery. so if you figure a conservative 25% of capacity, you are looking at about 1.5 hours of total radio TX time. since the radio will be in RX mode most of the time (hopefully) you can operate far longer. but to do these calculations we need to know what size battery you have in your vehicle. ar-jedi |
| Shameless plug... How I x-band repeat with my FT-8800R -> https://rebby.com/blog.php?cat=16&detail=46 |