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#1
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It will provide a log file adequate for use at most contests. YMMV--contact
the CD to make sure "ContestID67" wrote in message oups.com... One of the main points is to protect the recorder so that you retain your all important log file. While what you propose will get you back home, it won't produce a valid FAI log file. |
#2
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On Tue, 14 Jun 2005 18:11:11 -0700, ContestID67 wrote:
2) Use two batteries with an A/B switch. This requires the recorder to be able to survive the failure until you flip the switch. Some can handle short power outages, others cannot. I have no test data to suggest how long of an outage they can handle while a good battery is switched in. We installed two batteries with changeover switches, so we have a warning when one battery is flat (like a the reserve tap on a motorbike fuel tank). But our Volkslogger runs off a separate circuit which is connected to both batteries via low voltage drop electronic diodes. It draws current from which ever battery has the highest voltage. I have tested it and cannot reset the Volkslogger without unplugging both batteries. (But I can measure the battery voltage on any one battery with the VL battery test function simply by unplugging the other. The voltage reading is that after the diode loss, slightly less than what the rest of the panel sees - unfortunately I can only do this on the ground) Ian |
#3
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I use either 1N5401 or NTE5802 diodes ahead of my master
switch, so they are powering my whole panel. I understand that they have a 3 amp capacity. I've never had any problems with them. I recollect that they have a 0.6 V drop, so I don't have to worry about switching batteries, the diodes do that automatically when the battery in use drops to 0.6 V below the battery not in use. It's very convenient. All I have to do is select my higher voltage battery before I take off. I can't take credit for the idea or design. I got it from Nick Bonniere. At 04:48 18 June 2005, Ian wrote: On Thu, 16 Jun 2005 09:37:07 -0700, ContestID67 wrote: I agree that a couple of diodes are the way to go to place the batteries in parallel without allowing one battery to cause problems with the other. However the key is the voltage drop which is typically 0.6vdc for a power diode. Do you have a specific diode number that you have been using? I used two IN5817's. I only use these to power a Volkslogger. The rest of the panel is still controlled via 'A/B' switches. These are rectifying diodes with low forward voltage drop, especially at low currents. In my setup I think I loose less than 0.2V but it is tricky to measure. These are small diodes with a Max current rating of about 1A. I don't think that you could power your whole panel through them. (Google should find you a data sheet). Having the switches for the heavy current items (transponder etc) is useful. It is very difficult to test the health of a battery on the ground. So you normally only discover that the battery is not up to scratch when it dies while you are flying. At this stage it is nice to be able to switch over to battery B. Ian |
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