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Depending on what you paid for it may be time for a trip to White's. If I was around my old shop I would swap out the coil to check it but you probably don't have that option. Nothing to lose at this point and maybe a loose item or connection will be revealed. When all else fails, I give the detector some good shakes and knock the control box around a bit. So make sure of that coil connection, check the pins, wiggle the coil cable. Many detectors sent in for service have one bad battery out of the set, or a battery in backwards.Īfter batteries coils are like ten times more likely to fail then control boxes. Triple check the batteries, maybe even swap them for yet another fresh set. All I can suggest is disconnect the coil and reconnect again firmly. Surely you do not have the coil sitting on a table near metal or something but have to ask. Well, I have to assume it worked when you got it and this happened later. It's quiet for about 5 seconds, then screams! Doesn't matter what knob I turn, the volume is overwhelming. What am I doing wrong?" Beacons with this pattern are being tested to determine if existing DF equipment can DF on the intermittent signal."I picked up a GM 2 with long scan coil at a pawn shop. Replaced the batteries and turned it on. The new proposal is to make the 121.5 MHz signal intermittent (0.75 second on, 1.5 seconds off, repeating). There is currently little to no 406 MHz ground DF capabilities/tools available and several countries have stated that they currently cannot afford to transition their SAR units from 121.5 to 406 homing. One of the reports stated:Īlthough the ultimate desire would be to remove 121.5 MHz from the homing equation, it is clear from the SAR response community that is currently not possible. CAP and USCG were mentioned in this context.įortunately, the proposal to drop the 121.5 MHz homing signal was not accepted by the Cospas-Sarsat program. > if homing is needed, SAR can use 406 MHz DF. > position accuracy doesn't require homing on 121.5 MHz > the SGB needs power for other functions, but the beacon can't get bigger > the continuous 121.5 homing signal uses most of the beacon power and drives battery size One of the design goals was to remove the 121.5 MHz homing signal. The Second Generation Beacon (SGB) is in development internationally. And of course, there is no practical or relatively inexpensive ground 406 DF equipment. A beacon transmits on only one frequency. Five of the 11 frequencies are currently in use. > 222 Becker DF-517 (Beckers are built by RhoTheta)īut the DF-517 can only receive one of the eleven 406 beacon frequencies, while the RT-600 can receive all of them. In 2015 I asked NHQ for the number of CAP aircraft equipped with 406 DF. We do not need to equip all our aircraft with them. They are not going to have the ELT direction finders in them.
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Maj Gen Vazquez talked about aircraft purchases and other issues. I've had an effectively dead L-Per in our aircraft for years.From page 25 of the minutes of the BoG meeting of 8-9 December 2014:
#SEIMAC PROFIND MANUAL TROUBLESHOOTING UPGRADE#
QuoteSounds like motivation to push that Becker upgrade program along. The problem is that these handhelds generally don't have the sensitivity of a purpose built DF unit, so often aren't good at longer ranges. The use of handheld receivers with or without a Yagi is a common method for finding beacons, particularly in close proximity to the beacon, and should be taught as part of UDF training. (Maybe I'm missing something?)Yes, there are handheld radios that receive 121.5. Using a Seimac ProFIND 121.5 MHz homing unit, the ground search and rescue volunteer. QuoteAre there no handheld radios with a signal strength meter? Connect a yagi antenna and you would be good to go. team into the area to help locate the aircraft and its occupants. The cheese block would be my first choice, followed closely by a vintage L-Per, but people are holding on to those with their cold dead fingers. The successor model made by MetOcean doesn't ship with CAP frequencies andĪppears to be designed primary for use at sea, which is where all the 500Ps should be dumped. Thankfully these are no longer in production. There is also the Seimac ProFind DF-500P, but based on this forum topic, results are not the best: We have established a waiting list for those interested in placing an order as well as for those wishing periodic updates on progress." We are investigating our options to build another production run, but the lead time from selecting resources to finished product is going to be quite lengthly.
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"Our last production run of the LL-16 Little L-Per direction finder will soon be sold out, which is sooner than we had anticipated. These are excellent, and haven't been available since mid-2015. The L-Tronics LL-16 "cheese block" Little LPer is still around, they are the standard at NESA: