There have been reports of Pieps DSP avalanche transceivers accidentally turning off due to the design of the Off/Send/Search switch's "locking tab." This tab is supposed to prevent the switch from inadvertently changing. This page explains this issue.
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Pieps transceivers with press-to-unlock tabs include:
Of the above transceivers, only the Pieps Sport is still being sold.
All of the reported problems have been with the larger, yellow locking tab (as found on the DSP Sport and DSP Pro), although the smaller, gray locking tab on the original DSP avalanche transceivers could, theoretically, exhibit these problems.
These potential problems do not affect the newer Powder BT/Recon BT or Pieps Pro BT/Black Diamond Guide BT transceivers. The locking mechanisms on those newer transceivers need to be slid, rather than pressed, to unlock the Off/Send/Search switch.
There are three potential problems with the locking tabs on DSP transceivers. One is that the plastic tab can crack, as shown below. It is helpful to press the tab while looking for cracks. (I did receive a credible report of a locking tab that cracked on the back side.) Regardless of the make or model of your transceiver, you should perform a physical inspection of your avalanche transceiver periodically.
The second potential problem is the that locking tab might not lock the Off/Send/Search sliding switch. This might be the result of the sliding switch having been forced between Off, Send or Search without the tab being pressed, which can damage the locking mechanism. You should test that the sliding switch is locked in place every time you switch to Send mode. A video in this Instagram post explains how to inspect the switch on DSP transceivers.
The third problem is more nuanced. It occurs when something presses the locking tab which releases the sliding switch, and then a force is applied that causes the sliding switch to move to the Off position. This is more likely to occur if the transceiver is put in its harness backwards (i.e., with the screen facing outward), because pressure on the harness's Fastex buckle can then press on the locking tab. This is shown in this YouTube video. There are also videos where a DSP is placed in its harness with the screen facing the correct direction and continual pressure is applied to the transceiver (pressing the locking tab against the wearer's ribs). Both of those cases, although recreatable, seem less likely to occur under real-world conditions. The problem shown in this video (and others), however, is much more concerning. It shows a DSP where the sliding switch can be moved when the transceiver is in its harness without intentionally applying pressure to the locking tab. This problem appears to be specific to individual transceivers and is unrelated to the harness that is used.
It is worth noting that when the locking tab fails to prevent the sliding switch from moving, regardless of the cause, an additional inline force is needed to move the sliding switch.
If you do not have 100% confidence in your DSP transceiver, Pieps is offering aggressive upgrade pricing. They are also replacing some transceivers at no charge. For more information, contact firstname.lastname@example.org.
If you do choose to use a Pieps DSP transceiver:
The first three of these recommendations apply to all avalanche transceivers. The last recommendation, whether the locking tab will remain effective when the transceiver is in its harness, is DSP-specific.
If you do encounter a problem with your transceiver's switch, please send me a note.