Ziggy
16th Oct 2006, 09:54
I want to buy the above mentioned headset but cannot find an answer to my questions.
Some of you might be familiar with the KA version of this headset in which the active noise reduction (ANR) uses power supplied by a small battery box attached to the headset cord. The new KAP version (according to Sennheiser's website) receives power from the aircraft through the microphone connector PJ-068 (the so-called microphone bias) instead of a battery box and requires 28V DC. The KAP-2 is similar but works with anything between 12-35V DC.
Telex sells the Airman 850 ANR which works exactly the same (according to the wording on their website) but on a lower voltage, I believe 8V DC.
I fly the B737-NG and have several colleagues using this Telex headset and it works! Will the Sennheiser work as well?
To be sure I asked both Sennheiser Germany and Sennheiser USA. Where Sennheiser USA didn't even bother replying, Germany said the following:
"You cannot compare the system operation of the Telex Airman 850 and the Sennheiser HMEC25-KAP like this and we cannot confirm that the KAP or KAP-2 will or will not work on your aircraft."
Since I do understand that a big company like Sennheiser apparantly doesn't have time to test their equipment on a rare and impopular airplane like a 737, I see no other option then to put the question to my fellow ppruners.
Does anybody have any experience using the Sennheiser HMEC25/45-KAP or -KAP-2 on a B737-NG or any Boeing aircraft?
Or does any engineer know (or is willing to test) the power supply voltage from the microphone bias on the 737NG.
Thanks very much,
Ziggy
Some of you might be familiar with the KA version of this headset in which the active noise reduction (ANR) uses power supplied by a small battery box attached to the headset cord. The new KAP version (according to Sennheiser's website) receives power from the aircraft through the microphone connector PJ-068 (the so-called microphone bias) instead of a battery box and requires 28V DC. The KAP-2 is similar but works with anything between 12-35V DC.
Telex sells the Airman 850 ANR which works exactly the same (according to the wording on their website) but on a lower voltage, I believe 8V DC.
I fly the B737-NG and have several colleagues using this Telex headset and it works! Will the Sennheiser work as well?
To be sure I asked both Sennheiser Germany and Sennheiser USA. Where Sennheiser USA didn't even bother replying, Germany said the following:
"You cannot compare the system operation of the Telex Airman 850 and the Sennheiser HMEC25-KAP like this and we cannot confirm that the KAP or KAP-2 will or will not work on your aircraft."
Since I do understand that a big company like Sennheiser apparantly doesn't have time to test their equipment on a rare and impopular airplane like a 737, I see no other option then to put the question to my fellow ppruners.
Does anybody have any experience using the Sennheiser HMEC25/45-KAP or -KAP-2 on a B737-NG or any Boeing aircraft?
Or does any engineer know (or is willing to test) the power supply voltage from the microphone bias on the 737NG.
Thanks very much,
Ziggy