Sigtronics SPO N - Manual

Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
Phone: (909) 305-9399
E-mail: [email protected]
Web Site: www.sigtronics.com
High Noise Environments Models: SPA-400N / SPA-600N
SPA-4SN
Sport 200 / Sport 200S
SPO-22N / SPO-42N / SPO-62N
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Helpful Hints for Communicating in Unusually High Noise Environments.
The Sigtronics N series high noise environment voice activated intercoms have been specifically configured to obtain
the optimum “signal-to-noise” ratio for successful cockpit communications in the “noisiest” of aircraft. Aircraft applica-
tions will include Open Cockpit, Ultra-Lights, Warbirds, or Helicopters.
It must always be emphasized, however, that the intercom is only one component of the total communications system.
The headsets chosen to be used are critical in determining the overall performance of the “System”. For example, it is
futile to attempt using any headset that is not noise attenuating. The “stick-in-the-ear” or open frame type headsets
are fine for the 787 cockpit environment, but are absolutely useless for the environment we’re discussing.
For this environment, it is suggested that the Sigtronics S-20, S-45, S-58 or S-68 headsets be seriously considered for
use. They are light weight for comfort (11.9 to 12.3 oz.), have good noise reduction and have microphones specifically
designed for the most difficult noise conditions encountered in Military, General Aviation, and Airborne Law Enforce-
ment. The M-80 and M-81 electret microphones are an essential part of the success of these headsets. If you have a
S-40 headset, you can substitute the M-80 microphone. Also, we can retrofit the M-80 and our receivers to your helmet.
All Sigtronics headsets are RFI and EMI immune and work superbly in fabric aircraft or in close proximity to antennas.
The following list of “Helpful Hints” is designed to maximize the performance of your Sigtronics Intercom System and
allow “hands-free” cockpit communications where no previous intercom could!
1. If your current appropriate headsets have adjustable microphone gain settings, turn them down. This serves to
improve the signal to noise figure of merit of most microphones. (Applies to David Clark H10-30, many models of
Telex, and Peltor models with the amplified dynamic mic. Contact manufacturer for instructions.
2. In the Open Cockpit environment or when the boom mic is subjected to direct air blasts, large, foam type mic
muffs should be used. We have a suitable muff available.
3. Correct positioning of the boom mic in relation to the mouth is important! Adjust so that the mic is to either side
of the mouth (off center) but no more than ¼” away (one can “kiss” the “talk” portion of the microphone.)
4. Most important of all: Adjust the Headset receiver volume control(s) for maximum volume. Adjust the Intercom
volume control to the lowest setting that allows good communications.