Sigtronics SPO N User Manual

High Noise Environments Models: SPA-400N / SPA-600N

SPA-4SN
Sport 200 / Sport 200S
SPO-22N / SPO-42N / SPO-62N

Helpful Hints for Communicating in Unusually High Noise Environments.

The Sigtronics N series high noise environment voice activated intercoms have been specically congured to obtain
the optimum “signal-to-noise” ratio for successful cockpit communications in the “noisiest” of aircraft. Aircraft applica­tions 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 ne 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 specically
designed for the most dicult noise conditions encountered in Military, General Aviation, and Airborne Law Enforce­ment. 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 retrot 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 gure of merit of most microphones. (Applies to David Clark H10-30, many models of
Telex, and Peltor models with the amplied 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
mus should be used. We have a suitable mu 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 (o 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.

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Sigtronics Corporation

178 East Arrow Highway
San Dimas, CA 91773
Phone: [phone]
E-mail: [e-mail]
Web Site: www.sigtronics.com

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High Noise Environments Models: SPA-400N / SPA-600N

SPA-4SN
Sport 200 / Sport 200S
SPO-22N / SPO-42N / SPO-62N

SPA-400N / SPA-600N Description

The SPA-400N (4 Place) and SPA-600N (6 Place) panel mount intercoms are specically congured for very high noise
environments, such as Ultra-lights, Open Cockpit aircraft, and all Warbirds.

Features:

1. The SPA-400N / SPA-600N have circuitry that allows you to use either the voice activated intercom mode or a

push-to-intercom mode. In order to use the push to intercom mode, you will need to install a separate PTT switch
for this purpose. This feature is sometimes desirable in open cockpit and ultra-light aircraft where wind noise can
be a problem. Using a large windscreen on the mic is very helpful, however.

2. Special High Noise circuitry

3. Stereo capability: If you want to have stereo/switching in the aircraft, order our ST-400N (4 Place) or ST-600N (6

Place) and our S-45S, S-58S or S-68S stereo headsets.

*If you have a Warbird (T-28, T-6, etc.) with the original military intercom, call Sigtronics regarding the best use of the
SPA-400N.

For the best communications in high noise aircraft, it is highly recommended that you use the Sigtronics’ high noise
proven M-80H mic, either on one of our headsets or incorporated into your helmet. Call us regarding upgrading your
helmet for the ultimate in communications.

SPA-4SN Description

The SPA-4SN 4 place panel mount intercom has the push-to-intercom feature and special high-noise circuitry. This
intercom has inputs for stereo music, all in one compact package.

Sport 200 / Sport 200S Description

The Sport 200 and Sport 200S are 2 place panel mount intercoms designed for Light-Sport, Ultralights and Rotary
Wing aircraft. They incorporate special high-noise circuitry and have the push-to-intercom feature that the SPA-400N
has. The Sport 200S is the stereo model.

SPO-22N / SPO-42N / SPO-62N Description

The SPO-22N (2 Place) / SPO-42N (4 Place) / SPO-62N (6 Place) portable intercoms are like the SPO-22 / SPO-42 /
SPO-62 in the brochure, however they incorporates special high-noise circuitry. They do not have the push-to-intercom
feature that the SPA-400N has. The SPO N intercoms work well in Ultralights and other high-noise environments, and
with hand held radios.

Sigtronics Corporation

178 East Arrow Highway
San Dimas, CA 91773

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Phone: [phone]
E-mail: [e-mail]
Web Site: www.sigtronics.com

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