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Standalone intercoms: PS and NAT are top picks: in a world of integrated audio panels, there's still a place for standalone intercoms. But if you expect top performance, don't scrimp on the wiring.

Although anyone who learned to fly during the 1970s suffered the 90 dB din of an unmuffled cabin, that's old school now. These days, we all wear headsets and panels have audio systems or at least intercoms, which make the endeavor more civilized. We see ever more airplanes that have integrated audio panels with built-in intercoms. Even the basic current production audio switching panels have on-board voice-activated stereo intercoms, which place all of the audio controls in a single console. This saves room on the panel and streamlines installation.

[ILLUSTRATIONS OMITTED]

Still, that's not the only way to skin the audio cat. Several manufacturers offer standalone intercoms whose only job is seat-to-seat communication. But in an age of sophisticated audio panels, is there still a place for these products? Yes, but only for owners whose needs are modest and who don't foresee wanting things like entertainment, traffic systems or GPS systems that output high-quality audio. Basic stand standalone intercoms are inexpensive --under $500 for most--but not necessarily cheap to install. If you're a dyed-in-the-wool utilitarian who only wants to talk to the passengers, one of these could be a good choice. Just know this: Dedicated intercoms don't have growth potential--what you see is what you get. A full-blown audio panel may be a better choice.

COST/BENEFIT

There's no arguing that an integrated audio system upgrade, such as Garmin's GMA340 or PS Engineering's PM8000, pays big returns in overall audio quality and builds in room for future growth. They also save room on the panel by keeping intercom and audio switching controls in a single box. Further, integrated audio panel/intercom systems have switched and unswitched auxiliary inputs for remote traffic systems, cellphone inputs, autopilot automation and engine monitoring warnings.

Downside? You have to wire all that stuff and that can get expensive. Even so, we strongly suggest considering a new combination audio panel/intercom and the rewiring and clean-up that goes along with the installation. In our view, investing in good audio is money well spent. And pay a little extra for sturdy and attractive audio jack housings and push-to-talk switches for pilot and copilot, along with entertainment input jacks installed in areas that are easy to access without cluttering up the cabin with wires.

[ILLUSTRATIONS OMITTED]

If the aircraft doesn't have an intercom of any kind--kind of rare these days--there won't be passenger audio jacks and the shop will need to remove or at least access the interior to route the wiring, mount the audio jacks and reassemble the interior. If this is the case, consider a full audio system upgrade rather than a standalone intercom. The fewer times a shop removes and reinstalls interior components, the better. Some interiors just never seem correct after removal.

Installation costs could get into the thousands for just a standalone intercom and it doesn't make much sense to spend that sum just for an intercom when a new integrated audio panel won't cost much more.

But if you currently have a good audio panel, say the Bendix/King KMA24, and the associated wiring is in good shape, a standalone intercom might be the best choice. Or, if you have a dated intercom such as the David Clark Isocom or an old Sigtronics SPA400, a modern intercom upgrade would be worth considering. Keep in mind, however, that your shop might want to replace the wiring and this sometimes means starting from scratch. Don't try to talk them out of it; performance will suffer with old, ratty wiring.

PS ENGINEERING

Pioneers in aircraft audio, PS Engineering set the standard by which all intercoms are judged, in our view. The PM1000-series four-seat intercom offers excellent audio with features that pilots want, chief among them being dual independent volume and squelch control for pilot and copilot, which is standard on the PM1000II. The rear seats retain the same volume and squelch setting as the copilot. Prices are $299 to $499.

The PM1000II is available with dual entertainment input--it comes standard with a single input--which allows crew and passengers to listen to their own music. There's also a crew isolation feature, so the front seats and rear passenger seats can be isolated for privacy. A readback recorder option is also available.

The PM1000-series is a mono intercom, so if stereo quality is your desire, you'll need to step up to the PM3000 series, which also supports up to six seats. Unfortunately, the PM3000 doesn't have dual volume and squelch control. But we think that if you fill that many seats all the time, an integrated intercom/audio panel is a better solution. A version of the PM1000 is made for highnoise environments and even one for larger airplanes that utilize dual audio panels, such as King Airs with older Collins Pro-Line radios.

Our many years of using and installing the PM1000 series has proven that it's one of if not the best choice in standalone intercoms for quality, features, price and factory technical support. Its wiring should be readily compatible with the company's combination audio/ICS panels, if installed correctly.

NAT

Northern Airborne Technologies (NAT) in Canada has perfected audio control for helicopters, airborne law enforcement and numerous other applications. The AA-80 series intercom fits right into this product line. Dual volume and squelch control plus entertainment input circuits are standard. The controls on NAT's general aviation products are as rugged as they are in NAT's higher-end products and are offered in various configurations and mounting schemes.

There are versions of the AA80 series that excel in entertainment input tricks and music muting options (AA85) and even include a way to adjust the volume on the music input circuit. Prices are $355 to $895.

We've found NAT audio quality to be excellent--none of that tinny, raspy sound you get from lesser audio products. We haven't seen many NAT intercom failures, either, which bodes well, in our view.

SIGTRONICS

Sigtronics has achieved success with the four-place SPA400 and six-place SPA600 intercom systems over the years. These are basic intercoms that seem to get yanked from panels during major upgrades and replaced by integrated audio panels. The used market is loaded with removed units that can be had for as little as $50. They're OK for basic two-place trainers, in our opinion, but we've always frowned upon Sigtronics' claim that their systems don't need shielded wiring during installation.

There are just too many imperfections and stray signals in many aircraft electrical systems that end up as noise in the intercom circuit. The SAS-440 and six-seat SAS-640 has a one-touch squelch setting button that sets the squelch threshold for a given environment. It has pilot isolation and is available in multiple mounting schemes, which is helpful for tight panels.

There's a stereo add-on module (RMS440 and RMS640) that allows for stereo entertainment input by receiving an input from a remote music device. The model SPA-4S is made for tight spaces, measuring 1 by 2.5 inches and can be mounted horizontally or vertically. It's a basic system, but has stereo capability and music input, plus it comes in a version made for high-noise environments, such as helicopters and warbirds.

The SCI-series intercoms offer dual volume and squelch control. The four- or six-place SCI-series systems don't have music input capability, but can be an easy drop-in upgrade to an existing SPA400 or SPA600. A reader mentioned to us that the Sigtronics line is confusing, given the choices of different models and we don't disagree. Sigtronics does, however, enjoy a lasting presence in the aircraft audio industry and keeps its intercom line from growing stale. Prices on Sigtronics products range from $219 to $479.

FLIGHTCOM

Flightcom makes products for the military and is well-known for their Denali line of noise-canceling headsets. The company founder started building intercoms after struggling to hear his flight instructor while taking lessons during the late 1980s. His portable design actually won our product of the year in 1986.

The model 403MC is pitched at space-limited panels, so if you just can't find room in your panel for an intercom, the 403MC might be your only hope. It measures 2.6 by 2.3 by 1 inch high. It's relatively no frills, but does have pilot isolation, entertainment input and failsafe circuitry. Price is $179.

The six-place 403D features a digital voice recorder, copying 32 seconds of communication, plus it has entertainment input with music muting during communications. This unit sells for $339.

CONCLUSION

When we looked at standalone intercoms some five years ago, we couldn't put our finger on a slam-dunk winner, given the choices in a narrow market niche.

Intercoms are tough to judge other than critiquing sound quality and basic features. Nothing has changed to sway our view. In general, a four-place intercom installation will cost close to $2000 installed, not counting entertainment switching and ANR headset interfaces and assuming no wiring exists. It may be less if sound wiring is already in place.

We're still impressed with PS Engineering's audio quality, standard features and reliability in their PM1000 series. Similarly, we think NAT has perfected the audio quality for small cockpits through trickle-down technology from their higher-end products. When an intercom system fails, it can cause all kinds of strange audio-related problems that just aren't acceptable for any mission, so quality should be a priority.

Given this, our top recommendation goes to the PS Engineering PM1000II with a near second choice to NAT's AA-80 intercoms as an alternative to an integrated audio panel/intercom unit. We think either would be a good choice. Just be sure your installer doesn't scrimp on necessary wiring upgrades. They're a must to get the most out of these systems.

CHECKLIST

(+) Standalone intercoms are a good choice if you don't have need for high quality external audio input.

(+) The hardware is inexpensive and the performance is impressive, but ...

(-) ... installation may bring the all-in cost to $2000 or more.

(-) Don't even consider a standalone if your airplane has an older or inadequate audio panel.

Larry Anglisano is Aviation Consumer's avionics editor. He works at Exxel Avionics in Hartford, Connecticut.
 PRODUCT    PRICE   SEATS   COMMENTS

PS ENGINEERING (www.ps-engineering.com/800-427-2376)

  PM501     $299      4     Entry level, single volume and squelch.

PM1000 II   $309      4     Good audio quality, good music input,
                            reliable, dual, volume and squelch, mono.

 PM1200     $499      2     High noise applications, a version can be
                            remotely mounted.

 PM3000     $493     4-6    Single volume and squelch control, stereo
                            with karaoke mode.

NAT (www.northerairborne.com/888-763-2232)

  AA80      $355     4-6    Numerous versions available, solid
                            performer, music input and excellent
                            value.

  AA83      $895      4     Excels in music input and custom settings,
                            too pricey for most owners compared to an
                            audio panel.

SIGTRONICS (www.sigtronics.com/909-305-9399)

  SCI-4     $349      4     Crew mode standard, squelch indicator
                            lights for easy squelching. Available in
                            stereo version.

  SCI-6     $479      6     Six-seat version available in both stereo
                            and high-noise version.

 SPA-400    $216      4     Basic mono intercom, no music, SPA-600 is
                            six place version. Good value for the
                            money.

 SPA-440    $440     4-6    Push button autosquelch, SAS-640 is four
                            place version, music input optional
                            interface

 SPA-4S     $399      4     Stereo, compact. Good for tight panels.

FLIGHTCOM (www.flightcom.net/800-432-4342)

  403S      $269      6     Push button autosquelch, SAS-640 is four
                            place version, music input optional
                            interface.

  403MC     $179      4     Pilot isolate, music input, small
                            footprint, stereo.

  403D      $399      6     Stereo, readback recorder, variable
                            faceplate sizes

   403      $245      6     Mono, multiple faceplates.

DAVID CLARK (www.davidclark.com /800-298-6235)

 DC-COM     $70       6     Unique split audio capability, music input
                            jack integrated, large bezel takes space.
                            High price compared to competition.
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Title Annotation:AVIONICS MARKET SURVEY; PS Engineering and Northern Airborne Technologies
Author:Anglisano, Larry
Publication:The Aviation Consumer
Date:Oct 1, 2007
Words:1923
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