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Listening to a 2nd frequency using a tranceiver


Guest Robw
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Hi,

 

We have got only one radio in our plane. I'd like to be able to listen to the area frequency to be aware of the commercial flights, but use as active frequency the CTAF frequency as the area the I fly in most, is dotted with CTAF fields.

 

Does anyone know if one could connect a tranceiver, or a scanner to the headset cable while still connected to the aircraft's radio?

 

Cheers,

 

Rob

 

 

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Just for your info, the Microair 'upgrade' is actually a replacement radio. The radio is effectively traded in for a new one, so you don't get your old one back.

 

The Microair, Xcom, new Icom and Garmin all have this functionality now which is good. Atleast they are all catching up with each other.

 

 

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Another idea which is worth considering:- If you have a pocket scanner, make up a lead to connect its headphone output to an audio input on your intercom. It will then work similarly to the dual watch transceivers, with the exception of not being able to set a priority frequency. If the channels are busy, you'll get them both at once, so use the volume to set the secondary frequency to be in the background. Turn it up if anything interesting comes in!

 

 

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My transceiver does have an audio output. So I need to check if the intercom has an input socket. If not, than I might persue the flightcell option.

 

Thanks for all your advice,

 

Rob

 

 

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Hi All

 

The Microair M760 revision N that I have has a DB-25 connector in its wiring harness.

 

Pin 24 Brown of the DB-25 is designated as AUX Audio signal (Music) input Mono.

 

Pin 25 Gray of the DB-25 is designated as AUX Audio ground input Mono.

 

Regards

 

 

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Keep in mind though that the airline traffic will be way above you enroute so it will not actually be "traffic" for you. The only time airline aircraft will be traffic for you is when arriving/departing an airfield - when they will be on the CTAF that you are monitoring anyway!! (Unless they put in the wrong frequency of course, which happens, so a good lookout is important.)

 

So monitor two frequencies if you like but it probably won't make much difference.

 

 

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I find the second frequency most useful for listening to the chat channel, listening to ATIS & AWIB, plus my destination CTAF when I'm a long way out so I can get a feel for what's going on before I get there. Some times 10 miles at break-neck speed (eg 230 knots in the Cirrus) isn't enough time to get a feel for what's happening up ahead particularly when 10 miles only takes a bit over 2.5 minutes!

 

 

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Guest pelorus32

I find the second frequency very useful because whilst IFR traffic may be well above you in cruise, they are also faster and they may not be above you.

 

By listening to the area frequency you get a broader situational awareness. You get pre-warning that the RFDS Kingair will be inbound at your CTAF and will get there at about the same time it takes you to return from the training area at 100 knots...before they have to call on the CTAF. You get pre-warning of the police helicopter transiting through your airspace when you are en-route and outside a CTAF and below 5000 feet! Both of these are real situations.

 

Listening on area frequency is a very good thing IMHO.

 

Regards

 

Mike

 

 

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Remember that you don't have to start monitoring the frequency at 10 miles - you can monitor as far out as you like. Maybe 20 miles or so.

 

I've flown VFR and IFR with one radio, and a friend of mine operated aircraft at a minimum of 420 knots (7 miles/minute) on approach with one radio. Standard ops were to call 15 miles out (2 minutes) to get runway direction, etc.

 

A second radio can be good but it really isn't required.

 

 

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