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Topic Options
#365332 - 12/17/17 09:31 AM I've got a new one for you guys...
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
Since the Navy sucks, I'm looking into flying my 172 with the CG Air Aux. One of the requirements is a marine VHF radio with external antenna installed in the aircraft.

I'm trying to come up with the cheapest legal option, and it's tough.

I figure I can drill an inspection panel and install an antenna with a rubber insert---that way I don't have to drill the fuselage. I can run that cable to a BNC that attaches to a handheld radio in the cockpit (and I can use the antenna for a backup aviation handheld too---I like redundancy). As far as I know, this isn't illegal, as long as it's signed off by an A&P.

Now the tricky part---how do I integrate into the headset without messing with COM1/2 or ICS? Ideas?


Edited by C420sailor (12/17/17 09:31 AM)
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#365337 - 12/17/17 10:28 AM Re: I've got a new one for you guys... [Re: C420sailor]
Desert Hawk Offline
Silver Pilot

Registered: 06/30/13
Posts: 919
Loc: Phoenix, Arizona
Some audio panels have pins for other audio inputs, some might be non-switched. So maybe there is an option to bring out one of those to a jack on the panel somewhere (and if you have to, you could add a switch in series)...
_________________________
karl
1975 C172M-180

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#365340 - 12/17/17 10:55 AM Re: I've got a new one for you guys... [Re: Desert Hawk]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
My audio panel is an old KMA-20. I doubt it has anything additional haha.

I do want to re-do the panel soon. Maybe I'll see what the avionics shop says...having one hard mounted might not be the worst thing in the world.
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#365341 - 12/17/17 11:07 AM Re: I've got a new one for you guys... [Re: C420sailor]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
Although it does have an 'EXT' that will go to an 8 ohm ramp hail speaker or 4 ohm PA speaker. That's transmit only though---and I'm not sure if a handheld marine radio will accept that resistance for the mic jack.

I do have a set of CEPs that I can wear under my headset and plug into the handheld...that would solve the receive issue.


Edited by C420sailor (12/17/17 11:07 AM)
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#365342 - 12/17/17 11:15 AM Re: I've got a new one for you guys... [Re: C420sailor]
Desert Hawk Offline
Silver Pilot

Registered: 06/30/13
Posts: 919
Loc: Phoenix, Arizona
Originally Posted By: C420sailor
My audio panel is an old KMA-20. I doubt it has anything additional haha.


The manual for a KMA20 shows that pin 30 is ADF Audio IN adn pin 31 is DME Audio In. Any chance you are not already using one of those?
_________________________
karl
1975 C172M-180

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#365343 - 12/17/17 11:20 AM Re: I've got a new one for you guys... [Re: Desert Hawk]
Desert Hawk Offline
Silver Pilot

Registered: 06/30/13
Posts: 919
Loc: Phoenix, Arizona
One other idea would be to take the Audio To and Audio From signals connection to/ from your COM2 and run those through a dual pole switch which would essentially allow you to swap COM2 for your new radio with one switch... Its a little more wiring, but would probably work pretty smoothly as long as you dont need COM2 and the new radio at the same time...

from the for what its worth department...
_________________________
karl
1975 C172M-180

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#365344 - 12/17/17 11:22 AM Re: I've got a new one for you guys... [Re: Desert Hawk]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
Neither one! I forgot about those!

I wish I could install a transmit switch like the one in the jet. Forward to transmit on COM1, aft to transmit on COM2. No rotating knob dance.


Edited by C420sailor (12/17/17 11:23 AM)
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#365374 - 12/17/17 03:35 PM Re: I've got a new one for you guys... [Re: C420sailor]
Flyboy712 Offline
Bronze Pilot

Registered: 08/27/14
Posts: 623
Loc: Washington
Most of these setups I've seen have had antennas mounted on the tail boom just aft of the elt antenna. Audio panels are NAT made by Cobham which allow several com radios to be installed.

Something like the AMS43 for single transmit or AMS44 for dual transmit with up to 5 com radios or an AA12S if you want a single transmit with 3 coms.

Northern Airborne Technologies and one of the model numbers above plus Google will get you there.

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#365773 - 12/20/17 09:48 PM Re: I've got a new one for you guys... [Re: C420sailor]
Leadnut Offline
Second in Command

Registered: 01/06/13
Posts: 173
Loc: ID Coeur d Alene
You've got my curiosity. Why does the Navy suck? Did you draw the big thingy in the sky?:=))
_________________________
The difference between an engine failure in a twin engine and a single engine is the distance to the scene of the crash.

Take it easy, it's a joke!

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#365812 - 12/21/17 02:52 PM Re: I've got a new one for you guys... [Re: Leadnut]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
I would've added some veins to it.

It's a long story. Simply put, I'd rather staple my sack to my leg and run a marathon than deal with Navy medicine again, and the Navy as a whole doesn't value its aviators. Instead of helping you get healthy and/or putting you in another aircraft, they'd rather show you the door and cough up the years and tens of millions of dollars to get some new jack to that same point.

It's the same reason that the AF is over 2,000 pilots short, yet won't accept prior service, fully trained pilots to plug the hole. They don't value their most important asset: their people.
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#365816 - 12/21/17 05:44 PM Re: I've got a new one for you guys... [Re: C420sailor]
Flyboy712 Offline
Bronze Pilot

Registered: 08/27/14
Posts: 623
Loc: Washington
Sounds identical to my story when I was flying in the Army. They did it to a lot of really great pilots. It's too bad and the funny thing is I fly a lot more doing the same thing now.

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#365843 - 12/22/17 09:54 AM Re: I've got a new one for you guys... [Re: Flyboy712]
Don Tedrow Offline
Platinum Pilot

Registered: 07/16/10
Posts: 3659
Loc: Bastrop, TX
When I was instructing Army helo pilots in fixed wing, most couldn't wait to get out because they barely got enough flying hours to stay current. They were probably getting 3-4 hours a week with us, and perhaps only an hour per week in their helo.

This was mid-late '70s though.
_________________________
1972 F33A Bonanza


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#365856 - 12/22/17 02:53 PM Re: I've got a new one for you guys... [Re: Don Tedrow]
Flyboy712 Offline
Bronze Pilot

Registered: 08/27/14
Posts: 623
Loc: Washington
It was the same when I was in. A good year was 120hrs. Most of us were getting just what it took to be current which was around 70hrs a year. If you weren't in RL1 status (passing a mission checkride) you probably wouldn't get it and those guys were flying maybe 30hrs a year.

If you ran accross a 2000hr pilot that was really high time and it took those guys 15-20yrs to do it.

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#365858 - 12/22/17 03:09 PM Re: I've got a new one for you guys... [Re: Flyboy712]
C420sailor Offline
Gold Pilot

Registered: 11/18/16
Posts: 1435
Loc: Virginia
I was flying about 15-18 hours a month. A typical air-to-surface training sortie was about a 1.5, and a BFM was usually closer to 1.0-1.1. The only time you'd see over 2hrs was if you spent a decent amount of time 'hanging on the blades'.

18,000lbs of dinosaurs can last ya nearly 3 hours, or 12 minutes, depending on how you move your left hand.


Edited by C420sailor (12/22/17 03:16 PM)
_________________________
Currently transitioning from the F/A-18E to the C-172M...to a damn desk.

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#367619 - 01/04/18 11:59 PM Re: I've got a new one for you guys... [Re: C420sailor]
Kentucky Captain Offline
Gold Pilot

Registered: 06/13/14
Posts: 1301
Loc: Mount Washington, KY
That's not enough flying to maintain currency, much less proficiency.

I was a boom operator on the KC-135 in the late 70's and in three years of flying, I logged almost a thousand hours. And that was during the cold war where we had to sit on a week of alert, ready to go to war, every month.
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