As per my earlier post, number of channels is not the determining factor. If yours is not on the BAD list you are OK.
Your Coupe has a 13.8 Volt electrical system refered to as 12V or 14V, all the same animal.
the "other" is 24V-28V these wont work in your coupe,
Forget the watt output, all modern certified aircraft PANEL radios are ok. (handhelds not so)
The ARCs have always had a bad reputation but I know many that are still working fine.
Always start looking at the EASIEST, cheapest fix first. This forum fits that bill.
There are lots or A&P-IAs in this group willing to help.
Garmin stack probably wont fit in your panel, and would weigh WAY too much.
Bill
From: Linda Abrams <[EMAIL PROTECTED]>
Reply-To: Linda Abrams <[EMAIL PROTECTED]>
To: "Ercoupe Technical Discussion (moderated)" <[email protected]>
Subject: [COUPERS-TECH] Re: radio transmitting problem
Date: Sat, 23 Dec 2006 09:13:31 -0800
>----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
>
>
>Thanks, everyone, for your thoughts, advice & suggestions! A very big extra
>Thank You to Wayne Woollard, who is kindly sending me a known-to-be-working
>Cessna 300-series radio to slide in and see if the old one is simply dying.
>And to Glen, who tracked it down for me.
>
>Also to Hartmut, who flat-out said not to waste money on new mag noise
>filters, because those could not affect transmission, only reception.
>
>I also appreciate everyone's ideas for
>what-else-to-check-until-the-doctor-gets-there. Also in case I swap out
>radios and the problem is still there.
>
>A few follow-up questions:
>
>1. Do I understand correctly from the posts that the Cessna 300-series
>radios (both mine & Wayne's that's on the way) are not 760 channels and
>therefore not regs-compliant? If some are, and some aren't, how do I tell
>by looking at it, whether one is? (I did say I'm ignorant of
>electronics...)
>
>2. Do all the Cessna 300-series fit in the same tray? Can I just slide
>Wayne's in and expect it to work? Or might I have to do something else to
>it?
>
>3. I tried Google-ing the Cessna 300-series to see what its transmission
>watts are, but couldn't find that info among the flood of ads for 300-series
>replacements. Does anyone know off-hand?
>
>4. Until Wayne's gets here, my back-up radio is an ICOM A-23 handheld
>model, with (I think) 5 watts transmission power, and a headset adapter.
>Should that be sufficient for communicating in city flying (L.A. area)?
>Some people have said this needs to be wired into the airplane's antenna,
>but others have said not to do that. I would rather not, unless it's
>required to get adequate transmission. Do our list experts have a consensus
>on this issue?
>
>5. I started to Google some of the modern replacement radio models that
>have been mentioned in your posts, but find the ads don't always state how
>many watts transmitting power, and my CFI said that is important. Is there
>any kind of a chart to which anyone can direct me that does a direct
>compare-contrast among these replacement models (kind of like Consumer
>Reports would do)?
>
>6. My CFI has been encouraging me to go for 10 watts. Is 10 watts what you
>all would advise? Or is that overkill? (But then, he also wanted me to buy
>the ~$8000 Garmin stack, "because it's soooo cool!" However, I'm more a
>simple-analog-type, not into getting elaborate & expensive electronics just
>for their own sake or being "cool." )
>
>7. In considering a replacement radio, do I need to find out what voltage
>my plane's electrical system produces? I see some ads say 12-volt, some 14,
>some more. Can this be tested from the cigarette lighter?
>
>Thanks again for helping, gentlemen!
>
>Linda
>N3437H
>
>
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