Replacement Radios

Replacement Radios

Hello all.  Need some advise.  We just purchased a 1977 172 w/ the old Cessna 300 radios.  We are only keeping the plane for a couple of years for training.  The NAV/COMM's are in the avionics shop now and one of them will probably not be salvagable.  We are thinking about replacing it with one of the Michel TKM MX-300 slide in replacement radios. This would be a quick and cheap fix because we would not have to do any rewiring or rack replacement.  I am wondering if anyone out there has heard anything about these radios. They run about $1,500 new.   I can't find any reviews on the internet.  The guys at the avionics shop have heard of them but they have never ordered them nor have the worked on any.  Any other suggestions are always welcome.

Thanks!
Amber

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Re: Replacement Radios

If you're only going to keep the plane for a couple years, it would probably be cost effective.   I have heard pros and cons on the Michel radios but no first-hand experience.  I've heard that shops don't like to work on them, and the signal output doesn't match up with the Kings, etc.  But for a slide-in replacement that works, as opposed to the old Cessna radios---it's a definite improvement.  You may also want to check out Narco--I believe they also have slide-in replacements.

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Re: Replacement Radios

I have them in my '77 172 and the work fine. I have never had a problem with them.

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Re: Replacement Radios

You might take a look at this site...
<http://www.avionix.com/navcoms.html>
Feel free to email or call them with questions.
I've found them very helpful in the past.
Rewireing can get pretty pricey.

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Re: Replacement Radios

Amber,
I have the TKM (Michel) MX170B's in my 172G and I love them. They have higher transmit power than the King KX175B's I had and they provide flip flop and memory storage for frequently used frequencies. Avionics shops don't like them because they don't make much money on the install since they replace existing radios using existing trays and wiring. The TKM factory people are very nice and they do most repairs for under $100.
Michel Avionics Products
TKM Inc.
14811 North 73rd St.
Scottsdale AZ 85260
480-991-5351

Wish Garmin would do repairs at a reasonable price.

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Re: Replacement Radios

The TKM radios have become more reliable in the last couple of years.
The Avionics shop I work for has sold a few over the years and have had pretty good experience with them. I personally don't like the audio quality but I only listen to them on the bench. There is some digital noise that I notice in the quiet environment, but I guess is not heard in the cockpit.
I don't mind working on them and the factory folk are extremely helpful.
Would we rather sell a CNX80/MX20 etal instead of an MX300? Of course, but not if it doesn't fit the owners situation. If it keeps the owner and the airplane together in GA then an MX300 sale suits us fine.

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Re: Replacement Radios

There are many threads on this radio.  Do a search on this forum, using the search feature on the menus.

good luck

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Re: Replacement Radios

Thank you all for your help.  I think we will go with it and give it a try.

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Re: Replacement Radios

On the subject of the TKM radios, I have owned two in the past and found them to be every bit as reliable as the 155s I had been using. 

I do have a question though.  I have just bought another Cessna 172H and the plane is equiped with the M170Bs, which is the same radios I had in my last Warrior II.  The question concerns the VOR/LOC indicators.  They are the Michel MC 60 digital and I know nothing about them.  Anyone know where I might find or download a manual?

Thanks

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Re: Replacement Radios

On the TKM radios, I purchased a MX-385, had it installed in a R182 for 6 months before the receiver developed a problem. Sent it in for warranty repair, found out that TKM had their repair status withdrawn pending FAA approval of them being their own repair station...make sense? So as of October 1st, 2004 they had 80 some radios awaiting repair based on FAA approval of them being a repair station. FYI....

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Re: Replacement Radios

Did you ever get your TKM radio back?  Was it a hassle?  I bought a Michel MX12 a couple of months ago, and it is acting up (screen reads jibberish, won't transmit).  Do I have to go through the factory for warrantee service or can I just get my local radio guy to repair it?  Thanks for the info.

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Re: Replacement Radios

I have dual MX300's in my '77 Skyhawk.  They work well although there has been an intermittent problem which I can't duplicate with consitency.  When transmitting (usually on the ground but sometimes in the air) there is bleedover on the guard frequency.  It annoys the controllers to no end. This seems to happen mostly with Comm 1 but sometimes with Comm 2.   I have had the plane to a couple of avionics shops and no one has found a problem.  I sent one of the radios back to TKM to be checked and $600 later they sent it back to me stating that they had to replace a transmit/receive synthesizer.  The problem contiues to this day....

It might not be the radios, however.  I was told by one avionics shop that they saw this problem once before.  They believed that the original Cessna antenna's are too close together for the power output of the TKM's, causing bleedover.  They told me that the original Cessna radios didn't have this problem as the frequency range was too coarse to casue a problem.  Their fix was to relocate one of the Comm antennas, which they said solved the problem.  Sounded plausible to me but I didn't go that far.  My personal guess is that there's a bad wire or ground somewhere as the problem is intermittent.

In any case, I do like the TKM's after using them for awhile.  They are a bit more difficult to manipulate than some other radios but there are a lot of features packed into them for the money.  After dealing with several avionics shops I'm under the impression that they don't deal with them more as they can't make any money on them.  Although TKM states they can repair most problems for <$100 I have not met nor heard of anyone who has been able to get a repair for less than several times that.  They're solid state, though, so there shouldn't be too many repair issues.

This was probably more information than you asked for but I hope it helped.

Gary

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Re: Replacement Radios

Gary,

I own a Piper Arrow that had KX170's when I bought it a year ago.  I replaced one of them with a Michel MX170C and flew with it for 5 months to see how it performed.  I didn't have any problems at all so last month, I purchased the 2nd and I am experiencing the same bleed-over you talked about.  My newest radio is Com 1 and the 5 month old is Com 2.  This is what is happening with mine:

*Both coms turned "on" and transmit on Com 1, it bleeds onto another frequency at my base airport.

*Both coms turned "on" and I transmit on Com 2, no bleed-over.

*Com 1 "on", Com 2 "off", transmit on Com 1, no bleed-over.

*Com 2 "on", Com 1 "off", transmit on Com 2, no bleed-over.

If this is anything like the problems you are having, I would guess it is some kind of design flaw and Michel should take responsibility for any repairs.  Since mine are 5 and 1 month old respectively, I am going to contact them and see what they tell me but I don't intend on paying for any repairs since they are still under the 2 year warranty.

Let me know if your problems are similar, Good luck,

Barry
San Diego

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Re: Replacement Radios

I sent in a Michel TKM MX-11 from my Mooney over a month ago for repairs (2nd time - won't transmit), and just got off the phone with their service dept.  Apparently their "Service Dept". is just one guy and he's been on vacation most of Dec.  He will be getting back to me later this week.

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Re: Replacement Radios

I have the Narco Cessna Replacement, I like better than the TKM it works well not had any trouble with it but only owned it for 6 mo's.

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Re: Replacement Radios

I have the Narco Cessna replacement and have had 15 years of trouble free service.

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Re: Replacement Radios

I had the MX300 radios in my skyhawk and we have had problems with comm 1 sent it back to the factory and we had lender but it took us about 3 months to ge it back because we were one the radios that were held up because of the FAA. now we haveing problems again. I would advise againist getting them

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Re: Replacement Radios

several years ago I had a problem with my Narco altitude encoder.  I sent it to Narco factory service.  Three weeks later I called because i hadn't heard anything.  the service guy on the phone said " I'll be getting to it right away! he hadn't even looked at it.  After about six weeks I got the encoder back.  It cost me about 30 dollars less than a new unit which I could have had delivered overnight from other suppliers.  I will never purchase any more Narco equipment, and I wiil replace any that become defective rather than repair them. good luck

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Re: Replacement Radios

I have them on my 1981 C-172P and they just work fine.

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Re: Replacement Radios

I just removed a KX-170A and replaced it with an MX-170C. The swap took all of 30 seconds and the COMM and NAV worked fine. Then I flew it to check the VOR. No problem with anything so far. Now I just have to read the instructions to learn how to program up to 50 frequencies in each of the COMM and NAV units.

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Re: Replacement Radios

I have recently prchased an older Cessna (1973) with a TKM MX12 in the panel. It is hooked up to what appears to be the original VOR/OMNI head. Does the MX12 have a glide slope reciever built into it, if not, does anyone know how much it would cost for a receiver and GS indicator? Is this a practical Solution?

Daniel

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Re: Replacement Radios

I had a MX170 installed in a C172 that had two KX170's. I was able to compare the old working King with the new MX170. The King always outperformed the Michel. I complained to the shop that installed it and he just swapped them and told me to try them again. This confirmed that the Michels are just not as good

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Re: Replacement Radios

I am thinking of replacing my old King 170B nav/com with a Michel 170C.  This would be the #2 radio in a Beech A36. The No. 1 is a Bendix 155.

Any reason why I shouldn't??  Thanks.

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Re: Replacement Radios

I have a 1966 cessna 150F that I put a MX300G radio into, It has a built in digital vor and glideslope. Does anyone know what external vor and glideslope indicators are compatible with this unit?

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Re: Replacement Radios

I just bought a Cessna 150F out of a farmer's field.  It is all original 12Volt.  The avionics and gyros have to be replaced.  Can I put a TKM MX-11R in it without much modificaiton?  Do I need a step-up transformer? Can I just have a wireing harness made at a local avionics shop, buy a mounting tray and have my A&P install the MX-11R without much modification?

Or..... what alternatives do I have, given this is a VFR bird for a poor man with an expensive habit.

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