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Baklan Radio Issue

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TXYak

Joined: 02 Aug 2008
Posts: 14

Posted: Tue Apr 28, 2009 5:31 pm Post subject: Baklan Radio Issue

I have the Baklan Radio in my 52.  I just recently got the plane flying and have never had the radio working properly.  It transmits great but doesn't receive anything.  I have tried a different radio(that does work) and got the same result.  I tried a different antenna with the same result.  I tried a different amplifier with the same result.  The intercom works perfectly and like I said the radio transmissions were reported clear by a friend about 30 miles away.  Any suggestions?



Chris Keating

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Tue Apr 28, 2009 7:39 pm Post subject: Re: Baklan Radio Issue

Hey Chris...Keith here.. drop me a line.



keith(at)mckinley.us

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nigel(at)yakdisplay.com
Guest

Posted: Tue Apr 28, 2009 10:29 pm Post subject: Baklan Radio Issue

I had similar problems. Spent a furtune fault finding. In end had to  

give up due cost, and installed a garmin sl40.



Nigel



On 29 Apr 2009, at 02:31, "TXYak" <CKeating(at)peoplepc.com> wrote:



 	  Quote: 	
		   



 I have the Baklan Radio in my 52.  I just recently got the plane  

 flying and have never had the radio working properly.  It transmits  

 great but doesn't receive anything.  I have tried a different  

 radio(that does work) and got the same result.  I tried a different  

 antenna with the same result.  I tried a different amplifier with  

 the same result.  The intercom works perfectly and like I said the  

 radio transmissions were reported clear by a friend about 30 miles  

 away.  Any suggestions?



 Chris Keating





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 41804#241804

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Rob Rowe

Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

Posted: Wed Apr 29, 2009 3:58 am Post subject: Re: Baklan Radio Issue

Chris,



Mark B is the expert ... but you might just try the following as a long shot.



With the Baklan radio removed from its mount take a look at the back of the mounting tray. 



Underneath at the back (located by a couple of screws into the tray mount rails normally covered by the radio) is an audio frequency adapter/amplifier module thats used to match the radio receive output to the impedance of downstream avionics.



On removing the locating screws (found mine to be loose and only kept in by the radio sitting on top trapping the screw heads) the adapter can be unplugged and examined ... as I recall it can be lifted out through the gap in the tray base, you don't need to dismantle anything else or get access to the tray underside.



The adapter has a multiway electrical connector into the tray which if disturbed / dirty / damaged  might replicate the nil RX problem you described ... as electrically it sits in between the Baklan radio and the intercom (both of which you've already swapped out).



This should only take a few minutes to check out given the modular design and it's electrically non-invasive ... so you cannot do much harm inspecting it as there's nothing to tweak and only two audio transformers. two transistors, a resistor and a couple of capacitors inside.



Anyway probably worth a look ... if nothing else just to eliminate this from the usual suspects.



brgds, Rob R

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mark.bitterlich(at)navy.m
Guest

Posted: Wed Apr 29, 2009 8:58 am Post subject: Baklan Radio Issue

Rob, thanks for the compliment.  Although I am an Avionics person by

profession, I have only repaired a few Baklan models, and have only the

original Russian manual for the R/T (not translated).  Actually I think Rob

has a better grasp on the specifics regarding the whole YAK-52 layout than I

do. 



That said, we really have to define the specifics.  "Transmits great but

does not receive"  is too ambiguous. We can narrow down what is happening by

answering the following questions: 



1.  When you transmit, can you hear yourself talk through your headset (this

is called "side-tone")?

2.  When you turn the squelch switch off, do you hear static? 



Let's start with that and go from there.  



What we are trying to deduce is as follows: 



A.  Do we have an actual problem with the RF stages?

B.  Do we have a problem with an AUDIO wire?  



In the end, we are going to have to try and find the audio path from the

radio R/T itself to the headset.  From there we will have to obtain an audio

source generator... The cheapest source for that is from Lowes... They sell

a telephone tracker set that consists of a warbling tone audio generator and

an inductive pickup probe.  These are invaluable tools when tracing down

lost audio problems.  More than likely, this problem is beyond the scope of

someone not trained in the troubleshooting and repair of defective audio

systems.  Of course, we're not "there" at this point since we are not sure

what exactly is "missing".  



It seems unlikely that you have a coax feedline or antenna problem since you

say it transmits to someone else A-OK.  But, that is not a definite for SURE

situation.  If you want to make sure that is not the problem, locate the

antenna coax that connects to the radio itself.  Unscrew it.  Take a piece

of wire... Any wire, even safety wire, and stick it into the center

conductor of the radio's coax connector.  Not the coax leading to the

antenna mind you, but the RF connector actually mounted on the radio.  We

are NOT going to transmit with this wire stuck in there, but if you really

wanted to try that, you could make it about 22 inches long and that would

work.  Regardless, about a foot long is fine for this receive only test.

Just make sure the wire does not come in contact with any ground.  Hang it

by a piece of string. Use your imagination...  It's not critical.  Get a

hand-held radio.  Transmit about 5 feet away from this wire you have hanging

out of your antenna connector on the radio itself.  Can you receive now?

Note:  Only do this test if the answer to question number "2" above is YES.

If the answer is NO, you are wasting your time.   



Mark Bitterlich  

 



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TXYak

Joined: 02 Aug 2008
Posts: 14

Posted: Wed Apr 29, 2009 2:00 pm Post subject: Re: Baklan Radio Issue

Thanks all for the help.  Rob, you sent me to exactly the right spot.  When I slid the radio out, the "audio frequency adapter/amplifier module" was completely missing.  This has been the case with several things on this airplane.  I borrowed one out of another Yak and it works perfect.  As luck would have it....I was given a box of "old Yak crap"  I rummaged through it and found a radio tray with the module still installed.  Im in business.



Thanks again!



Chris Keating

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Rob Rowe

Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

Posted: Wed Apr 29, 2009 3:38 pm Post subject: Re: Baklan Radio Issue

Hi Chris,



Pleased that worked out for you ... it's satisfying when the occasional long shot pays off!



Just take care that the missing adapter isn't still floating around in avionics bay somewhere, as that could really spoil your day if it works further aft.



Cheers, Rob

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mark.bitterlich(at)navy.m
Guest

Posted: Thu Apr 30, 2009 8:49 am Post subject: Baklan Radio Issue

Well done Rob.  I would not have thought of that. 



Mark

 



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