Matronics Email Lists Forum Index Matronics Email Lists
BBS Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Baklan Radio Issue

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List
View previous topic :: View next topic  
Author Message
TXYak



Joined: 02 Aug 2008
Posts: 14

PostPosted: Tue Apr 28, 2009 5:31 pm    Post subject: Baklan Radio Issue Reply with 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


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
View user's profile Send private message
keithmckinley



Joined: 11 Aug 2008
Posts: 434

PostPosted: Tue Apr 28, 2009 7:39 pm    Post subject: Re: Baklan Radio Issue Reply with quote

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

keith(at)mckinley.us


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
View user's profile Send private message
nigel(at)yakdisplay.com
Guest





PostPosted: Tue Apr 28, 2009 10:29 pm    Post subject: Baklan Radio Issue Reply with quote

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




- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
Rob Rowe



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

PostPosted: Wed Apr 29, 2009 3:58 am    Post subject: Re: Baklan Radio Issue Reply with quote

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


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
View user's profile Send private message
mark.bitterlich(at)navy.m
Guest





PostPosted: Wed Apr 29, 2009 8:58 am    Post subject: Baklan Radio Issue Reply with quote

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


--


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List



smime.p7s
 Description:

Download
 Filename:  smime.p7s
 Filesize:  4.81 KB
 Downloaded:  215 Time(s)

Back to top
TXYak



Joined: 02 Aug 2008
Posts: 14

PostPosted: Wed Apr 29, 2009 2:00 pm    Post subject: Re: Baklan Radio Issue Reply with quote

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


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
View user's profile Send private message
Rob Rowe



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

PostPosted: Wed Apr 29, 2009 3:38 pm    Post subject: Re: Baklan Radio Issue Reply with quote

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


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List
Back to top
View user's profile Send private message
mark.bitterlich(at)navy.m
Guest





PostPosted: Thu Apr 30, 2009 8:49 am    Post subject: Baklan Radio Issue Reply with quote

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

Mark


--


- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List



smime.p7s
 Description:

Download
 Filename:  smime.p7s
 Filesize:  4.81 KB
 Downloaded:  204 Time(s)

Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Yak-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group