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g;ideslope capture

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jfrjr(at)roadrunner.com
Guest

Posted: Mon Apr 26, 2010 7:48 am Post subject: g;ideslope capture

Slowly, oh so slowly, working my way through the GRT/430W/SL30/TRUTRACK set up menus.  I now have everything talking nicely to each other and most everything seems to be working except for one interesting problem.  Both the 430 and SL30 capture the localizer well (10-15 miles out), and the 430 captures the glideslope at the usual distance, but the SL-30 only picks up the glideslope when I am very close in (like one mile).  Dispite the SL30 capturing the localizer could this still be an antennae problem (mine are Archers in the wing tips)?  I could reverse the ants. to see what that does but it would be a lot of work because of the coaxial routing.  Any suggestions?  Jay Rowe #40301 (flying with 50 hours).

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rv10builder(at)ericksonjc
Guest

Posted: Mon Apr 26, 2010 8:02 am Post subject: g;ideslope capture

Jay,



You are using separate antenna for the 430 and the SL-30, correct? (With a splitter for the 430 since it requires separate GS and LOC inputs if I remember correctly?)



One fairly easy test would be to swap the coax from the splitter input to the SL-30 and the SL-30 to the splitter (ie using the "other" antenna for the other receiver.) This will tell you if the issue is in the box or downstream. Assuming it's downstream, I'd look at bad coax crimps. The antenna is a fairly simple device and as long as everything is screwed in, I can't really see much going wrong... The crimps on the other hand could easily be creating problems that could easily be more apparent on one frequency band than another...



Good Luck,



John

#40208 Wings (Still)



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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Mon Apr 26, 2010 10:11 am Post subject: Re: g;ideslope capture

You didn't use any splitter on the SL-30 input, right? It has an internal one.

I'd try to get a short length of coax, and a female to female adaptor, to temporarily splice the known good antenna to the SL-30. If the problem persists, then you know it's internal to the SL-30. Maybe a bad internal splitter, or something else.

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_________________
Bob Turner
RV-10 QB

jesse(at)saintaviation.co
Guest

Posted: Mon Apr 26, 2010 11:00 am Post subject: g;ideslope capture

That's exactly what I would recommend.  Isolate the problem and then narrow it down until you find the cause.  Ideally, you would actually switch the antennas, like you said you didn't want to do because of the coax.



Another option would be to find someone who has another SL-30 that you could slide into your tray and see if the problem is the radio or the wiring.  If you are getting the Loc signal at the same distance on both radios, but the glideslope is not the same, then my thoughts would be something in the radio, which would be solved by swapping radios with someone.



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



On Apr 26, 2010, at 2:11 PM, Bob Turner wrote:



 	  Quote: 	
		   

 

 You didn't use any splitter on the SL-30 input, right? It has an internal one.

 I'd try to get a short length of coax, and a female to female adaptor, to temporarily splice the known good antenna to the SL-30. If the problem persists, then you know it's internal to the SL-30. Maybe a bad internal splitter, or something else.

 

 --------

 Bob Turner

 RV-10 QB

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=295762#295762

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