Hello, has anyone here gotten the VNAV feature to work on the Lear with the RXP GTN750? I had it working perfectly with the F1 GTN but made the switch to RXP because F1 stopped supporting their version. With the RXP 750 my VNAV doesn’t seem to work. I’ll see the glideslope bug coming down and I’ll press the GS button but once it passes the middle of the sight glass my Autopilot never captures the Glideslope but it did every time with the F1 version. So am I doing something wrong? 

Edited December 28, 20214 yr by Deltaair1212

5 hours ago, Deltaair1212 said:

Hello, has anyone here gotten the VNAV feature to work on the Lear with the RXP GTN750? I had it working perfectly with the F1 GTN but made the switch to RXP because F1 stopped supporting their version. With the RXP 750 my VNAV doesn’t seem to work. I’ll see the glideslope bug coming down and I’ll press the GS button but once it passes the middle of the sight glass my Autopilot never captures the Glideslope but it did every time with the F1 version. So am I doing something wrong? 

It is not clear to me what the issue is. Are you saying that during an ILS approach (if the GTN is in VLOC) or during something like a LPV approach (if the GTN is in the GPS mode), the AP does not capture the glide slope or glide path, respectively?

And what sim are you using? Note there has been a recent update to the RXP GTN 750 in response to the latest P3Dv5.3 + hotfix.

Al

Edited December 29, 20214 yr by ark

I am running 4.5 and I am speaking about when in GPS mode shooting a RNAV approach. Whenever I had the F1 version it was as simple as pressing the GS button with my AP activated and whenever the glideslope bug captured the aircraft started to descend. With RXP, the aircraft will let the glideslope bug go right past the middle of the sight glass and it will not capture. I have heard rumors that RXP does not simulate LNAV with their GTN 750 but other people in different forums say it is simulated if you do it correctly so I just want a straight answer. Has anyone gotten LNAV to work with the Learjet in GPS mode? 

Edited December 29, 20214 yr by Deltaair1212

 

46 minutes ago, Deltaair1212 said:

I am running 4.5 and I am speaking about when in GPS mode shooting a RNAV approach. Whenever I had the F1 version it was as simple as pressing the GS button with my AP activated and whenever the glideslope bug captured the aircraft started to descend. With RXP, the aircraft will let the glideslope bug go right past the middle of the sight glass and it will not capture. I have heard rumors that RXP does not simulate LNAV with their GTN 750 but other people in different forums say it is simulated if you do it correctly so I just want a straight answer. Has anyone gotten LNAV to work with the Learjet in GPS mode? 

I just tried an RNAV approach with the RXP GTN750 in P3Dv4.5 with the Lear and it captured the Glide Path as expected.  I also have not seen any reports of problems with the RXP GTN as you have reported, so it seems we need to figure out why you are having this problem on your system. So a couple of questions:

After installing the RXP GTN into the sim, did you run the Flysimware Lear35 Management Tool from the Win10 start menu under Flysimware's Learjet 35? This tool installs the correct panel.cfg file for the RXP GTN into the Lear Panel folder.

Have you tried an approach at a different airport?

You said above that "I have heard rumors that RXP does not simulate LNAV with their GTN 750". Perhaps did you mean VNAV?

Note that VNAV is not the same thing as capturing a glide path. VNAV is typically used to descend from a cruise altitude, or to meet altitude restrictions when flying a STAR, etc. I recall that with the Flight1 you could make use of the yellow "glide path" indicator/pointer as an indication if you were descending on an intended VNAV path, such as when leaving your cruise altitude. As far as I know, the RXP GTN does not provide that type of "yellow indicator " VNAV display, although it will provide you with a VSR (Vertical Speed Required) value. Of course, the RXP GTN does drive the yellow glide path/glide slope pointer during an approach.

Al

 

 

Yes I have made sure to go into the FSW tool and click single RXP 750. And yeah I know about the VNAV thing I’m just trying to get my LNAV to work. I typically do not do a complete STAR approach as I fly into smaller regional airports. But some of the smaller airports with visual approaches will have a glideslope available and I would use it with my F1 GTN but I can’t with the RXP version. It works with F1. Idk it’s all confusing now to be honest. My Learjet does not capture the glideslope with RNAV and visual approaches is the easiest way I can describe it. 

1 hour ago, Deltaair1212 said:

I’m just trying to get my LNAV to work.

Lets first address the LNAV issue, then we can work on the approach glide path problem.  I assume LNAV not working means the GTN750 will not follow the flight plan route you have entered into the GTN750, that is, after takeoff if you engage NAV on the AP and the GTN is in GPS mode,  the Lear will not fly from one waypoint to the next, etc. Do I understand that correctly?

Al

If you pop the GTN750 out of the panel and hover you mouse in the upper right corner of the GTN frame above the NAV freq location while holding down the Shift key, if you then right click you should get a popout  that looks something like this:

How do the first 7 entries on your system compare to the above?

Al

Edited December 29, 20214 yr by ark

4 minutes ago, ark said:

If you pop the GTN750 out of the panel and hover you mouse in the upper right corner of the GTN frame above the NAV freq location while holding down the Shift key, if you then right click you should get a popout  that looks something like this:

How do the first 7 entries on your system compare to the above?

Al

There’s my issue! Most of the options are greyed out! I can’t click on them! I can’t choose GPS-SIM option because I can’t click on it! Btw I’m at work not at my computer but yeah I remember I can’t do any of that. Why do you think that is? 

23 minutes ago, ark said:

Lets first address the LNAV issue, then we can work on the approach glide path problem.  I assume LNAV not working means the GTN750 will not follow the flight plan route you have entered into the GTN750, that is, after takeoff if you engage NAV on the AP and the GTN is in GPS mode,  the Lear will not fly from one waypoint to the next, etc. Do I understand that correctly?

Al

And my GTN follows my flight plan beautifully as advertised it’s just capturing glideslopes that is the issue 

1 minute ago, Deltaair1212 said:

And my GTN follows my flight plan beautifully as advertised it’s just capturing glideslopes that is the issue 

OK, good, so there is no LNAV ( Lateral NAVigation) problem.

Al

Just now, ark said:

OK, good, so there is no LNAV ( Lateral NAVigation) problem.

Al

I guess not just my settings are screwed up mine are mostly greyed out 

39 minutes ago, Deltaair1212 said:

There’s my issue! Most of the options are greyed out! I can’t click on them! I can’t choose GPS-SIM option because I can’t click on it! Btw I’m at work not at my computer but yeah I remember I can’t do any of that. Why do you think that is? 

 

45 minutes ago, ark said:

If you pop the GTN750 out of the panel and hover you mouse in the upper right corner of the GTN frame above the NAV freq location while holding down the Shift key, if you then right click you should get a popout  that looks something like this:

How do the first 7 entries on your system compare to the above?

Al

But how did you get those settings unlocked?? 

2 hours ago, Deltaair1212 said:

 

But how did you get those settings unlocked?? 

In your main Lear folder you should have an RXP file called RealityXP.GTN.ini. If you open that file in a text editor like Notepad or Notepad++, part of that file should look something like this where lines starting with a ; are comments. Note the line that begins with locked. Entries on those lines can not be changed from the settings popup window that I posted above. You can delete entries from the locked line and then those entries should be modifiable from the popup window (may require a sim restart or a/c reload, not sure).

There may be other sections of this file for GTN_750_2, or GTN_650_1, etc. Since you are only using 1 GTN 750 you are not concerned with these other sections of the file if they exist.

So, there are a couple of things you can try, but first make a backup copy of your RealityXP.GTN.ini file (just copy and past it back in to the Lear folder.

Options are:

1. If you are comfortable using a text editor, you can try replacing the two sections below called  [GTN_750_1] and [GTN_750_1.DEFAULT] in your RealityXP.GTN.ini file with what I have below to see if that makes a difference.

2. You can unlock some of the settings by deleting those entries from the locked line below.

 

[GTN_750_1]
; comma separated list of read only settings.
locked = LinkOto,LinkCrs,LinkObs,LinkVor,AutoNavGps,AutoSelect,UseFailures,LinkSimGps,AutoSavePln,UseAltMouse,UseLegacyVars
; is the master device if true.
MasterDevice = true
ReduceRate = false
LinkCrs = true
LinkObs = true
UseSimGpsCmds = true
LinkSimGps = true
AutoSavePln = true
UseAltMouse = true
FuelType = JETA
OwnshipIcon = BUSINESS_JET
; TAWS approach air speed (knots) or -1 (auto detect Vref: 130)
TawsApprSpeed = 113
; TAWS flap extension speed (knots) or -1 (auto detect Vfe: 260)
TawsFlapSpeed = 260
; TAWS gear extension speed (knots) or -1 (auto detect Vle: 260)
TawsGearSpeed = 260
VoicePref = MALE
; aviation db: 0: nav_db2_grm, 1: nav_db2, 2: nav_heli_db2_grmn, 3: nav_heli_db2
NavDbType = 1
; connects to: 'PFC_GTN' or any '#PID' (#D067 for PFC_GTN)
; no value connects to first found, 'OFF' disables connection.
HardwareDevice =
; hardware selector number or -1 to disable.
HardwareIdx = -1
UseRyanTcad = true

[GTN_750_1.DEFAULT]
; show screen only gauge if true.
nobezel = false
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; display mouse tooltips if true.
tooltips = false
; enable mouse clickspots if true, disable if false.
usemouse = true
; enable alternate click-spots (left CCW, right CW, middle Push) if true.
usealtmouse = false
; enable touch beyond screen bounds if true (2D only), clip if false (GTN native).
extendtouch = true
; auto-resize dimension (width,height)
refsize =
; left mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225) (requires SHIFT+left mouse button).
popleft =
; right mouse button on the screen toggles popup window by ident (ex: GPS_PANEL or 225).
popright =
; adjust brightness (0 to 100)
brightness.bezel = 100
; offset brightness (-100 to +100)
brightness.screen = 0

 

Edited December 29, 20214 yr by ark

Notice in the pic below the lock symbol on some lines. Locked lines are dim, and you have to be careful to note if they are selected or not. Unlocked lines are either bright blue if selected, or dark if not selected. But locked lines are somewhat dark blue if selected, and quite dark if not. The lines with the lock symbol correspond to the entries in the locked line in the RealityXP.GTN.ini file.

 

Edited December 29, 20214 yr by ark

This is exactly how mine looks to a T. Once I get home I’m going to input your entities to see if that unlocks them.