IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM

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Frequency issue

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=1897
Printed Date: 12 Mar 2025 at 9:17am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Frequency issue

Posted By: Jrlumpp
Subject: Frequency issue
Date Posted: 23 Nov 2019 at 11:49pm

I’m having a problem with my pre set frequency list on my 550. I have loaded approach control 125.970 in my list. When I activate this preset, it loads this number but in five seconds it , on its own changes to 125.965 , a Non working com frequency. This forces me to type the 125.970 manually then activate it. If I do it that way the number doesn’t change, yet from the preset list it flips to a close number after a few seconds.

Has anyone encountered this issue?

John

Replies:

Posted By: Leonard
Date Posted: 29 Nov 2019 at 7:29pm

No, but I have had recent experiences with the com/nav frequency box’s Xed and it took several on/off cycles to straighten out

Posted By: chflyer
Date Posted: 30 Nov 2019 at 5:29am

Leonard wrote:

I have had recent experiences with the com/nav frequency box’s Xed and it took several on/off cycles to straighten out

For the past few months I get this on my IFD440 on almost every startup, plus the No Com with VHF message. Sometimes multiple power cycles gets rid of it, mostly it disappears after 5-10 minutes and VHF com works again normally.

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Vince

Posted By: Leonard
Date Posted: 30 Nov 2019 at 8:34am

startup, plus the No Com with VHF message

Posted By: AviSteve
Date Posted: 30 Nov 2019 at 9:07pm

Jrlumpp wrote:

I’m having a problem with my pre set frequency list on my 550. I have loaded approach control 125.970 in my list. When I activate this preset, it loads this number but in five seconds it , on its own changes to 125.965 , a Non working com frequency. This forces me to type the 125.970 manually then activate it. If I do it that way the number doesn’t change, yet from the preset list it flips to a close number after a few seconds.

Has anyone encountered this issue?

A few questions/issues here...

1. Is your radio configured for 8.33 or 25kHz spacing?

2. 125.970 is not a valid frequency in either 8.33 or 25 kHz spacing. Did you mean 125.975?

3. Looks like our com frequency preset list will accept 125.970*, though the radio will not tune it. That's why you see the radio time out back to 125.695 (assuming your radio is in 8.33 kHz mode).

* That's a bug and we'll fix it (though it likely will not make it into 10.2.4.1).

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Steve Lindsley
Avidyne Engineering