Troubleshooting ADF

[Tommy]

Lately I have noticed my KR-87 ADF *gasps - what the heck is NDB?!* is playing up a bit. It's now spins around haphazardly as if it's hunting the station (I tried various stations but getting the same result). No issue listening to the mose code and it points to right wing when it's in ANF mode (normal). Resetting it with CB didn't do anything. 

Wonder what would cause this? It was working fine two months ago. 

I know it's an old technology but it's still part of commercial syllabus here in Australia 

[Marauder]

Lately I have noticed my KR-87 ADF *gasps - what the heck is NDB?!* is playing up a bit. It's now spins around haphazardly as if it's hunting the station (I tried various stations but getting the same result). No issue listening to the mose code and it points to right wing when it's in ANF mode (normal). Resetting it with CB didn't do anything. 
Wonder what would cause this? It was working fine two months ago. 
I know it's an old technology but it's still part of commercial syllabus here in Australia 

Do you have the combined antenna or the one with the long sensing wire? I would make sure everything is grounded properly. Also I seem to recall my ADF days pulling the unit from the rack and reseating it to solve sensing problems.


Sent from my iPad using Tapatalk Pro

[Tommy]

I have a combined antenna at the belly. Yes that will be my next step - reseat it after give the contacts a bit of clean! 

 

[Piloto]

21 hours ago, Tommy said:

I have a combined antenna at the belly. Yes that will be my next step - reseat it after give the contacts a bit of clean! 

 

Clean also the contacts at the antenna connector.

José

[Tommy]

I have got two antennae under the belly, how do you tell which one is for ADF?

2 minutes ago, Piloto said:

Clean also the contacts at the antenna connector.

José

 

[Piloto]

3 minutes ago, Tommy said:

I have got two antennae under the belly, how do you tell which one is for ADF?

 

The Stormscope and the ADF antennas are similar in appearance. Just clean both.

[DVA]

Tune the ADF to a quiet frequency and turn up the volume. Go to the two antennas with a small fluorescent trouble lamp. Please it next to the antenna and listen for buzzing. You found it.

[Tommy]

I tried reseating it today. No luck. Going to clean the antenna instead! I used to but now I can't pick up the AM radio stations unless I press BFO and turn the volume right up and even then it's very faint. 

Does it point to an antenna problem?