Any RT-68 gurus here?

[MASH 4077]

Ok I have recently purchased an MT-299 mount for my RT-68/PP-112. The guy I bought my MT-299 mount from said it worked. I got it mounted in the jeep, started checking grounds from the mount to the jeep. It checks out good and the ground also checks out good on the antenna mount. The antenna wire also checks out good on continuity. So I start testing my equipment as far as to see if it powers up. I have two 68's and two 112's. My first power supply, no good. Vibrators are not running and it has a bad relay. I try the second. Vibrators are working and there is now clicking in the RT. So now I move on to sound. I take my loud speakers, and hand sets(I have two of each) to a friend that has a GRC-106. Hook them up and the two speakers work and one handset works. I Hook them in to my 68 and I have very, very little sound. So I thought that the high side of my power supply was out. Got access to another power supply, all the vibrators are humming, lights come on the radio, and I still have very little sound. Any ideas on why it has little to no sound?

 

[NDT]

Have you checked all the filiments using the panel meter?

 

[MASH 4077]

No I have not. Not to sound dumb, but what is a panel meter?

 

[NDT]

The meter on the panel of the RT68. Try to find the TM for this radio, you will need it to do an effective troubleshooting.

 

[MASH 4077]

Sorry, I'm still new to to radios. I do know what you're talking about. When you switch the setting on the meter the needle it up on some and others its not unless you key the mic and then it comes up. Is that normal?

 

[MASH 4077]

I also have TM11-284 which covers GRC-3-8 sets. It should have some trouble shooting on the 68

 

[NDT]

Sorry, I'm still new to to radios. I do know what you're talking about. When you switch the setting on the meter the needle it up on some and others its not unless you key the mic and then it comes up. Is that normal?

Yes that is correct. Try cleaning the contacts in the audio connectors.

 

[MASH 4077]

Ok I will give that a try. I've cleaned them once, but that was just taking a small screw driver across them and not wiping them off. This time I'll wipe them off lol