I get live radio reception in the background of my avr-1513 reciever

disconnect speakers then try again if still shutting down you will have bad outputs.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

The owners manual can be found at many sites on the internet if you google for Denon AVR 1513. One site is amazon.com.

http://s3.amazonaws.com/szmanuals/d357e31200b1de2a76b2e5619ef9cdd8

there is already a thread at AVS forum for Denon AVR owners in which other users interact with each other, probly they can help you find the schematic

http://www.avsforum.com/t/1409431/the-official-denon-avr-xx13-model-owners-thread-faq

Check its speaker connections. Check the speaker using a dry cell. If it is found OK, check the sound settings. If you wish to get more details, check this link.

Plug the speaker wire from the speakers themselves directy to the receiver or you can plug them into the acoutimass module and the module into the receiver using speaker wire.

Sounds like you could have a bad speaker connection. Try disconnecting the speakers and see if it stays on. If so, connect one at at a time until it goes off to determine which one.

Could be a lot of background noise.
Could be no one near you.
Could be RF GAIN down.

standing wave does not effect receive, it only effects transmit. If you are sitting still some where, you could be in a hole. Depending on where you live there could be a lot of background noise, RF interference. For instance Staten Island is known as "Static Island" because of all the RF interference.

Where you are at, it may be a fact of life.

what kind of car are you driving. on some cars the antenna need to be extended in order to recieve am reception.

The front end is bad on this reicever. Your going to need special equipment to trouble shoot this problem, as Its all RF. It is most likly not worth repairing as a shop will most likly charge you more then its worth