All connections are good it has power and ground antenna is connected properly but i still can't send or receive what can I do to remedy this problem?

Question edited for a lot more clarity.
Question moved to model category.

Troubleshooting help, but better to take the vehicle back and ask why the unit no longer works?

Unable to receive stations.
• No antenna, or open connection in the antenna cable.
- Make sure the antenna is properly connected;
replace the antenna or cable if necessary.
Unable to tune stations in the seek mode.
• You are in a weak signal area.
- Make sure the tuner is in DX mode.
• If the area you are in is a primary signal area, the antenna may
not be grounded and connected properly.
- Check your antenna connections; make sure the antenna is
properly grounded at its mounting location.
• The antenna may not be the proper length.
- Make sure the antenna is fully extended; if broken, replace
the antenna with a new one

In Case Of Difficulty - Alpine IVA-D300 Owner's Manual

https://www.manualslib.com > ... > Owner's manual
Alpine IVA-D300 Manual Online: In Case Of Difficulty. ... If the unit is still not functioning normally, please review the items in the following checklist.

Contents - Alpine USA

https://vault.alpine-usa.com > OM IVA-D300
PDF
Selecting the Channel directly . ... Make sure the IVA-D300 will not be installed in a location ... Do not use commercially available disc accessories.

Check your antenna. Make sure it is getting a proper ground. If mag mount; make sure base of antenna and where you put it are both super clean. Check where whip goes into coil or base. Make sure all allen screws are tight and whip is not either all the way down to the base or up to the top. If antenna is mounted; make sure that it has a good ground. You might have to remove some paint around the base to get a good connection. DO NOT TRANSMIT WITH A HIGH SWR. YOU CAN BURN OUT THE EXPENSIVE POWER OUTPUT TRANSISTOR. Hope it helps.
Tom

G'Day
The AM loop antenna needs to connect between the terminals marked as "AM ANT" and "GND" on the rear top right corner of the amp. This is the normal configuration for a loop antenna. The other option(not using a loop antenna) is to connect "GND" with a single insulated wire to a decent earth connection (2 m copper stake hammered into the ground or a water pipe, and a single wire elevated as long and as high as you can. this style of antenna system is not generally used these days, as the transmission power of radio stations has increased greatly over the years so that a small loop antenna will do the job So, most stations should be tunable with just the loop, remember however, that it will be directional. If the loop is in proximity to other electronic gear, it may not perform as well. Keep it as far away from the rest of your gear as you can.
You will generally get no AM stations AT ALL until you have connected the loop to both terminals. Happy to talk to you further about this. Please rate my solution. Cheers
regards robotek

jd40,
Sounds like a grounding issue. The first two places to look into is the powered subwoofer and antenna. During your last test, did you leave the FM antenna and subwoofer connected? Many times the hum is directly related to the antenna and/or the subwoofer and to how they are grounded; creating a ground loop through the receivers ground on the outlet. If the antenna is grounded to the dwellings wiring, hum is inevitable and sometime you can get a ground loop hum from how or how & where the subwoofer is grounded. Try taking them completely out of the loop.

Also try taking it further back to the basics, start with the receiver plugged into a known good grounded outlet with no surge or line conditioner in the loop and nothing connected to the receiver, nothing. Use one speaker and different wire to test each speaker output while in tuner and any other mode but phono. With no signal, you will either get nothing (no hum or static) or just static in the tuner mode. No hum is a good sign. Some systems will mute the speakers if no signal is connected to eliminate the static from being produced through the speakers but a ground loop hum will most likely still be produced even in mute. If you get a hum when nothing is connected to the receiver, try looking into getting a better grounded outlet, even maybe to a different dwelling.

-Chris

one of 3 things, either your antenna is not insight of a skies view to receive the signal, or its wire is broken at the antenna, but if you remove the antenna connection frequently it pulls the center wire out of the connection on the end that fits into the radio when its plugged in push on the conductor at the back of the plug and see if this helps,alos if connection is loose take a safety pin and carefully between the outer plug case ans the ground fingers around the center pin push these in so you get a better ground, and lastly try another substitute antenna, I have re-soldered my connections numerous times to fix this issue, delphi doesn't make a very rugged product, good luck

Reception has little to do with grounding. The ground plan is for transmitting. As long as the coax is connected and is in good standing, it should receive fine regardless of grounding.

There are a few reasons you may have bad reception.

1. Turn the RF GAIN all the way up. This is your receive sensitivity.
   
2. Squelch is too high. It should only be turned up enough to cut out the background noise.
3. Poor antenna. If the antenna is cheap, and not made well, this could be the problem.
4. Not enough of the antenna above the vehicle. It needs to be at least 60% of the antenna above the vehicle.

Hope this helps!

The problem is most likely the ground connection of the antenna to the vehicle chasis.

If the body is metal (and not a composite material) the base of the antenna should be grounded to the vehicle through the mount. Usually, the antenna base has "teeth" on it to make a good ground connection to the body. If this mount is not tight or there is paint or rust preventing a good electrical connection, you'll get weak reception.

Charlie

your sure connect antenna is bad that is why you get this message or you have something hooked up wrong check the power and ground on the unit if it has one .... some have it, some dont but most of the time its just a bad wire

hi sounds like a torn ant wire or bad ant change the ANT with all the length wire till the reciver make sure a good connection in the reciver good luck