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The best place to get user manauls for any 2-way radio is to join yahoo group specific to the brand and model of your unit, there they will give you advice and lots of useful info for your radio and freely downloadable items including user manual.
I don't know if you've found an answer to your query yet, but here goes: Q1.Dowload the user manual, if you don't have a copy. Q2.How do you obtain a copy? Q3.Read instructions CAREFULLY, very tricky for a novice. A1.Join yahoo group specific to the BRAND/MODEL of your unit or www.uniden.com and follow the links A2.As above A3.The manual describes in plain english the steps required under direct entry programming. These units are the best uniden has made, especially for listening to P25 comms, if you're into that kind of listening.
I hope this is helpfull, I would have given you programming instructions myself, but it's quite involved and we don't have the space here.
Here is a direct link to the user's manual for your model:
http://www.uniden.com/pdf/GMR648-2CKom.pdf To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.
You may need ADOBE READER installed on your computer to read PDF documents. You can download this free at WWW.ADOBE.COM if necessary. Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, the follow the onscreen instructions to install the software on your computer.
The range of the units is quoted as being up to 6 miles. See the top of page 1 in the manual. This may be possible under absolutely ideal conditions with fully charged batteries, elevated positions, and a clear line of sight between the units. The practical range however, will certainly be much less. Trees, buildings, or hills in between the two units will dramatically reduce the effective range, as will low batteries.
I hope that was helpful to you, good luck. If you choose to rate this solution using the Thumbs Up scale provided, I thank you very much for your time and consideration.
Haven't been able to locate a user guide for the multi-unit charger. However, it is pretty much plug-in-n-play. It can charge a battery inside a radio, or also accommodate a battery alone in each of 6 cups. As for replacement parts, they are not available, and you cannot purchase the multi-unit tray separate from the power supply. This is a slow rate charger and would take 10 hours to charge your batteries (or overnight). Radios/batteries should only be placed on the charger when nearly depleted. (Consider your charge a place your radios go to bed overnight.)
If you are having difficulty with charging, clean your battery contacts on the exterior of the radio and inside the charger cups with a pencil eraser.
You are describing an open squelch. If this unit has a squelch control, adjust it until it quietens.
If the battery voltage drops below a certain point, it won't squelch. That could be caused by a battery that needs to be charged or a bad battery that won't charge up correctly.