How do you program RDU2020 And Change the Freq and Clone them.

read your manual Motorola RDU2020 RDX UHF Radio Owner Manual

They are found here on the Motorola RDU2020 spec sheet
http://www.twowayradiosfor.com/pdf/RDU2W_MSRP_112807.pdf

Here is a link to the user guide (click the link)
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The best method is via software and cable. The software is available from Motorola for free at the following link (look in the lower right corner)
RDU2020 Two way Radio

Out of habit, after I clone a radio, I turn it off before transmitting. I think it does a reset and saves the information. So, do that, turn it back on and try again. If the problem persists, try manually or with the software programming it. If it still will not save the information, the radio is in need of repair. Please post if this worked.

Here is a link to the RDX series page at Motorola, in the lower right corner there is a link to the user guide for your RDU2020 radio. In the user guide there is a very good explanation of matching the XU2100 to the RDU2020. The RDU radio was the next model in line after the XU2100 and was designed to work with it. http://www.motorolasolutions.com/US-EN/Business+Product+and+Services/Two-way+Radios/On-site+Business+Radios/Discontinued/RDU2020_US-EN

Here is a link to the RDX series page at Motorola, in the lower right corner there is a link to the user guide for your RDU2020 radio. In the user guide there is a very good explanation of matching the XU2100 to the RDU2020. The RDU radio was the next model in line after the XU2100 and was designed to work with it. http://www.motorolasolutions.com/US-EN/Business+Product+and+Services/Two-way+Radios/On-site+Business+Radios/Discontinued/RDU2020_US-EN

Here is a link to the user guide http://www.weatherconnection.com/manuals/CLS1110.pdf
Refer to pages 28-29.

Best regards.

1) You possibly have a bad or nearly dead battery. Transmit takes more energy than receiving. With this in mind, your radio's transmit will fail, if you have a poorly charged or bad battery, when pressing the PTT. Try a battery from a known good radio to see if it eliminates the problem. If so, replace your battery.

2) The radio is either programmed incorrectly or in need of repair. If you have been experimenting with the programmable features, we suggest you walk back through the steps of programming. Here is a link to the user guide: http://www.mytoolstore.com/motorola/rdx_userguide.pdf Programming instructions begin on page 36.

3) If in need of repair. Radios less than one year old should be under warranty, barring any physical or water damage to the unit. Contact the place of purchase or Motorola for warranty instructions.
If the radio is more than one year old you can get it repaired at any dealer offering Motorola repair. (approx. $85 flat rate)

Best regards.

Hold down the 88/pri and the DW buttons while switching on the radio into programming mode. You'll then need the programming soft and hardware to read the radio., add the 27mhz channels and write it back to the radio. The GX300 can only store additional freq. in the p1-p0 modes

its a mexican kraco clone,lol