A common problem in GTX's is output power fluxuations. Usually it appears that the final amplifer is not engaging. This behavior is different from radio to radio and between different frequencies. The reason is the power control circuitry uses an algorithm based on the test frequencies stored in the radio. Since 902 is very close to the original range, it works OK. With 927, it is getting messed up because that frequency isn't close to one of the test frequencies. The simplest cure to this problem is by cloning in a code plug from another GTX that didn't exhibit the problem. Posted: Tue Sep 07, 2004 1:30 pm Post subject: GTX mobile power problems fixed I have fixed the low power problem at 927 mhz on both hi power and lo power (M11WGD and M11WGJ) GTX's by cloning in a codeplug from a radio that does not exhibit the problem. If anyone else wants to try my fix email me for the codeplugs. Chris N9LLO@aol.com After you get the "magic" code plug, you need to clone it into your GTX mobile. The RSS will want to also see system ID file. Without this special file, you will not be able to clone your radio, even when cloning its own code plug. RSS will just refused to go further. Quite annoying. The system key file will have to go into a specific directory/folder and have a specific name. Somehow this encoded file contains the system ID and other stuff RSS needs to make sure you really are allowed to change every field in the trunking info sections. Without it, you can't change any trunking info or perform a cloning operation. With this key file, the cloning should go fine, radios tested put out equal power on 927.4875, 927.5000, and 927.6000. Other reprogrammed channels to ones liking and have tested been tested on a service monitor. They put out about 11.25 watts +/- 0.25 watts on all the channels one person tested. Deviation is relatively consistent as well. Relevant Files: A867FBJ0.108 is the low power (12 watt) code plug while A867YCN0.051 is the high power one. SYS00001.KEY is obviously the system key needed to clone in these code plugs. GTX.MDF is pre-hacked for ham use. file is for version 4.00.01 ---- 902 Ham Band ----- 896.0 941.0 - Range 896.0 928.1 - TX 902.0 941.0 - RX/TA Checsum 73F0 http://groups.yahoo.com/group/AR902Mhz/ http://groups.yahoo.com/group/900mhz/ http://mailman.qth.net/mailman/listinfo/33cm http://www.geocities.com/aa2ls/gtxnotes.html http://www.bluefeathertech.com/kc7gr/gtx.html http://www.batlabs.com/gtx.html