Batboard

I have a UHF (403-470) CDM1250 mobile that I'm trying to convert a vehicular repeater.

I am aware of the low power setting in the CPS... The lowest I can put is 20 watts.

Is there a way I can lower the RF output to around 1-2 watts?

Thanks for the ideas.

no, they won't go that low, they wouldn't even like to go down to 10 watts.

What? I have no problem going to the Radio Configuration -> TX Power tab and setting the power all the way down to 10 watts. I have done this on a CDM1250 and CDM1550LS+ used in a base station setting at 12 watts. CPS lets me go all the way to 1 watt.

I would not recommend turning the power down to 2-4 watts, although I have seen it done by others.

Weird, my CDM1250 low setting only goes from 20 to 54 watts. I wonder if firmware or cps versions dictates how low the radio will go?

Must be some differences between firmware or CPS releases?
CPS 6.04 allows me to go right down to 1 watt, with the all the different CDM1250's and a 1550 I have kicking around, on both VHF and UHF models

when you take the low limit down below 20 it jumps back up to 54 and when you enter a number lower than 20 manually it won't take it. i'm using the newest 6.09 cps and the newest firmware right now but i've had this happening for a long time that it wouldn't let me go below 20. is the cdm you are doing this on a low power 25 watt unit to start with? those will go down to 1 watt but the 45 watters won't do that? i'll bet the model you got that to do that on has a "h" for the 7th digit, the "k"'s will not do that.

Model # AAM25KKD9AA2AN ---> 7th letter K, and this is a 20 watter on low, but 52 on high.

It has nothing to do with CPS or firmware. The "low powered" CDM will adjust from 1-25 watts in UHF and I believe 1-30 watts in VHF. The "high powered" CDM will adjust from 20-45 watts (maybe 50 in VHF?). If you need low power, get a low powered CDM...they are better suited than Maxtrac/GM300 style radios as they won't get spurrious when putting out less than approx 5 watts.

Todd

Thanks for the feedback guys.

Well, I have a high powered CDM1250 (UHF) so that answers my question.

Looks like I'll need to hunt down a low powered version for my purposes.

PS if anyone wants to swap one with me; let me know.

Thanks!

wavetar wrote:It has nothing to do with CPS or firmware. The "low powered" CDM will adjust from 1-25 watts in UHF and I believe 1-30 watts in VHF. The "high powered" CDM will adjust from 20-45 watts (maybe 50 in VHF?). If you need low power, get a low powered CDM...they are better suited than Maxtrac/GM300 style radios as they won't get spurrious when putting out less than approx 5 watts.

Todd

Not being picky Todd, but the UHF CDM1250 we have in service here is variable from 1-30 watts, not 1-25, not that it makes a lot of difference though....