At 1/3/2010 04:37 PM, you wrote: >Well speaking of cold we have a MVP remote RX which is a duplexed 2 >meter rx to 70 cm tx that is in a elevator room on top of a 15 story >building and that room is largly at near ambient temperature and now >with the cold seems slow to come up. The elements were temp compensated >etc and I really don't think that it is coming up off frequency. If >anything it seems it there at extremely low power but not confirmed at >this point. The site is in a secure site so is hard to get access to >for testing. What thoughts does anyone have on this.
If you have the power turned down on it (such as for driving an external RFPA), the power level will drop with colder ambient temperature, but will eventually come back up if the TX is kept on for a while. I have 2 on a mountaintop site (0 to 100 °F ambient): one duplex link & one repeater. The repeater radio runs at full power & I never have any power issues with it. The link is set to around 3-4 watts, & when it gets well below freezing it takes a couple of seconds for the TX to make enough power to establish the link. Bob NO6B
