On Sun, 21 Dec 2008, Christopher K. Greenhalgh wrote: > It will be a high-profile machine...probably running around 30-40% TX > duty cycle...possibly more during certain times.
Well, you're out of what the manual specifies the duty cycle of the radio to be. Accordingly, you should look at turning the transmitter power down to extend the service life of the radio. > My first question is about cooling. It, along with a 35 amp power supply, > will be located in a gutted Motorola repeater cabinet, which has 4 large > ventilation grills on each door (2)...should I be concerned with > supplemental cooling? I mounted two 1/2" 5" fans on two of the "windows" of the mid-size base cabinet. That being said, our repeater presently has a duty cycle of 1%. But we're also in an air-conditioned space -- is your digipeater going to be located in a similar space, or is it at whatever temperature the room is at (-40 or 140 degrees F)? If the Spectra is close to the rating of the Syntor X9000, you should be able to turn the PA down to 55 watts and let it run. However, the X9000 has the notable distinction of having approximately 35 watts of heatsink area, and only the 30/50 watt radios can be run at 100% duty cycle (assuming no further derating due to elevated room temperatures). > And second, anybody have any information on how to go about adding an > S-meter to the Spectra? Get a manual. =) There's some way through hacking to enable an RSSI function on the Spectra, but IIRC it doesn't work in a non-trunking mode and requires very specific firmware in the radio (MLM). But that also assumes that you want to view RSSI at the radio's control head, not remotely. -- Kris Kirby, KE4AHR <[email protected]> But remember, with no superpowers comes no responsibility. --rly
