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 k...@catonic.us
But remember, with no superpowers comes no responsibility.
--rly
