MASTR II's on 900 MHz

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John G
Posts: 3
Joined: Tue Jan 22, 2002 8:00 pm

MASTR II's on 900 MHz

Post by John G » Fri May 31, 2002 2:08 pm

Thought you might like to know. The MASTR II 800 MHz exciter from the base/repeater will tune to the lower end of the 902-928 band with no component changes. I think more output power could be obtained by trimming the helicals in the output stage slightly. It only takes -20 DBm in at the channel element socket to drive it. This opens up possibilities for using direct digital synthesis for frequency agility. The receiver from a mobile should also pull up with little difficulty. The one I have from a repeater won't due the the L.O. chain being for 806-824 MHz. The casting seems to tune fine. As soon as I can lay hands on a mobile, I will try it. Next, I will try to get the exciter into the upper part of 902-928. The receiver has really been the problem for me. Most 900 commercial radios don't have a front end that will tune 902. If anyone has more info, I would like to see it.

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