[Amps] exciter compression ??

ka1xo at juno.com ka1xo at juno.com
Sun May 16 17:34:55 EDT 2004


Dear Dan,

In our current project of adding Multi Carrier Power Amplifiers to Base Transmitting Stations we are dealing with just about the same issue you speak of in your post.

The exciter radios in the BTS bays emit sometimes 42dB in the pass band and around that in the out-of-band spectrum we signify as "noise." The amplifiers we use have a maximum of 45dB passband input and 42dB noise input, and our output needs to be (in most cases) 44dB passband, -50dB noise.

The units have a voltage-variiable attenuator in the input line that we use to fine tune the setup. However, in certain high-RF noise situations we supplant the VVA's with resistive attenuators, most of them manufacured by NARDA. The beefiest one I've seen deployed was a 30dB, 150 watt unit with heat fins that warmed up well during use.

I might suggest the same for your application so you will be able to achieve your transmitting objectives with the least amount of effort.

Sincerely,

Hal Mandel
KA1XO


More information about the Amps mailing list