In your application the third order intercept point is probably more important than gain or noise figure. If there is to much gain you can always add an attenuator to the output. Depending on the quality of the radio you are using a pre amp may or not help in your application. That said I've been pleased with the UHF ARR gasfet preamps and if I was looking for a VHF one I'd look at ARR as well. Good luck Mark, VE7AFZ
--- On Mon, 11/3/08, ANTHONY JAPHA tjjapha@earthlink.net wrote:
From: ANTHONY JAPHA tjjapha@earthlink.net Subject: [amsat-bb] Preamp advice, pse To: amsat-bb@amsat.org Received: Monday, November 3, 2008, 6:45 PM
Bird Lovers, Pse let me have advice on which of the following ARR 2 mtr preamps I should get: P144VDA: 1.0db nf, 15 db gain; or P144VDG: 0.5db nf, 24db gain.
The preamp will be used primarily for AO-7. I operate only portable in a high noise environment here in Manhattan. I doubt the nf difference is at all meaningful in my use. The large difference in gain between the 2 preamps may not be impt. either, that is the real question. My XCVR is the FT-817. Another 817 is used to transmit, running abt 15-20 watts into a small amp. with an Arrow split between 2 booms on 2 tripods only abt. 1 ft. from each other.
So what's the verdict?
Tnx and 73, Tony, N2UN
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