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Re: [Discuss-gnuradio] TVRX tests in narrowband applications

From: Matteo Campanella
Subject: Re: [Discuss-gnuradio] TVRX tests in narrowband applications
Date: Wed, 8 Mar 2006 09:41:25 +0100 (CET)
User-agent: SquirrelMail/1.4.4

It just happens I've got some MGA62563 from Avago (former Agilent) - those
are MMIC on steroids: 0.8dB noise figure from 50 to 1300 MHz, 22db gain -
5v supply, very simple polarization circuit. Let's see how it performs.

Given the very low intermod characteristic of the MMIC, i'll try without
filtering to start with, eventually adding some notches on broacast FM and
TV bands.

> I strongly recommend buying an external LNA  (HEMT or GaAsFET) and placing
>   it right at your antenna.   Such LNAs have gains of around 15-25dB,
> and noise
>   figures usually around 0.5-0.8dB.   Cable losses for a 100ft run will
> be around
>   3-4dB.   There's no point putting a low-noise amplifier on the front
> of your
>   TV-RX, unless the feedline run to the antenna is very short (less than
> 1ft or so).
> --
> Marcus Leech                            Mail:   Dept 1A12, M/S: 04352P16
> Security Standards Advisor        Phone: (ESN) 393-9145  +1 613 763 9145
> Strategic Standards
> Nortel Networks                          address@hidden

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