[Test-Equipment] HP8640B low output level.

[John Miles]

I probably would not use a MAV-11 for this purpose nowadays.  It's an older
part and may not offer as much gain as you need.

It might be worth looking at a newer MMIC such as the GALI series on the
second page at http://www.mini-circuits.com/dg03-166.pdf .

Regardless of what MMIC you choose, an RF choke with good broadband Q and a
high self-resonant frequency is needed to maintain flatness and stability.
You can use a resistor by itself, but it's better to have one or more chokes
in series with it.

-- john, KE5FX

> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net
> [mailto:test-equipment-bounces at mailman.qth.net]On Behalf Of ma yu
> Sent: Wednesday, November 30, 2005 9:30 AM
> To: test-equipment at mailman.qth.net
> Subject: [Test-Equipment] HP8640B low output level.
>
>
> My HP8640B's hybrid model(pre-amplifier) failure, I replace it with  a
> MAV-11, but i find that in 300-450MHz range ,low ouput level,(max output
> only 0.2V), other frqency seems OK .could someone can help me?
>    Thanks in advance
>   Hsu
>
>