----- Original Message -----
From: "Joe Craig" <[email protected]>
To: "LF-Group" <[email protected]>
Sent: Friday, September 17, 2004 4:13 PM
Subject: Re: LF: SL6440
Dear LF Group,
I have been considering purchasing the SRA-8 for the first mixer in
a new LF receiver I am designing. This is a passive DBM and is
fairly expensive. Would I be better off using an SL6440?
73
Joe
Hello!
I have succesfully used the SL6440 mixer in two LF receivers.
First, this active mixer is, although being a bit noisier than a diode mixer
(probably by maybe 3 dB) adequate for LF with respect to noise.
Secondly, it it provides some gain (10 dB or so) instead of the 6-8
dB conversion loss of a passive diode mixer.
Last, but not least, it is satisfied with an oscillator drive of about 1 mW.
The SRA-8, which I assume is a type 2 or type 3 mixer, will require
13 or maybe 23 mW of oscillator drive.
I think the signal handling capability of the SL6440 is comparable to that
of a class 3 diode mixer. Depending on a current setting the third order
intercept
point will be better than 20 dBm.
But even a good mixer as the SL6440 (by the way: wasn`t this device designed
by
G3RZP?) deserves a decent preceeding bandpass filter!
73
OZ8NJ Niels+
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