LF: SL6440

[Dick Rollema <dickrollema@casema.nl>]

To All from PA0SE

Claudio, IK2PII wrote:

SL6440 is a good mixer, low IMD but high noise. For HF
receiver it 
require a preamplifier also for 7 MHz band.

I don't agree.  I my own homemade transceiver (see RadCom,
Technical Topics, October 2004) I use the SL6440 as the first and second
mixer.
Between the antenna and the first mixer is a fixed tuned Cohn  bandpass
filter with four tuned circuits for each of the bands 10 - 160 m (9 in
total). The insertion loss of these filters depends on the band selected
and is 2.2dB on 10m.
I find that with a good antenna a preamplifier is only required on 10 and
12m in order to make the noise from outside override the receiver
noise.

73, Dick, PA0SE