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| To: | LF-Group <[email protected]> |
|---|---|
| Subject: | LF: SL6440 |
| From: | Dick Rollema <[email protected]> |
| Date: | Thu, 16 Sep 2004 17:33:07 +0200 |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
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 |
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