To: rsgb_lf_group@blacksheep.org References: <145.340b5ab9.2e7c7f7e@aol.com> Date: Fri, 17 Sep 2004 20:08:19 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SPF-Result: relay.thorcom.net: 195.80.0.234 is neither permitted nor denied by domain of southsurf.com X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.809,HTML_MESSAGE=0.001,RCVD_IN_SORBS=0.1 Subject: Re: LF: SL6440 / mixers Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

I have used to SRA-8 in an LF receiver and found no problems whatsoever with signal handling. It is a standard level 7 mixer, (optimised for 7dBm Lo drive) so will have a 3rd order output intercept around teh 17 to 20dBm mark. From what I recall of teh SL6440 it had a comparable performance. I had quite a few used SRA-8 devices from a surplus source, but certainly woulkdn't dream of buying one when there are many better mixers around much cheaper.

I did once make some measurements using an FST3125 bus switch in a simple a double balanced mixer. At 10MHz measured an IP3 figure near to 40dBm - seriously better.

Andy G4JNT

----- Original Message -----

From: G0MRF@aol.com

To: rsgb_lf_group@blacksheep.org

Sent: Friday, September 17, 2004 6:57 PM

Subject: Re: LF: SL6440 / mixers

In a message dated 17/09/2004 14:14:54 GMT Standard Time, jcraig@mun.ca writes:

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

If it's strong signal performance you are looking for ( small sig + CFH) then perhaps an H mode switching mixer would be a good choice. The IP3 and balance should be spectacular at <1000 kHz.

73

David