Date: Wed, 05 Jan 2005 22:03:49 +0100
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From: "Hans-Albrecht Haffa" <dk8nd@web.de>
To: rsgb_lf_group@blacksheep.org
Organization: http://freemail.web.de/
Subject: LF: G3YKB PSK31 copy in Ipswich, analogue mixer with Video-Multiplexer
 or analog switches
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Dear Wolf et alii,

search the internet for H-mode-mixer, there are some proposals of an Italian and Japanese station.


Or just use any fast analog switch with high operation voltage (5V...18V) with fast switching times.  An H-Mode-Mixer is an H-Bridge of an switch mode power-Supply. The disadvantage of theese mixers is that  most of the fast circuits You get only in SMD-Outline at distributors like  Farnell and RS Comonents. Farnell has an interesting Fairchild-Circuit fo this purpose; FST 3125; for Longwave it is possible to use 4066 (CMOS) too.  DJ1ZB has tried it for qrp-circuits.

55,
Hans-Albrecht
DK 8 ND


rsgb_lf_group@blacksheep.org schrieb am 05.01.05 21:47:27:
> 
> Wolf DL4YHF wrote:
> 
> > P.S: Andy G4JNT mentioned a mixer using fast analog switches with a 
> > low on-resistance some months ago, unfortunately I couldn't find the 
> > message on my harddisk. Anybody remember the chip name ?
> 
> Wolf,
>   I don't know which chip was mentioned by Andy, but I have used with 
> great success
> in my SDRadio project the Analog Devices ADG704, with a typical Rdson 
> resistance
> of about 2.5 ohm. The chip is available from RS Components.
> 
> 73  Alberto  I2PHD
> 
> 
> 
> 


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