Tom Rowley wrote:
> Cecil
>
> What is the part number for the AMD device?
>
> Tom
> W2TER
>
>
> ----- Original Message -----
> From: [EMAIL PROTECTED]
> To: [email protected]
> Cc: [EMAIL PROTECTED]
> Sent: Thursday, September 14, 2006 12:38 AM
> Subject: Re: [soft_radio] Re: New file uploaded to soft_radio
>
>
> Cecil
>
> Ok this is somewhat encouraging, I must take stock of what looks like
> might stop being manufacured in the future. SMT is ok, I have found
> some neat little boards called Surf Boards that can come in handy when
> with SMT and the breadboard. In turn chips mounted on them can then be
> treated like a DIP IC in terms of ease of use in a finished board.
> Folk might like such chips premounted and someone can make a few sales
> with them that way.
>
> Dan
>
> "Dual gate FETs should work just fine, back some time they were
> considered the cat's meow since they worked so well, they could handle
> large signals without distortion (high IP3) especially when used in a
> balanced circuit. While being a mixer they can also provide gain.
>
> They are a little hard to get since very few are made anymore, they were
> excellent for a receivers RF/IF amplifier since changing the bias on the
> second gate could be used to control the gain of the device, and are by
> nature very low noise devices.
>
> Their big gotcha is that they are incredibly sensitive to static, so are
> easily damaged, I would solder them in place before removing the little
> wire that was wrapped around the pins
>
> The SA612A will also work fine also as long as you stay within the chips
> input level. By they way I read that they no longer manufacture the DIP
> package versions, they now only make the SMT version so enjoy them while
> you can, I have about 20 in stock, they are handy little devices.
>
> AMD makes a much better version that sports two mixers and a built in
> Quadrature clock generator. You feed it a clock at 2X the receiver
> frequency, and it generates the Quadrature clocks for the mixers inside,
> it also has a much higher IP3 figures of +19dB, it cost around $4.00,
> it's available in SMT only.
>
> Under 20M I prefer switches, but any kind of mixer will work, just some
> better than others. Here is a schematic of a receiver with I/Q audio but
> uses a Diode Balanced Mixer, there are all kinds of possibilities out
> there;
>
> < http://www.hpsdr.com/Public/Parts/Clock/TMschematic.pdf>
>
> Too much fun and not enough time." ....Cecil KD5NWA
>
I'll have to look it up this weekend, I have several but I have not
tried them out. Mind you it's not a replacement for a SA610A, but is a
high performance dual version of something similar. The packaging is the
pits is has no pins of any kind just little pads underneath the IC you
have to use an oven to solder it.
--
Cecil
KD5NWA
www.qrpradio.com www.hpsdr.com
"Sacred Cows make the best Hamburger!" Don Seglio Batuna
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