ArthurLekstutis wrote:
> Did you mean Analog Devices? Specifically the AD8333? Looks very
> interesting:
> www.analog.com/en/subCat/0,2879,770_849_0__0_,00.html
>
> Artie Lekstutis
> KC2MFS
>
>> 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
>>
That is one of them, there is also another one that I also have some in
my stock from another company, but I can't remember who made it, I have
the specifications on my home computer, or at least I was there before.
Lately I have been going through computer hell, I have lost 4 computers
due to flooding, or lightning in the last six weeks. Because of it I
have lost a lot of data and emails that I had collected.
--
Cecil
KD5NWA
www.qrpradio.com www.hpsdr.com
"Sacred Cows make the best Hamburger!" Don Seglio Batuna
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