Re: [linrad] RE: H mode mixers at 144 MHz

[Kohjin Yamada <kohjin@xxxxxxxxxxxxxxx>]

Hi Roger,

Thanks for the very interesting post.
I wonder if there is any website of Giancarlo I7SWX and/or G3SBI?
I have searched in Mr. Google but couldn't reach anywhere.

Who gave the name of "H-Mode Mixer"?
Do you or Giancarlo know of any good webpage to learn H-Mode Mixer?

Kohjin - JR1EDE

At 21:31 03/05/31 -0400, you wrote:
>Hi, Leif!
>
>H-Mode mixers were made with J310's before people started
>using the Fairchild devices, I think.  Given the IP3's of
>40-45 dB quoted, to you think that it would be worth trying
>this at 144 MHz?
>
>
>73,
>Roger
>W3SZ
>
>> 
>> I made some experiments with the NC7SB3157, another member
>> of the Fairchild CMOS switch family. I tried to use it to
>> convert from 70MHz to 10.7MHz but the results were not too
>> encouraging. I do not remember the details any more, but
>> performance was similar to what I could get with the J310.
>> Since the microscopic devices  are awkward to work with I
>> decided to use the J310......
>> 
>> Some day the modern switches will be superiour for use at
>> VHF.  I do not know if the day has already arrived, my
>> tests did not  give good enough IM3 performance but I did
>> not study very carefully  since I do not have the tools to
>> work with these very small components.
>> 
>> Maybe someone will make a PCB with just the mixer on it?
>> 
>> 73
>> 
>> Leif / SM5BSZ
>> 


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