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

[w3sz <w3sz@xxxxxxxxxxxxxxx]

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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