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

[Edson Pereira <edson@xxxxxxxxxxxxxxxxx]

Hi Kohjin,

According to the information published in the ARRL Experimental Methods in
RF Design, the H-Mode mixer is the work of Colin Horrabin, G3SBI, and the
H comes from the resemblance of the letter H in the mixer schematic
diagram.

73,

-- Edson, 7n4ncl

On Sun, 1 Jun 2003, Kohjin Yamada wrote:

> 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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