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RE: H mode mixers at 144 MHz
- Subject: RE: H mode mixers at 144 MHz
- From: Leif Åsbrink <leif.asbrink@xxxxxxxxxxxxxxxxxxxx
- Date: Sat, 31 May 2003 23:28:53 +0200
> Giancarlo did some tests with his H-Mode HF mixer at 144
> These tests demonstrate the H-Mode Mixer could be used
> at 144-148 MHz. Need to do some studies on
> transformers cores (suggested #61 = mu 125) and
> numbers of turns to improve mixer attenuation.
> I hope there are some friends of the Linrad list that
> will tackle trial test at 144 MHz.
> ----end of Giancarlo's message
> And now to try and find some time to play with these new
> mixers ;)
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?
Leif / SM5BSZ