Would it be of any value to use a Si5351 module
like the Adafruit module ($7 from them or Mouser or Digikey) or a
homebrew one like VK3PE makes that is a drop in replacement for
the Adafruit
Yes,? the Si5351's are 10 pin smt devices but they are about $2.25
each in small quantities and seem to be used a lot these days or
you could buy the Adafruit module that is already soldered for
you.? A cheap mechanical encoder could also be used with them.?
Yes that does complicate the design by requiring that a PIC chip
or Arduino chip or module also be included in the design but I
would guess the parts for something like that in a simple DC
receiver would be around $25.? Adding a display would drive the
cost up and complicate it but is a display really even needed?? I
would suspect that there is a way to set the frequency range of
the module without using a cpu but I do not know what it is.
Thank you.
Jim Pruitt
WA7DUY
On 12/10/2019 2:58 AM, Chuck Carpenter
wrote:
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Jerry,
I get about 3 kHz with a pair of crystals on 7MHz using the
"fixture" in the picture.? I measured that with a 10V tuning
range.
The SA612?oscillator is running from the 6V regulator circuit so
the frequency isn't affected by supply voltage changes.
The GQRP Sudden RX kit uses a VFO for tuning.? You could take a
shot at that using those 9mm cans...8^)
They take a lot of space.? I built one of those?for someone and it
seemed to be fairly stable.? I found a source for?new cans but
they are rather pricy.
The RX for my project was intended for installation in mint tins
as shown in sketch pic.???
--
Chuck, W5USJ (ex K2OFN)
Point, Rains Co, TX? EM22cv
