[time-nuts] Re: Best frequency to start for GHz synth ?

[Lux, Jim]

On 4/1/21 4:49 PM, Bob kb8tq wrote:
> Hi
>
> At least back when I did it for a living …. the SAW you used
> for an oscillator was a bit different than the one you used for
> an oscillator. The “normal” problem was coming up with
> enough tune range cover the (massive) TC plus the aging.
>
> Bob



Yeah, for filters, SAW devices are awesome. You've got a lot of control 
over the passband and stopband shape.  And they are cheap to make (at 
least for ordinary aluminum transducers on the substrate, with no ion 
milling).

for resonators - the big TC is an issue. And I don't know how high the Q 
can be. I worked for a place that used SAW resonators (on quartz) as 
sensors for all kinds of things (a multitude of SBIRs) - pressure, 
chemical presence, etc.  you name it. Bend the quartz or change the mass 
loading, and the frequency changes, in a fairly repeatable way.  They 
make a nice detector for the output of a Gas Chromatograph for instance 
- they're basically sensing mass, so they don't have poisoning problems 
like some others.


>
>> On Apr 1, 2021, at 7:40 PM, Gerhard Hoffmann <ghf at hoffmann-hochfrequenz.de> wrote:
>>
>> OOps, the 400 MHz filter is
>>
>> < https://www.digikey.de/product-detail/de/qualcomm-rf360-a-qualcomm-tdk-joint-venture/B39401B3742H110/495-3923-1-ND/1858979 >
>>
>> Gerhard
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