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 f
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
> On Apr 1, 2021, at 7:40 PM, Gerhard Hoffmann
>
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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emai
Poseidon Scientific Instruments (acquired by Raytheon) make a room temperature
10.24GHz Sapphire loaded cavity oscillator with a low PN floor:
https://www.rdi.uwa.edu.au/__data/assets/pdf_file/0012/3447669/Raytheon-TechnologyToday-20141-Extract.pdf
Bruce
> On 02 April 2021 at 05:06 Chris Caudle
Hi
> On Apr 1, 2021, at 2:16 PM, Richard (Rick) Karlquist
> wrote:
>
>
>
> On 4/1/2021 10:32 AM, Lux, Jim wrote:
>
>> And for what it's worth DROs have their microphonic problems too. We had a
>> breadboard deep space transponder and you could demodulate your voice
>> (poorly) using the sp
A bit more contemporaneous... it's too long a story to relate here, but I
discovered that the internal speaker, as well as my voice, tapping on the case,
etc would FM the VCO in the synthesizer in my Elecraft K3 transceiver. This was
a birth defect that affected every one of them. They used my
On 4/1/21 11:16 AM, Richard (Rick) Karlquist wrote:
On 4/1/2021 10:32 AM, Lux, Jim wrote:
And for what it's worth DROs have their microphonic problems too. We
had a breadboard deep space transponder and you could demodulate your
voice (poorly) using the spectrum analyzer's FM demod feature.
On 4/1/2021 10:32 AM, Lux, Jim wrote:
And for what it's worth DROs have their microphonic problems too. We had
a breadboard deep space transponder and you could demodulate your voice
(poorly) using the spectrum analyzer's FM demod feature. Very cool.
Unimpressive to the folks who wanted to p
Lux, Jim writes:
>SAW devices were all the rage in the 80s for signal processing.
Also certain CPUs: Some of the DEC Alpha's had a SAW oscillator
next to the CPU chip to get a sufficiently pure clock-signal.
They had a tempco from hell and were nearly impossible to wrangle with NTP.
On 4/1/21 9:41 AM, Richard (Rick) Karlquist wrote:
1. Whatever the advantage of cryogenic operation, Keysight
could not consider that due to marketing reasons. They
were happy to leave the lunatic fringe to our friends in
Western Australia.
2. They were already limited by microphonics even at
1. Whatever the advantage of cryogenic operation, Keysight
could not consider that due to marketing reasons. They
were happy to leave the lunatic fringe to our friends in
Western Australia.
2. They were already limited by microphonics even at
room temperature, so cryo would be wasted.
3. My
Hey guys--
From a non-engineer civilian, let me express my gratitude at being able to
listening in, as a slack-jawed rube, to your high-end ruminations about "aero
dynamic windows" and "whispering gallery devices," which send me scurrying to
Google. You give this mere mortal much voyeuristic pl
On 2021-03-31 14:27, Richard (Rick) Karlquist wrote:
When I left Keysight in 2014, they were still trying to solve the
microphonic problem in their sapphire resonator oscillator. Also,
it is still necessary to lock the oscillator to a 5 or 10 MHz
OCXO. The oscillator is tuned by varying its ove
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