John Larkin wrote>Does anybody know what this is? > >https://www.dropbox.com/s/np4s7ifgg5f4gbz/DSC01841.JPG?raw=1 > >https://www.dropbox.com/s/6ckipx3z8v4nf72/DSC01844.JPG?raw=1 > >Spark gap? Waveguide T/R switch?It is probably one of those fortune telling machines that you have to rotate and then you see the future in it. google does not know that number, you should tell them.
How to select transistor for oscillator ?
Started by ●September 11, 2018
Reply by ●September 13, 20182018-09-13
Reply by ●September 13, 20182018-09-13
> > CK722 was slow, maybe under 1 MHz, but the data sheets didn't spec it. > I think it was a nasty alloy-junction part. > >2N107 my first transistor m
Reply by ●September 13, 20182018-09-13
On Thu, 13 Sep 2018 15:02:14 GMT, <698839253X6D445TD@nospam.org> wrote:>John Larkin wrote >>Does anybody know what this is? >> >>https://www.dropbox.com/s/np4s7ifgg5f4gbz/DSC01841.JPG?raw=1 >> >>https://www.dropbox.com/s/6ckipx3z8v4nf72/DSC01844.JPG?raw=1 >> >>Spark gap? Waveguide T/R switch? > >It is probably one of those fortune telling machines that you have to rotate and then you see the future in it. >google does not know that number, you should tell them.OK, you don't know. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Reply by ●September 13, 20182018-09-13
<698839253X6D445TD@nospam.org> wrote in news:pndu81$1l3q$1@gioia.aioe.org:> John Larkin wrote >>Does anybody know what this is? >> >>https://www.dropbox.com/s/np4s7ifgg5f4gbz/DSC01841.JPG?raw=1 >> >>https://www.dropbox.com/s/6ckipx3z8v4nf72/DSC01844.JPG?raw=1 >> >>Spark gap? Waveguide T/R switch? > > It is probably one of those fortune telling machines that you have to > rotate and then you see the future in it. google does not know that > number, you should tell them. >It is either a diode vacuum tube or a vacuum tube triode. Used in transmitter output sections.
Reply by ●September 13, 20182018-09-13
>John Larkin wrote >>>>>>But most CCROs are probably used as >>>>>>bandpass filters. >>>>>> >>>>>>http://www.mpdigest.com/2017/01/23/ceramic-resonator-band-pass-filter/ >>>>> >>>>> >>>>> >>>>>Yes of course, those ceramic filters, or should I say SAW filters, are everywhere, >>>>>for example in TVs as IF filter. >>> >>>>A CCRO is different from a SAW. And different from a mechanically >>>>resonant ceramic filter. I guess you knew that.What you probably meant by CCRO is a dielectric resonator based oscillator https://en.wikipedia.org/wiki/Dielectric_resonator The link you pointed to says ceramic-resonator-band-pass-filter CCRO filter stands for Closed Circuit Reverse Osmosis filter something entirely different. Yes dielectric resonators are the same as the 'pucks' in the picture I showed earlier: http://panteltje.com/pub/5_dollar_LNB_PCB_IMG_3582.GIF People can tune those (increase frequency) by removing something of the material. or add something to decrease frequency. Those are not very stable compared to a crystal controlled PLL.>>No, there is no motion. Each tube is a shorted coaxial transmission >>line. The dielectric constant of the ceramic is so high that the line >>is short relative to the round-trip frequency. In the filter, the CCRs >>are coupled somehow, classic multiple-resonator math.dielectric resonators! Anyways, now we know what we talk about.
Reply by ●September 13, 20182018-09-13
On Sep 13, 2018, John Larkin wrote (in article<ratkpdd8tm9gdtnqvmup0ip6rrjlmritjk@4ax.com>):> On Thu, 13 Sep 2018 01:32:15 -0700 (PDT), whit3rd<whit3rd@gmail.com> > wrote: > > > On Wednesday, September 12, 2018 at 8:04:55 PM UTC-7, bill....@ieee.org > > wrote: > > > On Thursday, September 13, 2018 at 6:09:16 AM UTC+10, John Larkin wrote: > > > > > > Spark gaps can be impressive! > > > > > > But erosive. And the glow-to-arc transition takes closer a microsecond > > > than a picosecond. > > > > Erosion is real; there's a molybdenum electrode with a few grams missing > > in my junk box. The platinum button in a spark plug, though, lasts quite a > > while > > with modest currents. Probably the metal ions just aren't part of that kind > > of arc. > > Does anybody know what this is? > > <https://www.dropbox.com/s/np4s7ifgg5f4gbz/DSC01841.JPG?raw=1> > > <https://www.dropbox.com/s/6ckipx3z8v4nf72/DSC01844.JPG?raw=1> > > Spark gap? Waveguide T/R switch?I’d say HV spark gap. It does not look like it world work as a T/R switch - wrong shape, although I suppose it could be between two pillars transverse to a rectangular waveguide (shorting the long walls). Joe Gwinn
