Kapanadze and other FE discussion

[gyulasun]

was made by me, it does not work like an oscillator. and can not work, the direct current is broken.

There are only ferrite rods.
But what is (positive dc input)?
if there is no way for it. is a capacitor in the path?

this circled in red. if it were not there, a cascade with a common base would result.

Hi kolbacict,
I have edited the schematic you uploaded, at least to make the circuit work as a kind of blocking oscillator. 
I agree that the original schematic cannot work: "the direct current (to the emitter) is broken" as you said.
If you attempt to build this modified schematic, and you are not getting any pulse at the output where it is indicated originally, flip the ends of either the feed back coil to the base or the main coil at the collector, ok? (i.e. only the wires of any one of the coils) 

For your information: 
--the positive DC input is the supply voltage input with respect to the ground (which is the negative polarity),
--try to use a variable power supply, starting from a few volts to as high as 12 or 15 V, to find the best operating point for the oscillator, this also depends on your transistor specifications--the indicated output is via a coupling capacitor from the collector of the transistor, use here a capacitor whose capacitive reactance is but a few Ohms at the pulse frequency

I do not know where you can get a "negative magnetorestrictive rod" though... and I do not think its high price (if true) is worth the trouble to purchase such.

Gyula

[stivep]

gyulasun I do thank you very much  for your contribution
good work
======================================

I think application is a part of the problem:
https://fas.org/man/dod-101/navy/docs/es310/asw_sys/asw_sys.htm
Figure 17. Bi-static sonar.
Material must be as listed in green color.
the system acts as  mechanical transducer
look at link below and the lower picture _{marked as figure1 system Block diagram}
https://www.ijert.org/research/sonar-fish-detection-and-measurement-system-with-pic16f873-IJERTV4IS060453.pdf

So the unfortunate was that  book http://www.free-energy-info.com/Smith.pdf
was trying to refer to something that was  wrongly  explained.
but the idea is quite fascinating.
If you compare Tx configuration  _{from the lower picture} and Rx configuration, it looks like both  use transducer .
and Smith assumption is that process of receiving is just reverse action  .

_{Note: I should  make schematic more easy to understand
but let it stay this way for now.
All that is important is to make Base able to open  emitter/collector junction  at first.
Than you can chose what you want to send  between collector and emitter.
And for how long. There is no output in the schematic.
So you can exclude this part.
The amplification can be done from the same + impulse.
but if you want to have train  of impulses send than you can use terminal marked output as external impulse delivery.
Would that be as long as  saturation of the capacitor?
-or you want to  cut  power to Base before that.}
Wesley
literature: https://www.youtube.com/watch?v=WaHD7665NeM

[stivep]

 

Wesley

[mkjekyll]

Wesley perhaps I am a bot off topic now but a very solid RF guy turned me onto this VNA, looks interesting have to find out more such as is tracking gen limited like in the Chinese box.

https://www.arraysolutions.com/antenna-analyzers%20/vna-uhf-dx

Looks as though the coupler is inside the unit similar to many antenna analyzers, I do not know the downside of this config.

I don't participate on these forums much but have watched presentations and I highly respect the stuff Tinselkoala presents, thank you for participating in Wesleys tech circus!

Mick

[mkjekyll]

$1300 I think,  they have a single port unit for about $500.   The frequency response looks good but so did the Siglent until one gets to the lowside of the tracking gen which did not match lowside of the spectrum analyzer.  Not o mention the crazy software pricing.

Still looking for a you tube or video of performance.  Likely CPU-Ram related if code is not bloated DLL files that choke the puter.

The pci card unit you mentioned did not go low enough and the HP Vxi card unit that does go low enough

https://www.ebay.com/itm/HP-Agilent-89640A-VXI-Based-2-7-GHz-RF-Vector-Signal-Analyzer-PRICE-DROP/232488518625?hash=item36216543e1:g:PBkAAOSwo-RZuuSv

https://www.keysight.com/us/en/software/application-sw/89600-vsa-software.html#Bundles

the software is very costly and may not have the scattering or smith charting.  I cant find the software free from Keysite except the 30day trial  Maybe I should sell the HP 89411 I got working and get the little computer based one, lower S/N ratio but more functionality.  Although that HP can go super low so may be worth hanging onto even without the S parameters.

Most of the cheap puter ones do not work below a few hundred MHz so I think the unit I posted is different in that it is based on a lower freq unit and uses freq multiplication for higher frequencies, this would explain the lower dynamic range on the higher frequencies.