good generator tx for the vlf

[Gene L.]

Looks great!thank-you Sevzirfo.Let us know about power supply,Receive section ,coil data"optimized". Also do you have any more information on "volksturm",and what are the I.C. #s/cross reference?? KA561?? Thank-you Gene L.

[sevzirfo]

powerful generator tx




Hi, Gene L

KT561LA7 - CD4011

Look my new generator TX...

[Gene L.]

Re: powerful generator tx

SEVZIRFO!! Thank-you , Your circuits are all "Great". Have a Very good day, and keep in touch more with this forum. Gene Lemke in USA.

[Dr.Mabuzu]

Re: powerful generator tx

Òîëüêî òðàíçèñòîðû äîëæíû áûòü íå
êò315/361,ó íèõ
âûñîêîå ñîïðîòèâëåíèå ýìèòòåðà,
íàäî ñòàâèòü ÊÒ817/816
(èëè ÊÒ502/503)

[David]

Re: powerful generator tx

Now you are getting there. How about using power Mosfets with an on resistance of less than 1 ohm instead of the bipolars and raise the capacitor value, then lower the inductance to obtain lower reactance values for more current flow through the coil. Use the high mahr NiMH cells. Have you actualy compared the results of the higher powered transmitter to the lower powered ones for depth. The H bridge output seems to do a great job on the ML Sovereign but I have heard other people with lower opinions on increased power.

[Sean Goddard]

Re: powerful generator tx

Overdo the Tx power on a VLF detectors and you'll sturate the ground matrix. this leads to a loverly bucket load of signal coming back from the ground itself which will swamp the front and and reduce senitivity as the signal gets lost in the resultant "mush".

The trick is to find the right balance. A continuously variable sustem is what's needed, that way you can tweak it so suit the ground conditions of the site you are working on.

Instead of an inverter, use a transistor phase splitter, and drive the Tx amp from a VCA controlled by a PIC. You can then program the PIC to look at the stability of the detector and crank up the Tx power AND the Rx gain to get the optimum balance. It's quite easy to do, and providing you are handy with DigiPot's and PIC micros.

[David]

Re: powerful generator tx

You are messing up my deep fantasy.