Partial Sovereign schematic

[PhilippeM]

Re: Better coil/pre-amp pictures

YEAHHH!!!!!!!!!
MANY Thanks DAVID.
What we can see is that the coil are not shield!
Thanks
PhilippeM

[David]

The coil is shielded

I have it folded over in the picture but if you notice the white wire is connected to a round paper disk the same size as the coil that is painted with a black conductive substance on one side. These conductive paper shields are on the top and bottom of the coil. The cable entry hole leaked on this coil and caused the shield wire to corrode apart and it caused all kinds of falsing, I wonder how many other people have this problem and don't realize it. When it happens you can not run the sensitivety very high. The center section that holds the coils and pre-amp is made of a dense yellow foam painted light brown.

[VBG]

Re: You raise a good point...no aftermarket coil preamps?

How is Transmiter curent/ voltage/ ? HH V.

[bbsailor]

Re: You raise a good point...no aftermarket coil preamps?

I believe the preamp is a voltage amplifier but the preamp also lowers the output impedance to isolate loading on the receve coil and to minimize noise pickup in the coil multi-conductor lead.

Look at the referenced schematic (in my post) to calculate the gain of the internal preamp by the ratio of input resistor to feedback resistor. I get a gain of 26.8.

If aftermarket coils have no internal preamps, then there must be a loss of that 26.8 gain in the amplification chain.

The only way that I can see some apparant gain being obtained without a preamp is to have a better or more critical coil balance than the stock Sovereign coil with the preamp. But this is only speculation on my part.

bbsailor

[Seaan Goddard]

The Sovereign doesn't use Coax for the cable, but 5 cores.

Two are 16 or 14 SWG (AWG) and the other three are 20 or 22 SWG. Using coax to isolate the Tx from the RX would probably help the sensitivity a little....Maybe?

[Golum]

Sovereign and Sovereign XS coil

Distinction of one from another that there is a multifrequency search (BBS) so should not stand the capasitor (.0.6) in a contour of thу TX coil in preamp

[Goodrat]

I'd like to see the audio output stage of this if you have.

This is an old post but perhaps you have more.