Fischer - Spider Coil Parameters

[Andrew]

Hello!

I'm looking for parameters of Fischer Spider coil (for 1235,1266),
because I want to build similar open center coil.
I must know electrical parameters especially resistance of TX, RX coils
Please send me info if you know this parameters - my e-mail adress is
andk@poczta.fm

[Reg]

Hi Andrew,

Fisher used to sell the schematics for their detectors and they did display the general coil parameters on the schematic. I am assuming they still do and what information is shown on the schematic is correct.

It appears from the schematic I have of the 1235, the xmit coil is 2.4 mh and the receive coil is 10.8 mh. Also, there is no indication of any capacitors mounted in the coil housing.

I cannot tell you the resistance nor the number of turns of either winding, but hopefully this information will help some. Unfortunately, I do not have a coil to measure to verify the above numbers or to provide any other information.