Bounty Hunter Outlaw TR/BFO

BFO is a single coil, I assure you we know how those work. LOL!

Yours works with the single small coil.   Your BFO section is whole.

The TR section is messed up.   Coil is suspected Bad.

Basic TR Detector.

In your case, I suspect there using the LO Locale Oscillator used for the Reference in the BFO section for the TX on your TR mode.

It seems you have Two RX coils.

I believe there using them 180 out of phase to null the RX signal.  No Out put signal from the TX coil.

Targets detected would disturb the Balance of Null either Positive Phase or Negative Phase.  Lead or Large in phase from the LO signal.

In TR mode it's using a Indipendent RX section to Detect.

Look in here: 

You are not allowed to view links.
Please Register or Login

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,25706.msg180847.html#msg180847

I'll make the measurements and get back to you on that.

Otherwise, yes.. the 6" coil can be used in BFO -and- TR mode.

I gave the BFO schematic and link to illustrate that the coil design uses the Faraday shield. In my setup I have two coils in one housing. I don't know why they call it a triple coil. They have a common ground.

Thanks again!

Big-Al

Posted on: June 09, 2011, 12:15:01 PM

---

Well, I checked the connections with a Digital Voltmeter. Here are the results.

Connector                              Coil Termination
                                            Left conductor          Right conductor

Pin 3                                       1.3 ohms                5.9 ohms
Pin 4                                       1.2 ohms                1.6 ohms
Ground Shield                           2.5 ohms                3.8 ohms

Measurement between pin 3 & 4 = 6.5 ohms

Note: Unless I'm not seeing something these results seem inconclusive. The readings are so similar that I can't tell which pin is connected to which conductor. Could  this indicate there is a short? Otherwise, it would seem logical to sever the cable on the coil end and test the cable that way for shorts. .. ?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,25706.msg181516.html#msg181516

I checked the connections on the questionable coil with a Digital Voltmeter. Here are the results.

Connector                              Coil Termination
                                            Left conductor          Right conductor

Pin 3                                       1.3 ohms                5.9 ohms
Pin 4                                       1.2 ohms                1.6 ohms
Ground Shield                           2.5 ohms                3.8 ohms

Measurement between pin 3 & 4 = 6.5 ohms

Note: Unless I'm not seeing something these results seem inconclusive. The readings are so similar that I can't tell which pin is connected to which conductor. Could  this indicate there is a short? Otherwise, it would seem logical to sever the cable on the coil end and test the cable that way for shorts. .. ?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,25706.msg181521.html#msg181521

You must be getting very tired of all the questions with no answers forthcoming so I'll tell you why the questions are important to solving this.

It looks as if you have three wires only. One is ground which is connected to the shield (braided wire) of the cable and to the Faraday shield. One side of each coil or coil pair is probably connected to that shield as well. The other end of one coil is probably connected to one white wire while the opposite end of the other two coils which are phase shift configured is connected to the other white wire.

The single coil is most likely the transmitter coil and the two other coils phase shifted are the receiver coils.

I would like you to measure from the ground or shield to each white wire in turn. One of them will most likely be twice the resistance of the other. That will confirm my suspicion that they are wound as I believe they are. Before you do that, short the leads on your multimeter and adjust the meter to have them read as close to zero ohms as possible. Once you do that, do your measurements and let me know what you find.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,25706.msg181794.html#msg181794

That all sounds exactly right down at the coil end of the assembly. Now we need to see the same measurements at the connector end plus one ohm or so.

By the way, you did refer to your meter as a VOM in one of the earlier posts. Forgive me for making the error of assuming you were using one.

If you verify that the wires are all connected at the end nearest to the detector, then the problem may be inside of your machine. I said it MAY BE because there's always the chance that the impedance of the coils has changed over time with the breakdown of insulation and etc. One step at a time.

What state do you live in?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,25706.msg181818.html#msg181818