Hi Andy,
My playing with IGSL and many other things is in a slow pace at this time, but I maintain my own list of things that I done, and things I wish to try.
Of all the changes I'd put "pin swap" as the most important of all. It makes the Fe channel work as it should.
I also noticed some stability issues that I'm not certain where they originate, but I have some suspicions. I guess the GB potentiometer and its neighbourhood are the culprit as the impedance there is high, and there is a minor issue of crosstalk between the comparators within the same chip. My guess is that all instability will go if, say, 10x lower impedance is introduced there.
I'm planning to turn my IGSL into a beach combing monster by (ab)using the fact that there is a channel to spare. There are 2 GB channels, and I already use only one. The other one will be used as all metal reference, and it will enable GB to adjust to any value between ferrites and wet salts. Without all metal reference this kind of detectors go bezerk on difficult grounds.
I also plan to try a simple novel Rx front end topology that would allow for operation at a lower input impedance and around resonance. Simulations say it should work fine, but real life must prove it first.
The last thing I did was AB->C class modification to Tx which results in less power consumption at Tx with a marginal improvement to signal purity.
Unfortunately I have some other more important thing to do, and my visits to my shack/lab only become less frequent.
My playing with IGSL and many other things is in a slow pace at this time, but I maintain my own list of things that I done, and things I wish to try.
Of all the changes I'd put "pin swap" as the most important of all. It makes the Fe channel work as it should.
I also noticed some stability issues that I'm not certain where they originate, but I have some suspicions. I guess the GB potentiometer and its neighbourhood are the culprit as the impedance there is high, and there is a minor issue of crosstalk between the comparators within the same chip. My guess is that all instability will go if, say, 10x lower impedance is introduced there.
I'm planning to turn my IGSL into a beach combing monster by (ab)using the fact that there is a channel to spare. There are 2 GB channels, and I already use only one. The other one will be used as all metal reference, and it will enable GB to adjust to any value between ferrites and wet salts. Without all metal reference this kind of detectors go bezerk on difficult grounds.
I also plan to try a simple novel Rx front end topology that would allow for operation at a lower input impedance and around resonance. Simulations say it should work fine, but real life must prove it first.
The last thing I did was AB->C class modification to Tx which results in less power consumption at Tx with a marginal improvement to signal purity.
Unfortunately I have some other more important thing to do, and my visits to my shack/lab only become less frequent.
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