ZOn 15 Jul 2015 22:18, "Poul-Henning Kamp" <[email protected]> wrote: > > -------- > David Kirkby - Kirkby > Microwave Ltd " writes: > > >What's the best sort of antenna for these? > > I use a $20 loop antenna I have rigged up myself, it lives in my attic: > > http://phk.freebsd.dk/loran-c/Antenna/
Hi, Thank you for that. But it is a bit short of information. I appreciate your use of "the nearest bent nail" principles, but roughly how many turns were there on the coil? Do you have a circuit for the amplifier? The AD797 data sheet you link to is broken, but the error message is quite funny. I found the data sheet on the AD797 and see it is a very low noise op-amp. I must admit to knowing next to nothing about antennas at the Loran 100 kHz (+/- a lot) frequency. How does one go about testing the antennas? I'm about to place an order for an FS700, but will not have an antenna when it arrives. I have a short period of right of return, and I'd like to get something in place so I can quickly test this. I have an HP 4284A precision LCR meter which works at more than 8000 discrete frequencies between 20 Hz & 1 MHz. Those frequencies include 60, 80, 100, 120 and 150 kHz. That's the only thing I have got that measures impedance as low as 100 kHz. There's a description of the active antenna for the FS700 in the manual, but with no circuit diagram, it is a bit tricky to understand. I assume that the FS700 has some sort of bias-T to pass DC up the cable to power the amplifier - is that so? If so, do you know the voltage? No doubt all these things will be revealed when I get the FS700, but I'd like to be ready to test it when it arrives. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
