Ole,
What is the value of the "2E21" resistor?
Looks like a typo. 2k?
Feel inspired to rig up something for my FS700.
Will wooden frame my TP-cable wired to form a 8 turns times the cable-turns.
Cheers,
Magnus
On 07/16/2015 09:05 AM, Ole Stender Nielsen wrote:
I use a home-made untuned loop antenna with 4 windings of 2.5 mm2
insulated wire on a 80 x 80 cm wooden frame, and with a grounded base
pre-amplifier mounted on the antenna frame. A schematic is enclosed for
you to copy.
The pre-amplifier is powered through the cable, and loads the FS700
input as required.
I live about 290 km from the island of Sylt, and get nice noise margin
figures from the FS700, normally about 40 dB, often up to 46 dB.
For larger distances to the transmitter site, you may need to insert
additional amplification between the grounded base pre-amplifier and the
FS700, and that requires that you provide power to the pre-amplifier
through a bias Tee, and that you load the FS700 input to keep it happy.
A while after I installed the antenna in the attic, I added additional
amplification, not due to a low signal level, but because I wanted to
use the loop antenna for other longwave services too, and that required
that I had to split out the signal.
Best regards
Ole
Den 15-07-2015 kl. 18:02 skrev Dr. David Kirkby - Kirkby Microwave Ltd :
Does anyone know of the latest firmware for the Stanford Research
FS700 Loran-C frequency standard? I know someone who has one with
firmware 1.20, but I don't know if there's any later firmware. I
recall asking Stanford Research about firmware for the SR620 but got
no response, so I don't know if I will have any better luck with the
FS700.
What's the best sort of antenna for these? I know Stanford sell one,
and by the cost of new professional equipment, the $250 is not
abnormally high, but I'd rather look at building something if I
purchase one of these standards. I did think of using a half-wave
dipole, but my garden is just a wee bit too small.:-)
Dave
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