[time-nuts] Firmware and antenna for Stanford Research FS700 Loran C frequency standard

Magnus Danielson magnus at rubidium.dyndns.org
Thu Jul 16 12:27:14 EDT 2015


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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