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

[Ole Stender Nielsen]

Hi Magnus,

The 2E21 is a 2.21 Ohms resistor.
The RC network was found useful to ensure loading at higher frequencies.
Best regards
Ole

Den 16-07-2015 kl. 18:27 skrev Magnus Danielson:
> 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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>>
>>
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