Hi Gerhard,
Thank you! I haven't known that. The sensitivity of the SFH350V is maximal at
850nm. But at 650nm it is still 57% and thus also usable. But if one wants to
get "the perfect system" this might be a guess...
73! Stefan/DK7FC
PS: Nice signal in QRSS60 in the moment, well visible here. But the frequency
stability of my K2 is a desaster. That is one reason why i built my own RX that
will be supplied with the DDS-VFO...;-)
PPS: Before 2 h i hang up my ant for HF at the new QTH, a unsymmetric dipole,
fed with ladder line and a homemade symmetric tuner and a homemade 500W class E
PA. The first QSO this year on HF, 80m seems almost to be SHF for me, starting
with that 3... ;-) The first QSO was to OE5MSM, who seems to be a neighbor of
Ossi/OE5ODL. He said he has a loop with 350m and 35m up! And he is interested
in LF! So i told him much of LF and tried to motivate him. He is member of the
EHSC (>300bpm) and promised, that we will do a QRQ QSO on LF when he is QRV ;-)
I gave him the hint to start visiting the DF6NM grabber. Perhaps we will have
another strong stn here from OE?! :-) If you live in near of him, pse ask him
each day if he is QRV now ;-)
________________________________
Von: [email protected] im Auftrag von Gerhard Hickl
Gesendet: Do 11.02.2010 22:20
An: [email protected]
Betreff: Re: AW: LF: Fiber optic components
Hello Stefan !
850nm is visible too! It by far not that bright than "visible" light is,
but nevertheless, still visible.
850nm is the typical wavelength used for MultiMode Fiber Connections.
On a 50-62.5 Multimode-Fiber it usually can travel for up to one
kilometer (850m is the nominal distance).
The wavelength I am usually dealing with is 1310 or 1550nm (SDH and WDM
equipment).
So maybe you'll give the 850nm a try. I don't know if these components
are cheaper than the 600nm but visibility is not the problem.
Cheers
OE3GHB
Gerhard
Am Donnerstag, den 11.02.2010, 20:25 +0100 schrieb Stefan Schäfer:
> Hi Roelof,
>
> My hint is http://www.elpro.org/shop.php?p=SFH+757+V for the SFH757V
> (6,58EUR), which has the same wavelength (660nm) and less maximum forward
> current. But the forward voltage is higher and maximum current is enough, so
> perhaps even better than the SFH750, since the power at the same current, say
> 20mA, is higher. I know, 8XX nm could be better but i want to see the light
> coming into the shack...
>
> The SFH350V is available for 2,69 EUR there.
>
> 73 es vy gl es pse rprt of your success :-)
>
> Stefan/DK7FC
>
> ________________________________
>
> Von: [email protected] im Auftrag von Roelof Bakker
> Gesendet: Do 11.02.2010 19:06
> An: [email protected]
> Betreff: Re: LF: Fiber optic components
>
>
>
> Hello Tracey, Graham, Robert,
>
> Thank you all.
> Well, 21 pound is a bit stiff, me think.
> I am not that desperate yet.
>
> These items are advertised as low cost....
>
> I have also been looking for the components without the plastic housing.
> However these are also hard to find.
>
> I will look into it a bit further.
>
> 73,
> Roelof, pa0rdt
>
>
>
<<winmail.dat>>
|
