[Laser] Filters for red 650nm lasers wb6igp

[Buchanan Bill]

Chuck

Kerry banke mentioned that you might be a source for a
few microwave diodes to get our 47ghz harmonic mixers
going....if so let me know as we are working on the
24ghz system and therefore have the LO etc that we
would need...

73

Bill
WB4WEN
--- Chuck Houghton <clhough at pacbell.net> wrote:
> Conc filters for 650nm lasers I have narrow band
> dichromic glass filters cut
> to accommodate a simple cover for the photodetector
> diode, These are small
> pieces of glass cut from a large glass plate. We
> have successfully used them
> with inexpensive pointing lasers that were tested to
> be operational at 650
> Nm. WE BOUGHT MANY $2 LASERS AND REJECTED THOSE THAT
> WERE NOT 650 N.M.
> operational. Testing was done with a simple
> spectrometer available from
> Astronomical Society of the Pacific (Project Star)
> For $28 (2002 cost)
> www.astrosociety.org for info. The glass filters we
> used were installed over
> the photodetectors of both Kerry N6IZW and mine
> WB6IGP's photo detector and
> in full sunlight we made a 1KM full duplex contact
> with over 70 db margin
> using our home built systems. Voice operation was
> done with 5 Khz deviation
> narrow band fm converting received 40 Khz carrier
> and converting it up to
> 145.040 Mhz for reception on a 2 meter FM HT.
> Quality of the FM was
> excellent and connecting our lap top computers sound
> card to rx and TX QSL
> cards were sent back and forth. It works! For more
> info email me off
> reflector directly. best 73 chuck WB6IGP
> 
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