[Laser] Field Day 2004

[aflowers@frontiernet.net]

You can modulate laser diodes up into the GHZ region, but the PGP
front-end will have BW limited depending upon how the PD is
biased--"daytime version" should have a larger BW.  I know the W6's
have been using 2m FM handhelds as the subcarrier--that would be very
cool if you could hook that up at FD-hams could hook up their own "IF"
and talk.  I think G0MRF said he had managed to put baseband audio, LF,
and HF all on the same diode and demodulated at the other end. Baseband
video is another interesting possibility for Field Day.

FWIW, I brought my ramsey kits to the W2RDX FD site last summer, and it
was a big hit with everyone, including the born and raised HFers.  I
might suggest that you set it up and pre-align everything.  If you have
along of realestate, try to get them out of ear-shot range.  I just
finished "hot rodding" my ramsey kits so that the RX and laser are
separate from the main board.  It seems silly to me to put all the
switches with the laser since you can adjust anything without knocking
it off of alignment!

Andy K0SM


Quoting riese-k3djc@juno.com:

>
> Using the K3PGP front end fed into a LF rcvr you can copy the
> Sub Carrier along with the tone or audio from the Ramsey TX.
>
> I see many signals and use the one at 14 Khz. You end up converting
> Light to RF which will impress a lot of hams as well... Your
> converting
> lite to RF
>
> I didnt check to see How much output the Ramsey detector
> would generate on LF but when pointing the PGP detc toward the Puter
> monitor I can see RF up through several 100 Khc .
>
> I put a Phono Plug at the Ramsey rcv and have the supplied Diode in a
> Phono plug
> this allows for changing detector
>
> lots of fun
>
> Bob  K3DJC
>
>
>
>
>
> On Wed, 7 Jan 2004 21:04:44 EST TWOSIG@aol.com writes:
> > Our amateur radio club is starting to plan for Field Day 2004, and
> I
> > am
> > planning to set up a laser communications station (it is worth a
> > voice contact, a
> > CW contact, and a digital contact, plus a 100 point bonus if we use
> > a
> > non-traditional mode (like pulse width modulation).
> >
> > I was wondering if others are planning Field Day operations ( and
> if
> > you are
> > not, at least get you to think about it).  It should be an
> > interesting display
> > for the public, even if you just set up some LEDs to demonstrate
> the
> > concept
> > at 10 to 20 feet range.  Lets let the world know how much fun it is
> > to talk on
> > a light beam!
> >
> > If anybody knows, does MCW count as CW or Digital under the field
> > day rules.
> >  If it is classed as CW, I will try PSK  or something else for the
> > digital
> > mode.  If it is classed as digital, then I will set up a keyed
> Morse
> > laser
> > transmitter that is not pulse modulated and a receiver for it.
> > Anyone done this
> > before?
> >
> > James
> > N5GUI
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