[NLRS] 10 G second weekend - K0KFC/LASER

Thu, 04 Sep 2003 11:49:41 -0400

Jim,
I have some laser info on my website that you may want to check out. 
 HeNe's are notoriously difficult to modulate--you are usually limited 
to failrly slow CW by keying the beam on and off through a chopper 
(fan).  If you use a laser pen you can just wire it up to a TTL 
oscillator--you'll probably find that the beam has a bit more 
divergance, which can be an aid in aiming over shorter distances...not 
to mention that it's much lighter and doesn't need HV.  I have a pair of 
the ramsey kits also, and they are lots of fun--I'm sure they are good 
for a tens of miles with good lenses, provided you can point them.

The RX that I put together per K3PGP's directions is extremely sensitive 
under dark conditions (I haven't had a chance to try the daylight 
version yet).  It doesn't really even need a lens until the path is over 
a couple miles--those lasers are *bright*.  I can just hear myself cloud 
reflections using a 3mw pointer and a 4" lens--I have some fresnels, but 
I need to figure out how I'm going to mount them.  

We're looking to try out some laser stuff here in the Rochester/NY area 
this second weekend also.

Andy K0SM/2

[email protected] wrote:

>There are some Fresnel lenses at ABC Electronics. 
>I think the cost is $15. The useful area is about 10' square.
>
>Another option is AEI, they have glass lenses that are 4"
>dia for $3.00.
>
>Who is ready to go with Laser equipment? What type do
>you have, Ramsey Kit or something else?  I have a Ramsey
>kit and two homebrew units that use a He-Ne with a chopper
>wheel to modulate the signal at 1kHz. The homebrew units
>are not compatible with the Ramsey units.
>
>73,  Gary  WB0LJC
>
>On Wed, 3 Sep 2003 21:02:14 -0500 "Jim Hermanek"
><[email protected]> writes:
>
>>Hi all.....
>>
>>I am planning to be out for the second 10 g weekend....Plans are not =
>>definite, but thinking of doing the Monti and Fletcher locations....   
>>=
>>This would be long path attempts down to Mel at the sites in the SE, =
>>plus the metro downtown, plus a shot at KM0T & N0DQS from each of the 
>>=
>>sites if theyt are going to be on....   Pretty opptimistic on my part 
>>=
>>with low power, but worth a try..... will also get out the WBFM....and 
>>=
>>perhaps gather at Mound Park?   (Whatever the group wants to do!)  =20
>>
>>Anyone know of a site (1000 meters) for an attempt at Laser toward =
>>twilight for better visibility?  Anyone know the exact distance from =
>>Mounds Park to the Capital overlook?  Again, some optimism here but 
>>fun =
>>to try...still haven't found any sort of fresnel lens to improve the =
>>possibility....
>>
>>73s    Jim     K0KFC
>>
>>
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