[Laser] led txr

[Ron Simpson]

Hello!!
 
Can you post the schematic of the transverter? I am collecting the parts to do the same thing only use a mini-circuits DBM. I bought serveral JIM-PAK 3.58 Mhz xtals, all of them are about 2 khz off freq. I think I need a better osc circuit that can be trimmed on Freq.
 
I am using 4 leds in a quad config with a 3 inch magnifing lens, and a flashlight reflector. I have a very bright image at 500 feet. I will be making improvements. I will just use the K3PGP modulator and reciever for now. May switch to Clints circuits later.

Ron Simpson,
N6GKJ Amateur Radio
...................

Have you ever noticed that when you are looking for something, 
it is always found in the last place you look?

--- On Mon, 11/8/10, I <stuart.wisher at talktalk.net> wrote:


From: I <stuart.wisher at talktalk.net>
Subject: [Laser] led txr
To: laser at mailman.qth.net
Date: Monday, November 8, 2010, 12:24 PM



First of all, to Des M0AYF:



i am in IO94CX, about 120 miles N of you. I have designed a transverter from 80m to produce and receive subcarriers for optical comms (see previous posts), it uses an MC1496 to mix a 3.58MHz xtal osc with rf around 3.605MHz to produce 25kHz SSB or FM and receive. The rx font end is a broadbanded RC coupled version of Clints (KA7OEI) wonderful receiver. The tx  LED is driven and biassed from the transverter at up to 1A current. It uses a golden dragon red LED RS part 665-6189. I use my FT817 as driver, on its half watt setting. Hopefully the design will be in RadCom in the new year.


I have also designed a LED transceiver using the same LED on tx and rx, also to be in RadCom. All this by following links from Tims excellent website (and a bit of experimenting). We worked 65km last week with end stopping signals.


Sorry, no website!


we may be out again next weekend to attempt 82km, NE England to N Yorks moors, weather permitting.


I have completed the construction of my extreme beacon using a 20W LED and 100mm lens to produce a 2 degree beam, modulated at 2.5Hz for visual recognition or 25kHz for reception peaking using transverter. Seeing a strobe over 65km enabled us to line up last week.


We used a smaller beacon to test rx sensitivity, 5mm LED driven from a 555 timer at 25kHz is audible from up to 1 km with no lens on tx.


Stuart, G8CYW
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